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Article ; Online: Reducing aneurysm sac growth and secondary interventions following endovascular abdominal aortic aneurysm repair by preemptive coil embolization of the inferior mesenteric artery and lumbar arteries.

Chew, David K / Schmelter, Ryan A / Tran, Maianh T / Franko, Jan

2023 Volume 79, Issue 3, Page(s) 532–539

Abstract: Objective: Type II endoleak (EL-2) is the most common complication following endovascular aneurysm repair (EVAR), leading to continued sac growth and potential rupture. In this study, we examined the association between patency of the inferior ... ...

Abstract	Objective: Type II endoleak (EL-2) is the most common complication following endovascular aneurysm repair (EVAR), leading to continued sac growth and potential rupture. In this study, we examined the association between patency of the inferior mesenteric artery (IMA) and lumbar arteries (LAs) with respect to sac growth. The effect of preemptive embolization of the IMA and/or LAs on the need for secondary interventions for sac growth post-EVAR was also evaluated. Methods: A retrospective cohort study was performed on consecutive patients who underwent EVAR for non-ruptured, infrarenal abdominal aortic aneurysms (AAAs) from January 2012 to December 2020. A select group of patients underwent preemptive embolization of the IMA and/or LA. Patients with any types I, III, or IV endoleaks were excluded. Patency of the IMA and LA on preoperative computed tomography angiogram (CTA) was evaluated on TeraRecon workstation. All secondary interventions to treat EL-2 were recorded. Sac growth was defined as centerline axial diameter increase of ≥5 mm on follow-up CTA. Results: A total of 300 patients (mean age, 74 ± 8.5 years; 83.7% male) underwent EVAR. Ninety-nine patients had preemptive embolization of the IMA and/or LA. Mean follow-up of the cohort was 59.3 ± 30.5 months. Thirty-six patients (12%) demonstrated sac growth on follow-up; 12 of these (33.3%) had preemptive embolization. The median time until detection of sac growth was 28.8 months (interquartile range, 15.2-46.5 months), with a mean growth of 10.1 ± 6.4 mm. Sac growth was significantly associated with presence of EL-2: 27 of 36 (75%) with EL-2 vs 9 of 36 (25%) without EL-2 (P < .001). Patients with sac growth had a higher mean total number (2.6 ± 1.5) of patent lower LAs (L3, L4) compared with those without (2.0 ± 1.4; P = .03). Patency of L1, L2, and L3 LAs were not associated with sac growth. However, patency of at least one L4 LA was significantly associated with sac growth (14.8% vs 7.7%; P = .04). The highest incidence of sac growth (17.6%) was seen when both IMA and L4 LA were patent; significantly different from the lowest incidence (5.3%) when both were occluded preoperatively (P = .018). Preemptive coiling of the IMA and/or LA significantly reduced the need for post-EVAR secondary intervention for sac growth. Freedom from post-EVAR secondary intervention was achieved in 92 of 99 (92.9%) pre-EVAR coiled patients vs 163 of 201 (81.5%) patients who did not undergo pre-EVAR coiling (P = .009). Conclusions: Preemptive coil embolization of the IMA and LAs, especially L4 LA, reduces the need for secondary interventions for sac growth, potentially improving the long-term durability of EVAR.
MeSH term(s)	Humans ; Male ; Aged ; Aged, 80 and over ; Female ; Mesenteric Artery, Inferior/diagnostic imaging ; Mesenteric Artery, Inferior/surgery ; Aortic Aneurysm, Abdominal/diagnostic imaging ; Aortic Aneurysm, Abdominal/surgery ; Aortic Aneurysm, Abdominal/complications ; Retrospective Studies ; Blood Vessel Prosthesis Implantation/adverse effects ; Blood Vessel Prosthesis Implantation/methods ; Endovascular Procedures/adverse effects ; Endovascular Procedures/methods ; Endoleak/diagnostic imaging ; Endoleak/etiology ; Endoleak/therapy
Language	English
Publishing date	2023-11-24
Publishing country	United States
Document type	Journal Article
ZDB-ID	605700-7
ISSN	1097-6809 ; 0741-5214
ISSN (online)	1097-6809
ISSN	0741-5214
DOI	10.1016/j.jvs.2023.11.031
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Article ; Online: The influence of Cenozoic Eurasia-Arabia convergence on the Southeast Arabian Foreland Basin: new geochronological and geochemical constraints from syn-kinematic carbonate mineralization.

Arboit, Francesco / Drost, Kerstin / Decarlis, Alessandro / Chew, David / Hennhoefer, Dominik / Ceriani, Andrea

Scientific reports

2023 Volume 13, Issue 1, Page(s) 4387

Abstract: The Cenozoic succession of the Jabal Hafeet anticline yields the most complete surface expression of the deformation that affected the Southeast Arabian Foreland Basin (SEAFB). The carbonate rocks of the Eocene Rus Formation comprise the core of the ... ...

Abstract	The Cenozoic succession of the Jabal Hafeet anticline yields the most complete surface expression of the deformation that affected the Southeast Arabian Foreland Basin (SEAFB). The carbonate rocks of the Eocene Rus Formation comprise the core of the Jabal Hafeet anticline and host a network of fractures and carbonate veins associated with dynamic fracture opening and sealing events. These fracture networks developed during the propagation of compressional stresses from the Makran and Zagros fold-and-thrust belts into their foreland basin system (the SEAFB) and are associated with Arabia-Eurasia convergence. Syn-kinematic calcite veins associated with the Cenozoic folding events in the SEAFB were dated by U-Pb LA-ICP-MS carbonate geochronology and characterized further by Raman fluid-inclusion geochemistry. The U-Pb data show that Cenozoic compression linked to the propagation of the Makran fold-and-thrust belt into the SEAFB took place from c. 20 Ma (early Miocene) to c. 2 Ma (mid Pleistocene). Raman fluid-inclusion data reveal the presence of complex hydrocarbons within the parent carbonate-bearing fluids, reflecting a fluid transport pathway between the upper Cenozoic rocks and deeper hydrocarbon-bearing Mesozoic sequences. Combined isotopic and geochemical datasets show that the deformational history of the SEAFB is likely related to the reactivation of inherited deep-seated structures in the upper Cenozoic stratigraphic sequence due to the far-field stress propagation from the Makran belt into the Arabian peninsula, rather than the propagation of a thin-skinned deformation architecture.
Language	English
Publishing date	2023-03-16
Publishing country	England
Document type	Journal Article
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-023-31611-x
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Article: Coil embolization of an acutely expanding spontaneous splenic artery dissection.

Ebaugh, James L / Chew, David K

Journal of vascular surgery cases and innovative techniques

2018 Volume 4, Issue 2, Page(s) 144–146

Abstract: Symptomatic dilation of a spontaneous splenic artery dissection is a very rare and potentially catastrophic nonatherosclerotic vascular disease. Splenic artery rupture has not been reported after acute diffuse dilation, but it has been reported with ... ...

Abstract	Symptomatic dilation of a spontaneous splenic artery dissection is a very rare and potentially catastrophic nonatherosclerotic vascular disease. Splenic artery rupture has not been reported after acute diffuse dilation, but it has been reported with celiac artery dissections. We believe treatment is mandatory if pain persists despite blood pressure control. The presentation and endovascular treatment of a spontaneous celiac trunk dissection with continued expansion of the splenic artery branch are discussed.
Language	English
Publishing date	2018-04-27
Publishing country	United States
Document type	Case Reports
ISSN	2468-4287
ISSN	2468-4287
DOI	10.1016/j.jvscit.2018.01.010
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Article ; Online: Constraining the tectonic evolution of rifted continental margins by U-Pb calcite dating.

Hestnes, Åse / Drost, Kerstin / Sømme, Tor O / Gasser, Deta / Scheiber, Thomas / Linge, Henriette / Chew, David / Jacobs, Joachim

Scientific reports

2023 Volume 13, Issue 1, Page(s) 7876

Abstract: We employ U-Pb calcite dating of structurally-controlled fracture fills within crystalline Caledonian basement in western Norway to reveal subtle large-scale tectonic events that affected this rifted continental margin. The ages (15 in total) fall into ... ...

Abstract	We employ U-Pb calcite dating of structurally-controlled fracture fills within crystalline Caledonian basement in western Norway to reveal subtle large-scale tectonic events that affected this rifted continental margin. The ages (15 in total) fall into four distinct groups with ages mainly ranging from latest Cretaceous to Pleistocene. (1) The three oldest (Triassic-Jurassic) ages refine the complex faulting history of a reactivated fault strand originated from the Caledonian collapse and broadly correlate with known rifting events offshore. (2) Two ages of ca. 90-80 Ma relate to lithospheric stretching and normal fault reactivation of a major ENE-WSW trending late Caledonian shear zone. (3) We correlate five ages between ca. 70 and 60 Ma with far-field effects and dynamic uplift related to the proto-Iceland mantle plume, the effect and extent of which is highly debated. (4) The five youngest ages (< 50 Ma) from distinct NE-SW trending faults are interpreted to represent several episodes of post-breakup fracture dilation, indicating a long-lived Cenozoic deformation history. Our new U-Pb data combined with structural and isotopic data show that much larger tracts of the uplifted continental margin of western Norway have been affected by far-field tectonic stresses than previously anticipated, with deformation continuing into the late Cenozoic.
Language	English
Publishing date	2023-05-15
Publishing country	England
Document type	Journal Article
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-023-34649-z
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Article ; Online: Ice volume variations and provenance trends in the Oligocene-early Miocene glaciomarine sediments of the Central Ross Sea, Antarctica (DSDP Site 270)

Olivetti, Valerio / Balestrieri, Maria Laura / Chew, David / Zurli, Luca / Zattin, Massimiliano / Pace, Donato / Drakou, Foteini / Cornamusini, Gianluca / Perotti, Matteo

Global and Planetary Change. 2023 Feb., v. 221 p.104042-

2023

Abstract: Since the early Oligocene, the descent into global colder conditions has led to the stepwise growth of the Antarctic Ice Sheets. However, ocean and air temperatures were not sufficiently cold enough to maintain a large and stable continental ice sheet ... ...

Abstract	Since the early Oligocene, the descent into global colder conditions has led to the stepwise growth of the Antarctic Ice Sheets. However, ocean and air temperatures were not sufficiently cold enough to maintain a large and stable continental ice sheet and associated marine ice shelf, and therefore during the Oligocene to Miocene the glaciation waxed and waned. However there is limited geological evidence for the extent of these early glacial episodes. Here we present a multi-proxy single-grain provenance study on the glaciomarine sediments in DSDP Site 270, from the Central High in the central Ross Sea to determine the extent of such ice volume variations. The Ross Sea embayment is a key region in Antarctica for preserving geological evidence on the early glacial events, because glaciation was synchronous with continuous sea-floor subsidence and uplift of the surrounding mountain ranges. The Central High in the central Ross Sea was drilled by the DSDP project in the 1970s (Site 270) and a sequence of c. 400 m of Oligocene to lower Miocene glaciomarine sediments was recovered, underlain by a few meters of granitic talus breccia and gneissic basement rocks. The sediments evolve from a non-glacial, continental environment to a glaciomarine environment characterized by variable ice-rafted debris content and several diamictite units. Our approach combines information on crystallization ages in the source region (U-Pb detrital zircon dating), medium- and low-temperature thermochronology constraints (detrital apatite U-Pb and fission-track dating on the same grains), information on the source bedrock type (detrital apatite trace element analysis) and petrological analysis of gravel-size clasts. We provide new constraints on the ice sheet evolution since the earliest phases of glaciation, and show a transition from local to regional-scale ice sheets in the central Ross Sea region in the late Oligocene and early Miocene. In addition, our data can identify the source of sediment transported by ice streams to the central Ross Sea from different areas in the Transantarctic Mountains (TAM) and within the West Antarctic Rift System (WARS). In particular, the provenance data show the late Oligocene diamictite strata were sourced from a distant region, likely southern West Antarctica, indicating a substantial continental ice sheet already existed in the late Oligocene. These new data provide robust geological constraints for modeling of ice sheet volumes and ice drainage patterns in the late Oligocene-early Miocene.
Keywords	Miocene epoch ; Oligocene epoch ; air ; apatite ; bedrock ; cold ; crystallization ; drainage ; evolution ; glaciation ; ice ; ice shelf ; provenance ; sediments ; subsidence ; talus ; thermochronology ; trace elements ; zircon ; Antarctic region ; Antarctica ; Provenance analysis ; Apatite and zircon U-Pb dating ; Ice-sheet evolution ; Late Oligocene glacial event ; DSDP Site 270
Language	English
Dates of publication	2023-02
Publishing place	Elsevier B.V.
Document type	Article ; Online
ZDB-ID	2016967-X
ISSN	0921-8181
ISSN	0921-8181
DOI	10.1016/j.gloplacha.2023.104042
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Article ; Online: The Effect of Abdominal Aortic Aneurysm Size on Endoleak, Secondary Intervention and Overall Survival Following Endovascular Aortic Aneurysm Repair.

Ferrel, Benjamin / Patel, Shiv / Castillo, Antonio / Gryn, Oscar / Franko, Jan / Chew, David

Vascular and endovascular surgery

2021 Volume 55, Issue 5, Page(s) 467–474

Abstract: Objective: The purpose of this study was to identify the effect of abdominal aortic aneurysm (AAA) size on endoleak development and secondary intervention after endovascular repair (EVAR), as well as to examine the effect on overall survival and cause ... ...

Abstract	Objective: The purpose of this study was to identify the effect of abdominal aortic aneurysm (AAA) size on endoleak development and secondary intervention after endovascular repair (EVAR), as well as to examine the effect on overall survival and cause of mortality. Methods: Retrospective analysis was performed on all non-ruptured AAA treated by elective EVAR using FDA-approved endografts in our facility from July 2004 to December 2017. Patients were grouped into 3 cohorts based on preoperative aneurysm size: Group I (<5.5 cm), Group II (5.5-6.4 cm), and Group III (≥ 6.5 cm). Occurrences of endoleak, secondary intervention and overall survival underwent univariate and multivariate analysis. Cause of death data on deceased patients was similarly examined. Results: A total of 517 patients were analyzed. There was no difference between size groups in the rate of endoleak (Group I 48/277, 17.3%; Group II 33/160, 20.6%; Group III 18/80, 22.5%; p = 0.46) or time until endoleak development. Univariate analysis showed no difference in the rate of secondary intervention (Group I 36/277, 13.0%; Group II 24/160, 15.0%; Group III 18/80, 22.5%; p = 0.11), time until intervention or number of interventions performed. Multivariate analysis showed an association with shorter time to secondary intervention for both Group III aneurysms (HR 2.03, 95% CI 1.11-3.73; p = 0.02) and female patients (HR 1.79, 95% CI 1.02-3.13; p = 0.04). There was no difference in overall survival, aneurysm-related mortality or overall cause of mortality. Conclusion: AAA diameter prior to EVAR was not associated with any differences in rates of endoleak or secondary intervention, and was not associated with poorer overall survival or greater aneurysm-related mortality. Patients with suitable anatomy for EVAR can be considered for this intervention without concern for increased complications or poorer outcomes related to large aneurysm diameter alone.
MeSH term(s)	Aged ; Aged, 80 and over ; Aortic Aneurysm, Abdominal/diagnostic imaging ; Aortic Aneurysm, Abdominal/mortality ; Aortic Aneurysm, Abdominal/surgery ; Blood Vessel Prosthesis Implantation/adverse effects ; Blood Vessel Prosthesis Implantation/mortality ; Endoleak/etiology ; Endoleak/mortality ; Endoleak/therapy ; Endovascular Procedures/adverse effects ; Endovascular Procedures/mortality ; Female ; Humans ; Male ; Retreatment ; Retrospective Studies ; Risk Assessment ; Risk Factors ; Time Factors ; Treatment Outcome
Language	English
Publishing date	2021-03-15
Publishing country	United States
Document type	Journal Article
ZDB-ID	2076272-0
ISSN	1938-9116 ; 1538-5744
ISSN (online)	1938-9116
ISSN	1538-5744
DOI	10.1177/15385744211000572
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Article: Sourcing the sand: Accessory mineral fertility, analytical and other biases in detrital U-Pb provenance analysis

Chew, David / Caracciolo, Luca / Mark, Chris / O’Sullivan, Gary / Tyrrell, Shane

Earth-science reviews. 2020 Mar., v. 202

2020

Abstract: Interpreting the wealth of new data derived from the diverse suite of modern single-grain provenance approaches available to a sedimentologist requires a thorough understanding of the potential biases in the information recorded by each mineral- ... ...

Abstract	Interpreting the wealth of new data derived from the diverse suite of modern single-grain provenance approaches available to a sedimentologist requires a thorough understanding of the potential biases in the information recorded by each mineral-provenance system. This review focuses on the various possible mineral-specific biases in U-Pb accessory mineral provenance studies employing the minerals zircon, rutile, apatite, monazite and titanite, focussing on biases resulting from variations in source-rock mineralogy (fertility). Fertility is intimately linked to the mineral petrogenesis of crystalline basement sources, which is another key aspect of this review. This petrogenetic information, which often resides in the specialist petrology literature, has great relevance to fertility studies (particularly those measuring mineral content in modern river sediment using confluence and along-trunk sampling) as trace-element abundances and/or elemental ratios in many accessory minerals can be linked to specific lithologies. Other mineral-specific biases in single-grain provenance analysis considered include physical and chemical modifications both before and after deposition, while the diverse suite of modern single-grain analytical approaches also requires understanding of potential methodological and laboratory induced-biases. A series of multi-proxy provenance studies are presented where fertility bias apparently plays a significant role. In magma-poor metamorphic belts (e.g. segments of the Himalayas and Caledonides-Appalachians), it is shown that zircon growth is limited, and monazite, apatite or rutile associated with the youngest tectonomagmatic events are significantly more fertile. Such multi-proxy provenance studies will be greatly aided in the future by high-throughput, coupled U-Pb age – trace-element analyses integrated with automated heavy mineral determinations employing highly efficient sample preparation protocols.
Keywords	analytical methods ; apatite ; automation ; lithology ; mineral content ; provenance ; rivers ; sand ; trace elements ; zircon ; Himalayan region
Language	English
Dates of publication	2020-03
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	1792-9
ISSN	0012-8252
ISSN	0012-8252
DOI	10.1016/j.earscirev.2020.103093
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Article ; Online: The trace element composition of apatite and its application to detrital provenance studies

O'Sullivan, Gary / Chew, David / Kenny, Gavin / Henrichs, Isadora / Mulligan, Dónal

Earth-Science Reviews. 2020 Feb., v. 201 p.103044-

2020

Abstract: Apatite's ubiquity in crystalline rocks, variable trace element contents (particularly with regard to the REE, actinides and Sr), and amenability to various dating techniques based on the decay of the radioisotopes U and Th, permit specific provenance ... ...

Abstract	Apatite's ubiquity in crystalline rocks, variable trace element contents (particularly with regard to the REE, actinides and Sr), and amenability to various dating techniques based on the decay of the radioisotopes U and Th, permit specific provenance determinations. In this study, we first present a comprehensive description of the trace element behaviour of apatite in various kinds of bedrocks (igneous rocks from felsic through to ultramafic compositions, metamorphic rocks from low to high grades and of diverse protolith composition, and authigenic apatite) in which we explain why apatite is so highly diverse in terms of its trace element composition. Next, we present a synthesis of bedrock apatite trace-element compositional data from previous work, assembling a library of apatite compositions that includes the most abundant apatite-bearing lithologies in the Earth's crust, and many other less abundant rock types. Compositional statistics, classification, and a machine learning classifier are then applied to this dataset to generate biplots that can be used to determine the broad source lithology of detrital apatite, with misclassification averaging 15%. This methodology is tested in three case studies to demonstrate its utility. In these examples, detrital apatite can be convincingly linked to different lithology types, and combined apatite trace-element and UPb data can determine the terranes from which individual apatites were likely derived. The addition of apatite trace-element information therefore enables the determination of the source lithology, making the extraction of novel information and more specific provenance determinations possible, and opening up new avenues in source-to-sink modelling.
Keywords	actinides ; apatite ; bedrock ; data collection ; elemental composition ; lithology ; provenance ; statistics ; trace elements
Language	English
Dates of publication	2020-02
Publishing place	Elsevier B.V.
Document type	Article ; Online
ZDB-ID	1792-9
ISSN	0012-8252
ISSN	0012-8252
DOI	10.1016/j.earscirev.2019.103044
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Article: Collision with Gondwana or with Baltica? Ordovician magmatic arc volcanism in the Marmarosh Massif (Eastern Carpathians, Ukraine).

Gawęda, Aleksandra / Szopa, Krzysztof / Golonka, Jan / Chew, David / Stepanyuk, Leonid / Belskyy, Volodymir / Waśkowska, Anna / Siliauskas, Laurynas / Drakou, Foteini

International journal of earth sciences : Geologische Rundschau

2022 Volume 111, Issue 7, Page(s) 2181–2198

Abstract: The pre-Alpine Marmarosh Massif is a tectonically complex unit of the crystalline basement within the Eastern Outer Carpathians. In the eastern (Ukrainian) segment of this massif, two units have been identified-the Bilyi Potok Nappe and the Dilove Nappe. ...

Abstract	The pre-Alpine Marmarosh Massif is a tectonically complex unit of the crystalline basement within the Eastern Outer Carpathians. In the eastern (Ukrainian) segment of this massif, two units have been identified-the Bilyi Potok Nappe and the Dilove Nappe. Petrological investigations coupled with zircon U-Pb dating were performed on metavolcanic rocks (porphyroids) and their phyllite host rocks, sampled from three locations within the Dilove Nappe. The geochemical characteristics of the meta-rhyodacite porphyroids revealed a volcanic arc affinity of the protolith, with U-Pb zircon ages of 452.8 ± 1.5 Ma and 461.5 ± 1.6 Ma and zircon saturation temperatures in the range of 823-892 °C. The phyllite host rocks (meta-tuff) yield a U-Pb zircon maximum estimate for the eruption age at 584.7 ± 2.9 Ma. Peak amphibolite-facies metamorphism (M1) was estimated at the pressure of 600-900 MPa with a temperature range of 560-600 °C. Retrogression (M2), possibly related to Alpine nappe stacking and shearing, is assumed to have taken place at 200-250 MPa and 384-222 °C. The volcanic arc is interpreted as an early Caledonian arc that was subsequently accreted to the margin of Baltica during the closure of the easternmost Tornquist Ocean rather than Cenerian (early Paleozoic) orogenic events on the margin of East Gondwana. Supplementary information: The online version contains supplementary material available at 10.1007/s00531-022-02228-8.
Language	English
Publishing date	2022-07-16
Publishing country	Germany
Document type	Journal Article
ZDB-ID	1477582-7
ISSN	1437-3262 ; 1437-3254
ISSN (online)	1437-3262
ISSN	1437-3254
DOI	10.1007/s00531-022-02228-8
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Article: Uranium–lead phosphate chronostratigraphy: A proof of concept from the mid-Carboniferous boundary

O'Sullivan, Gary J. / Daly, J. Stephen / Murray, John / Ó'Gogáin, Aodhán / Chew, David M. / Drakou, Foteini / Guyett, Paul C. / Badenszki, Eszter / Hoare, Brendan C.

Sedimentary geology. 2021 Aug., v. 422

2021

Abstract: Sedimentary phosphates, chiefly composed of apatite group minerals, contain exceptionally high concentrations (10–200 ppm) of U relative to other sedimentary precipitates, making them an attractive target for U–Pb dating. Phosphate-rich sedimentary rocks ...

Abstract	Sedimentary phosphates, chiefly composed of apatite group minerals, contain exceptionally high concentrations (10–200 ppm) of U relative to other sedimentary precipitates, making them an attractive target for U–Pb dating. Phosphate-rich sedimentary rocks are common from the Neoproterozoic onwards and commonly occur at key points in the geological record, often coinciding with periods of significant environmental flux or facies change. There is thus a clear rationale for dating phosphatic rocks. In this study, we demonstrate how spatially-resolved U–Pb dating of sedimentary apatite by laser-ablation quadrupole inductively-coupled-plasma mass-spectrometry (LA-Q-ICPMS) can provide constraints on early phosphate diagenesis and reworking in ancient rocks. Our samples are from two locations in a well-characterized stratigraphic sequence containing phosphorites, and phosphate-rich carbonates and shales in western Ireland, which span the Mississippian–Pennsylvanian (mid-Carboniferous) boundary. Sedimentary phosphate preserves precise (<0.7% uncertainty) U–Pb ages that record early diagenesis, or sediment reworking, depending upon the facies sampled. These ages are consistent with age constraints derived from Carboniferous conodont biostratigraphy from the same sections. Phosphorite deposition, occurring on the sediment-starved margin of an epeiric basin, is constrained by U–Pb dating of apatite to the lower part of the Bashkirian stage at 320.7 ± 2.0 Ma (MSWD = 1). However, we identify a significant time-gap between the phosphorite and the immediately underlying carbonate stratigraphy, and thus attribute phosphorite accumulation to forced regression accompanying a widely recognized and significant glacial advance in Gondwana that took place at the mid-Carboniferous boundary. Our two sampling sites are several kilometers apart, broadly along strike of the basin margin, but preserve U–Pb isotopic and trace element compositional information that is strikingly consistent at the same stratigraphic levels. If used appropriately, integrated phosphate U–Pb dating and trace element analysis could provide age constraints for key parts of the Neoproterozoic and Phanerozoic, aiding reconstruction of evolutionary and paleoenvironmental records.
Keywords	Carboniferous period ; Neoproterozoic era ; basins ; biostratigraphy ; carbonates ; diagenesis ; mass spectrometry ; paleoecology ; phosphorite ; sediments ; trace elements ; uncertainty ; Ireland
Language	English
Dates of publication	2021-08
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	216739-6
ISSN	0037-0738
ISSN	0037-0738
DOI	10.1016/j.sedgeo.2021.105961
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In stock of ZB MED Bonn / Germany

Order via subito

Inter-library loan at ZB MED

Full text online

More links

Kategorien

In stock of ZB MED Bonn / Germany

Order via subito

Inter-library loan at ZB MED

Full text online

More links

Kategorien

In stock of ZB MED Bonn / Germany

Order via subito

Inter-library loan at ZB MED