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Article ; Online: Ocean Sciences with the Spilhaus Projection: A Seamless Ocean Map for Spatial Data Recognition.

Chen, Jie / Zhang, Tao / Tominaga, Masako / Escartin, Javier / Kang, Ruixin

2023 Volume 10, Issue 1, Page(s) 410

Abstract: The ocean, as a vast interconnected body of water on Earth, plays an essential role in Earth's planetary dynamics, climate change, and the evolution of human society and decision-making processes. An ocean-focused global map is necessary to visually ... ...

Abstract	The ocean, as a vast interconnected body of water on Earth, plays an essential role in Earth's planetary dynamics, climate change, and the evolution of human society and decision-making processes. An ocean-focused global map is necessary to visually capture numerous phenomena within the world's ocean and seafloor. Here we present the power of the Spilhaus square projection with various geological and geophysical datasets, including bathymetry, teleseismicity, seafloor geography, and seafloor spreading parameters. The Spilhaus projection, compared to widely-used map projections (e.g., Mercator and Robinson), emphasizes the seamless connection of water masses surrounded by continents. This projection has recently garnered attention for presenting ocean-oriented data, although it is not extensively used and currently supported by the ArcGIS software. Maps presented here provide not only a novel geological perspective on the world ocean as a whole body, but also new insights/questions to be addressed regarding features and processes of the water body, the seafloor, and ocean-atmosphere dynamics, which can be used for research, education, media, and policy decisions, and promote similar approaches.
Language	English
Publishing date	2023-06-24
Publishing country	England
Document type	Dataset ; Journal Article
ZDB-ID	2775191-0
ISSN	2052-4463 ; 2052-4463
ISSN (online)	2052-4463
ISSN	2052-4463
DOI	10.1038/s41597-023-02309-6
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: A New Middle to Late Jurassic Geomagnetic Polarity Time Scale (GPTS) From a Multiscale Marine Magnetic Anomaly Survey of the Pacific Jurassic Quiet Zone

Tominaga, Masako / Tivey, Maurice A. / Sager, William W.

Journal of geophysical research. 2021 Mar., v. 126, no. 3

2021

Abstract: The Geomagnetic Polarity Time Scale (GPTS) provides a basis for the geological timescale, quantifies geomagnetic field behavior, and gives a time framework for geologic studies. We build a revised Middle to Late Jurassic GPTS by using a new multiscale ... ...

Abstract	The Geomagnetic Polarity Time Scale (GPTS) provides a basis for the geological timescale, quantifies geomagnetic field behavior, and gives a time framework for geologic studies. We build a revised Middle to Late Jurassic GPTS by using a new multiscale magnetic profile, combining sea surface, midwater, and autonomous underwater vehicle near‐bottom magnetic anomaly data from the Hawaiian lineation set in the Pacific Jurassic Quiet Zone (JQZ). We correlate the new profile with a previously published contemporaneous magnetic sequence from the Japanese lineation set. We then establish geomagnetic polarity block models as a basis for our interpretation of the origin and nature of JQZ magnetic anomalies and a GPTS. A significant level of coherency between short‐wavelength anomalies for both the Japanese and Hawaiian lineation magnetic anomaly sequences suggests the existence of a regionally coherent field during this period of rapid geomagnetic reversals. Our study implies the rapid onset of the Mesozoic Dipole Low from M42 through M39 and then a subsequent gradual recovery in field strength into the Cenozoic. The new GPTS, together with the Japanese sequence, extends the magnetic reversal history from M29 back in time to M44. We identify a zone of varying, difficult‐to‐correlate anomalies termed the Hawaiian Disturbed Zone, which is similar to the zone of low amplitude, difficult‐to‐correlate anomalies in the Japanese sequence termed the Low Amplitude Zone (LAZ). We suggest that the LAZ, bounded by M39–M41 isochrons, may in fact represent the core of what is more commonly known as the JQZ crust.
Keywords	Cenozoic era ; Late Jurassic epoch ; geophysics ; magnetic fields ; research ; surveys
Language	English
Dates of publication	2021-03
Publishing place	John Wiley & Sons, Ltd
Document type	Article
Note	JOURNAL ARTICLE
ISSN	2169-9313
DOI	10.1029/2020JB021136
Database	NAL-Catalogue (AGRICOLA)

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Article: Along‐Margin Variations in Breakup Volcanism at the Eastern North American Margin

Greene, John A. / Tominaga, Masako / Miller, Nathaniel C.

Journal of geophysical research. 2020 Dec., v. 125, no. 12

2020

Abstract: We model the magnetic signature of rift‐related volcanism to understand the distribution and volume of magmatic activity that occurred during the breakup of Pangaea and early Atlantic opening at the Eastern North American Margin (ENAM). Along‐strike ... ...

Abstract	We model the magnetic signature of rift‐related volcanism to understand the distribution and volume of magmatic activity that occurred during the breakup of Pangaea and early Atlantic opening at the Eastern North American Margin (ENAM). Along‐strike variations in the amplitude and character of the prominent East Coast Magnetic Anomaly (ECMA) suggest that the emplacement of the volcanic layers producing this anomaly similarly varied along the margin. We use three‐dimensional magnetic forward modeling constrained by seismic interpretations to identify along‐margin variations in volcanic thickness and width that can explain the observed amplitude and character of the ECMA. Our model results suggest that the ECMA is produced by a combination of both first‐order (~600–1,000 km) and second‐order (~50–100 km) magmatic segmentation. The first‐order magmatic segmentation could have resulted from preexisting variations in crustal thickness and rheology developed during the tectonic amalgamation of Pangaea. The second‐order magmatic segmentation developed during continental breakup and likely influenced the segmentation and transform fault spacing of the initial, and modern, Mid‐Atlantic Ridge. These variations in magmatism show how extension and thermal weakening was distributed at the ENAM during continental breakup and how this breakup magmatism was related to both previous and subsequent Wilson cycle stages.
Keywords	coasts ; geophysics ; magnetism ; research ; rheology ; tectonics ; volcanic activity
Language	English
Dates of publication	2020-12
Publishing place	John Wiley & Sons, Ltd
Document type	Article
Note	JOURNAL ARTICLE
ISSN	2169-9313
DOI	10.1029/2020JB020040
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Fluid sources and overpressures within the central Cascadia Subduction Zone revealed by a warm, high-flux seafloor seep.

Philip, Brendan T / Solomon, Evan A / Kelley, Deborah S / Tréhu, Anne M / Whorley, Theresa L / Roland, Emily / Tominaga, Masako / Collier, Robert W

Science advances

2023 Volume 9, Issue 4, Page(s) eadd6688

Abstract: Pythia's Oasis is a newly discovered seafloor seep on the Central Oregon segment of the Cascadia Subduction Zone, where focused venting emits highly altered fluids ~9°C above the background temperature. The seep fluid chemistry is unique for Cascadia and ...

Abstract	Pythia's Oasis is a newly discovered seafloor seep on the Central Oregon segment of the Cascadia Subduction Zone, where focused venting emits highly altered fluids ~9°C above the background temperature. The seep fluid chemistry is unique for Cascadia and includes extreme enrichment of boron and lithium and depletion of chloride, potassium, and magnesium. We conclude that the fluids are sourced from pore water compaction and mineral dehydration reactions with minimum source temperatures of 150° to 250°C, placing the source at or near the plate boundary offshore Central Oregon. Estimated fluid flow rates of 10 to 30 cm s
Language	English
Publishing date	2023-01-25
Publishing country	United States
Document type	Journal Article
ZDB-ID	2810933-8
ISSN	2375-2548 ; 2375-2548
ISSN (online)	2375-2548
ISSN	2375-2548
DOI	10.1126/sciadv.add6688
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Article: Magnetic Anomaly Map of Shatsky Rise and Its Implications for Oceanic Plateau Formation

Huang, Yanming / Sager, William W. / Zhang, Jinchang / Tominaga, Masako / Greene, John / Nakanishi, Masao

Journal of geophysical research. 2021 Feb., v. 126, no. 2

2021

Abstract: Shatsky Rise oceanic plateau was emplaced during a period of frequent geomagnetic polarity reversals, allowing reconstruction of its tectonic evolution using magnetic anomalies. Prior studies mainly focused on identifying magnetic isochrons and ... ...

Abstract	Shatsky Rise oceanic plateau was emplaced during a period of frequent geomagnetic polarity reversals, allowing reconstruction of its tectonic evolution using magnetic anomalies. Prior studies mainly focused on identifying magnetic isochrons and encountered difficulties in tracing magnetic lineations over high relief. We complied a large magnetic data set over Shatsky Rise and its environs, using 5.5 × 10⁶ data points from 96 geophysical cruises spanning 54 years. The long‐time span and heterogeneity of component data sets made data merger a challenge. Contributions of internal and external fields, and spurious readings were removed during processing. A “backbone” method, using recent GPS‐navigated data as a foundation, was developed to improve the coherency of the data set. The singular characteristic of the new magnetic anomaly map is that linear magnetic anomalies are ubiquitous. In nearly every place where data are dense enough to delineate anomaly trends, the plateau and surrounding crust are characterized by linear anomalies. Discordant anomalies in some areas imply complex tectonics related to triple junction migration and ridge reorientation. Tamu Massif apparently formed along a segment of Pacific‐Farallon spreading ridge that rotated by 90° as a triple junction migrated through the edifice. Ori Massif appears to have formed on the Pacific‐Izanagi ridge between triple junctions. Shirshov Massif contains discordant lineations that may indicate a microplate. The pervasive occurrence of linear magnetic anomalies within Shatsky Rise implies that these volcanic edifices must have formed by spreading analogous to mid‐ocean ridges that formed anomalously thick crust.
Keywords	data collection ; geophysics ; magnetism ; research ; tectonics
Language	English
Dates of publication	2021-02
Publishing place	John Wiley & Sons, Ltd
Document type	Article
Note	JOURNAL ARTICLE
ISSN	2169-9313
DOI	10.1029/2019JB019116
Database	NAL-Catalogue (AGRICOLA)

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Article: Refining the Formation and Early Evolution of the Eastern North American Margin: New Insights From Multiscale Magnetic Anomaly Analyses

Greene, John A. / Tominaga, Masako / Miller, Nathaniel C. / Hutchinson, Deborah R. / Karl, Matthew R.

Journal of geophysical research. 2017 Nov., v. 122, no. 11

2017

Abstract: To investigate the oceanic lithosphere formation and early seafloor spreading history of the North Atlantic Ocean, we examine multiscale magnetic anomaly data from the Jurassic/Early Cretaceous age Eastern North American Margin (ENAM) between 31 and 40°N. ...

Abstract	To investigate the oceanic lithosphere formation and early seafloor spreading history of the North Atlantic Ocean, we examine multiscale magnetic anomaly data from the Jurassic/Early Cretaceous age Eastern North American Margin (ENAM) between 31 and 40°N. We integrate newly acquired sea surface magnetic anomaly and seismic reflection data with publicly available aeromagnetic and composite magnetic anomaly grids, satellite‐derived gravity anomaly, and satellite‐derived and shipboard bathymetry data. We evaluate these data sets to (1) refine magnetic anomaly correlations throughout the ENAM and assign updated ages and chron numbers to M0–M25 and eight pre‐M25 anomalies; (2) identify five correlatable magnetic anomalies between the East Coast Magnetic Anomaly (ECMA) and Blake Spur Magnetic Anomaly (BSMA), which may document the earliest Atlantic seafloor spreading or synrift magmatism; (3) suggest preexisting margin structure and rifting segmentation may have influenced the seafloor spreading regimes in the Atlantic Jurassic Quiet Zone (JQZ); (4) suggest that, if the BSMA source is oceanic crust, the BSMA may be M series magnetic anomaly M42 (~168.5 Ma); (5) examine the along and across margin variation in seafloor spreading rates and spreading center orientations from the BSMA to M25, suggesting asymmetric crustal accretion accommodated the straightening of the ridge from the bend in the ECMA to the more linear M25; and (6) observe anomalously high‐amplitude magnetic anomalies near the Hudson Fan, which may be related to a short‐lived propagating rift segment that could have helped accommodate the crustal alignment during the early Atlantic opening.
Keywords	Early Cretaceous epoch ; Jurassic period ; coasts ; evolution ; geophysics ; gravity ; magnetism ; research ; Atlantic Ocean
Language	English
Dates of publication	2017-11
Size	p. 8724-8748.
Publishing place	John Wiley & Sons, Ltd
Document type	Article
Note	JOURNAL ARTICLE
ISSN	2169-9313
DOI	10.1002/2017JB014308
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Magnetic anomaly map of Ori Massif and its implications for oceanic plateau formation

Huang, Yanming / Sager, William W. / Tominaga, Masako / Greene, John A. / Zhang, Jinchang / Nakanishi, Masao

2018

Abstract: Many oceanic plateaus have been emplaced at or adjacent to mid-ocean ridges. To explain plateau volume and thickened crust compared to normal oceanic crust, hotspot–ridge interaction is commonly assumed, but the manner of interaction remains unclear. The ...

Abstract	Many oceanic plateaus have been emplaced at or adjacent to mid-ocean ridges. To explain plateau volume and thickened crust compared to normal oceanic crust, hotspot–ridge interaction is commonly assumed, but the manner of interaction remains unclear. The Shatsky Rise oceanic plateau is a large volcanic mountain that formed at a triple junction during Late Jurassic and Early Cretaceous time. Recent drilling and seismic investigations suggest that the intermediate edifice in the rise, Ori Massif, is a central volcano. Paradoxically, magnetic lineations were traced across parts of Ori Massif, implying formation at a spreading ridge. In this study, we examined magnetic anomalies over and around Ori Massif to obtain insights about the formation of this volcanic edifice. Magnetic data from 21 cruises were corrected, combined, and gridded to construct a magnetic anomaly map. Forward and inverse magnetic modeling was done to investigate the magnetic structure of Ori Massif. The results imply that this large volcanic edifice is predominantly characterized by linear magnetic anomalies resulting from alternating normal and reversed polarity magnetization blocks, analogous to magnetic anomalies recorded by spreading-ridges. This magnetic structure is not expected for a central volcano that was built by long runout lava flows, implying that Ori Massif eruptions must have been constrained near the ridge axis. Magnetic bights on the north and south boundaries of Ori Massif imply that it was bracketed by triple junctions, indicating complex ridge tectonics during the formation of Shatsky Rise. The surprising finding that Ori Massif is traversed by coherent linear magnetic anomalies indicates that oceanic plateaus can record seafloor spreading magnetic anomalies despite large crustal thickness. Other oceanic plateaus also record linear magnetic anomalies, implying a link between divergent plate boundaries and oceanic plateau volcanism.
Subject code	550
Language	English
Publisher	Elsevier
Publishing country	de
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Multi-scale magnetic mapping of serpentinite carbonation.

Tominaga, Masako / Beinlich, Andreas / Lima, Eduardo A / Tivey, Maurice A / Hampton, Brian A / Weiss, Benjamin / Harigane, Yumiko

Nature communications

2017 Volume 8, Issue 1, Page(s) 1870

Abstract: Peridotite carbonation represents a critical step within the long-term carbon cycle by sequestering volatile ... ...

Abstract	Peridotite carbonation represents a critical step within the long-term carbon cycle by sequestering volatile CO
Language	English
Publishing date	2017-11-30
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
ISSN	2041-1723
ISSN (online)	2041-1723
DOI	10.1038/s41467-017-01610-4
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Book ; Online: Workshop report on hard-rock drilling into mid-Cretaceous Pacific oceanic crust on the Hawaiian North Arch

Morishita, Tomoaki / Umino, Susumu / Kimura, Jun-Ichi / Yamashita, Mikiya / Ono, Shigeaki / Michibayashi, Katsuyoshi / Tominaga, Masako / Klein, Frieder / Garcia, Michael O.

eISSN: 1816-3459

2019

Abstract: The architecture, formation, and modification of oceanic plates are fundamental to our understanding of key geologic processes of the Earth. Geophysical surveys were conducted around a site near the Hawaiian Islands (northeastern Hawaiian North Arch ... ...

Abstract	The architecture, formation, and modification of oceanic plates are fundamental to our understanding of key geologic processes of the Earth. Geophysical surveys were conducted around a site near the Hawaiian Islands (northeastern Hawaiian North Arch region; Hawaiian North Arch hereafter), which is one of three potential sites for an International Ocean Discovery Program mantle drilling proposal for the Pacific plate that was submitted in 2012. The Hawaiian North Arch site is located in 78–81 Ma Cretaceous crust, which had an estimated full spreading rate of 7–8 cm yr −1 . This site fills a major gap in our understanding of oceanic crust. Previously drilling has been skewed to young or older crust ( <15 or >110 Ma) and slow-spread crust. P-wave velocity structure in the uppermost mantle of the Hawaiian North Arch shows a strong azimuthal anisotropy, whereas Moho reflections below the basement are variable: strong and continuous, weak, diffuse, or unclear. We assume that the strength of the Moho reflection is related to the aging of the oceanic plate. The Hawaiian volcanic chain (200 km to the southwest of the proposed drill site) and the nearby North Arch magmatism on the proposed Hawaiian North Arch sites might also have affected recognition of the Moho via deformation and/or magma intrusion into the lower crust of the uppermost mantle. This workshop report describes scientific targets for 2 km deep-ocean drilling in the Hawaiian North Arch region in order to provide information about the lower crust from unrecovered age and spreading rate gaps from previous ocean drillings. Other scientific objectives to be achieved by drilling cores before reaching the target depth of the project are also described in this report.
Subject code	333
Language	English
Publishing date	2019-12-02
Publishing country	de
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Hazardous explosive eruptions of a recharging multi-cyclic island arc caldera

Preine, Jonas / Karstens, Jens / Hübscher, Christian / Druitt, Tim / Kutterolf, Steffen / Nomikou, Paraskevi / Manga, Michael / Gertisser, Ralf / Pank, Katharina / Beethe, Sarah / Berthod, Carole / Crutchley, Gareth / McIntosh, Iona / Ronge, Thomas / Tominaga, Masako / Clark, Acacia / DeBari, Susan / Johnston, Raymond / Mateo, Zenon /

Peccia, Ally / Jones, Christopher / Kletetschka, Günther / Metcalfe, Abigail / Bernard, Alexis / Chen, Hehe / Chiyonobu, Shun / Fernandez-Perez, Tatiana / Joshi, Kumar Batuk / Koukousioura, Olga / McCanta, Molly / Morris, Antony / Polymenakou, Paraskevi / Woodhouse, Adam / Yamamoto, Yuzuru / Wang, Kuo-Lung / Lee, Hao-Yang / Li, Xiaohui / Papanikolaou, Dimitrios

2024

Abstract: Caldera-forming eruptions of silicic volcanic systems are among the most devastating events on Earth. By contrast, post-collapse volcanic activity initiating new caldera cycles is generally considered less hazardous. Formed after Santorini’s latest ... ...

Abstract	Caldera-forming eruptions of silicic volcanic systems are among the most devastating events on Earth. By contrast, post-collapse volcanic activity initiating new caldera cycles is generally considered less hazardous. Formed after Santorini’s latest caldera-forming eruption of ~1600 bce , the Kameni Volcano in the southern Aegean Sea enables the eruptive evolution of a recharging multi-cyclic caldera to be reconstructed. Kameni’s eruptive record has been documented by onshore products and historical descriptions of mainly effusive eruptions dating back to 197 bce . Here we combine high-resolution seismic reflection data with cored lithologies from International Ocean Discovery Program Expedition 398 at four sites to determine the submarine architecture and volcanic history of intra-caldera deposits from Kameni. Our shore-crossing analysis reveals the deposits of a submarine explosive eruption that produced up to 3.1 km 3 of pumice and ash, which we relate to a historical eruption in 726 ce . The estimated volcanic explosivity index of magnitude 5 exceeds previously considered worst-case eruptive scenarios for Santorini. Our finding that the Santorini caldera is capable of producing large explosive eruptions at an early stage in the caldera cycle implies an elevated hazard potential for the eastern Mediterranean region, and potentially for other recharging silicic calderas.
Subject code	550
Language	English
Publishing date	2024-03-25
Publisher	Nature Research
Publishing country	de
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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