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Article: Life Springs.

Van Kranendonk, Martin J / Deamer, David W / Djokic, Tara

2018 Volume 317, Issue 2, Page(s) 28–35

Language	English
Publishing date	2018-03-17
Publishing country	United States
Document type	Journal Article
ZDB-ID	246-x
ISSN	1946-7087 ; 0036-8733
ISSN (online)	1946-7087
ISSN	0036-8733
DOI	10.1038/scientificamerican0817-28
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Inferring the age and environmental characteristics of fossil sites using citizen science.

Djokic, Tara / Frese, Michael / Woods, Adam / Dettmann, Mary / Flemons, Paul / Brink, Frank / McCurry, Matthew R

PloS one

2023 Volume 18, Issue 4, Page(s) e0284388

Abstract: Not all fossil sites preserve microfossils that can be extracted using acid digestion, which may leave knowledge gaps regarding a site's age or environmental characteristics. Here we report on a citizen science approach that was developed to identify ... ...

Abstract	Not all fossil sites preserve microfossils that can be extracted using acid digestion, which may leave knowledge gaps regarding a site's age or environmental characteristics. Here we report on a citizen science approach that was developed to identify microfossils in situ on the surface of sedimentary rocks. Samples were collected from McGraths Flat, a recently discovered Miocene rainforest lake deposit located in central New South Wales, Australia. Composed entirely of iron-oxyhydroxide, McGraths Flat rocks cannot be processed using typical microfossil extraction protocols e.g., acid digestion. Instead, scanning electron microscopy (SEM) was used to automatically acquire 25,200 high-resolution images from the surface of three McGraths Flat samples, covering a total area of 1.85 cm2. The images were published on the citizen science portal DigiVol, through which 271 citizen scientists helped to identify 300 pollen and spores. The microfossil information gained in this study is biostratigraphically relevant and can be used to constrain the environmental characteristics of McGraths Flat. Our findings suggest that automated image acquisition coupled with an evaluation by citizen scientists is an effective method of determining the age and environmental characteristics of fossiliferous rocks that cannot be investigated using traditional methods such as acid digestion.
MeSH term(s)	Citizen Science ; Fossils ; Australia ; New South Wales
Language	English
Publishing date	2023-04-17
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2267670-3
ISSN	1932-6203 ; 1932-6203
ISSN (online)	1932-6203
ISSN	1932-6203
DOI	10.1371/journal.pone.0284388
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Inferring the age and environmental characteristics of fossil sites using citizen science.

Tara Djokic / Michael Frese / Adam Woods / Mary Dettmann / Paul Flemons / Frank Brink / Matthew R McCurry

PLoS ONE, Vol 18, Iss 4, p e

2023 Volume 0284388

Abstract	Not all fossil sites preserve microfossils that can be extracted using acid digestion, which may leave knowledge gaps regarding a site's age or environmental characteristics. Here we report on a citizen science approach that was developed to identify microfossils in situ on the surface of sedimentary rocks. Samples were collected from McGraths Flat, a recently discovered Miocene rainforest lake deposit located in central New South Wales, Australia. Composed entirely of iron-oxyhydroxide, McGraths Flat rocks cannot be processed using typical microfossil extraction protocols e.g., acid digestion. Instead, scanning electron microscopy (SEM) was used to automatically acquire 25,200 high-resolution images from the surface of three McGraths Flat samples, covering a total area of 1.85 cm2. The images were published on the citizen science portal DigiVol, through which 271 citizen scientists helped to identify 300 pollen and spores. The microfossil information gained in this study is biostratigraphically relevant and can be used to constrain the environmental characteristics of McGraths Flat. Our findings suggest that automated image acquisition coupled with an evaluation by citizen scientists is an effective method of determining the age and environmental characteristics of fossiliferous rocks that cannot be investigated using traditional methods such as acid digestion.
Keywords	Medicine ; R ; Science ; Q
Subject code	333
Language	English
Publishing date	2023-01-01T00:00:00Z
Publisher	Public Library of Science (PLoS)
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Elements for the Origin of Life on Land: A Deep-Time Perspective from the Pilbara Craton of Western Australia.

Van Kranendonk, Martin J / Baumgartner, Raphael / Djokic, Tara / Ota, Tsutomu / Steller, Luke / Garbe, Ulf / Nakamura, Eizo

Astrobiology

2021 Volume 21, Issue 1, Page(s) 39–59

Abstract: For decades, deep sea hydrothermal vents have been a preferred setting for the Origin of Life, but "The Water Problem" as relates to polymerization of organic molecules, together with a propensity to dilute critical prebiotic elements as well as a number ...

Abstract	For decades, deep sea hydrothermal vents have been a preferred setting for the Origin of Life, but "The Water Problem" as relates to polymerization of organic molecules, together with a propensity to dilute critical prebiotic elements as well as a number of other crucial factors, suggests that a terrestrial hot spring field with the capacity for wet
MeSH term(s)	Australia ; Hot Springs ; Origin of Life ; Silicates ; Water ; Western Australia
Chemical Substances	Silicates ; Water (059QF0KO0R)
Language	English
Publishing date	2021-01-06
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2047736-3
ISSN	1557-8070 ; 1531-1074
ISSN (online)	1557-8070
ISSN	1531-1074
DOI	10.1089/ast.2019.2107
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: BIOCHEMIE. WIE ENTSTAND DAS LEBEN? Die ersten Organismen bildeten sich nach neuen Erkenntnissen nicht in der Tiefsee, sondern in heißen Quellen und Tümpeln von Vulkanlandschaften mit ständigen Nass-trocken-Wechseln

van Kranendonk, Martin J. / Djokic, Tara / Deamer, David

Spektrum der Wissenschaft : Spektrum spezial

2018 Volume -, Issue 2, Page(s) 6

Language	German
Document type	Article
ZDB-ID	2938616-0
ISSN	2193-4452 ; 2625-7939
Database	Current Contents Medicine

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Zs.A 2122 -Spezial-: Show issues

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Article ; Online: A Reconstructed Subaerial Hot Spring Field in the ∼3.5 Billion-Year-Old Dresser Formation, North Pole Dome, Pilbara Craton, Western Australia.

Djokic, Tara / Van Kranendonk, Martin J / Campbell, Kathleen A / Havig, Jeff R / Walter, Malcolm R / Guido, Diego M

Astrobiology

2020 Volume 21, Issue 1, Page(s) 1–38

Abstract: Recent discoveries of geyserite and siliceous sinter with textural biosignatures in the ∼3.5 Ga Dresser Formation of the Pilbara Craton, Western Australia, extended the record of inhabited subaerial hot springs on Earth by ∼3 billion years, back to the ... ...

Abstract	Recent discoveries of geyserite and siliceous sinter with textural biosignatures in the ∼3.5 Ga Dresser Formation of the Pilbara Craton, Western Australia, extended the record of inhabited subaerial hot springs on Earth by ∼3 billion years, back to the time when siliceous sinter deposits are known to have formed on Mars (
MeSH term(s)	Exobiology ; Fossils ; Geologic Sediments ; Hot Springs ; Western Australia
Language	English
Publishing date	2020-12-01
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2047736-3
ISSN	1557-8070 ; 1531-1074
ISSN (online)	1557-8070
ISSN	1531-1074
DOI	10.1089/ast.2019.2072
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Corrigendum: Earliest signs of life on land preserved in ca. 3.5 Ga hot spring deposits.

Djokic, Tara / Van Kranendonk, Martin J / Campbell, Kathleen A / Walter, Malcolm R / Ward, Colin R

Nature communications

2017 Volume 8, Page(s) 16149

Abstract: This corrects the article DOI: 10.1038/ncomms15263. ...

Abstract	This corrects the article DOI: 10.1038/ncomms15263.
Language	English
Publishing date	2017-08-16
Publishing country	England
Document type	Journal Article ; Published Erratum
ISSN	2041-1723
ISSN (online)	2041-1723
DOI	10.1038/ncomms16149
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Biomolecules from Fossilized Hot Spring Sinters: Implications for the Search for Life on Mars.

Teece, Bronwyn L / George, Simon C / Djokic, Tara / Campbell, Kathleen A / Ruff, Steven W / Van Kranendonk, Martin J

Astrobiology

2020 Volume 20, Issue 4, Page(s) 537–551

Abstract: Hot spring environments are commonly dominated by silica sinters that precipitate by the rapid cooling of silica-saturated fluids and the activity of microbial communities. However, the potential for preservation of organic traces of life in silica ... ...

Abstract	Hot spring environments are commonly dominated by silica sinters that precipitate by the rapid cooling of silica-saturated fluids and the activity of microbial communities. However, the potential for preservation of organic traces of life in silica sinters back through time is not well understood. This is important for the exploration of early life on Earth and possibly Mars. Most previous studies have focused on physical preservation in samples <900 years old, with only a few focused on organic biomarkers. In this study, we investigate the organic geochemistry of hot spring samples from El Tatio, Chile and the Taupo Volcanic Zone, with ages varying from modern to ∼9.4 ka. Results show that all samples contain opaline silica and contain hydrocarbons that are indicative of a cyanobacterial origin. A ∼3 ka recrystallized, quartz-bearing sample also contains traces of cyanobacterial biomarkers. No aromatic compounds were detected in a ∼9.4 ka opal-A sample or in a modern sinter breccia sample. All other samples contain naphthalene, with one sample also containing other polyaromatic hydrocarbons. These aromatic hydrocarbons have a thermally mature distribution that is perhaps reflective of geothermal fluids migrating from deep, rather than surface, reservoirs. These data show that hot spring sinters can preserve biomolecules from the local microbial community, and that crystallinity rather than age may be the determining factor in their preservation. This research provides support for the exploration for biomolecules in opaline silica deposits on Mars.
MeSH term(s)	Chile ; Cyanobacteria ; Earth, Planet ; Fossils ; Geologic Sediments/chemistry ; Hot Springs ; Hydrocarbons, Aromatic/analysis ; Mars ; Origin of Life ; Quartz/analysis ; Silicon Dioxide/analysis
Chemical Substances	Hydrocarbons, Aromatic ; opoka ; Quartz (14808-60-7) ; Silicon Dioxide (7631-86-9)
Language	English
Publishing date	2020-03-05
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2047736-3
ISSN	1557-8070 ; 1531-1074
ISSN (online)	1557-8070
ISSN	1531-1074
DOI	10.1089/ast.2018.2018
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Early Archean biogeochemical iron cycling and nutrient availability: New insights from a 3.5 Ga land-sea transition

Johnson, Clark M. / Zheng, Xin-Yuan / Djokic, Tara / Van Kranendonk, Martin J. / Czaja, Andrew D. / Roden, Eric E. / Beard, Brian L.

Earth-science reviews. 2022 Mar. 10,

2022

Abstract: The chemical and isotopic compositions of Precambrian Fe-rich chemical sedimentary rocks have figured prominently in discussions on the Fe biogeochemical cycle and redox conditions in the early Earth. Broad trends of decreasing δ⁵⁶Fe values for Eoarchean ...

Abstract	The chemical and isotopic compositions of Precambrian Fe-rich chemical sedimentary rocks have figured prominently in discussions on the Fe biogeochemical cycle and redox conditions in the early Earth. Broad trends of decreasing δ⁵⁶Fe values for Eoarchean to Paleoproterozoic iron formations (IFs) and jaspilites (hematite-chert) with decreasing age reflect a general increase in extent of oxidation of aqueous Fe(II) (Fe(II)ₐq) in marine environments, consistent with increasing oxygenation of surface environments, particularly since the Mesoarchean. Such trends may record a shift from anaerobic to aerobic oxidation, in part reflecting increasing nutrient abundances that follow increased emergence of continental crust. It is commonly proposed that the size of the biosphere in the early Archean was largely nutrient limited, specifically P limited. Highly positive δ⁵⁶Fe values for Fe oxides in chemical sedimentary rocks deposited in open marine environments at this time are consistent with excess Fe(II)ₐq. Here, we present new data on Fe isotopes and trace element chemistry for 3.4–3.5 Ga jaspilites from the North Pole region of the Pilbara Craton, including the first example of a land-sea transition preserved in the lower Dresser Formation as jaspilite deposition in restricted basin and open-marine settings. A review of the possible mechanisms of Fe(II)ₐq oxidation in the early Archean - including O₂ generated by oxygenic photosynthesis, UV photo-oxidation, or photoferrotrophy (anoxygenic photosynthesis) - suggests that the latter is most likely, in light of evidence for low-O₂ contents and the strong role that silica plays in inhibiting abiologic Fe(II) oxidation. Y + REE contents of lower Dresser Formation jaspilites indicate a freshwater component in the restricted basin settings, in contrast to exclusively seawater components in the open-marine environments. δ⁵⁶Fe values for open-marine jaspilites are highly positive. (δ⁵⁶Fe ~ +1 to +2.4‰), similar to other jaspilites and IFs of Eoarchean to Paleoarchean age. Assuming photoferrotrophy as the oxidative pathway, this would indicate electron donor (Fe(II)ₐq) excess and nutrient limitation. For the restricted-basin jaspilites of the lower Dresser Formation, δ⁵⁶Fe values extend to slightly negative values (δ⁵⁶Fe ~ −0.4‰), correlating with changes in Y + REE contents that indicate fluid mixing. In toto, there is a range of ~3‰ in δ⁵⁶Fe values across the land-sea transition of the lower Dresser Formation, significantly exceeding the range previously measured in early Archean jaspilites. Combined with an advection-dispersion-reaction model for Fe(II)ₐq oxidation via photoferrotrophy, these observations suggest a range of nutrient abundance with environment, where samples from near-shore or restricted settings record excess nutrients from terrestrial input and hence electron donor limitation. Integrating the new results from the Pilbara Craton with the broader Fe isotope database for Eoarchean through Paleoarchean jaspilites and IFs, as well as a simple mass-balance model relating δ⁵⁶Fe values and P contents, it becomes apparent that the relatively high nutrient abundance seen only in restricted settings at ~3.5 Ga becomes more characteristic of the open oceans by ~3.2 Ga. This expansion of nutrient availability is correlated with a marked increase in ⁸⁷Sr/⁸⁶Sr ratios for seawater, which can be shown to be a proxy for P delivery to the open oceans from the continents via weathering fluxes. Collectively, these findings demonstrate the importance of considering geologic context in interpreting Fe isotope and chemical compositions of jaspilites and IFs. Capture of the land-sea transition of the lower Dresser Formation provides insights into the biosphere that would have been missed in sample suites that only record open-marine conditions.
Keywords	Eoarchean era ; Mesoarchean era ; Paleoarchean era ; Paleoproterozoic era ; basins ; biogeochemical cycles ; biosphere ; databases ; freshwater ; models ; nutrient availability ; photooxidation ; photosynthesis ; seawater ; silica ; Arctic region
Language	English
Dates of publication	2022-0310
Publishing place	Elsevier B.V.
Document type	Article
Note	Pre-press version
ZDB-ID	1792-9
ISSN	0012-8252
ISSN	0012-8252
DOI	10.1016/j.earscirev.2022.103992
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Earliest signs of life on land preserved in ca. 3.5 Ga hot spring deposits.

Djokic, Tara / Van Kranendonk, Martin J / Campbell, Kathleen A / Walter, Malcolm R / Ward, Colin R

Nature communications

2017 Volume 8, Page(s) 15263

Abstract: The ca. 3.48 Ga Dresser Formation, Pilbara Craton, Western Australia, is well known for hosting some of Earth's earliest convincing evidence of life (stromatolites, fractionated sulfur/carbon isotopes, microfossils) within a dynamic, low-eruptive ... ...

Abstract	The ca. 3.48 Ga Dresser Formation, Pilbara Craton, Western Australia, is well known for hosting some of Earth's earliest convincing evidence of life (stromatolites, fractionated sulfur/carbon isotopes, microfossils) within a dynamic, low-eruptive volcanic caldera affected by voluminous hydrothermal fluid circulation. However, missing from the caldera model were surface manifestations of the volcanic-hydrothermal system (hot springs, geysers) and their unequivocal link with life. Here we present new discoveries of hot spring deposits including geyserite, sinter terracettes and mineralized remnants of hot spring pools/vents, all of which preserve a suite of microbial biosignatures indicative of the earliest life on land. These include stromatolites, newly observed microbial palisade fabric and gas bubbles preserved in inferred mineralized, exopolymeric substance. These findings extend the known geological record of inhabited terrestrial hot springs on Earth by ∼3 billion years and offer an analogue in the search for potential fossil life in ancient Martian hot springs.
Language	English
Publishing date	2017-05-09
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ISSN	2041-1723
ISSN (online)	2041-1723
DOI	10.1038/ncomms15263
Database	MEDical Literature Analysis and Retrieval System OnLINE

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