GSTDTAP  > 气候变化
DOI10.1002/2017GL076311
Low-Fe(III) Greenalite Was a Primary Mineral From Neoarchean Oceans
Johnson, Jena E.1,2; Muhling, Janet R.3,4; Cosmidis, Julie1,5; Rasmussen, Birger4; Templeton, Alexis S.1
2018-04-16
发表期刊GEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
EISSN1944-8007
出版年2018
卷号45期号:7页码:3182-3192
文章类型Article
语种英语
国家USA; Australia
英文摘要

Banded iron formations (BIFs) represent chemical precipitation from Earth's early oceans and therefore contain insights into ancient marine biogeochemistry. However, BIFs have undergone multiple episodes of alteration, making it difficult to assess the primary mineral assemblage. Nanoscale mineral inclusions from 2.5 billion year old BIFs and ferruginous cherts provide new evidence that iron silicates were primary minerals deposited from the Neoarchean ocean, contrasting sharply with current models for BIF inception. Here we used multiscale imaging and spectroscopic techniques to characterize the best preserved examples of these inclusions. Our integrated results demonstrate that these early minerals were low-Fe(III) greenalite. We present potential pathways in which low-Fe(III) greenalite could have formed through changes in saturation state and/or iron oxidation and reduction. Future constraints for ancient ocean chemistry and early life's activities should include low-Fe(III) greenalite as a primary mineral in the Neoarchean ocean.


Plain Language Summary Chemical precipitates from Earth's early oceans hold clues to ancient seawater chemistry and biological activities, but we first need to understand what the original minerals were in ancient marine deposits. We characterized nanoscale mineral inclusions from 2.5 billion year old banded iron formations and determined that the primary minerals were iron-rich silicate minerals dominated by reduced iron, challenging current hypotheses for banded iron formation centered on iron oxides. Our results suggest that our planet at this time had a very reducing ocean and further enable us to present several biogeochemical mineral formation hypotheses that can now be tested to better understand the activities of early life on ancient Earth.


领域气候变化
收录类别SCI-E
WOS记录号WOS:000435743400036
WOS关键词BANDED IRON-FORMATION ; TRANSVAAL SUPERGROUP ; FE(II) OXIDATION ; FORMATION DEPOSITION ; GRIQUALAND WEST ; HAMERSLEY GROUP ; SILICA CYCLE ; FE ; DIAGENESIS ; GENESIS
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/27064
专题气候变化
作者单位1.Univ Colorado, Dept Geosci, Boulder, CO 80309 USA;
2.Univ Michigan, Dept Earth & Environm Sci, Ann Arbor, MI 48109 USA;
3.Univ Western Australia, Sch Earth Sci, Crawley, WA, Australia;
4.Curtin Univ, Dept Appl Geol, Perth, WA, Australia;
5.Penn State Univ, Dept Geosci, University Pk, PA 16802 USA
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GB/T 7714
Johnson, Jena E.,Muhling, Janet R.,Cosmidis, Julie,et al. Low-Fe(III) Greenalite Was a Primary Mineral From Neoarchean Oceans[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(7):3182-3192.
APA Johnson, Jena E.,Muhling, Janet R.,Cosmidis, Julie,Rasmussen, Birger,&Templeton, Alexis S..(2018).Low-Fe(III) Greenalite Was a Primary Mineral From Neoarchean Oceans.GEOPHYSICAL RESEARCH LETTERS,45(7),3182-3192.
MLA Johnson, Jena E.,et al."Low-Fe(III) Greenalite Was a Primary Mineral From Neoarchean Oceans".GEOPHYSICAL RESEARCH LETTERS 45.7(2018):3182-3192.
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