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  1. 防災科研関係論文

Archean to Paleoproterozoic seawater halogen ratios recorded by fluid inclusions in chert and hydrothermal quartz

https://nied-repo.bosai.go.jp/records/5500
https://nied-repo.bosai.go.jp/records/5500
02174159-1dcb-4ade-85f9-ab0ef301611c
Item type researchmap(1)
公開日 2023-12-26
タイトル
言語 en
タイトル Archean to Paleoproterozoic seawater halogen ratios recorded by fluid inclusions in chert and hydrothermal quartz
言語
言語 eng
著者 Ray Burgess

× Ray Burgess

en Ray Burgess

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Sarah L. Goldsmith

× Sarah L. Goldsmith

en Sarah L. Goldsmith

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Hirochika Sumino

× Hirochika Sumino

en Hirochika Sumino

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Jamie D. Gilmour

× Jamie D. Gilmour

en Jamie D. Gilmour

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Bernard Marty

× Bernard Marty

en Bernard Marty

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Magali Pujol

× Magali Pujol

en Magali Pujol

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Kurt O. Konhauser

× Kurt O. Konhauser

en Kurt O. Konhauser

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抄録
内容記述タイプ Other
内容記述 <title>Abstract</title>
Past changes in the halogen composition of seawater are anticipated based on the differing behavior of chlorine and bromine that are strongly partitioned into seawater, relative to iodine, which is extremely depleted in modern seawater and enriched in marine sediments due to biological uptake. Here we assess the use of chert, a chemical sediment that precipitated throughout the Precambrian, as a proxy for halide ratios in ancient seawater. We determine a set of criteria that can be used to assess the primary nature of halogens and show that ancient seawater Br/Cl and I/Cl ratios can be resolved in chert samples from the 2.5 Ga Dales Gorge Member of the Brockman Banded Iron Formation, Hamersley Group, Western Australia. The values determined of Br/Cl ~2 × 10-3 M and I/Cl ~30 × 10-6 M are comparable to fluid inclusions in hydrothermal quartz from the 3.5 Ga North Pole area, Pilbara Craton, Western Australia, that were the subject of previous reconstructions of ancient ocean salinity and atmospheric isotopic composition. While the similar Br/Cl and I/Cl values indicate no substantial change in the ocean halide system over the interval 2.5–3.5Ga, compared to modern seawater, the ancient ocean was enriched in Br and I relative to Cl. The I/Cl value is intermediate between bulk Earth (assumed chondritic) and the modern seawater ratio, which can be explained by a smaller organic reservoir because this is the major control on marine iodine at the present day. Br/Cl ratios are about 30% higher than both modern seawater and contemporary seafloor hydrothermal systems, perhaps indicating a stronger mantle buffering of seawater halogens during the Archean.
言語 en
書誌情報 en : American Mineralogist

巻 105, 号 9, p. 1317-1325, 発行日 2020-09-01
出版者
言語 en
出版者 Mineralogical Society of America
ISSN
収録物識別子タイプ EISSN
収録物識別子 1945-3027
DOI
関連識別子 10.2138/am-2020-7238
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