期刊
ANNUAL REVIEW OF EARTH AND PLANETARY SCIENCES
卷 37, 期 -, 页码 507-534出版社
ANNUAL REVIEWS
DOI: 10.1146/annurev.earth.36.031207.124233
关键词
anoxia; Fe-S-Mo paleoredox proxies; Fe and Mo isotopes; ocean chemistry; Proterozoic
资金
- U.S. National Science Foundation
- NASA Exobiology Program
The evolution and extinction of life are tied intimately to the oxygen state Of the Ocean, And particularly to the presence of anoxic and H2S-containing (euxinic) water oil a global scale. Anoxia and euxinia were more common in the past, relative to today's <0.5% euxinic seafloor. We are able to constrain the distributions Of these Conditions through a combination of indirect numerical modeling methods and more direct gcochemical proxies, with particular emphasis on Fe-S-Mo analysis of fine-grained siliciclastic rocks for the latter. Establishing the spatiotemporal pattern of oecanic redox is more difficult with very old rocks because of the limited availability of well-dated, Well-preserved materials that span shallow and deep environments across time lines. Despite these difficulties, the Multiple approaches synthesized in our case study point to global oxygen-deficiency in the deep Ocean and per. haps euxinia during most, if not all, of the Proterozoic and likely extending into the early Paleozoic.
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