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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Pyrite paragenesis and multiple sulfur isotope distribution in late Archean and early Paleoproterozoic Hamersley Basin sediments
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Pyrite paragenesis and multiple sulfur isotope distribution in late Archean and early Paleoproterozoic Hamersley Basin sediments

机译：太古代晚期和古元古代哈默斯利盆地沉积物中硫铁矿共生和多种硫同位素分布

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The sulfur isotope record in late Archean and early Paleoproterozoic rocks is of considerable importance because it provides evidence for changes in early Earth atmospheric oxygen levels and potentially constrains the origin and relative impact of various microbial metabolisms during the transition from an anoxic to oxic atmosphere. Mass independently fractionated (MIF) Sulfur isotopes reveal late Archean and early Paleoproterozoic sulfur Sources in different pyrite morphologies in Western Australia's Hamersley Basin. Multiple sulfur isotope values in late Archean pyrite vary according to morphology. Fine grained pyrite has positive sulfur MIF, indicating a reduced elemental sulfur Source, whereas pyrite nodules have negative sulfur MIF, potentially derived from soluble sulfate via microbial sulfate reduction. The Hamersley Basin delta S-34-Delta S-33 record suggests that the extent of oxygenation of the surface ocean fluctuated through the Late Archean from at least 2.6 Ga, more than 150 million yr before the Great Oxidation Event. In the early Paleoproterozoic, there is less distinction between pyrite morphologies with respect to sulfur isotope fractionation, and pyrite from the Brockman Iron Formation trends toward modern sulfur isotope values. An important exception to this is the strong negative MIF recorded in layer parallel pyrite in Paleoproterozoic carbonate facies iron formation. This may suggest that deeper water hydrothermal environments remained anoxic while shallower water environments became more oxidised by the early Paleoproterozoic. The results of the current study indicate that sulfide paragenesis is highly significant when investigating Archean and early Paleoproterozoic multiple sulfur isotope compositions and sulfur sources.
机译：太古宙晚期和古元古代早期岩石中的硫同位素记录具有相当重要的意义，因为它提供了地球早期大气中氧含量变化的证据，并有可能限制从缺氧向有氧大气过渡过程中各种微生物代谢的起源和相对影响。质量独立分级（MIF）的硫同位素揭示了西澳大利亚州哈默斯利盆地的不同黄铁矿形态的太古宙晚期和古元古代早期硫源。晚太古代硫铁矿中的多种硫同位素值根据形态而变化。细粒黄铁矿的硫MIF为正，表明元素硫源减少，而黄铁矿结核的硫MIF为负，可能是通过微生物硫酸盐还原法从可溶性硫酸盐中提取的。哈默斯利盆地的三角洲S-34-三角洲S-33记录表明，大洋氧化事件发生前的1.5亿年以上，地表海洋的氧化程度从至少2.6 Ga起至少在2.6 Ga上下波动。在古元古代早期，关于硫同位素分馏的黄铁矿形态与从布罗克曼铁矿形成的黄铁矿向现代硫同位素值发展趋势之间的区别较小。一个重要的例外是在古元古代碳酸盐岩相中铁形成的层状黄铁矿中记录到强负MIF。这可能表明较深的水热环境仍然是缺氧的，而较浅的水环境由于早期的古元古代而变得更加氧化。目前的研究结果表明，在研究太古代和早古元古代的多种硫同位素组成和硫源时，硫化物的共生作用非常重要。

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