Geochemistry of metabasalts and hydrothermal alteration zones associated with c. 3.45 Ga chert and barite deposits: implications for the geological setting of the Warrawoona Group, Pilbara Craton, Australia

Martin J. Van Kranendonk; Franco Pirajno

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Geochemistry of metabasalts and hydrothermal alteration zones associated with c. 3.45 Ga chert and barite deposits: implications for the geological setting of the Warrawoona Group, Pilbara Craton, Australia

机译：与c有关的玄武岩和热液蚀变带的地球化学。 3.45钙质和重晶石矿床：对澳大利亚Pilbara Craton的Warrawoona集团地质环境的影响

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Relatively unaltered metabasalts of the Archaean Coonterunah and Warrawoona Groups, Pilbara Craton are compared with altered metabasalts from immediately beneath bedded cherts of these groups to provide evidence for the depositional environment and hydrothermal alteration processes of crust formation. The geochemistry of relatively unaltered basalt, stratigraphy, and inherited zircon data indicate that the lower Warrawoona Group (3.53–3.43 Ga) formed as an oceanic plateau complex built on a sialic basement to 3.724 Ga, following an analogue with the Phanerozoic Kerguelen oceanic plateau, and not as a mid-ocean ridge or convergent volcanic-arc complex as previously proposed. Advanced argillic, argillic, phyllic, and propylitic alteration zones in footwall basalts of this succession are products of repeated episodes of seafloor hydrothermal circulation, syngenetic with bedded chert deposition, in the distal parts of high-sulphidation epithermal systems.

机译：比较古细菌和古拉瓦努纳族（Warrawoona Groups），皮尔巴拉克拉顿（Pilbara Craton）组中相对未变的元玄武岩，与这些层状cher石下方直接变化的元玄武岩进行比较，以提供证据沉积环境和地壳形成的热液蚀变过程。相对未变的玄武岩，地层和继承的锆石数据的地球化学表明，较低的Warrawoona群（3.53-3.43 Ga）形成为海洋高原复合物是在潘生代克尔盖伦高原上建立的，而不是洋中部 ridge或先前提出的收敛的火山-弧复合体。该演替的下盘玄武岩中的高级阿耳基，阿耳基，叶状和次丙基变化区域是在高硫化作用的远端，海床热液循环反复发生，同生的伴有bed石沉积，

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《Geochemistry: Exploration, Environment, Analysis》 |2004年第3期|00000253-00000278|共26页
作者
Martin J. Van Kranendonk; Franco Pirajno;
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作者单位

Geological Survey of Western Australia, 100 Plain St, East Perth, Western Australia 6004, Australia(e-mail: martin.vankranendonk@doir.wa.gov.au franco.pirajno@doir.wa.gov.au);

Geological Survey of Western Australia, 100 Plain St, East Perth, Western Australia 6004, Australia(e-mail: martin.vankranendonk@doir.wa.gov.au franco.pirajno@doir.wa.gov.au);

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正文语种 eng
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Archaean; Pilbara Craton; basalt geochemisty; hydrothermal alteration; mineralization;

机译：古细菌皮尔巴拉（Pilbara）Craton;玄武岩地球化学热液蚀变;矿化;

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Geochemistry of metabasalts and hydrothermal alteration zones associated with c. 3.45 Ga chert and barite deposits: implications for the geological setting of the Warrawoona Group, Pilbara Craton, Australia

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