EPSC 445 Lecture 5: 1112 mindep lecture.docx
13 Feb 2015
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Marine 34s and sedex deposit: beaker of water, it got 15% s34, 15% s32. Atlantic ii deep a sedex deposit in the making: rifting of africa->sedex deposit forming present time, basins have stockwork and sulphide filling in the brine pool, fluid with high salinity and go thru some overflow. T is not that high, salinity is very high: whats happening in this env-> euxinic mud and basin anoxi environment where u see sulphide and galena. Action happening very close to sea water interface but rather below sea. Towards a sedex model: series of basin. Conditions of metal transport/deposition: condition of lead and contour if condition in the bottom part, ph increase would be the dominant control of depositon (b->c part in the graph). Reduction to dump the mineral for oxidizing fluid you: mixing with sea water. Black shaly rock gets lighter in color due to oxidation of org matter.
