首页|Effects of Volcanic Activity on Organic Matter Sources and the Paleoenvironment:Geochemical Evidence from Upper Carboniferous Source Rocks(Batamayineishan Formation)in Eastern Junggar,NW China
Effects of Volcanic Activity on Organic Matter Sources and the Paleoenvironment:Geochemical Evidence from Upper Carboniferous Source Rocks(Batamayineishan Formation)in Eastern Junggar,NW China
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The mudstone,gray tuffite and carbonaceous shale in the Upper Carboniferous Bata-mayineishan Formation(Bashan Formation)are essential source rocks for the volcanic reservoir in eastern Junggar,northwestern China.The kerogen components,vitrinite reflectance,Rock-Eval pyrol-ysis,lipid biomarkers and isotope compositions were measured to understand the provenance and dep-ositional environment of Bashan Formation under the background of volcanic activities.There were 10 and 4 periods of volcanic eruptions identified in the wells CS and DZ,respectively.The source rocks de-veloped in the late or intermittent phase of volcanic activity.The original island arcs of the Early Car-boniferous evolved into the Wucaiwan sag and the Dishuiquan sag in the Bashan Formation.The Wu-caiwan sag inherited the restricted,closed residual sea,which had a slightly anoxic and hypersaline en-vironment.The Dishuiquan sag was generally an oxidizing lacustrine environment,influenced by a ma-rine transgression that may have occurred at the end of the DZIII period during the Late Carbonifer-ous.Although the total organic matter decreased due to the volcanic eruption,ash could cause an in-crease of aquatic organisms,coinciding with increases in salinity and reducibility in the Dishuiquan sag.
Ming Shao、Tianzhu Lei、Shuncun Zhang、Shengyin Zhang、Yu Pei、Sen Song
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Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
Key Laboratory of Petroleum Resources Exploration and Evaluation,Gansu Province,Lanzhou 730000,China
State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization,Baotou Research Institute of Rare Earths,Baotou 014060,China
National Natural science Foundation of ChinaNational Natural science Foundation of ChinaKey Laboratory Project of Gansu Province
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