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Quartz crystallinity index:New quantitative evidence for biogenic silica of the Late Ordovician to Early Silurian organic-rich shale in the Sichuan Basin and adjacent areas,China

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Science China Earth Sciences 2021年第5期64卷 773-787页

作者： Guoheng LIU Gangyi ZHAI Rui YANG Tingpeng HE Bin WEI School of Geosciences China University of Petroleum(East China)Qingdao 266580China Oil and Gas Survey China Geological SurveyBeijing 100083China Key Laboratory of Tectonics and Petroleum Resources Ministry of EducationChina University of GeosciencesWuhan 430074China Chongqing Institute of Geology and Mineral Resource Chongqing 401120China Liaohe Petroleum Exploration Bureau Panjin 124010China

Quartz crystallinity index(QCI)was used to reflect the crystallisation of silica in the Late Ordovician Wufeng(WF)and Early Silurian Longmaxi(LM)Formation shale,as well as the airborne volcanic ash-derived silica in the Lucaogou Formation tuffaceous shale,to distinguish the two types of silica.The silica in different graptolite biozones exhibited different crystallisation.The WF2–3,LM1–4 graptolite biozones showed obviously lower QCI values than the LM5–9 graptolite biozones and the Lucaogou Formation samples.The graptolite organisms played the role of adsorption,fixation,and precipitation in silicon accumulation and enrichment in stratum.The biogenic origin caused the poorest quartz crystallisation in WF2–3 and LM1–4 graptolite biozones samples.The airborne volcanic ash-derived silica in the Lucaogou Formation tuffaceous shale exhibited relatively poor quartz crystallisation because of weaker diagenesis intensity.Generally,although the WF2–3 and LM1–4 graptolite biozones underwent strong diagenesis and contained a small amount of detrital quartz,the silica still exhibited lower QCI values than the airborne volcanic ash-derived silica in the Lucaogou Formation tuffaceous shale.The biogenic silica crystallisation was much poorer than that of the airborne volcanic ash-derived silica.QCI is an effective quantitative index to demonstrate the biogenic silica in the organic-rich and silica-rich shale.

关键词： Biogenic silica volcanic ash-derived silica Quartz crystallinity index Late Ordovician Wufeng Formation Early Silurian Longmaxi Formation

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