New Progress in 1:50000 Regional Geological Survey in Lichuan Area, Western Hubei Province
详细信息
- 责任者：Wang Lingzhan (Wuhan Center ; China Geological Survey ; Wuhan 430205 ; China) ; Tu Bing
- 刊名：Geology and Mineral Resources of South China
- 出版年：2013
- 卷期：29(3)
- 关键词：区域地质调查 ; regional geological survey ; 湖北 ; Hubei Province
- 页码：p.169-176
- 图表：4 illus., 30 refs.
- 分类号：1400
- issnNo：ISSN1007-3701
- isbnNo：CN42-1417/P
摘要
Base on the International Stratigraphy Guide(2012) and working on the lithostratigraphy,biostratigraphy,and event stratigraphy,multiple stratigraphic division and correlation sequence has been improved during 1:50 000 regional geological survey in Lichuan area,Western Hubei province.Four conodont zones were established in Late Permian-Early Triassic Changxing Formation.The P/T boundary index fossil Hindeodus parvus appeared in microbialite,located at the top of Changxing Formation,and zircon U-Pb age of claystone above the P/T boundary was also obtained.Petrological and geochemical characteristics indicated that the siliceous rocks of Upper Permian Wujiaping Formation formed by volcano sedimentation with biological effect,and deposited in continental shelf under anoxic condition.Through analyzing characteristics of rock types and assemblages,summarizing sedimentary facies type,four sedimentary facies models were established.Sedimentary types and spatial distribution of top of Silurian Shamao Formation,Devonian Yuntaiguan Formation and Huangjiadeng Formation,Carboniferous Dapu Formation,Permian Changxing Formation,Triassic Daye formation and Badong formation were especially revealed.After investigation,we established stratigraphic structural framework,clarified the tectonic evolution history,divided the structural deformation stage,and discussed the tectonic evolution during the Mesozoic and Cenozoic by tectonic stress field inversion,superposed folds analysis and regional tectonic evolution.We also systematic summarized the form of neotectonic movement,and the relationship among geological hazard stratum,structure,lithology and human activities.
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