华南地质与矿产2016，Vol.32Issue(1)：1-9,9.DOI:10.3969/j.issn.1007-3701.2016.01.001
湖北恩施硒富集区中二叠世孤峰组露头层序地层研究
Sequence stratigraphy of Middle Permian Gufeng Formation from selenium-rich area in Enshi, Southwestern Hubei
摘要
Abstract
By researching the stratigraphic section, combined with trace element analysis, sequence boundary, sequence division and comparison, in addition the influence of the spatial distribution of selenium of seleni-um-rich Middle Permian Gufeng Formation was studied. Middle Permian Gufeng Formation of the study area can be concluded as four types of basic sequence, which were silica carbonaceous shale-silica carbonaceous rock, silica carbonaceous shale-silica carbonaceous rock inter-calated with limestone lenses, silica carbona-ceous rock-micrite with carbon, and silica carbonaceous rock-fine crystalline dolomite with carbon. Three types of sequence boundary were identified, in which the boundary of Maokou Formation and Gufeng Forma-tion wasⅢ-type sequence boundary, and the transition surface of rock character in middle of Gufeng forma-tion was Ⅱ-type sequence boundary, in addition, the boundary of Longtan Formation and Gufeng Formation wasⅠ-type sequence boundary, and two types of Three-grade Sequence Interface(SQ1,SQ2)was subdivided. Through comparison analysis, sequence-internal structures and types of basic sequence with transgressions of the area was obvious difference, and the sedimentation paleogeographic feature was formed in shallow water in the southern side and deep water in northern side. Through analysis of the coupling relationship of se-quence stratigraphy and selenium anomaly, high selenium anomalous character was discovered near Ⅱ-type sequence boundary in Gufeng Formation, that the new prospecting criteria was established.关键词
硒元素/孤峰组/层序地层/鄂西恩施地区Key words
Selenium/Gufeng Formation/sequence stratigraphy/Enshi, Southwestern Hubei Province分类
地质学引用本文复制引用
石先滨,翁茂芝,罗红,许露露,龚志愚,赵雪松,段先锋..湖北恩施硒富集区中二叠世孤峰组露头层序地层研究[J].华南地质与矿产,2016,32(1):1-9,9.基金项目
中国地质调查局国土资源大调查项目“湖北1∶5万三岔幅、红土溪幅、官店口幅、万寨幅、椿木营幅、下坪幅区域地质调查”(12120113061800)资助 （12120113061800）
