地质论评2009，Vol.55Issue(5)：712-721,10.
鄂西-湘西地区震旦系灯影期岩相古地理与层控铅锌矿关系初探
Preliminary Approach on the Stratabound Lead-Zinc Deposits and Lithofacies Palaeogeographic Framework of the Dengyingxia Age, Sinian(Edicarian),in Western Hunan-Western Hubei Area
摘要
Abstract
Based on field investigations, the sedimentary characteristics and horizontal correlation as well as two types of facies-changing surfaces and two types of diachronisms of the upper Sinian(Edicarian) for more than dozen main logged sections in the study area are comprehensively studied in this paper, all of them become the basis to establish the lithofacies palaeogeographic map of the Dengyingxia Ages of Sinian System in the light of dominant facies and in the way to make stratigraphic map. The feature of paleogeographical framework was that the southern formed in shallow water and the northern in deep water; the difference in lithology, color, grain type of the stratigraphic sediment-styles and the assemblages and the character of sediment-facies were all controlled by the sedimentary facies-changed and diachronism. Vertically, the stratigraphic succession from the dolomite of the Dengying Formation makes up of a larger scale upward- shoaling succession of sedimentary facies and demonstrates a growth process of the ramp carbonate platform. Horizontally, the principal lithofacies palaeogeographic units in the upper Yangtze region,i. e.carbonate tidal flat,subtidal facies of restricted platform and platform marginal facies as well as basin facies from the northern to the southern have been described. The stratabound lead—zinc deposits distributing between platform marginal facies and subtidal facies of restricted carbonate platform were dominated by the lithofacies palaeogeographic framework.关键词
灯影期/震旦纪(埃迪卡拉纪)/岩相古地理/矿源层/层控铅锌矿Key words
Dengyingxia age/ Sinian(Edicarian)/ lithofacies palaeogeography/ source bed/ stratabound lead-zinc deposits分类
天文与地球科学引用本文复制引用
汤朝阳,段其发,邹先武,李堃..鄂西-湘西地区震旦系灯影期岩相古地理与层控铅锌矿关系初探[J].地质论评,2009,55(5):712-721,10.基金项目
本文为中国地质调查局项目"湘西-鄂西地区铅锌多金属矿勘查选区研究"(编号 1212010632005)的成果 （编号 1212010632005）
