地质科技情报2011，Vol.30Issue(1)：15-19,5.
广西来宾二叠系栖霞组黏土矿物和地球化学特征初步研究及地质意义
Preliminary Mineralogical and Geochemical Analysis on the Chihsia Formation of Tieqiao Section, Laibin, Guangxi and Their Geological Implications
摘要
Abstract
It is still unsolved whether there were paleolands during the biggest middle Permian transgression in the South China region in the past two decades. It is even hard to know if those paleolands sheded terrigenous materials into their surrounding marine environments. In order to evaluate the variation of the terrigenous input during the Chihsian time, this research analyses the clay minerals and geochemistry of the Chihsia Formation of Tieqiao section in Guangxi. Mineralogical results indicate that illite, chlorite and a minor content of kaolinite and montmorillonite (without excluding the sepiolite), are the clay minerals recorded in the Chihsia Formation. The distribution of the phyllosilicate shows the high content of illite and chlorite in the lower and the upper parts of the formation, which decreases in the middle one. The clay minerals are considered to be mainly detrital in origin and also authigenic where pyrite has grown on the illite. Geochemical analysis demonstrates that the contents of element Al, Fe, and Ti, common index of terrigenous input, are higher in the lower and the upper parts than those in the middle part of the succession. Both the mineralogical and geochemical results imply an evident cyclic variation of terrigenous input, from decrease to increase, during the Chihsian time, and should be of significance for further paleogeographic reconstruction.关键词
栖霞组/黏土矿物/铁桥剖面/陆源碎屑Key words
Chihsia Formation/ clay mineral/ Tieqiao section/ terrigenous input分类
天文与地球科学引用本文复制引用
Bouchikhi Hadjira,王夏,马仲武,伍明,颜佳新..广西来宾二叠系栖霞组黏土矿物和地球化学特征初步研究及地质意义[J].地质科技情报,2011,30(1):15-19,5.基金项目
国家自然科学基金项目(40472062) （40472062）
