沉积与特提斯地质2017，Vol.37Issue(4)：58-68,11.
保山地块下二叠统丁家寨组碳同位素特征
Carbon isotope chemostratigraphy of the Lower Permian Dingjiazhai Formation in the Baoshan Block,Yunnan
摘要
Abstract
The present paper deals,on the basis of section measurement and borehole geological records,with the carbon and oxygen isotope study of the carbonate rocks and gravel-bearing calcareous greywacke from the Lower Permian Dingjiazhai Formation in the Baoshan Block,Yunnan. The δ13 C values of the carbonate rocks both in the overlying and underlying horizons of the Lower Permian Dingjiazhai Formation are positive values while those within the Dingjiazhai Formation display one or several negative excursions. The coral and bryozoan fossils found separately in the Pumenqian and Dingjiazhai Formations have provided the new evidence for the age dating of the Formatioms mentioned above. The correlation between the carbon and oxygen isotope values for the Dingjiazhai Formation and other places in the world suggests a highly linear correlation of the carbon and oxygen isotope data during the Carboniferous - Permian. The negative excursions of δ13 C values may well be related to the surface exposure during the deposition and diagenesis of the glacial lowstand deposits. Numerous factors such as the increase of CO2 contents,global warming,strengthening of weathering,and the increase of terrigenous supply caused by the large-scale eruption of the Woniusi basalts as well as the glaciation have exerted the combined effects on the variations in marine inorganic carbon isotope values for the Dingjiazhai Formation.关键词
碳同位素/负偏移/碳酸盐岩/冰川作用Key words
carbon isotope/negative excursion/carbonate rock/glaciation分类
天文与地球科学引用本文复制引用
罗亮,王冬兵,尹福光,任飞,宁括步..保山地块下二叠统丁家寨组碳同位素特征[J].沉积与特提斯地质,2017,37(4):58-68,11.基金项目
西南三江有色金属资源基地调查项目(编号:DD20160016)资助 （编号:DD20160016）
