华南陡山沱期古地理环境及“雪球地球”研究新进展  

Doushantuoan paleogeographic environment in South China and new progress in the study of the“snow-ball Earth”

作　　者：孙知明[1] 杨振宇[2] 裴军令[1] Jean BESSE Melina MACOUIN Stuart GILDER Magali ADER 

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]南京大学地球科学系,江苏南京210093 [3]Institut de Physiquedu Globede Paris

出　　处：《地质通报》2004年第8期728-731,共4页Geological Bulletin of China

基　　金：2001年中法先进研究计划(PRA-T01-01);国家杰出青年基金(49925410)资助。

摘　　要：华南地块陡山沱组的古地磁和C同位素研究揭示了其形成于赤道附近的古地理环境。对冰期后的盖帽白云岩的C同位素研究表明,δ13C从-5‰开始有缓慢升高的趋势,与世界上Marinoan冰期其他剖面的C同位素变化相一致。陡山沱期大气中CO2含量的升高可能与Rodinia超大陆的裂解及火山活动等密切相关。Paleomagnetic and carbon isotope studies of the Doushantuo Formation in the South China block have revealed that the block formed in a paleogeographic environment near the equator.Carbon i sotope study of postglacial snow-capped dolomite indicates thatδ 13 C has a trend of slow increase from-5‰,which is in agreement with the carbon isotope change in other sections of the Marinoan glacial stage in the world.The increase in CO 2 content in the atmosphere in the Doushantuoan might be closely relat-ed to the breakup of the supercontinent Rodinia and volcanic activities.

关 键 词：华南 陡山沱期 古地理环境 雪球地球 

分 类 号：P534.31[天文地球—古生物学与地层学] P531[天文地球—地质学]