摘要
通过对新疆乌尔禾、塔里木盆地印干村等地和贵州西部地区的沥青与干酪根的Ｐｂ－Ｓｒ－Ｎｄ同位素分析工作，对固体同位素在石油与沥青的形成时代及成因方面的研究进行了讨论。根据Ｐｂ－Ｐｂ等时线，塔里木干酪根岩的形成时代为（６３０±１５０）Ｍａ和（４５７±１３０）Ｍａ；根据Ｒｂ－Ｓｒ等时线，乌尔禾沥青形成于（２８６±１２）Ｍａ，印干村沥青形成于（８５２±２１０）Ｍａ。在成因研究方面，干酪根岩代表了表壳岩的同位素体系特征，而沥青的同位素体系特征表明其与深部来源有关：乌尔禾沥青的来源与再循环地幔源有关，而塔里木的沥青则来源于下地壳。
s Nd, Sr, Pb isotopes were analyzed for bitumen and kerogen samples collected from Wuerhe, Yin’gan Village, etc., North Xinjiang and western Guizhou Province. Pb-Pb isochrons yield two ages of 630 Ma and 457 Ma, which are interpreted as the formation ages of kerogens from Tarim Basin. Rb-Sr isochrons give ages of (286±21)Ma for the bitumen from Wuerhe and (852±210) Ma for the bitumen from Yin' gan Village.Pb-Sr-Nd isotpic sytematicas indicated that te kerogen were derived fron sedimentary rodls ,and the bitumen were derived from recycled mantle (in Wuerhe) or the lower crust( in Yin’gan Village).
出处
《地球化学》
CAS
CSCD
北大核心
1997年第2期57-67,共11页
Geochimica
基金
中国石油天然气总公司资助
