阿尔金麻粒岩相杂岩的时代及塔里木盆地的基底

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本项目为国家85—101项目

详细信息

THE AGE OF THE ALTUN GRANULITE FACIES COMPLEX AND THE BASEMENT OF THE TARIM BASIN

摘要: 阿尔金杂岩是由一些麻粒岩相长英质片麻岩、基性麻粒岩和斜长角闪岩组成的岩石，Ｓｍ－Ｎｄ年代学研究表明，其形成时代为２７８９Ｍａ，它们组成了塔里木盆地南部古老基底，这与组成盆地北部基底的托格杂岩在形成方式和时代上均不相同。这种基底性质的差异控制着盆地南北的沉积发育、构造演化与油气聚集。

Abstract: The Altun complex,having a Sm-Nd isotopic age of 2789 Ma,is composed mainly of felsic gneiss,basic granulite and amphibolite,which form the old basement of the southern partof the Tarim basin. With respect to the mode of formation and geological age the Altun complex is different from the Tog complex making up the basement of the northern part of thebasin. Such difference in nature of the basement controls the sedimentation,tectonic evolutionand oil-gas accumulation in the southern and northern parts of the Tarim basin.