塔里木盆地瓦基里塔格辉长岩^(40)Ar^-^(39)Ar年龄及其意义  

The ^(40)Ar^-^(39)Ar isotopic age of Wajilitag gabbro in Tarim basin and its geological significance.

作　　者：李曰俊[1] 贾承造[1] 胡世玲[2] 黄智斌[1] 曾强[1] 谭泽金[1] 

机构地区：[1]塔里木石油勘探开发指挥部,新疆库尔勒841000 [2]中国科学院地质与地球物理研究所,北京100029

出　　处：《岩石学报》1999年第4期594-599,共6页Acta Petrologica Sinica

基　　金：国家 "九五"重点科技攻关项目;塔指科技攻关项目

摘　　要：瓦基里塔格位于新疆塔里木盆地塔中构造带 （即中央隆起） 的西部， 巴楚县城南东约４０ｋｍ 。这里发育一套轻微变质的碎屑岩哑地层， 其中有基性－超基性岩体侵入。对在此采集的２ 块辉长岩样品进行Ａｒ－Ａｒ定年， 获得的坪年龄分别为８２５．０±２．０Ｍａ 和８３７．３±２．０Ｍａ， 相应的等时年龄为８２１．４±８．０Ｍａ和８３３．３±１５．３Ｍａ。这是首次获得的塔里木盆地腹地较可靠的前寒武纪同位素年龄数据， 为塔里木盆地的构造类型、基底性质、组成和时代等地质问题的正确认识， 提供了一份重要的基础资料， 对于该地区的油气勘探部署也有十分重要的意义。Wajilitag mountains, about 40km southeast to Bachu town, is located at western Tazhong tectonic belt (Central Rise), Tarim basin, NW China. There exists a set of slightly metamorphic unfossiliferous clastic rocks at Wajilitag. Basic ultrabasic intrusions are developed in the clastic rocks. Two gabbro specimens were sampled from the intrusions. Plate ages of 825 0±2 0Ma and 837 3±2 0Ma and respective isochronal ages of 821 4±8 0Ma and 833 3±15 3Ma were got after Ar Ar analysis. This is the first group of reliable Precambrian isotopic ages in the inner part of Tarim basin. It is an important data for study on the age, basement component and tectonic type, etc. of Tarim basin, and also significant for the petroleum exploration planning in that area.

关 键 词：塔里木盆地 辉长岩 同位素年龄 氩39-氧40 

分 类 号：P588.124[天文地球—岩石学] P597.3[天文地球—地质学]