吐哈盆地东缘泥盆纪花岗岩的确定及其地质意义.pdf

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第25卷第8期
地质通报
Vol 25, No8
2006年8月
GEOLOGICAL BULLETIN OF CHINA
g,2006
吐哈盆地东缘泥盆纪花岗岩的确定及其地质意义
李亚萍1,孙桂华1,李锦轶,王彦斌2,徐新3,何国琦,贾金典5
LI Ya-ping, SUN Guihua, LI Jin-yi, WANG Yan-bin
XU Xin, HE Guo-qi, JLA Jin-dian,
1.中国地质科学院地质研究所,北京100037;2.北京离子探针中心,北京100037
3.斯资源环境研究中心,新乌鲁木齐8300004.北京大学地质系,北京100871;
5.新地局第六地质大队,新疆哈密839000
1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
2. Beijing SHR/MP Center, Bejjing 100037
3. Xinjiang Research Center of Resources and Environment, urumqi 830000, Xinjiang, China
4. Department of Geology, Peking University, Bejing 100871, China;
5. No. 6 Regional Geologicd Pa, Xin ing Bue of Geology and Mineral Eploration and Developmen
Hami 839000, Xinjiang, China
摘要:通过财吐哈盆地东蟓四顶黑山超单元中的黑云母花岗岩进行结石 SHIRIMP UーPb定年,获得(386±5)Ma(MSWD=1.01)
的PbU表面年龄。根据该岩体的岩石学和石的矿物学特征,将此年龄解释为该岩体的侵位年龄。根据这一定年结果和该
花岚岩与岩(被当地地质エ作者归入古元古代星星峡群的变质岩)具有相同的构造变形特征,结合已有的年代学、岩石化学和
相关地质资料,可以得出如下初步结论:①吐哈盆地东螈与南为同一古生代活动陆線的不同部分,其形成演化与以康古尔塔
格樘带中洋壳残片为代表的古洋岩石圈板块向西伯利亚古板块之下的俯冲有关;②吐哈金地东辣以近东西走向、向南倾斜的
片理或片麻理为特征的变质变形事件发生在386Ma以后。
关词:古生代活动陆;黑云母花岗岩;结石 SHRIMP U-Pb定年;吐哈盆地东缘;东天山
中图分类号:P588.1211;P5971.3文标识码:A
文章编号:1671-2552(2006)08-0932-05
Li Y P, Sun G H, Li J Y, Wang Y B, Xu X, He G Q, Jia J D. Devonian granite on the eastern margin of the
Tuha basin in the East Tianshan, Xinjiang, China and its tectonic implication. Geological Bulletin of China, 2006, 25
(8):932-936
Abstract: SHRIMP U-pb dating of cons from ioe raie of the iin isan upit on the eastern margin of the
Tuha basin yields an apparent P/U age of 386+5 Ma (MSWD=1. 01). According to the petrological characteristis and
related zircon CL images, this age is explained as the intrusion age of the granite. According to this dating result and similar
metamorphism and deformation of the granite to those of its county rocks (which are classified by local geologists as the P
leoproterozoic Xingxingxia Group), combined with the available chronological, geochemical and related geological data, the
authors come to the following preliminary conclusions: O the eastem and southem margins of the Tuha basin are different
pars of the same Paleozoic active continental margin, whose formation and evolution is related to the subduction of the paleo
oceanic lithospheric plate, represented by fragments of oceanic crust in the Kanggurtag collisional belt, northward under the
Siberian paleoplate, and )the event of deformation and metamorphism on the eastem margin of the basin, which is charac-
收日期:2006-04-15;日期:2006-05-22
甚金项目:国家重要基础研究发展规划项目《中国西部中亚型造山与成矿》综合研究课题《中亚型造山与成矿综合研究》(编号
2001CB409810)成果。
作者首介:李亚(1971-),女,在读博士,构造地质学专业。Eーmail:yin216126.com