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| 新疆准噶尔晚古生代陆壳垂向生长（Ⅰ）——后碰撞深成岩浆活动的时限 | |
| 引用本文： | 韩宝福,季建清,宋彪,陈立辉,张磊.新疆准噶尔晚古生代陆壳垂向生长（Ⅰ）——后碰撞深成岩浆活动的时限[J].岩石学报,2006,22(5):1077-1086. |
| 作者姓名： | 韩宝福 季建清 宋彪 陈立辉 张磊 |
| 作者单位： | 1. 北京大学地球与空间科学学院造山带与地壳演化教育部重点实验室,北京,100871 2. 北京离子探针中心,中国地质科学院地质研究所,北京,100037 3. 南京大学地球科学系,内生金属矿床成矿机制研究国家重点实验室,南京,210093 |
| 摘 要： | 准噶尔是新疆北部古生代造山带的重要组成部分，以广泛发育晚古生代后碰撞花岗岩为特征，是中亚造山带中显生宙陆壳生长作用非常显著的地区之一。根据新近获得的SHRIMP锆石U-Pb年龄，并参考已经发表的锆石U-Pb年龄，本文重新厘定了准噶尔晚古生代后碰撞深成岩浆活动的时限。按照最新的国际地质年表中石炭纪和二叠纪划分方案（Gradstein et a1．，2004），准噶尔后碰撞深成岩浆活动是从早石炭世中-晚维宪期开始、于早二叠世末期结束的。东准噶尔后碰撞深成岩浆活动发生在330-265Ma之间，而西准噶尔后碰撞深成岩浆活动的时限在340-275Ma之间，持续时间分别约65Ma。但是，在东准噶尔，后碰撞深成岩浆活动集中在330～310Ma和305～280Ma两个时段发生，而在西准噶尔，后碰撞深成岩浆活动的高峰发生在310～295Ma之间。准噶尔晚古生代后碰撞深成岩浆活动在空间上没有受到重要地质界线（如蛇绿岩带）的分隔控制，在有的地方花岗岩还可以侵位在蛇绿岩带之中。而晚古生代后碰撞深成岩浆活动不但在准噶尔分布广泛，而且在准噶尔北邻的阿尔泰造山带和南邻的天山造山带中均有出现，具有广泛的区域性。 |
| 关 键 词： | 晚古生代 后碰撞深成岩浆作用 大陆地壳生长 准噶尔 |
| 文章编号： | 1000-0569/2006/022(05)-1077-86 |
| 收稿时间： | 12 10 2005 12:00AM |
| 修稿时间： | 03 16 2006 12:00AM |
Late Paleozoic vertical growth of continental crust around the Junggar Basin, Xinjiang, China ( Part Ⅰ): Timing of post-collisional plutonism |
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| HAN BaoFu,JI JianQing,SONG Biao,CHEN LiHui and ZHANG Lei.Late Paleozoic vertical growth of continental crust around the Junggar Basin, Xinjiang, China ( Part Ⅰ): Timing of post-collisional plutonism[J].Acta Petrologica Sinica,2006,22(5):1077-1086. | |
| Authors: | HAN BaoFu JI JianQing SONG Biao CHEN LiHui and ZHANG Lei |
| Institution: | 1. Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, School of Earth and Space Sciences, Peking University, Beijing 100871, China ;2. Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China ;3. State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, China |
| Abstract: | As an important part of the Paleozoic orogenic belt in northern Xinjiang,the Junggar is characterized by intense and extensive development of Late Paleozoic granitoid plutons together with minor mafic plutons,and it is one of the representative regions for the Phanerozoic continental crustal growth in the Central Asian Orogenic Belt.On the basis of new SHRIMP zircon U-Pb dating on the plutons in the East and West Junggar,in association with the zircon U-Pb ages from the literature,an attempt is made in this study to establish the timing of the late Paleozoic post-collisional plutonism in the region.It is concluded that the Late Paleozoic post- collisional plutonism occurred from middle-late Visean of Carboniferous to the end of Early Permian in accordance to the Geological Time Scale(Gradstein et al.,2004).Temporally,the plutons in the East and West Junggar formed in a period of 65 Ma,from 330 to 265Ma and from 340 to 275Ma,respectively.However,the plutonism in the East Junggar showed two peaks of 330 to 310Ma and 305 to 280Ma,whereas most plutons in the West Junggar were emplaced from 310 to 295Ma.Spatially,the plutonism occurred in all tectonic units separated by ophiolite belts and even some granitoid plutons intruded in ophiolites.Furthermore,the post-collisional plutons can be found not only in the Junggar,but also in the Altai orogenic belt to the north and in the Tianshan orogrnic belt to the south. |
| Keywords: | Late Paleozoic Post-collisional plutonism Continental crustal growth Junggar |
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