Zircon U-Pb Age of Tonghualing Inter mediate-Acid Intrusive Rocks, Eastern Junggar, Xinjiang

Acta Scientiarum Naturalium Universitatis Pekinensis

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Zircon U-Pb Age of Tonghualing Inter mediate-Acid Intrusive Rocks, Eastern Junggar, Xinjiang

GUO Lishuang^1,3, ZHANG Rui², LIU Yulin¹, XU Fajun², SULi⁴

1.The Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871; 2.Xinjiang Geological Institute of Nonferrous Geoexploration Bureau, Urumqi 830000; 3. Key Laboratory of Western China's Environmental Systems of the Ministry of Education,Lanzhou 730000; 4. The Geological Lab Center, China University of Geosciences, Beijing 100083;

Received:2008-10-31 Online:2009-09-20 Published:2009-09-20

新疆东准噶尔铜华岭中酸性侵入体锆石U-Pb年代学研究

郭丽爽^1,3,张锐²,刘玉琳¹,许发军²,苏犁⁴

1. 造山带与地壳演化教育部重点实验室,北京大学地球与空间科学学院, 北京100871; 2.新疆有色地质勘查局地质研究所, 乌鲁木齐830000; 3.兰州大学西部环境教育部重点实验室, 兰州730000; 4.中国地质大学北京地学实验中心, 北京100083;

Abstract

Abstract: Tonghualing intermediate-acid intrusive rocks is located in Yemaquan arc between Armantai fault and Kelameili fault, Eastern Junggar, North Xinjiang. The intermediate-acid intrusive rocks are principally composed of diorite-porphyry, tonalite and monzogranite. Zircons fromthese rocks are dated using LA-ICP-MS U-Pb method and yield weighted mean ²⁰⁶Pb/₂₃₈U age of 427.4±3.2, 422.8±3.2 and 418.5±2.6 Ma respectively, indicating that there are Early Paleozoic magmatic activities in Eastern Junggar. This work supplies evidence for orogenic evolution in Early Paleozoic in this area.

Key words: Eastern Junggar, Tonghualing intermediate-acid intrusive rocks, zircon, U-Pb chronology

摘要： 伊吾县铜华岭中酸性侵入体位于新疆北部东准噶尔阿尔曼太断裂和克拉麦里断裂之间的野马泉岛弧区, 岩性主要为闪长玢岩、英云闪长岩和二长花岗岩等。通过锆石LA-ICP-MS U-Pb年代学方法, 对这3种岩性进行精确定年, 其²⁰⁶Pb/₂₃₈U的加权平均年龄分别为427.4±3.2,422.8±3.2和418.5±2.6Ma,说明铜华岭岩体是早古生代岩浆活动的产物, 为东准噶尔早古生代造山带演化提供了花岗岩证据。

关键词: 东准噶尔, 铜华岭岩体, 锆石, U-Pb年代学

CLC Number:

P588
P597

GUO Lishuang,ZHANG Rui,LIU Yulin,XU Fajun,SULi. Zircon U-Pb Age of Tonghualing Inter mediate-Acid Intrusive Rocks, Eastern Junggar, Xinjiang[J]. Acta Scientiarum Naturalium Universitatis Pekinensis.

郭丽爽,张锐,刘玉琳,许发军,苏犁. 新疆东准噶尔铜华岭中酸性侵入体锆石U-Pb年代学研究[J]. 北京大学学报（自然科学版）.

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Zircon U-Pb Age of Tonghualing Inter mediate-Acid Intrusive Rocks, Eastern Junggar, Xinjiang

新疆东准噶尔铜华岭中酸性侵入体锆石U-Pb年代学研究

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