| 博格达裂谷闭合和区域隆起的同位素年代学证据及地质意义 |
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| 关键词:Dashitou-Sepikou rhyolites Rb-Sr age Sr isotopic geochemistry Bogda rift closure and regional uplift |
| 基金项目:本文为国家自然科学基金项目（编号：40472042,40072075)、国家重点基础研究发展规划项目（编号:2001CB409802)、国家“九五”攻关305项目（编号：96-915-05-03-01）和中国百人人才计划（CAS Hundred TaientsProject）合作研究成果，并得到南京大学开放测试基金（编号：0303Y302-2004)资助。 |
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| Isotopic Chronologic Evidence of Bogda Rift Closure and Regional Uplift and Its Geological Significance |
| The Bogda Mountain, with Junggar basin on the north and Turpan-Hami basin on the south, is a part of the East Tianshan Mountains. The Rb-Sr isotope age and the 86Sr/88Sr ratio of ten rhyolite samples from the Dashitou-Sepigou belt are 307.1±1. 3 Ma and 0. 703296±32，respectively. The age data indicate that the volcanic activities of Bogda area lasted from Early and Middle Carboniferous to Late Carboniferous, and also imply that the age can be regarded as the age of Bogda rift closure and regional uplift. Sr isotopes of the rhyolites suggest that the volcanic rocks were chiefly derived from the depleted mantle source. Such a characteristic of rhyolites is very rarely seen. |
| WANG Yinxi,GU Lianxi,ZHANG ZUnzhong,ZHANG Kaijun,LI Huimin,WU Changzhi,YANG Jiedong.2005.Isotopic Chronologic Evidence of Bogda Rift Closure and Regional Uplift and Its Geological Significance[J].Acta Geoscientica Sinica,26(z1):102-104. |
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