| 青藏高原羌塘盆地东部鄂尔陇巴组火山岩的锆石SHRIMP U—Pb年龄及其地质意义 |
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| 引用本文： | 付修根,王剑,谭富文,陈明,王进军,杜伯伟,陈文彬.青藏高原羌塘盆地东部鄂尔陇巴组火山岩的锆石SHRIMP U—Pb年龄及其地质意义[J].中国区域地质,2009(5):561-567. |
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| 作者姓名： | 付修根 王剑 谭富文 陈明 王进军 杜伯伟 陈文彬 |
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| 作者单位： | 中国地质调查局成都地质矿产研究所,四川成都610081 |
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| 基金项目： | 国家油气专项《青藏高原油气资源战略选区调查与评价》项目（编号：XQ2004-06）和国家自然科学基金（编号：40702020）资助.致谢：杨哲超、陈宁等同志在藏北无人区野外地质调查中给予大力帮助和后勤保障.在室内资料整理与分析过程中与朱弟成博士进行了有益的讨论,在此一并致以衷心的感谢. |
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| 摘 要： | 藏北羌塘盆地东部地区三叠系巴贡组之上沉积超覆了一套火山岩-火山碎屑岩．该套地层下部玄武岩的锆石SHRIMPu—Pb年龄明显可以分为2组，一组年龄相对年轻（220．4Ma±2．3Ma），代表了羌塘东部地区鄂尔陇巴组火山岩的喷发年龄；另外一组年龄相对较老（241．4Ma±3．6Ma），可能与中三叠世羌塘地区普遍存在的碰撞隆升事件有关。羌塘中生代（晚三叠世-早白垩世）盆地演化早期的沉积作用经历了由陆相至海相的超覆过程，沉积超覆作用从冲洪积相开始，伴随着岩浆侵入、火山爆发及火山碎屑沉积作用，总体上表现为一个向上变深的海侵序列，显示裂谷盆地的特征。
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| 关 键 词： | 锆石SHRIMP U-Pb年龄 沉积超覆 火山-沉积事件 鄂尔陇巴组火山岩 羌塘盆地东部 |
Zircon SHRIMP U-Pb age of volcanic rocks in E＇erlongba Formation,eastern part of the Qiangtang basin,Qinghai-Tibet Plateau,China and its geological significance. |
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| FU Xiu-gen,WANG Jian,TAN Fu-wen,CHEN Ming,WANG Jin-jun,DU Bai-wei,CHEN wen-bin.Zircon SHRIMP U-Pb age of volcanic rocks in E＇erlongba Formation,eastern part of the Qiangtang basin,Qinghai-Tibet Plateau,China and its geological significance.[J].Regional Geology of China,2009(5):561-567. |
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| Authors: | FU Xiu-gen WANG Jian TAN Fu-wen CHEN Ming WANG Jin-jun DU Bai-wei CHEN wen-bin |
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| Institution: | (Chengdu Institute of Geology and Mineral Resources, China Geological Survey, Chengdu 610081, Sichuan, China) |
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| Abstract: | A suite of volcanic rocks to volcaniclastic rocks overlie the Triassic E＇erlongba Formation in the eastern part of Qiangtang basin, northern Xizang, China. The SHRIMP zircon U-Pb ages of the lower basalt from this strata can be categorized into two groups： 220.4±2.3 Ma and 241.4±3.6 Ma respectively. The former represents magma emplacement age of the E＇erlongba Formation volcanic rocks in the eastern part of the Qiangtang basin region, while the latter is related to collision and upli~ events during Middle Triassic period. Early stage sedimentation of basin evolvement during Mesozoic went through an overlapping process from continental to marine facies, sedimentary overlap started from the alluvial/fluvial facies, along with intrusion, eruption and pyroclaistic sedimentation, reflecting a upward deepened transgression sequence, which indicates a rift basin. |
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| Keywords: | zircon SHRIMP U-Pb age sedimentary overlap volcanic-sedimentary event E＇erlongba Formation volcanic rock eastern part of the Qiangtang basin |
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