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羌塘腹地新生代火山岩的地球化学特征与青藏高原隆升
引用本文:谭富文,潘桂棠,徐 强.羌塘腹地新生代火山岩的地球化学特征与青藏高原隆升[J].岩石矿物学杂志,2000,19(2):121-130.
作者姓名:谭富文  潘桂棠  徐 强
作者单位:国土资源部成都地质矿产研究所,成都,610082
基金项目:国土资源部 九五 "环境与资源重大科技攻关项目!(95 - 0 2 - 0 0 1)
摘    要:羌塘腹地新生代火山岩产出于青藏高原地壳向北减薄、地壳泊松比值向北发生异常增高的过渡地区。该区火山岩在藏北地区新生代火山岩中形成时代最老,为 4 4.1± 1.0Ma~32.6± 0.8Ma。岩石学及地球化学研究表明,区内新生代火山岩形成于大陆碰撞造山后的拉张环境,为壳源岩浆和幔源岩浆的混合产物。藏北高原的隆升与岩石圈地幔的拆离、地壳拉伸减薄及火山活动密切相关,由此推测藏北高原的主要隆升起始期为 4 0Ma左右。

关 键 词:新生代  火山岩  地球化学  青藏高原隆升
修稿时间:1999-11-03

The Uplift of Qinghai-Xizang Plateau and Geochemical Characteristics of Cenozoic Volcanic Rocks from the Center of Qiangtang, Xizang
Tan Fuwen,Pan Guitang,Xu Qiang.The Uplift of Qinghai-Xizang Plateau and Geochemical Characteristics of Cenozoic Volcanic Rocks from the Center of Qiangtang, Xizang[J].Acta Petrologica Et Mineralogica,2000,19(2):121-130.
Authors:Tan Fuwen  Pan Guitang  Xu Qiang
Abstract:The Cenozoic volcanic rocks at the center of Qiangtang are located in the area where the curst of Qianghai-Tibetan Plateau thins from south to north with an unusually concomitant increase of Paissons ratio. The ages of the volcanic rocks range from 44.1±1.0Ma to 32.6±0.8Ma, older than other rocks in northern Tibet. Petrological and geochemical studies suggest that the uniform elevation of northern Tibetan Plateau is closely related to the decoupling of the lithospheric mantle, crustal extension and thinning and volcanism. Therefore, the authors infer that the beginning of the main uplift of the northern plateau occurred at about 40 Ma ago.
Keywords:Tibet  Qiangtang  Cenozoic volcanic rocks  uplift
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