| 滩间山群的重新厘定-来自柴达木盆地边缘玄武岩年代学和地球化学证据 |
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| 引用本文： | 高晓峰,校培喜,贾群子.滩间山群的重新厘定-来自柴达木盆地边缘玄武岩年代学和地球化学证据[J].地质学报,2011,85(9):1452-1463. |
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| 作者姓名： | 高晓峰 校培喜 贾群子 |
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| 作者单位： | 西安地质矿产研究所,陕西,710054 |
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| 基金项目： | 中国地质调查局工作项目《昆仑-阿尔金成矿带基础地质综合研究》(编号1212010911025)资助的成果 |
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| 摘 要： | 柴达木盆地周缘滩间山群在岩石组合、玄武岩同位素年代学和地球化学特征以及在区域成矿过程中作用具有明显差异.柴北缘和柴南缘(东昆仑地区)滩间山群具有不同的岩石组合和沉积建造:柴北缘滩间山群下部为中基性海相火山岩,上部为碎屑岩-碳酸盐岩；柴南缘下部为中基性-中酸性火山岩夹碎屑岩,中部为碎屑岩夹中基性火山岩,上部为碳酸盐岩夹碎...
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| 关 键 词： | 地球化学 玄武岩 滩间山群 柴达木盆地 |
| 收稿时间： | 2010/3/29 0:00:00 |
| 修稿时间： | 2010/3/29 0:00:00 |
Redetermination of the Tanjianshan Group: Geochronological and Geochemical Evidence of Basalts from the Margin of the Qaidam Basin |
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| GAO Xiaofeng,XIAO Peixi,JIA Qunzi.Redetermination of the Tanjianshan Group: Geochronological and Geochemical Evidence of Basalts from the Margin of the Qaidam Basin[J].Acta Geologica Sinica,2011,85(9):1452-1463. |
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| Authors: | GAO Xiaofeng XIAO Peixi JIA Qunzi |
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| Institution: | GAO Xiaofeng,XIAO Peixi,JIA Qunzi(Xi'an Institute of Geology and Mineral Resources,Xi'an,710054) |
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| Abstract: | The Tanjianshan Group is widely distributed on the margin of the Qaidam basin, the Tanjianshan Group on the northern margin of the Qaidam basin composed of intermediate-basic volcanic rocks, classic rocks and carbonate rocks, whereas it composed of classic rocks , carbonate rocks, with small intermediate-basic and intermediate-acid volcanic rocks in East Kunlun (the southern margin of the Qaidam basin). The isotope geochronology and geochemical of basalts from the Tanjianshan Group are reported in this paper. previously the basalts in the northern margin of the Qaidam basin were formed between 510 and 460 Ma, LA-ICP-MS analyses that the zircon grains from basalts in East Kunlun have concordant U-Pb ages of (455 ± 13)Ma, the regional mapping of East Kunlun indicates the basalts were formed at 440Ma, so we consider these formed middle-Ordovician to early Silurian. Geochemical characteristics of basalts in the northern margin of the Qaidam basin indicate the tectonic attribute of an volcanic arc, the basalts in East Kunlun have similar geochemical characteristics to E-MORB lavas, which represent the remnants of fragmented oceanic crust of the Paleo-Qimantege ocean. |
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| Keywords: | Geochemical Basalt Tanjianshan Group Qaidam basin |
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