| 羌塘西北部松西地区康托组火山岩年龄及意义 |
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| 引用本文： | 钟华明,刘俊,童劲松,夏军,鲁如魁.羌塘西北部松西地区康托组火山岩年龄及意义[J].安徽地质,2008,18(2):92-94. |
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| 作者姓名： | 钟华明 刘俊 童劲松 夏军 鲁如魁 |
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| 作者单位： | 1. 安徽工业经济职业技术学院地质系,安徽,合肥,230051
2. 安徽省地质调查院,安徽,合肥,230001 |
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| 摘 要： | 羌塘西北部松西地区沿断陷盆地发育一套中性-酸性火山岩及火山碎屑岩，主要岩性包括安山岩和英安岩，是青藏高原隆升阶段在藏北地区伸展拉张作用的产物。安山岩^40Ar-^39Ar同位素年龄为36．42±0．93Ma。结合区域资料认为松西地区火山活动时代为古近纪始新世晚期一渐新世早期。火山岩年龄的确定不但制约了新生代沉积地层的年代，同时也为藏北地区陆内拉张时代的确定提供了依据。
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| 关 键 词： | 松西地区 火山岩 古近纪 同位素年龄 |
| 文章编号： | 1005-6157(2008)02-92-03 |
| 修稿时间： | 2007年12月17 |
AGE AND SIGNIFICANCE FOR THE VOLCANIC ROCKS OF CANTOR FORMATION SONGXI REGION IN NORTHWEST OF QIANGTANG |
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| Zhong Hua Ming,Liu Jun,Jin-Song Tong,Jun Xia,LU Ru-kui.AGE AND SIGNIFICANCE FOR THE VOLCANIC ROCKS OF CANTOR FORMATION SONGXI REGION IN NORTHWEST OF QIANGTANG[J].Geology of Anhui,2008,18(2):92-94. |
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| Authors: | Zhong Hua Ming Liu Jun Jin-Song Tong Jun Xia LU Ru-kui |
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| Institution: | Zhong Hua Ming 1,Liu Jun 2,Jin-Song Tong 2,Jun Xia 2,LU Ru-kui 2(1 Anhui industrial economy Vocational , Technical College,Hefei 230051 China,2 Institute of Geological Survey of Anhui Provence,Hefei 230001 China) |
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| Abstract: | A neutral - acidic volcanic rocks and volcaniclastic rocks were developed along the north-west rift basin of Qiangtang of Song Xi area, including the main lithologic andesite and dacite, is the products of stretching stage extension role of the uplift of the Qinghai-Tibet Plateau in northern Tibet region. Andesite isotope ^40Ar-^39Ar age is of 36.42 ± 0.93Ma, with information of the regional geological integration the era of ancient volcanic activity in Song Xi area is in late Eocene of Paleogene-early Oligocene. Volcanic age＇s determine not only restricted the formation age of Cenozoic sedimentary strata, but also provided a basis for the determination of stretching times of the intra continental in northern Tibet region |
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| Keywords: | volcanic rock Paleogene isotope Ages Song xi region |
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