| 青海柴北缘红铁沟地区基性岩脉锆石U-Pb测年、地球化学特征及地质意义 |
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| 引用本文： | 刘立保,张新远,张志青.青海柴北缘红铁沟地区基性岩脉锆石U-Pb测年、地球化学特征及地质意义[J].中国科技信息,2014(9):40-43. |
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| 作者姓名： | 刘立保 张新远 张志青 |
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| 作者单位： | [1] 青海省第三地质矿产勘查院,青海西宁810029 [2] 青海省地质调查院,青海西宁810012 |
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| 基金项目： | 中国地质调查局地质大调查项目（1212010040111） |
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| 摘 要： | 柴北缘红铁沟地区发现的北西-南东向基性岩脉,侵入于南华一震旦纪全吉群中。对辉绿岩进行了LA-MC-ICP-MS锆石U-Pb测年,获得年龄为234±14Ma,时代中三叠世。岩石化学和地球化学表明,基性岩脉为上地幔部分熔融的产物,基性岩浆的分异演化未受陆壳物质混染。红铁沟地区基性辉绿岩脉的发现,进一步证明了在中三叠世该地区经历了多次强烈挤压碰撞及其之间的相对松弛伸展,为柴北缘红铁沟地区的构造岩浆旋回演化过程提供了重要的地质信息。
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| 关 键 词： | 柴北缘 U-Pb测年 基性岩脉 伸展环境 |
Zircon U-pb dating of mafic dikes and geochemical features and significance in hongtiegou area in northern qaidam in qinghai |
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| Liu Libao,Zhang Xinyuan,Zhang Zhiqing.Zircon U-pb dating of mafic dikes and geochemical features and significance in hongtiegou area in northern qaidam in qinghai[J].CHINA SCIENCE AND TECHNOLOGY INFORMATION,2014(9):40-43. |
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| Authors: | Liu Libao Zhang Xinyuan Zhang Zhiqing |
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| Institution: | 1.N0. 3 Geological and Mineral Reesources Survey Institute, Xining, qinghai, 810012. 2. Qinghai Geological Survey Institute, Xining, Qinghai, 810012) |
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| Abstract: | The NW-SE trending mafic dikes which are found in Hongtiegou area in northern Qaidam intrude into the Quanji Group of Nanhua-Sinian period. 234±14Ma in the Middle Triassic Epoch is found after LA-MC-ICP-MS Zircon U-pb dating of diabases. The petrochemistry and geochemistry show that the marie dikes are the products of partial melting of upper mantle and the differentiation of basic magma is not contaminated by continental substances. The discovery of diabase mafic dikes in Hongtiegou area further proves that this area goes through fierce extrusion and collision, as well as relative relaxation and extension in strongly collided and slided in the Middle Triassic Epoch, which provides significant geological information for the multi-cycle process of tectonomagmatic in Hongtiegou area in Northern Qaidam. |
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| Keywords: | Northem Qaidam U-pb dating mafic dikes extension environment |
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