| 祁连山西段金佛寺花岗岩基的地球化学
特征及成因探讨 |
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| 引用本文： | 赵文军,雒晓刚.祁连山西段金佛寺花岗岩基的地球化学
特征及成因探讨[J].甘肃地质学报,2008(2):30-34. |
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| 作者姓名： | 赵文军 雒晓刚 |
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| 作者单位： | 甘肃省地矿局第三地勘院 甘肃兰州730050 |
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| 基金项目： | 祁连西段1：250000区域遥感调查项目（DK0002019）资助. |
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| 摘 要： | 金佛寺岩体为祁连造山带中出露面积最大的复式深成岩体，根据研究所得的新资料，将其划分为8个单元，归并为一个序列，岩石化学表明金佛寺花岗岩序列属钙碱性过铝质岩系。δ值、NK／A值、A／NCK值、Eu负异常、δEu值、ACF图解、咚满比值、εSr、^147Sm／^144Nd比值、εNd值等均表明岩浆来源于地壳物质的重熔。具S型花岗岩特点，花岗岩中的Pb以放射性为特征。用颗粒级锆石U—Pb同位素定年龄为345．0±75．0Ma，综合分析得出该岩体属造山晚期花岗岩，将其时代确定为志留纪晚期。
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| 关 键 词： | 金佛寺花岗岩 单颗粒锆石U—Pb年龄 花岗岩成因 祁连山西段 |
THE AGE AND GENESIS OF JINFOSI GRANITE BATHOLITH IN
THE WESTERN SEGMENT OF QILIANSHAN MOUNTAINS |
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| ZHAO Wen-jun and LUO Xiao-gang.THE AGE AND GENESIS OF JINFOSI GRANITE BATHOLITH IN
THE WESTERN SEGMENT OF QILIANSHAN MOUNTAINS[J].Acta Geologica Gansu,2008(2):30-34. |
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| Authors: | ZHAO Wen-jun and LUO Xiao-gang |
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| Institution: | (No.3 Geology and Mineral Exploration Team, Gansu Provincial Bureau of Geology and Mineral Exploration and Development, Lanzhou 730050, China) |
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| Abstract: | Jinfosi granite is the largest complex pluton in the Qilian orogen. Based on the new data from some recent studies, this paper reports the age and genesis of Jinfosi granites in the western segment of Qilianshan orogen. This pluton can be divided into eight units and incorporated one sequence. Its petrographic and geochemical characteristics indicate that Jinfosi granite is calcium-alkalescence and extra-aluminium rocks. And its 8-NK/A,A/NCK,δEu,^87Sr/^86Sr,^147Sm/^144Nd,εSr,εNd and ACF-diagram all indicated that the magma came from the earth＇s crust and the granite is S-type granite, Pb in granite has character of radioactivity. Single-grained zircon U-Pb isotope analyses gave age of 345.0±75.0 Ma. The age of intrusion of Jinfosi granite was at late Silurian, the late of Calnedonian Qilian orogen. |
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| Keywords: | Jinfosi granite single-grained zircon U-Pb dating the genesis of granite the western segment of Qilian mountains |
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