| 郭家岭花岗岩的时代与成因 |
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| 引用本文： | 曲晓明,王鹤年.郭家岭花岗岩的时代与成因[J].地质找矿论丛,1995,10(3):24-32. |
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| 作者姓名： | 曲晓明 王鹤年 |
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| 作者单位： | 南京大学地球科学系 |
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| 摘 要： | 与前人的划分不同，本所指的郭家岭花岗岩只包括郭家岭和丛家两个岩体。由郭家岭岩体的５个全岩样品给出的Ｒｂ－Ｓｒ等时线年龄为２００．６±３．４８Ｍａ，（＾８７Ｓｒ／＾８６Ｓｒ）ｉ＝０．７１１２７、Ｒ＝０．９９９５５，表明该岩体支运动末期形成的。常量元素、微量元素及稀土元素表明该花岗岩是由壳幔物质混合形成的。
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| 关 键 词： | 郭家岭 花岗岩 壳幔混合 成因 |
| 收稿时间： | 1995/6/8 0:00:00 |
| 修稿时间： | 1995/7/13 0:00:00 |
THE AGE AND GENESIS OF GUOJIALING GRANITE |
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| Qu Xiaoming and Wang Henian.THE AGE AND GENESIS OF GUOJIALING GRANITE[J].Contributions to Geology and Mineral Resources Research,1995,10(3):24-32. |
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| Authors: | Qu Xiaoming and Wang Henian |
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| Institution: | Dedpartment of Earth sciences, Nanjing University;Dedpartment of Earth sciences, Nanjing University |
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| Abstract: | Different from the former classification this paper divides Guojialing Granite into Guojialing and Congjia bodies. 5 rock samples from Guojialing body gives a Rb-Sr isochron age of 200.6±3.48Ma, (87Sr/86Sr)1=0.71127, R=0.99955, Which shows that the granite formed in the end stage of Indosinian movement.Major, trace and rare earth elements all indicate that the granite formed from the mixing of crustal and mantle materials. The magmatism consists of two stages:the early granediorite constitutes the main part and the mixing ratio of crustal and mantle materials is 65:35;the late quartz diorite occurs as a smallstock in the Guojialing granodiorite body and its mixing ratio of crustal and mantle materials is close to 1:1 |
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