| 海南岛中北部三叠纪花岗岩源区的锶、钕同位素制约及其意义 |
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| 引用本文： | 云平,雷裕红,吕嫦艳.海南岛中北部三叠纪花岗岩源区的锶、钕同位素制约及其意义[J].大地构造与成矿学,2005,29(2):234-241. |
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| 作者姓名： | 云平 雷裕红 吕嫦艳 |
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| 作者单位： | 海南省地质调查院,海南,海口,570206;中国地质大学,湖北,武汉,430074 |
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| 基金项目： | 中国地质调查局地质调查项目，中国地调局区域地质调查项目 |
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| 摘 要： | 海南岛中北部三叠纪花岗岩的锶、钕同位素初始比值分别为I(Sr)0. 7080 ~0. 71505、εNd(t) -10 ~-5,表明这些花岗岩属壳源型,其源岩主要为海南岛结晶基底中元古界抱板群,但受到了幔源岩浆的混染。这些花岗岩所表现出来的基本一致的锶、钕同位素特征,表明测区具有统一的前寒武纪基底。
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| 关 键 词： | 锶、钕同位素 花岗岩 海南岛 |
| 文章编号： | 1001-1552(2005)02-0234-08 |
| 修稿时间： | 2004年7月23日 |
SR AND ND ISOTOPIC CONSTRAINTS ON THE SOURCE REGIONS OF THE TRIASSIC GRANITOIDS IN CENTRAL- NORTHERN HAINAN ISLAND AND THEIR SIGNIFICANCE |
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| YUN Ping,LEI Yuhong,U Changyan.SR AND ND ISOTOPIC CONSTRAINTS ON THE SOURCE REGIONS OF THE TRIASSIC GRANITOIDS IN CENTRAL- NORTHERN HAINAN ISLAND AND THEIR SIGNIFICANCE[J].Geotectonica et Metallogenia,2005,29(2):234-241. |
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| Authors: | YUN Ping LEI Yuhong U Changyan |
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| Abstract: | The initial Sr and Nd isotope ratios for the intermediate-acid, crust-sourced granite in the central-northern part of Hainan Island in the Hercynian-Indosinian are I(Sr) 0.7080～0.71505 and ε_(Nd)(t)-10～-5. It is inferred in this paper that the source rock is mainly the Baoban group in the Mid-Proterozoic crystalline basement, which could be contaminated by mantle magma. The fact that the Sr and Nd isotope features show no remarkable difference indicates that a united Precambrian basement occurred in the surveyed area. |
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| Keywords: | Sr and Nd isotope granite Hainan Island |
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