| 青藏高原西部喜马拉雅期花岗岩类特征及岩石系列 |
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| 引用本文： | 姜耀辉,杨万志.青藏高原西部喜马拉雅期花岗岩类特征及岩石系列[J].岩石矿物学杂志,2000,19(4):289-296. |
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| 作者姓名： | 姜耀辉 杨万志 |
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| 作者单位： | 国土资源部南京地质矿产研究所,南京,210016 |
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| 基金项目： | 原地质矿产部“九五”资源与环境科技攻关项目!(编号 :96 - 0 2 - 0 10 )资助 |
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| 摘 要： | 青藏高原西部喜马拉雅期花岗岩类岩石组合为透辉石正长岩－透辉石花岗岩－黑云母（二长）花岗岩，主要造岩矿物有钾长石、斜长石、石英、黑云母、透辉石和角闪石。岩石化学成分富碱、高钾、Ｋ２Ｏ／Ｎａ２Ｏ比值大，微量元素富集Ｒｂ，Ｓｒ、Ｂａ、Ｔｈ、Ｕ和ＬＲＥＥ，Ｓｒ、Ｎｄ同位素组成具有幔源特征，岩石属于钾玄岩（ｓｈｏｓｈｏｎｉｔｅ）系列。
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| 关 键 词： | 喜马拉雅期 花岗岩类 地球化学 钾玄岩 青藏高原 |
| 修稿时间： | 2000-01-06 |
Geochemical Characteristics and Rock Series of Himalayan Granitoids in Western Qinghai_Xizang Plateau |
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| Jiang Yaohui.Geochemical Characteristics and Rock Series of Himalayan Granitoids in Western Qinghai_Xizang Plateau[J].Acta Petrologica Et Mineralogica,2000,19(4):289-296. |
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| Authors: | Jiang Yaohui |
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| Abstract: | Himalayan granitoids in western Qinghai_Xizang plateau are distributed near the Taaxi-Hongshanhu suture. The rock assemblage is of diopside syenite-diopside granite-biotite (monzonitic) granite type. The rocks consist mainly of K_feldspar, plagioclase, quartz, biotite, diopside and hornblende. Chemical composition is characterized by rich alkali and high content of potassium with high value of K 2O/Na 2O, rich Rb, Sr, Ba, Th, U and LREE. Sr and Nd isotopic composition shows mantle characteristics. All these feature indicate that the rocks are of shoshonitic series. |
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| Keywords: | Himalayan granitoids geochemistry shoshonitic series western Qinghai_Xizang plate |
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