| 我国一些碱性岩的同位素年代学研究 |
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| 引用本文： | 周玲棣 赵振华. 我国一些碱性岩的同位素年代学研究[J]. 地球化学, 1996, 25(2): 164-171 |
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| 作者姓名： | 周玲棣 赵振华 |
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| 作者单位： | 中国科学院广州地球化学研究所 |
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| 摘 要： | 对我国七个碱性岩体用一种或两种方法进行了年龄测定。Ｒｂ－Ｓｒ测定了岩石及微斜长石；４０Ａｒ－３９Ａｒ法测定了闪石、辉石、正长石及微斜长石；超基性碱性岩用Ｓｍ－Ｎｄ等时线法测定。各岩体年龄分别为：坪河４６２Ｍａ，赛马２４４Ｍａ，柏林川２１８Ｍａ，紫金山１５３Ｍａ，龙王庙１５０Ｍａ，丫髻山１２７．５Ｍａ，永胜３１．７Ｍａ，Ｉｓｒ为０．７０４４－０．７０８３。已获得的Ｓｒ、Ｎｄ同位素数据表明，碱性岩浆
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| 关 键 词： | 碱性岩 Rb－Sr法 氩40－氩39 同位素年代学 |
ISOTOPIC CHRONOLOGY OF SOME ALKALINE ROCK BODIES IN CHINA |
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| Zhou Lingdi,Zhao Zhenhua,Zhou Guofu. ISOTOPIC CHRONOLOGY OF SOME ALKALINE ROCK BODIES IN CHINA[J]. Geochimica, 1996, 25(2): 164-171 |
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| Authors: | Zhou Lingdi Zhao Zhenhua Zhou Guofu |
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| Abstract: | Seven alkaline rock bodies in China show various petrologic features and rock associations and all are controlled by deep fractures.The ages of them have been determined by Rb-Sr,40Ar-39Ar or Sm-Nd dating methods,they are as follows:Pinghe 462Ma,Saima 244Ma,Bailinchuan 218Ma,ZiJinshan 153Ma,Longwangmiao 150Ma, Yajishan 127Ma,Yongsheng 31.7Ma.The Isr of them ranges from 0.704 to 0.708.The Sr and Nd isotopic characteristics show that the alkaline magmas are derived from the mantle.The alkaline rock bodies belong to mantle source type or mantle-crust mixed type. |
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