陕西勉县地区关帝坪闪长岩体的LA-ICP-MS锆石U-Pb年龄及其地质意义

吴美玲; 郭永峰; 李学军

陕西勉县地区关帝坪闪长岩体的LA-ICP-MS锆石U-Pb年龄及其地质意义

西北大学地质学系, 西北大学大陆动力学国家重点实验室, 陕西西安 710069

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- 收稿日期: 2008-06-20
- 修回日期: 2008-03-12
- 发布日期: 2009-03-04

Zircon LA-ICP-MS U-Pb Dating of the Guandiping Diorite Pluton from Mianxian, South Qinling, Central China

State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China

摘要

摘要: 秦岭造山带印支期花岗岩的成因研究是当前秦岭造山带研究的热点问题.通过对出露于陕西勉县地区勉略缝合带中光头山岩体西端的关帝坪黑云母闪长岩锆石LA-ICPMSU-Pb年代学研究,探讨其地质意义.岩石主要由斜长石、角闪石和黑云母组成,蚀变较轻.LA-ICP-MS锆石U-Pb测年得到的加权平均年龄为220.5±3.1Ma(MSWD=0.66,2σ),代表该闪长岩体的结晶年龄.该年龄与附近的光头山黑云母斜长花岗岩的年龄216±2Ma很接近,由此推断两者应产出于相同的构造背景.结合前人研究结果,推断该黑云母闪长岩体可能为勉略洋闭合后的碰撞后期产物.
- 勉略带 /
- 闪长岩 /
- 关帝坪闪长岩体 /
- LA-ICP-MS锆石U-Pb定年
Abstract: The Guandiping biotite diorite outcrops in the Mianlue suture zone, located in the western part of the Guangt oushan granite pluton. The biotite diorite is mainly consisted by plagioclase, bhrnblende and biotite, with slightalt eration. LA-ICP-MS dating of zircon U-Pb yeilds a weighted meanage of 220.5Ma ±3.1Ma (MSWD)=0.66, 2σ), which is considered representing the crystal lizing age of the Guandiping diorite pluton. This age is similar with the emplacement age of the biotite-plagioclase granite (216Ma±2Ma) from the Guang to ushan Pluton in the surroundings, it can be inferred that the Guandiping biotite diorite pluton was formed in post-collisio nalsetting.
- Mianlue structure zone /
- diorite /
- Guandiing diorite Pluton /
- LA-ICP-MS zircon U-Pb dating

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陕西勉县地区关帝坪闪长岩体的LA-ICP-MS锆石U-Pb年龄及其地质意义

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Zircon LA-ICP-MS U-Pb Dating of the Guandiping Diorite Pluton from Mianxian, South Qinling, Central China

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