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秦岭-祁连造山带接合部位基性岩墙的LA-ICPMS锆石U-Pb年龄及地质意义
引用本文:陈隽璐,何世平,王洪亮,徐学义,曾佐勋,王宗起,闫全人.秦岭-祁连造山带接合部位基性岩墙的LA-ICPMS锆石U-Pb年龄及地质意义[J].岩石矿物学杂志,2006,25(6):455-462.
作者姓名:陈隽璐  何世平  王洪亮  徐学义  曾佐勋  王宗起  闫全人
作者单位:1. 中国地质大学,地球科学学院,湖北,武汉,430074;西安地质矿产研究所,陕西,西安,710054
2. 西安地质矿产研究所,陕西,西安,710054
3. 西安地质矿产研究所,陕西,西安,710054;西北大学,陕西,西安,710069
4. 中国地质大学,地球科学学院,湖北,武汉,430074
5. 中国地质科学院,地质研究所,北京,100037
基金项目:中国地质调查局资助项目
摘    要:基性岩墙群代表了陆壳伸展裂解事件,可为大陆再造及造山作用过程的动力学研究提供时间约束。本文利用LA-ICPMS方法对秦祁造山带接合部位陇山岩群中首次报道的基性岩墙群进行了锆石U-Pb同位素测年,获得440Ma左右的年龄。结合区域资料,认为在中央造山带中段可能普遍存在440Ma左右的一期伸展裂解事件。这一信息对中央造山带的构造演化及成矿地质背景研究具有重要地质意义。

关 键 词:秦岭-祁连造山带结合部位  基性岩墙群  早古生代
文章编号:1000-6524(2006)06-0455-08
收稿时间:2006-01-10
修稿时间:2006-01-102006-04-18

Zircon LA-ICPMS U-Pb age of mafic dykes in the area between the Qinling and the Qilian orogenic belts and its geological implications
CHEN Jun-lu,HE Shi-ping,WANG Hong-liang,XU Xue-yi,ZENG Zuo-xun,WANG Zong-qi,YAN Quan-ren.Zircon LA-ICPMS U-Pb age of mafic dykes in the area between the Qinling and the Qilian orogenic belts and its geological implications[J].Acta Petrologica Et Mineralogica,2006,25(6):455-462.
Authors:CHEN Jun-lu  HE Shi-ping  WANG Hong-liang  XU Xue-yi  ZENG Zuo-xun  WANG Zong-qi  YAN Quan-ren
Abstract:Mafic dykes represent a possible event of crustal break-off and can constrain the time of land-rebuilding and dynamics in this area. The authors found rome unreported mafic dykes in the Qinling and Longshan Groups between the Qinling and the Qilian orogenic belts. A 440 Ma U-Pb age was measured for these dykes using zircon LA ICPMS, which indicates that a regional extension might have occurred in the Qinling and the Qilian orogenic belts. The data is very important in the study of the evolution and mineralization of the Qinling and the Qilian orogenic belts.
Keywords:LA-ICPMS
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