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| 内蒙中部白乃庙地区格林威尔岩浆事件记录：石英二长闪长岩脉锆石LA-ICP-MS U-Pb年龄证据 | |
| 引用本文： | 张华锋,周志广,刘文灿,李真真,章永梅,柳长峰.内蒙中部白乃庙地区格林威尔岩浆事件记录：石英二长闪长岩脉锆石LA-ICP-MS U-Pb年龄证据[J].岩石学报,2009,25(6):1512-1518. |
| 作者姓名： | 张华锋 周志广 刘文灿 李真真 章永梅 柳长峰 |
| 作者单位： | 1. 中国地质大学地质过程与矿产资源国家重点实验室,北京,100083;西北大学大陆动力学国家重点实验室,西北大学地质系,西安,710069 2. 中国地质大学地质过程与矿产资源国家重点实验室,北京,100083 3. 中国地质大学土地科学技术学院,北京,100083 |
| 基金项目： | 国家自然基金项目（40772122）和国土资源部地调局华北地区基础地质调查及数据更新项目（1212010811001） |
| 摘 要： | 本文主要报道内蒙古中部白乃庙地区侵入古生界徐尼乌苏组沉积地层中的石英二长闪长岩脉的锆石LA-ICP-MS 法U-Pb定年结果。测试结果显示大量锆石为捕获锆石并获得了从古元古代1.9Ga到中元古代1.26Ga左右的谐和年龄。其中中元古代年龄可划分为1.7Ga, 1.6~1.47Ga和1.26Ga等三个不同阶段；前两阶段年龄分别与华北克拉通化之后初始裂谷和非造山岩浆作用以及白云鄂博裂谷中火成碳酸盐的侵位时代相对应；而1.26Ga的年龄则与全球格林威尔构造-岩浆热事件时代相吻合。结果表明华北北缘存在中元古1.26Ga左右岩浆热事件。该结果为进一步认识华北北缘地壳演化及华北板块是否参与过罗迪尼亚超大陆演化提供了重要线索。 |
| 关 键 词： | LA-ICP-MS锆石年龄 格林威尔构造-热事件 白乃庙 内蒙 |
| 收稿时间： | 2008/10/30 0:00:00 |
| 修稿时间： | 2008/12/16 0:00:00 |
Grenvill tectono-thermal event record in the Bainaimiao area, Inner Mongolia, China:Evldence from zircon LA-ICP-MS U-Pb dating of quart monzodiorite dike |
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| ZHANG HuaFeng,ZHOU ZhiGuang,LIU WenCan,LI ZhenZhen,ZHANG YongMei and LIU ChangFeng.Grenvill tectono-thermal event record in the Bainaimiao area, Inner Mongolia, China:Evldence from zircon LA-ICP-MS U-Pb dating of quart monzodiorite dike[J].Acta Petrologica Sinica,2009,25(6):1512-1518. | |
| Authors: | ZHANG HuaFeng ZHOU ZhiGuang LIU WenCan LI ZhenZhen ZHANG YongMei and LIU ChangFeng |
| Abstract: | For LA-ICP-MS U-Pb dating, zircons are separated from a quartz monzodiorite dike that intruded in the Paleozoic sedimentary strata of the Xuniwusu Formation in the Bainaimiao area, Inner Mongolia. All zircon grains show clear internal structure of magmatic rhythmical zones by CL imagines, implying their magmatic genesis. As a result, zircon grains with various concordant U-Pb ages scattering between 1.9 and 1.26Ga, are suggest to be captured. The Meso-Proterozoic U-Pb ages recorded by the captured zircon grains can be grouped into three stages of 1.7, 1.6~1.47, and 1.26Ga, respectively. The former two stages are consistent with the time of initial rifting event taken place after the assemblagment of the North China craton (NCC) and an anorogenic magmatism of igneous carbonate in Bayan Obo rift, respectively. 7 out of 12 captured zircons yield U-Pb ages clot around 1.26Ga with 207Pb/206Pb weighted mean age of 1263±8Ma which is equivalent to the time of the globle Grenvill tectono-thermal event. The results of zircon U-Pb dating show that the 1.26Ga tectono-thermal event took place in northern margin of the NCC, which is significant for further study on crustal evolution of the NCC and provide an important clue for whether the NCC has been participated in the amalgmation of Rodinia. |
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