| 云南个旧老厂-卡房花岗岩体成因：锆石U-Pb年代学和岩石地球化学约束 |
| |
| 引用本文： | 程彦博,毛景文.云南个旧老厂-卡房花岗岩体成因：锆石U-Pb年代学和岩石地球化学约束[J].地质学报,2008,82(11):1478-1493. |
| |
| 作者姓名： | 程彦博 毛景文 |
| |
| 作者单位： | 中国地质大学（北京）,中国地质科学院矿产资源研究所 |
| |
| 基金项目： | 国家重点基础研究发展计划（973计划） |
| |
| 摘 要： | 在云南个旧地区发育大量与成矿时空密切相关的侵入岩。个旧东区的老厂-卡房花岗质岩体为一隐伏的花岗岩体，侵入于三叠纪个旧组灰岩和碳酸盐地层中，岩性主要为中细粒黑云母花岗岩，是个旧地区与成矿关系最为密切的花岗岩体之一。岩石的ACNK值大多在1.0以上，属于高钾钙碱性系列岩石；U、Th含量较高，应归属于HHP花岗岩；岩石类型属于S型花岗岩，但经历了高度的分异和演化；n(Rb)/n(Sn)- n(Rb)/n(Ba)与n(CaO)/n(Na2O)-n(Al2O3)/n(TiO2)图解均暗示岩石的源区性质为由粘土岩所派生的岩浆。锆石LA-ICP-MS定年结果表明，老厂-卡房岩体形成于85±0.85Ma，相当于晚白垩世。根据区域地质和花岗岩的地球化学特征，暗示个旧地区燕山晚期处于伸展构造背景。
|
| 关 键 词： | 老卡岩体 地球化学 锆石U-Pb年龄 岩石成因 云南个旧 |
| 收稿时间： | 2008/7/16 0:00:00 |
| 修稿时间： | 2008/7/16 0:00:00 |
Prelimarny study of the petrogenesis of Laochang-Kafang granite in the Gejiu area, Yunnan province: Constraints from geochemistry and zircon U-Pb dating |
| |
| Cheng Yanbo and Mao Jingwen.Prelimarny study of the petrogenesis of Laochang-Kafang granite in the Gejiu area, Yunnan province: Constraints from geochemistry and zircon U-Pb dating[J].Acta Geologica Sinica,2008,82(11):1478-1493. |
| |
| Authors: | Cheng Yanbo and Mao Jingwen |
| |
| Institution: | China University of Geosciences,Institute of Mineral Resources,Chinese Academy of Geological Sciences |
| |
| Abstract: | Including the granite stocks, a series of igneous rocks during the Mesozoic developed in Gejiu area, Yunnan province.This essay aims at the Laochang-Kafang granites stocks. Combination with the local geological settings, geological features and petrologic characteristics of the stock ,by means of geochemical testing and LA-ICP-MS, the research indicate that the figure of ACNK are over 1.0 and the content are all very high, so Laoka granite belongs to shoshonitic and HHP granite. The granite is S-type granite and experienced high differentiations and evolution. The diagram of n(Rb)/n(Sn)vs. n(Rb)/n(Ba) and (CaO)/n(Na2O)vs.n(Al2O3)/n(TiO2) all indicate Laoka granite originated from the magma formed by argillite rocks.The result of dating shows that the emplacement age is 85±0.85Ma, as the data of forming age and spatial distribution are obviously different from the late granite formed in Yanshanian in cathaysia block, a further speculate on the geo-tectonic setting of this area is it may influenced by both tethyan tectonic domain and pacific tectonic domain. |
| |
| Keywords: | Laoka granite geochemistry zircon U-Pb dating petrogenesis Gejiu area of Yunnan province |
| 本文献已被 维普 等数据库收录！ |
| 点击此处可从《地质学报》浏览原始摘要信息 |
| 点击此处可从《地质学报》下载免费的PDF全文 |
