• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Geology Review >First discovery of a Palaeoproterozoic A-type granite in southern Wuyishan terrane, Cathaysia Block: evidence from geochronology, geochemistry, and Nd-Hf-O isotopes
【24h】

First discovery of a Palaeoproterozoic A-type granite in southern Wuyishan terrane, Cathaysia Block: evidence from geochronology, geochemistry, and Nd-Hf-O isotopes

机译：第一次发现武夷山南部武夷山地区南部的古典古代A型花岗岩：来自地理学，地球化学和ND-HF-O同位素的证据

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this study, a combined study of zircon U-Pb and Hf-O isotopes, as well as whole-rock major and trace elements and Nd isotopes has been conducted for Yangjia gneissic granite from the southern Wuyishan terrane, Southeast China, to constrain its petrogenesis and provide a new window for investigating the tectonic evolution of the Cathaysia basement. U-Pb dating for magmatic zircons yields a Pb-207/Pb-206 age of ca. 1.80 Ga, interpreted as the emplacement age of the Yangjia granite. The granites have relatively high K2O, Rb, Ga, Zr, Nb, Y, and Ce contents and show low Al2O3, CaO, and Ba concentrations. Their 10,000* Ga/Al ratios range between 2.8 and 3.2. Zircons from the granite have epsilon(Hf)(t) values ranging from -13.2 to -7.2, corresponding to T-DM2(Hf) model ages of 2.99 Ga to 2.72 Ga. The zircon delta O-18 values range between 6.7% and 9.1% with an average of 7.7%. In addition, the whole-rock epsilon(Nd)(t) values of the granites range from -6.5 to -5.4 and the T-DM2(Nd) model ages from 2.73 Ga to 2.82 Ga. All these geochemical and Nd-Hf-O isotopic signatures suggest an A-type affinity for the Yangjia granites, and they were likely generated by partial melting of Palaeoproterozoic parametamorphic rocks of the Wuyishan terrane in a post-collisional extensional setting. When our data is combined with existing geochronological data, it provides further evidence for the Palaeoproterozoic basement in the southern Wuyishan terrane, which records a rapid tectonic transition from post-collision to intraplate extension (1.80-1.77 Ga) related to the break-up of the supercontinent Columbia.
机译：在这项研究中，对武夷山地区南部南方南部的杨嘉神社花岗岩进行了锆U-Pb和HF-O同位素的组合研究，并对中国南部南部的阳佳神爱花岗岩进行了限制纤维化和提供了一种用于调查CAMADYIA地下室构造演进的新窗口。岩浆氧化锆的U-PB约会产生PB-207 / PB-206年龄。 1.80 GA，被解释为阳佳花岗岩的施加年龄。花岗岩具有相对高的K 2 O，RB，Ga，Zr，Nb，Y和Ce含量，显示出低Al2O3，CaO和Ba浓度。他们的10,000 * GA / Al比率在2.8和3.2之间。来自花岗岩的锆石具有-13.2至-7.2的ε（hf）（t）值，对应于2.99ca至2.72 ga的T-DM2（HF）模型年龄。锆石Delta O-18值范围在6.7％之间9.1％，平均为7.7％。此外，花岗岩的全岩ε（nd）（t）值范围为-6.5至-5.4和t-dm2（nd）模型从2.73 ga到2.82 ga。所有这些地球化学和nd-hf- o同位素签名表明对阳报花岗岩的A型亲和力，它们可能是在碰撞后延伸环境中武夷山地区的古典古代群体岩石的部分熔化产生。当我们的数据与现有的地理学期数据相结合时，它为武夷山南部南部的古典型古怪地下室提供了进一步的证据，该地下室在与分手的分手相关的内部碰撞（1.80-1.77 GA）的碰撞后的快速构造过渡超大哥伦比亚。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号