• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Asian earth sciences >Imprints of Archean to Neoproterozoic crustal processes in the Madurai Block, Southern India
【24h】

Imprints of Archean to Neoproterozoic crustal processes in the Madurai Block, Southern India

机译：印度南部马杜赖区块的太古代至新元古代地壳过程的印记

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

Madurai Block, the largest crustal block in the Southern Granulite Terrane (SGT) of Peninsular India, preserves the imprints of multistage tectonic evolution. Here, we present U-Pb and Hf isotope data on zircons from a charnockite-granite suite in the north-western part of this block. The oscillatory zoning, and the LREE to HREE enriched patterns of the zircons with positive Ce and negative Eu anomalies suggest that the zircon cores are of magmatic origin, with ages in the range of 2634-2435 Ma implying Neoarchean-Paleoproterozoic magmatism followed by subsequent metamorphism and protocontinent formation in the north-western part of the Madurai Block. A regional 550-500 Ma metamorphic overprint is also preserved in the zircons coinciding with the final amalgamation of the Gondwana supercontinent. The Hf iso-topic data suggest that the granite and charnockite were derived from isotopically heterogeneous juvenile crustal domains and the charnockites show a significant contribution of mantle-derived components. Therefore, the Hf isotopic data reflect mixing of crustal and mantle-derived sources for the generation of Neoarchean crust in the north-western Madurai Block, possibly in a suprasubduction zone setting during continent building processes.
机译：Madurai区块是印度半岛南部Granulite Terrane（SGT）中最大的地壳区块，保留了多阶段构造演化的烙印。在这里，我们展示了该区块西北部的一个方铁矿-花岗岩组中的锆石中的U-Pb和Hf同位素数据。具有正Ce和负Eu异常的锆石的振荡分区和从LREE到HREE的富集模式表明，锆石岩心是岩浆成因的，年龄在2634-2435 Ma范围内，这意味着新古宙-古古生代岩浆作用及其后的变质作用。和马杜赖区块西北部的原生大陆形成。锆石中还保留了区域550-500 Ma的变质叠印，与冈瓦纳超大陆的最终合并相吻合。 f同位素数据表明，花岗岩和菱镁矿均来自同位素异质的地壳区域，而菱镁矿显示出地幔衍生成分的显着贡献。因此，the同位素数据反映出地壳和地幔来源的混合，在西北部马杜赖区块（可能是在大陆建造过程中的超俯冲带环境中）生成了新太古代地壳。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
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