首页> 外文期刊>American Journal of Science >LATE NEOARCHEAN SUPRACRUSTAL ROCKS FROM THE ANSHAN-BENXI TERRANE, NORTH CHINA CRATON: NEW GEODYNAMIC IMPLICATIONS FROM THE GEOCHEMICAL RECORD
【24h】

LATE NEOARCHEAN SUPRACRUSTAL ROCKS FROM THE ANSHAN-BENXI TERRANE, NORTH CHINA CRATON: NEW GEODYNAMIC IMPLICATIONS FROM THE GEOCHEMICAL RECORD

机译:来自鞍山 - 本溪地区的鞍山 - 本溪地区的晚期新墓地克拉顿:来自地球化学纪录的新地磁效应

获取原文
           

摘要

The late Neoarchean supracrustal rocks of the Anshan-Benxi (AnBen) terrane in the northeastern part of the North China Craton (NCC) have important regional tectonostratigraphic implications for the development of large-scale banded iron formations (BIFs). These supracrustal rocks underwent polyphase deformation and upper greenschist to upper amphibolite facies metamorphism and are subdivided into two main lithotectonic units in terms of differing ages, metamorphic grades, and lithological assemblages: the Benxi unit (similar to 2.56 - 2.53 Ga) composed of tholeiitic to transitional mafic rocks with minor siliciclastic sedimentary rocks, and the Anshan unit (similar to 2.53-2.51 Ga) consisting of siliciclastic sedimentary rocks with minor tholeiitic mafic rocks. In this study, we report the results of field investigations and petrographic, whole-rock major and trace element geochemical and Sm-Nd isotopic analyses, as well as zircon U-Pb-Hf-O isotopic analyses for these volcano-sedimentary rocks, and integrate the results with previously published data to provide a new geodynamic synthesis for the setting of the BIFs.
机译:鞍山 - 本溪(ANBEN)地区东北部的晚期新的Supracrustal岩石在华北地区(NCC)中具有重要的区域构造与图形对大型带状铁形成(BIFS)的影响。这些Supractal岩石接受了多相变形和上砂根师的上部倒角,在不同的年龄,变质等级和岩性组合方面被细分为两个主要的碎石单位:Benxi单元(类似于2.56 - 2.53 Ga)由烟草组成具有少数矽肺泥土岩的过渡炸玉米岩,与鞍山单位(类似于2.53-2.51 Ga),由硅砾沉积岩,与少数墓岩麦克风岩。在这项研究中,我们报告了现场调查和岩体,全岩主要和痕量元素地球化学和SM-ND同位素分析的结果,以及这些火山沉积岩石的锆石U-PB-HF-O同位素分析将结果与先前已发布的数据集成,以提供用于设置BIF的新的地磁合成。

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