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Study on the Sr, Nd, Pb and O Isotopes of Basic Dyke Swarms in the Wudang Block and Basic Volcanics of the Yaolinghe Group

张成立 周鼎武 金海龙 韩松 刘颖宇

中国地球化学学报(英文版)2001，Vol.20Issue(3)：193-200,8.
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中国地球化学学报(英文版)2001，Vol.20Issue(3)：193-200,8.

Study on the Sr, Nd, Pb and O Isotopes of Basic Dyke Swarms in the Wudang Block and Basic Volcanics of the Yaolinghe Group

Study on the Sr, Nd, Pb and O Isotopes of Basic Dyke Swarms in the Wudang Block and Basic Volcanics of the Yaolinghe Group

张成立 1周鼎武 1金海龙 2韩松 3刘颖宇4

作者信息

  • 1. The Key Laboratory of Northwest University Continental Dynamics, Ministry of Education, Xi 'an 710069, China
  • 2. Department of Geography, Xinjiang Normal University, üriimqi 830054, China
  • 3. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100081, China
  • 4. Department of Geology, Northwest University, Xi' an 710069, China
  • 折叠

摘要

Abstract

The Sr, Nd and Pb isotopic characteristics of the Wudang basic dyke swarms and ba sic volcanics of the Yaolinghe Group show that they were derived from the same multi-compo nent mixing source in the mantle. The Wudang basic dyke swarms have (87Sr/86Sr)i = 0. 6905～0. 7061, εNd(t) = -- 1.9～5.0, △ 208Pb/204pb = 35.49 ～ 190.26, △ 207pb/204pb = 4 ～ 85,low Th/Ta and a wide range of La/Yb ratios; and the basic volcanics of the Yaolinghe Group have (87Sr/86 Sr)i = 0. 6487 ～ 0. 7075, εNd (t) = 0.11 ～ 3.94, △ 208 pb/204 Pb = - 81.58 ～219.95, △ 207pb/204pb = 4.44～16.68and higher Th/Ta and La/Yb ratios, indicating that their source is a mixture of DM and EMII, and the basic volcanics of the Yaolinghe Group were contaminated by crust materials en rout to the surface. Based on the geochemical features of continental tholeiitic basalts and being products of different facies derived from the same source,it can be concluded that an important rifting event in the South Qinling basement block oc-curred during Neoproterozoic, followed by a setting of oceanic basin in the Early Paleozoic.

关键词

basic dyke swarm/basic volcanies/isotope/geochemistry/Wudang block/Yaolinghe Group

Key words

basic dyke swarm/basic volcanies/isotope/geochemistry/Wudang block/Yaolinghe Group

分类

天文与地球科学

引用本文复制引用

张成立,周鼎武,金海龙,韩松,刘颖宇..Study on the Sr, Nd, Pb and O Isotopes of Basic Dyke Swarms in the Wudang Block and Basic Volcanics of the Yaolinghe Group[J].中国地球化学学报(英文版),2001,20(3):193-200,8.

基金项目

This research project was jointly supported by the Backbone Teacher Foundation of Ministry of Education, China and the Na tional Natural Science Foundation of China (Grant No. 49572145). （Grant No. 49572145）

中国地球化学学报(英文版)

2096-0956

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