中生代华北岩石圈地幔高度化学不均一性与大陆岩石圈转型

周新华; 张宏福

中生代华北岩石圈地幔高度化学不均一性与大陆岩石圈转型

中国科学院地质与地球物理研究所北京 100029

基金项目:

国家自然科学基金重点项目 40334043

详细信息

作者简介:
周新华(1942-), 男, 研究员, 主要从事地幔地球化学和岩石圈深部演化研究.E-mail: xhzhou@mail.igcas.ac.cn

中图分类号: P581
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出版历程
- 收稿日期: 2005-12-03
- 刊出日期: 2006-01-25

Highly Chemical Heterogeneity of Subcontinental Lithosphere Mantle beneath North China and Its Major Transformation

Institule of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

摘要

摘要: 对当前我国固体地球科学热点之一的中国东部中生代大陆岩石圈地幔巨厚减薄的机制及地球动力学背景研究中所涉及的主要问题进行了简要的回顾和综述.基于华北地区系统的中生代深源岩类岩石地球化学研究, 着重论述了该区晚中生代岩石圈地幔的高度化学不均一性的表现及其成因分析, 进而强调了其可能的大地构造含义.其中, 特别对华北南部晚中生代深源岩类地幔源区地球化学特征的空间规律变异给予了详尽的讨论, 指出扬子板片的深俯冲作用及其导致的流体熔体交代是其主要的成因机制.建议以岩石圈地幔转型一词来描述中国东部大陆岩石圈地幔发生在中新生代的这一组成结构的剧烈变化, 并指出这一过程是由2次独立的事件所组成, 它们是中生代全球深部事件在中国东部不同形式的响应.
- 岩石圈地幔 /
- 地幔转型 /
- 中新生代 /
- 化学不均一性 /
- 中国东部
Abstract: This paper presents a review on the issues related to the mechanism and geodynamic regime of the Cenozoic-Mesozoic thinning of the subcontinental lithosphere beneath eastern China. The pattern and causes of highly chemical heterogeneity have been emphasized, and several tectonic implications have been postulated. It has been suggested that the major transformation of the subcontinental lithosphere beneath this region are composed of two separate events, which are regarded as a local response to the Mesozoic global event.
- lithosphere mantle /
- mantle transformation /
- Cenozoic-Mesozoic /
- chemical heterogeneity /
- eastern China

HTML全文

图 1 华北中生代岩石圈地幔高度化学不均一性(Zhang et al., 2004)

Fig. 1. Highly chemical heterogeneity of subcontinental lithospheric mantle beneath North China

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