内蒙石板井—小黄山与蛇绿岩相伴的变质岩及其演化

内蒙石板井—小黄山与蛇绿岩相伴的变质岩及其演化

周国庆1，陈小明1，赵建新1 2

1. 南京大学内生金属矿床成矿机制研究国家重点实验室，南京 210093; 2. 昆士兰大学地球科学系，澳大利亚4072

收稿日期:2001-09-20 修回日期:2001-09-20 出版日期:2001-09-20 发布日期:2001-09-20

The Metamorphic Rocks Associated with the Shibanjing-Xiaohuangshan Ophiolite from the Inner Mongolia Autonomous Region and Its Evolution History

ZHOU Guo-qing1, CHEN Xiao-ming1, ZHAO Jian-xin1;2

1. StateKey Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 210093, China; 2. Department of Earth Sciences, The University of Queensland, Brisbane Qld 4072, Australia

Received:2001-09-20 Revised:2001-09-20 Online:2001-09-20 Published:2001-09-20

摘要/Abstract

摘要： 在内蒙古石板井－小黄山蛇绿岩带发现了具典型热变质特征的红柱石堇青石角岩和以兰绿色角闪石、硬绿泥石、黑硬绿泥石等矿物代表的中高压区域变质角闪片岩。据变质作用时序和相拓朴图两个方面的研究，表明石板井和小黄山两地的变质岩属同一构造混杂岩，其中的变质岩先经过与火成作用有关的热变质作用，反又叠架了中高压变质作用，即经历过一反时钟PT轨迹。它的热高峰为620℃，压力高峰近0．65GPa。

Abstract: Both the andalusite- cordierite hornfels typical of thermal metamorphism and the bluegreen hoorblende schists typical of middle-high pressure regional metamorphism were found within the Shibanjing- Xiaohuangshan ophiolite belt, Inner Mongolia. Superimposed on the hornfelses are the later-stage middle-high pressure metamorphic minerals such as chloritoid and stilpnomenae. Our detailed metamorphism sequence and topological studies indicate that metamorphic rocks at Shibanjing and Xiaohuangshan are part of a tectonic melange. They experienced magmatically-induced thermal metamorphism, followed by a medium-high pressure metamorphism, which is characteristic of an anti-clockwise PT trajectery with maximum T=620℃ and maximum P=0.65Gpa.

周国庆，陈小明，赵建新. 内蒙石板井—小黄山与蛇绿岩相伴的变质岩及其演化[J]. J4.

ZHOU Guo-qing1, CHEN Xiao-ming1, ZHAO Jian-xin1;2. The Metamorphic Rocks Associated with the Shibanjing-Xiaohuangshan Ophiolite from the Inner Mongolia Autonomous Region and Its Evolution History[J]. J4.