内蒙石板井—小黄山与蛇绿岩相伴的变质岩及其演化

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。

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

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.