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 ,后又叠加了中高压变质作用 ,即经历过一反时钟PT轨迹。它的热高峰为 6 2 0℃ ,压力高峰近 0 .6 5GPa。
Both the andalusite cordierite hornfels typical of thermal metamorphism and the bluegreen hornblende 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.
出处
《高校地质学报》
CAS
CSCD
2001年第3期329-344,共16页
Geological Journal of China Universities
基金
国家自然科学基金 (编号 490 70 0 91)
高等学校重点实验室访问学者资助
