南淮阳高压—超高压变质地体的变质作用特征及其P—T—t轨迹

南淮阳高压—超高压变质地体是秦岭—大别碰撞造山带的一个重要组成部分，这里不仅广泛发育着蓝片岩、高压榴辉岩、超高压榴辉岩和具有由南向北渐次展布的空间分布结构，而且还有一系列同斜褶皱、逆冲断层和强烈构造形变作为同变质期的主要构造特征。其间高压—超高压变质形成于中朝、扬子大陆碰撞对接阶段，而在构造抬升时期则有强烈的退化变质发生，它们共同组成一条顺时针型Ｐ—Ｔ—ｔ轨迹，反映了南淮阳—超高压变质地体的变质作用特征及其与构造演化的相互关系。

METAMORPHIC CHARACTERISTICS &P-T-t PATHS OF THE HIGH-ULTRAHIGH PRESSURE METAMORPHIC TERRANE IN SOUTHERN HUAIYANG

The high-ultrahigh pressure metamorphic terrane in Southern Huaiyang is one of the importent components in Qinling-Dabie collision orogenic belt, in which not only are blueschists, high and ultrahigh pressure eclogites widely developed and distributed gradually from south to north in spatial, but also there are series of isoclinal folds, thrusts which are considered as the major features of syn-metamorphic epoch.The high-ultrahigh pressure metamorphism took place in the collision stage between the Sino-Korean and Yangtze cotments and the retrogrssive metamorphism occured in the tectonic uplifting phase, which commonly composed a clockwise P-T-t path representing the metamorphic characteristics of the high - ultrahigh pressure metamorphic terrane in Southern Huaiyang and the mutual relations with the tectonic evolution.