山东胶南隆起长英质岩石超高压高压岩石特征及其P—T演化
FEATURES OF ULTRAHIGH AND HIGH PRESSURE FELSIC ROCKS IN THE JIAONAN UPLIFT,SHANDONG, AND THEIR P T EVOLUTION
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摘要: 胶南隆起含榴辉岩高压变质带为大别超高压带的东延部分。超高压变质作用的主要矿物共生组合为Ｇｒｔ＋Ｋｙ＋Ｒｕｔ＋Ｊｄ＋Ｑ；Ｓｐ＋Ｚｏ＋Ａｂ±Ｇｒｔ±Ｏｍｐ；变质作用的温压条件为Ｔ＝６００～７００℃，Ｐ＝２３～２６ＧＰａ。超高压岩石及高压岩石均经历了两期退变质作用，且具有相似的顺时钟Ｐ—Ｔ演化轨迹。Abstract: The eclogite bearing high pressure metamorphic belt in the Jiaonan uplift is the eastward extension of the Dabie ultra high pressure belt.The principal mineral associations of ultra high metamorphism are Grt+Ky+Rut+Jd+Q and Sp+Zo+Ab±Grt±Omp,and the P T conditions of metamorphism are T =600～700 ℃ and P =2.3～2.6 GPa.The ultra high pressure rocks and high pressure rocks both underwent two phases of retrogressive metamorphism and have similar clockwise P T paths.
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