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《Acta Scientiarum Naturalium Universitatis Pekinensis》 2009-03
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Mg-Carpholite Metapelite and Its Implications for Ancient Oceanic Subduction in the North Qilian Suture Zone,NW China

YU Xiaoning,SONG Shuguang,WEI Chunjing,ZHANG Lifei The Key Laboratory of Orogenic Belts and Crustal Evolution,Ministry of Education,School of Earth and Space Sciences,Peking University,Beijing 100871  
A typical Early Paleozoic oceanic suture zone,which consists of ophiolite,arc volcanic rocks and high-pressure low-temperature metamorphic rocks,occurs in the North Qilian Mountains,Northwestern China.Eclogite facies metapelites with index mineral assemblage of Mg-carpholite + garnet + chloritoid + phengite were studied in details in petrology and mineralogy.Using THERMORCAL(V3.23),the authors calculated the P-T conditions of the stability field for Carpholite(cr) + garnet(g) + chloritoid(ct) + phengite(ph) assemblage at P=2.2-2.5GPa and T=530-580℃.Based on the calculated stability fields of carpholite and chloritoid,the authors confirmed that the North Qilian suture zone was a "cold" oceanic subduction zone in Early Paleozoic time with geothermal gradients of 6.5-7.5℃/km,similar to Mesozoic-Cenozoic subduction zones.This study plays an important role in understanding the thermo-structure of the Early Paleozoic subduction zones and dehydration of HP metamorphic pelitic rocks.
【Fund】: 国家自然科学基金(40825007 40773012);; 全国优秀博士论文作者基金(200531)资助
【CateGory Index】: P588.3
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