CCSD HP-UHP变质岩石英脉和东海水晶中有机包裹体的发现及其意义

Discovery of Organic Inclusions in Quartz Veins in CCSD HP-UHP Metamorphic Rocks and Donghai Crystals and Its Geological Implications

荧光显微镜下观察、激光拉曼和显微红外测试,首次在CCSDHP-UHP变质岩石英脉和东海水晶中发现了含有沥青和烃类的有机包裹体,进一步证实大别-苏鲁超高压变质带曾经历了快速的俯冲与折返过程,俯冲板块沉积物中的有机质未能充分地演化和成熟。俯冲板块在进变质过程中强烈脱水,释放出含烃流体,并被在板块抬升及其伴随的减压重结晶和退变质过程中形成的石英脉和水晶体所俘获。

Large amount of bitumen and hydrocarbon-bearing organic inclusions were recognized in quartz veins in HP-UHP metamorphic rocks from Chinese Continental Scientific Drilling（CCSD） and Donghai crystals by observation under fluoroscope and determination with Laser Raman and infrared spectroscopy, reconfirming that the Dabie-Sulu UHPM belt undergone rapid subduction and exhumation, thus the organic materials in the sediments in the subducted slab were not highly matured and transformed to kerogen or graphite. The hydrocarbon-bearing fluids were released during dehydration and prograde metamorphism, and were captured by quartz veins or crystals, which were deposited during plate exhumation and the subsequent pressure decline and retrograde metamorphism.