首页> 中文期刊> 《资源调查与环境》 >福建东山亲营山岩组变质岩石榴石-黑云母地质温度计的应用

福建东山亲营山岩组变质岩石榴石-黑云母地质温度计的应用

         

摘要

福建东山苏峰山地区亲营山岩组含石榴石、黑云母和白云母.亲营山岩组原岩为泥质岩, 经历了岩片俯冲、深埋挤压和逆冲3个构造-变质作用阶段, 分别形成俯冲岩片 (Ⅰ) 、深埋挤压岩片 (Ⅱ) 和逆冲岩片 (Ⅲ) .俯冲阶段为中温低压变质作用, 深埋挤压阶段为高温中压进变质作用, 逆冲阶段为高温低压退变质作用.石榴石、黑云母和白云母为主要变质矿物, 均为无环带的均一矿物.选取相邻石榴石和黑云母矿物对作为地质温度计, 结合白云母地质压力计, 估算俯冲阶段温度为594~622℃, 压力为0. 28~0. 52 GPa;深埋挤压阶段温度为629~655℃, 压力为0. 6~0. 7 GPa;逆冲阶段温度为476~495℃, 压力为0. 09~0. 1 GPa.%The Qinyingshan Formation in the Sufengshan area of Fujian Province consists of garnet, biotite and muscovite. The study shows that the protolith of the Qinyingshan Formation is mainly argillaceous rocks, which experienced rock slices subduction, deep buried squeezing and thrusting, forming subduction rock slices (Ⅰ), deep buried squeezing rock slices (Ⅱ) and thrusting rock slices (Ⅲ) respectively. Among them, the subduction stage was middle-temperature and low-pressure metamorphism, the deep buried squeezing stage was high-temperature and middle-pressure prograde metamorphism, and the thrusting stage was high-temperature and low-pressure retrograde metamorphism. The main metamorphic minerals are garnet, biotite and muscovite, all of which have no girdle zone.Garnet and biotite from the samples of three rock slices mentioned above were used as a geothermometer. Combined with muscovite geobarometer, it can be estimated that, during the tectonic evolution processes of metamorphic rocks, the temperatures and pressures of the subduction stage, the deep buried squeezing stage and the thrusting stage were estimated 594 ~ 622 ℃ and 0. 28 ~ 0. 52 GPa, 629 ~ 655 ℃ and 0. 6 ~ 0. 7 GPa, and 476 ~ 495 ℃ and0. 09 ~ 0. 1 GPa respectively.

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