拉萨地块松多榴辉岩及其退变质围岩斜长角闪岩主要矿物研究及其地质意义
The Minerals Study and Geological Significance of Eclogite in Sumdo, Lhasa and Its Surrounding Rock Amphibolite
DOI: 10.12677/AG.2018.85107, PDF, 下载: 974  浏览: 2,285  国家自然科学基金支持
作者: 郭倩:广东省地质实验测试中心,广东 广州;于丽芳:广东省地质局第五地质大队,广东 肇庆
关键词: 榴辉岩斜长角闪岩磷灰石Eclogite Plagioclase Amphibolite Apatite
摘要: 西藏松多榴辉岩位于拉萨市北东方向,呈EW向带状分布,边部为斜长角闪岩。根据对榴辉岩中主要矿物成分石榴石、辉石以及多硅白云母的矿物成分分析,计算出峰期变质温度和压力。计算出来的温度和压力范围在柯世英榴辉岩相变线附近,其压力为2.55~2.72 GPa之间,温度为662℃~802℃。通过石榴石以及角闪石的协变图分析,初步推断榴辉岩经历的峰期温度压力高于利用矿物温压计计算出来的结果,由斜长角闪岩中发现的磷灰石的硫化物出溶体可知,榴辉岩在退变质为角闪岩相阶段,变质流体可能经历了氧逸度ƒo2的降低,短时的增温过程。
Abstract: Sumduo eclogite locates in the north east of Lhasa in Tibet, with the EW zonal distribution, and the edge of eclogite is plagioclase amphibolite. According to the analysis of mineral composition in garnet and clinopyroxene, phengite, which belongs to the main mineralin eclogite, we calculate the peak metamorphic temperature and pressure. The result is 662 - 802˚C, 2.55 - 2.72GPa. According to the analysis, the covariance figure of garnet and amphibole suggests that eclogite has been ex-perienced the UHP metamorphism process. Apatite found in amphibolites has sulfide dissolution, and indicates that during the retrogressive metamorphic stages of eclogites, metamorphic fluids may experience the oxygen fugacity fo2 reduced and the temperature shorten-term increase.
文章引用:郭倩, 于丽芳. 拉萨地块松多榴辉岩及其退变质围岩斜长角闪岩主要矿物研究及其地质意义[J]. 地球科学前沿, 2018, 8(5): 973-981. https://doi.org/10.12677/AG.2018.85107

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