江南造山带西段桂北龙胜地区金车辉长岩矿物化学研究及其地质意义
发布时间：2019-01-11 09:56
【摘要】：桂北龙胜地区位于江南造山带西段,本文利用电子探针对桂北龙胜地区金车辉长岩单斜辉石和斜长石进行了详细的矿物学和矿物化学研究,研究表明单斜辉石的成分为Wo27~28En47~57Fs15~22,属于普通辉石,斜长石的成分为An1.35~9.05Ab90.34~97.45Or0.36~1.05,为钠长石。单斜辉石温压估算结果显示,其形成温度为1 250~1 350℃,该温度基本与软流圈地幔温度(1 280~1 350℃)相当,其形成压力为1.31~2.25 GPa,对应深度为43.2~74.3 km。单斜辉石成分特征指示金车辉长岩为板内拉斑玄武岩,结合区域地质特征,推测金车辉长岩是裂谷构造背景下软流圈地幔物质上涌并发生减压熔融的产物。
[Abstract]:The Longsheng area of northern Guangxi is located in the western section of the Jiangnan orogenic belt. Detailed mineralogical and mineralogical studies of clinopyroxene and plagioclase in the Longsheng area of northern Guangxi are carried out by using electron probe. The results show that the composition of clinopyroxene is Wo27~28En47~57Fs15~22,. It belongs to ordinary pyroxene and the composition of plagioclase is An1.35~9.05Ab90.34~97.45Or0.36~1.05, and albite. The temperature and pressure estimation of clinopyroxene shows that the formation temperature is 1 250 ~ 1 350 鈩，
本文编号：2406998
[Abstract]:The Longsheng area of northern Guangxi is located in the western section of the Jiangnan orogenic belt. Detailed mineralogical and mineralogical studies of clinopyroxene and plagioclase in the Longsheng area of northern Guangxi are carried out by using electron probe. The results show that the composition of clinopyroxene is Wo27~28En47~57Fs15~22,. It belongs to ordinary pyroxene and the composition of plagioclase is An1.35~9.05Ab90.34~97.45Or0.36~1.05, and albite. The temperature and pressure estimation of clinopyroxene shows that the formation temperature is 1 250 ~ 1 350 鈩，
本文编号：2406998
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