【作者】 吴澄宇； 黄典豪； 丁孝石； 白鸽；

【Author】 Wu Chengyu,Huang Dianhao,Ding Xiaoshi and Bai Ge (Institute of Mineral Deposits,Chinese Aca.lemy of Geological Sciences)

【机构】 矿床地质研究所；

【摘要】 位于武夷山后加里东隆起区南部的南桥岩体由片麻状混合岩(130.6 Ma)和"白色"石英正长岩、"红色"石英正长岩(95.7 Ma)所组成。详细的野外观察和岩石学、矿物学研究,以及痕量元素分析揭示了它们之间的继承演化关系,它们是与燕山期构造-岩浆热事件有关的交代-深熔作用叠加在古老变质岩—混合岩之上的产物,为非造山的混合岩化作用提供了很好的实例。较高的放射性成因铅同位素组成和中等的锶初始比值(0.70852—0.70899)预示参预这一过程的富钾高温流体主要是从地壳中派生的。更多还原

【Abstract】 The Nanqiao rock body is located in the southern part of the Wuyishan （Wuyi Mountain） post-Caledonian uplift which is an area famous for extensive distribution of Caledonian migmatite and migmatitic granite.Nevertheless, our field observations,petrological and mineralogical studies and trace element analyses all indicate that the Nanqiao gneissic migmatite（dated at 130.6 Ma by zircon U-Pb method） and the"white"and"red"quartz syenite（dated at 95.7 Ma by zircon U-Pb method） are products of metasomatism-anatexis related to Yanshanian tectonomagmatic activity,thus serving as an example of anorogenic migmatization.The relatively high radiogenic lead isotope contents of K-feldspar and whole rock samples and the moderate ⁸⁷Sr/⁸⁶Sr ratios （0.70852—0.70899） of apatite suggest that the high-temperature K-rich migmatitic fluids were mainly derived from the crust.更多还原