摘要
对腊树下岩体从主量元素、微量元素、稀土元素和同位素等方面进行较为详细的综合研究。通过分析和对比,岩体SiO_2含量平均为72.1 8%,属酸性岩,钙碱性系列岩石。岩体属富轻稀土型花岗岩,Eu亏损较明显。根据LA-ICP-MS锆石U-Th-Pb同位素分析结果,岩体的^(206)Pb/^(238)U年龄为(171.3±1.9)Ma,属早侏罗世。岩体属过铝质岩石类型,以钾质系列为主,岩石成因类型为S型花岗岩,岩浆源岩可能来自浅部壳源沉积物质,为伸展拉张构造环境中形成的板内岩浆活动产物。研究结果可为贵东岩体的形成与演化探讨提供参考。
A comprehensive study was on Lashuxia pluton major element, trace element, rare earth element, isotope and so on. By comparing and analyzing, the rock contain 72.18% SiO2 on average and belong to acidic intrusive rocks, calc-alkaline series. The rock is rich light rare earth elements, and depleted in Eu is obviously according to U-Th-Pb isotope in zircon by LA-ICP-MS. The ^206Pb/^238U age of the rock is （171.3±1.9）Ma, belonging to Lower Jurassic Epoch. The rock is Peraluminous and fails to the potassic series mainly. The rocks genetic type of is S-type and the source may be come from the deposited material of the shallow crust. The tectonic environment is extensional tectonic environment formed in the plate magma activity product. The result provides reference for study of formation and evolution of Guidong pluton.
作者
姚巍
陈珲
马明杰
YAO Wei CHEN Hui MA Mingjie(Team No.3 of Guangdong Geologic Bureau, Shaoguan, Guangdong 512028, China)
出处
《世界核地质科学》
CAS
2016年第4期196-203,共8页
World Nuclear Geoscience
关键词
粤北
腊树下岩体
地球化学
锆石U—Pb定年
northern Guangdong province
Lashuxia pluton
geochemistry
zircon U-Pb dating
