海南岛晚中生代壳幔岩浆混合作用——来自闪长质淬冷包体的证据  

Mixing of Late Mesozoic crust-mantle-derived magma in Hainan island:Evidence from quenched dioritic enclaves

作　　者：云平[1] 范渊[1] 莫位任[1] 周进波[1] 

机构地区：[1]海南省地质调查院,海南海口570206

出　　处：《华南地质与矿产》2003年第2期30-35,共6页Geology and Mineral Resources of South China

基　　金：中国地调局区域地质调查项目 (2 0 0 1130 0 0 0 4 1)

摘　　要：对海南岛屯昌花岗闪长岩中的闪长质淬冷包体进行了较详细的研究。岩石和岩石地球化学特征均显示包体是由来自地幔的高温镁铁质岩浆注入地壳长英质岩浆混合而成 ,是深部壳幔岩浆混合作用的岩石学记录。它表明海南岛自中晚侏罗世以来发生的岩石圈伸展 -减薄 -双峰式构造岩浆作用于白垩纪达到了鼎盛阶段。Petrological and petrochemical study shows that the quenched dioritic enclaves within granodiorite from Tunchang, Hainan island are product of mixing of crust-derived felsic magma with the mantle-derived high-temperature femic magma, and are petrological record of deep crust-mantle magma mixing. They indicate that lithospheric extension and thinning as well as bimodal magmatism began at Midle-Late Jurassic and reached peak in Cretaceous.

关 键 词：海南岛 晚中生代 岩浆混合作用 地球化学特征 闪长质淬冷包体 岩石学特征 

分 类 号：P588.11[天文地球—岩石学] P596.2[天文地球—地质学]