地质论评2012，Vol.58Issue(5)：965-977,13.
粤东地区早白垩世花岗质岩浆作用及其成因演化
The Magmatic and Genetic Evolution of Early Cretaceous Granitoids in Eastern Guangdong Province
摘要
Abstract
Granitoids in the Eastern Guangdong encompass three main rock types; the Dapu biotite-granites, the Dapu bitite-K-spar granites and the Jiexi bitite-K-spar granites. Zircon LA-ICP-MS U-Pb dating of the Dapu biotite-granites and the Jiexi bitite-K-spar granites indicates similar ages of emplacement of 136. 3 ?0. 6Ma and 134.9 ?.4Ma Respectively, which belongs to Early Cretaceous but not Late Jurassic; All of these three types of rocks are rich in Si, Al, medium in alkali content, but poor in Fe, Mg, Ca, Ti and P, belong to a high-K calc-alkaline series, as well as a weakly peraluminous granite series. The Dapu biotite-granites has8Eu mid-negative anomaly, slightly right-inclined REE distribution pattern, forming by the partial-melting of Proterozoic arenitic metasediments. The Dapu bitite-K-spar granites and the Jiexi bitite-K-spar granites have strongly 8Eu negative anomaly, seagull-like REE pattern. The Dapu bitite-K-spar granites and the Jiexi bitite-K-spar granites are coexist closely, forming in the same time, and shows continuous variation trend in geochemistry, have similar isotopic composition, may be formed by partial melting of Proterozoic pelitic metamorphic sedimentary rocks, are the results of different evolution stage of the same magma.关键词
同位素地质年代学/地球化学/成因演化/粤东地区Key words
isotope chronology/ geochemistry/ genesis evolution/ eastern Guangdong province引用本文复制引用
赵希林,余明刚,刘凯,毛建仁,叶海敏,邢光福..粤东地区早白垩世花岗质岩浆作用及其成因演化[J].地质论评,2012,58(5):965-977,13.基金项目
本文为中国地质调查局基础地质调查项目(编号1212011085446和1212011120134)的成果. （编号1212011085446和1212011120134）
