地质通报Issue(7)：974-983,10.
内蒙古毛登地区碎斑熔岩LA-ICP-MS锆石U-Pb年龄与地球化学特征
LA-ICP-MS zircon U-Pb dating and geo-chemical characteristics of the porphyroclastic lava in Maodeng area of Inner Mongolia
摘要
Abstract
The porphyroclastic lava with the texture of both lava and ignimbrite was found for the first time in Maodeng area of In-ner Mongolia. The Maodeng porphyroclastic lava body,occurring as an oval dome,can be divided into internal facies,transitional facies and external facies. Based on the field geological investigation and the LA-ICP-MS zircon U-Pb age ,the authors hold that it was produced by volcanic and magmatic activities in Early Cretaceous. The rock is characterized by enriched Si ,alkaline and LREE, with relatively strong negative Eu anomaly ,high Rb and Th content and low Ba and K. It resembles the liparite of the same period in geochemical characteristics. It is suggested that the porphyroclastic lava body was formed in an intra-plate anorogenic extensional setting.关键词
碎斑熔岩/早白垩世/LA-ICP-MS锆石U-Pb定年/岩石地球化学/毛登地区Key words
porphyroclastic lava/Early Cretaceous/LA-ICP-MS zircon U-Pb dating/petrochemistry/Maodeng area分类
天文与地球科学引用本文复制引用
张学斌,周长红,贾晓青,吴荣泽,徐翠,杨菊,王明明,范超..内蒙古毛登地区碎斑熔岩LA-ICP-MS锆石U-Pb年龄与地球化学特征[J].地质通报,2014,(7):974-983,10.基金项目
中国地质调查局项目 （）
