Zircon U-Pb Geochronology and Sr-Nd-Hf Isotopic Geochemistry of Quartz Syenite from Wanghaigang Pluton in Huangyan County , Zhejiang
详细信息
- 责任者：Qiu Jiansheng (State Key Laboratory for Mineral Deposits Research ; Nanjing University ; Nanjing 210093 ; China) ; Liu Liang
- 刊名：Acta Petrologica Sinica
- 出版年：2011
- 卷期：27(6)
- 关键词：石英正长岩 ; quartz syenite ; 铀—铅计时 ; U-Pb dating ; 元素地球化学 ; elements geochemistry ; 浙江 ; Zhejiang Province
- 页码：p.1557-1572
- 图表：10 illus., 6 tables, 69 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
The Wanghaigang pluton,lithologically consisting mainly of quartz syenite, is a typical Late Mesozoic central stock intruded in a caldera in the coastal area of Zhejiang Province. Zircon LA-ICP-MS U-Pb dating for two representative samples yields ages of (98.3±1.2) Ma and (98.5±1.3) Ma, respectively, indicating that they were generated during the initial stage of Late Cretaceous. Using the zircon saturation geothermometer proposed by Watson and Harrison (1983), and the Al-in-hornblende geobarometer of Johnson and Rutherford (1989), the rock-forming temperature and pressure have been estimated. The results have shown that the pluton was crystallized in a high temperature (826~846 ℃) and hypabyssal (emplacement depth of about 2~3 km) environment. The integrated petrology,elemental and isotopic compositions suggest that the pluton was most likely generated under a back-arc extensional setting, and via a process including formation of parental magma by mixing of a underplated mantle-derived magma and an induced crustal-melted magma in the deep crust, then suffered differentiation during magma ascent and at last emplaced at a hypabyssal environment.