泰国清孔安山岩LA-ICP-MS锆石U-Pb，Lu-Hf，氧同位素，主微量 Sr-Nd同位素
收藏国家地球系统科学数据中心2020-04-27 更新2024-03-04 收录
下载链接：
https://www.geodata.cn/data/datadetails.html?dataguid=96359635345618&docId=16511
下载链接
链接失效反馈官方服务：
资源简介：
泰国清孔安山岩的锆石U–Pb年龄为229±4Ma，明显小于大陆弧和同碰撞火山岩（约238-241Ma），且清孔火山岩低MgO，和高Al2O3。同位素数据显示其源于富集的岩石圈地幔，经板岩流体和再生沉积物改性，从而推测该区火山岩的形成可能与晚三叠世、板块拆离后不久软流圈地幔的上涌从而引起交代地幔楔的熔融有关。
The zircon U-Pb age of andesites from Qingkong, Thailand is 229 ± 4 Ma, which is significantly younger than those of continental arc and syn-collision volcanic rocks (ca. 238–241 Ma). Additionally, the Qingkong volcanic rocks have low MgO and high Al₂O₃. Isotopic data demonstrate that these rocks were derived from enriched lithospheric mantle modified by slab-derived fluids and recycled sediments. It is therefore inferred that the formation of these volcanic rocks is associated with the upwelling of asthenospheric mantle shortly after slab detachment during the Late Triassic, which triggered melting of the metasomatized mantle wedge.
提供机构：
中山大学
创建时间：
2020-04-27
