泰国清孔安山岩锆石U-Pb年龄，Lu-Hf同位素，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2020-05-20 更新2024-03-04 收录
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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 that of continental arc and syn-collisional volcanic rocks (ca. 238–241 Ma). Moreover, the Qingkong volcanic rocks exhibit low MgO contents and high Al2O3 concentrations. Isotopic data indicate that these rocks were derived from enriched lithospheric mantle modified by slab fluids and recycled sediments. Thus, it is inferred that the formation of volcanic rocks in this region is likely related to the upwelling of asthenospheric mantle shortly after slab detachment during the Late Triassic, which triggered the melting of the metasomatized mantle wedge.
提供机构：
中山大学
创建时间：
2020-05-20
