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首页> 外文期刊>Contributions to Mineralogy and Petrology >U-Pb zircon ages, geochemical and isotopic compositions of granitoids in Songpan-Garze fold belt, eastern Tibetan Plateau: constraints on petrogenesis and tectonic evolution of the basement
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U-Pb zircon ages, geochemical and isotopic compositions of granitoids in Songpan-Garze fold belt, eastern Tibetan Plateau: constraints on petrogenesis and tectonic evolution of the basement

机译：青藏高原东部松潘-甘孜褶皱带中U-Pb锆石的年龄，花岗岩的地球化学和同位素组成：对地下成岩作用和构造演化的制约

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摘要

The Songpan-Garze fold belt, located in the eastern part of the Tibetan Plateau, covers a huge triangular area bounded by the Yangtze (South China), the North China and the Tibetan Plateau blocks. In the northeastern part of the Songpan-Garze fold belt, the Yanggon and Maoergai granitoids provide insights into regional tectono-magmatic events, basement nature and tectonic evolution. U-Pb zircon SHRIMP dating shows that the Yanggon and Maoergai granitoids have mag-matic crystallization ages of 221 + - 3.8 Ma and 216 + - 5.7 Ma, respectively. Both the granitoids display adakitic geochemicai signatures, suggesting that their magma was derived from partial melting of thickened lower crust. Pb-Sr-Nd isotopic compositions for granitoids reveal that there is an unexposed Proterozoic basement in the Songpan-Garze belt, which has an affinity with the Yangtze block. During development of the Paleo-Tethys ocean, the basement of the Songpan-Garze belt would be a peninsula approaching the Paleo-Tethys ocean from the Yangtze block.
机译：松潘-甘孜褶皱带位于青藏高原的东部，覆盖了一个巨大的三角形区域，以长江（华南），华北和青藏高原为界。在松潘—甘孜褶皱带的东北部，Yanggon和Maoergai花岗岩为区域构造-岩浆事件，基底自然和构造演化提供了见识。 U-Pb锆石SHRIMP测年表明，杨贡和毛尔盖花岗岩体的岩浆结晶年龄分别为221 +-3.8 Ma和216 +-5.7 Ma。两种花岗岩均显示出adakitic地球化学特征，这表明它们的岩浆来自加厚的下地壳的部分熔融。花岗岩类的Pb-Sr-Nd同位素组成表明，松潘-甘孜带有一个未暴露的元古代基底，与扬子地块有亲和力。在古特提斯洋的开发过程中，松潘-甘孜带的地下将是一个从扬子地块接近古特提斯洋的半岛。

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