Subduction and Collision of the Jinsha River Paleo‐Tethys: Constraints from Zircon U‐Pb Dating and Geochemistry of the Ludian Batholith in the Jiangda–Deqen–Weixi Continental Margin Arc,Acta Geologica Sinica-English Edition

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Subduction and Collision of the Jinsha River Paleo‐Tethys: Constraints from Zircon U‐Pb Dating and Geochemistry of the Ludian Batholith in the Jiangda–Deqen–Weixi Continental Margin Arc
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2020-08-30 , DOI: 10.1111/1755-6724.14554
Juan HE ₁ , Baodi WANG ₁ , Qiyu WANG _{1,

2}

Affiliation

The Jiangda–Deqen–Weixi continental margin arc (DWCA) developed along the base of the Changdu–Simao Block and was formed as a result of the subduction of the Jinsha River Ocean Slab and the subsequent collision. The Ludian batholith is located in the southern part of the DWCA and is the largest batholith in northwest Yunnan. Granite samples from the Ludian batholith yield an early Middle Permian age of 271.0 ± 2.8 Ma. The geochemical data of the early Middle Permian granitoids show high Si₂O, low P₂O₅ and MgO contents that belong to calc‐alkaline series and peraluminous I‐type rocks. Their ∊Hf(t) values range from –5.01 to +0.58, indicating that they were formed by hybrid magmas related to the subduction of the Jinsha River Tethys Ocean. The monzonite and monzogranite samples yield Late Permian ages of 250.6 ± 1.8 Ma and 252.1 ± 1.3 Ma, respectively. The Late Permian granitoids are high‐K calc alkaline and shoshonite series metaluminous I‐type rocks. Their ∊Hf(t) values range from –4.12 to –1.68 and from –7.88 to –6.64, respectively. The mixing of crustal and mantle melts formed the parental magma of the Late Permian granitoids. This study, combined with previous work, demonstrates the process from subduction to collision of the Jinsha River Paleo‐Tethys Ocean.

中文翻译：

金沙江古特提斯的俯冲与碰撞：江大-德钦-渭西大陆边缘弧中锆石U-Pb测年和鲁甸岩基的地球化学约束

江达-德钦-渭西大陆边缘弧（DWCA）沿昌都-思茅区块的基础发展，是金沙江大洋板俯冲及随后的碰撞形成的。dian甸岩基岩位于DWCA的南部，是滇西北最大的岩基岩。鹿店岩基的花岗岩样品产生的早二叠世年龄为271.0±2.8 Ma。早期中二叠世花岗岩的地球化学数据显示高Si ₂ O，低磷₂ ö ₅和属于钙碱性系列和过铝质I型岩石的MgO含量。他们的∊ Hf（t）值介于-5.01至+0.58之间，表明它们是由与金沙江特提斯洋俯冲有关的混合岩浆形成的。蒙脱石和蒙脱石样品的二叠纪晚期年龄分别为250.6±1.8 Ma和252.1±1.3 Ma。晚二叠纪的花岗岩类是高钾钙碱性和shoshonite系列的金属I型岩石。它们的∊ Hf（t）值分别在-4.12至-1.68和-7.88至–6.64之间。地壳和地幔熔体的混合形成了二叠纪晚花岗岩的母岩浆。这项研究与先前的工作相结合，说明了金沙江古特提斯海洋从俯冲到碰撞的过程。

更新日期：2020-08-30

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