西藏江玛地区闪长玢岩锆石U-Pb年龄、地球化学特征及其地质意义

尹滔; 张伟; 尹显科; 裴亚伦

doi:10.3799/dqkx.2020.136

Volume 45 Issue 11

Nov. 2020

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Article Navigation > Earth Science > 2020 > 45(11): 4128-4142

Yin Tao, Zhang Wei, Yin Xianke, Pei Yalun, 2020. Zircon U-Pb Ages, Geochemistry and Geological Significance of Diorite Porphyrite in Jiangma Area, Tibet. Earth Science, 45(11): 4128-4142. doi: 10.3799/dqkx.2020.136

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Yin Tao, Zhang Wei, Yin Xianke, Pei Yalun, 2020. Zircon U-Pb Ages, Geochemistry and Geological Significance of Diorite Porphyrite in Jiangma Area, Tibet. Earth Science, 45(11): 4128-4142. doi: 10.3799/dqkx.2020.136

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Zircon U-Pb Ages, Geochemistry and Geological Significance of Diorite Porphyrite in Jiangma Area, Tibet

doi: 10.3799/dqkx.2020.136

Evaluation and Utilization of Strategic Rare Metals and Rare Earth Resources Key Laboratory of Sichuan Geological Survey, Chengdu 610081, China

Received Date: 2020-02-20
Publish Date: 2020-11-15

Abstract

Abstract

There are relatively few reports on the intermediate-acid intrusive rocks in the Bangonghu-Nujiang ophiolitic melange belt, the study on the petrogenesis and tectonic setting of this rocks is important to define the geodynamic evolution of Bangonghu-Nujiang Tethys oceanic. It reports zircon U-Pb age and major-trace elements for the diorite porphyrite from the Jiangma area in the Bangonghu-Nujiang suture zone. Zircon LA-ICP-MS U-Pb dating of the diorite porphyrite yields an Early Cretaceous age of a 121±1 Ma, indicating that the intruded rocks were formed in the late Early Cretaceous period. Geochemical studies show that diorite porphyrite has typical geochemical characteristics similar to the high-alumina basalts. They are characterized by high Al₂O₃ contents (18.2%-19.3%), and enriched in light rare earth elements and large ion lithophile elements (Rb and K), but depleted in high field strength elements (Nb, Ta and Ti). All of these geochemistry characteristics of the rocks are the same as the typically island arc basalts. Combined with the regional geological setting, the diorite porphyrite may be formed in an accretive arc environment related to the southward subduction of Bangonghu-Nujiang Tethys oceanic crust in late Early Cretaceous. The fluids derived from the subducted oceanic crust would metasomatize the overlying mantle peridotite to generate the mantle source of the studied diorite porphyrite.
- Bangonghu-Nujiang ophiolitic melange belt,
- diorite porphyrite,
- high-alumina basalts,
- subduction,
- zircon U-Pb chronology,
- geochemistry

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References(87)

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Zircon U-Pb Ages, Geochemistry and Geological Significance of Diorite Porphyrite in Jiangma Area, Tibet

doi: 10.3799/dqkx.2020.136

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