| 东昆仑黑海地区早古生代过铝质花岗岩成因及对构造演化的制约 |
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| 关键词:peraluminous granite Lu-Hf isotope geochemistry zircon U-Pb chronology tectonic evolution East Kunlun orogenic belt |
| 基金项目:由第二次青藏高原综合科学考察研究(编号: 2022QZKK0201)、国家自然科学基金项目(编号: U24A20598)、青海省自然科学基金项目(编号: 2024-ZJ-984)、盐湖资源绿色高值利用重点实验室开放基金项目(编号: ISL2024-07)、中国科学院特别研究助理项目 (编号: E410DZ01)和中信十大科技创新项目盐湖资源综合开发与利用(编号: 2023ZXKYA05100)联合资助。 |
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| The Genesis of Early Paleozoic Peraluminous Granite in the Heihai Region of East Kunlun Orogenic Belt and Its Constraints on Tectonic Evolution |
| The timing of the Proto-Tethys Ocean closure in East Kunlun and the subsequent collisional orogeny remains debated. Late Silurian–Early Devonian peraluminous granites in the Heihai area of the East Kunlun orogenic belt offer critical insights, as natural objects, into this process. Our study analyzes elemental geochemistry, Hf isotope geochemistry, and zircon U-Pb chronological analyses of the Jiazutashi and Dazaohuo peraluminous granites in the Heihai area. Whole-rock geochemistry shows that both the Jiazutashi biotite granite and the Dazaohuo granodiorite are high-silica, high-alumina, alkali-rich, I-type granites, and with similar geochemical characteristics, suggesting a common magma source area. Hf isotopes indicate possible derivation of peraluminous granites from the anatexis of ancient crustal materials and mixed with mantle or juvenile crust materials. The diagenetic ages of the Jiazutashi biotite granite and the Dazaohuo granodiorite are (421.9±2.6) Ma and (412.0±2.0) Ma, respectively. The results combined with the regional geological evolution indicate that the Early Paleozoic peraluminous granites in the Heihai region probably formed in an extensional tectonic setting after the end of the collisional orogens. This indicates that the Late Silurian–Early Devonian may have completed the subduction collision between the East Kunlun and Qaidam terranes and entered the post-collision extension stage. |
| ZHAO Chuntao,CHEN Liang,LIU Ze,YU Dongmei,LING Zhiyong,HUO Shilu,HAN Jinjun,LI Peng,LI Yugang,WANG Jianping.2026.The Genesis of Early Paleozoic Peraluminous Granite in the Heihai Region of East Kunlun Orogenic Belt and Its Constraints on Tectonic Evolution[J].Acta Geoscientica Sinica,47(1):118-134. |
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