| 鲁浩,江国会,林大伟,郑琳琳,李金涛,朱金华,张海芳,刘欢.东昆仑西段再力克山三叠纪花岗岩成因:来自 U-Pb年代学及岩石地球化学的约束[J].矿产勘查,2025,16(11):2397-2411 |
| 东昆仑西段再力克山三叠纪花岗岩成因:来自 U-Pb年代学及岩石地球化学的约束 |
| Genesis of the Triassic granites in the western Zeleke Mountains of the East Kunlun: Constraints from U-Pb chronology and petrogeochemistry |
| 投稿时间：2024-06-11 |
| DOI：10.20008/j.kckc.202511001 |
| 中文关键词: 锆石 U-Pb年代学 岩石地球化学 三叠纪 再力克山 东昆仑 |
| 英文关键词: zircon U-Pb geochronology petrogeochemistry Triassic Zeleke Mountains east Kunlun |
| 基金项目:本文受新疆地勘基金中心“新疆若羌县大沙沟一带1∶5万(J45E019019、J45E020018、J45E020019、J45E021018、J45E021019)区域地质矿产调查项目(XB-DK-2015-1-05)资助。 |
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| 中文摘要: |
| 再力克山花岗岩位于新疆东昆仑造山带西段，岩性主要为花岗闪长岩和二长花岗岩，为进一步探讨东昆仑造山带三叠纪构造-岩浆演化史，本文对研究区内再力克山花岗岩进行了详细的岩石学、地球化学及锆石 U-Pb年代学研究。研究结果表明，再力克山花岗岩锆石 U-Pb年龄为(210.3±1.4)Ma和(211.3±1.1) Ma，为晚三叠世岩浆活动产物。花岗岩 SiO2含量为 65.94%～72.10%、Na2O为 2.68%~4.33%、K2O为 |
| 英文摘要: |
| The Zeleke Mountains granite is situated in the western segment of the East Kunlun orogen in Xinji.ang and is primarily composed of granodiorite and monzogranite. To enrich the Triassic tectonic-magmatic evolu.tion history of the East Kunlun orogen, comprehensive petrographic, geochemical, and zircon U-Pb geochronologi.cal studies were conducted on the Zeleke Mountains granite within the study area. The study reveals that the zirconU-Pb ages of the Zeleke Mountains granite are (210.3±1.4) Ma and (211.3±1.1) Ma, indicating that it is a product ofLate Triassic magmatic activity. Geochemical studies indicate that the granite in the region has SiO2 contents rang. ing from 65.94% to 72.10%, Na2O from 2.68% to 4.33%, K2O from 2.22% to 5.27%, and the aluminum saturationindexes (A/CNK) of 1.08 to 1.41. These findings suggest that the granite is peraluminous calc-alkaline series, char.acterized by high total rare earth element contents, exhibiting a right-dipping distribution pattern with light rareearth enrichment and heavy rare earth depletion, and displaying weak negative Eu anomalies (δEu=0.29-0.71). Therocks are also enriched in large ion lithophilic elements of Rband K, and depleted in high field strength elements,such as Nb, Ta and Zr, indicating their crustal-derived granite characteristics. In light of the regional tectonic evolu.tion characteristics, the Zeleke Mountains Triassic granite in the study area experienced partial melting of crustalmaterials, and formed, in a post-collision tectonic setting. |
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