| 鲁西徂徕山地区新太古代岩浆作用——锆石SHRIMP U-Pb定年证据 |
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| 关键词:Neoarchean magmatism western Shandong Culaishan SHRIMP zircon dating |
| 基金项目:中国地质调查局地质大调查项目“华北克拉通太古宙早期陆核形成与演化”(编号: 12120114021301);“中国地质构造区划与区域地质调查综合集成”(编号: 121201081103);科技部重点项目(编号: SQ2015FY3340051) |
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| Neoarchean Magmatism in the Culaishan Area, Western Shandong: Evidence from SHRIMP Zircon U-Pb Dating |
| Culaishan is one of the most important areas with well-exposed Neoarchean rocks in western Shandong. In this paper, the authors carried out SHRIMP U-Pb zircon dating on three samples. Tonalitic gneiss has a weighted mean 207Pb/206Pb age of (2711±11) Ma for magmatic zircon with some recrystallization. It is inferred that a metamorphic event occurred at ~2.6 Ga. Zircons from a meta-quartz diorite sample show banded zoning with strong recrystallization, the age of 2.51 Ga is considered to be closer to the metamorphic time, and the intrusive time of the quartz diorite should be between 2.53 Ga and 2.55 Ga. Magmatic zircons from monzogranite show lead loss to different degrees, but the crystallization age might be ~2.5 Ga, as shown by the distribution of age data on concordia. Combined with geochemical study and previous work, the authors determined the Neoarchean geological evolution in the Culaishan area and redefined the boundary between the early Neoarchean (2.60~2.75 Ga) rock belt and the late Neoarchean (2500~2550 Ma) belt of juvenile rocks in the northwestern portion of western Shandong. |
| WAN Yu-sheng,WANG Shi-jin,REN Peng,XIE Hang-qiang,DONG Chun-yan,LIU Dun-yi.2015.Neoarchean Magmatism in the Culaishan Area, Western Shandong: Evidence from SHRIMP Zircon U-Pb Dating[J].Acta Geoscientica Sinica,36(5):634-646. |
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