| 青海治多地仁地区过铝质花岗岩地球化学特征及构造意义 |
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| 关键词:Bayankara Group granite zircon U-Pb age tectonic setting |
| 基金项目:青海省科技计划项目(编号: 2016-ZJ-716; 2016-SF-A3; 2016-ZJ-719) |
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| Geochemical Characteristics and Tectonic Significance of High Aluminium Granites in Diren Area of Zhiduo County, Qinghai Province |
| Granites are distributed in the southern part of the Songpan–Ganzi block in Diren area of Zhiduo County, Qinghai Province. The granites in the study area can be divided into three units: Diren diorite (T3δo), Riqin granodiorite (T3γδ), and Jiaokao porphyry potash feldspar plagioclase granite (T3πηγ), The rock masses exhibit small batholiths and stocks. The granite belongs to aluminum type and has both I and S-type granite characteristics. Eu negative anomalies are obvious, with significant light and heavy rare earth fractionation. Ta, Nb, Ce, Sm, Hf are slightly enriched, Y and Yb are strongly depleted, Rb/Ba ratio is 0.38, and Nb/Ta ratio is 16.44. These data show that the granite has a crustal source rock, partly with the characteristics of molten granite. Single-grain zircon U-Pb ages range from 210 to 225 Ma in the study area. It is thus held that the granite has the characteristics of collision late stage orogenic granite of the Bayankara tectonic belt. |
| ZHAO Cheng-xiang,LI Shan-ping,PAN Tong,LIN Hao,JIN Ting-ting.2018.Geochemical Characteristics and Tectonic Significance of High Aluminium Granites in Diren Area of Zhiduo County, Qinghai Province[J].Acta Geoscientica Sinica,39(1):45-52. |
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