东昆仑造山带低山头花岗岩体岩石地球化学特征及其地质意义

doi:10.13278/j.cnki.jjuese.20200183

Abstract

Abstract: The granite body in Dishantou area belongs to the North Kunlun magmatic arc belt of the East Kunlun arc basin. It is located in the middle part of the East Kunlun orogenic belt in the Berkarik Xiangride metallogenic sub belt of the East Kunlun metallogenic belt. The main rock types are quartz diorite, syenogranite and monzogranite. To strengthen the study on the petro-geochemistry and diagenesis and metallogenic background of the granitic bodies in this area, the analysis on the major elements, trace elements, and mineral elements of the granitic bodies has been carried out. The quartz diorite has the characteristics of medium silicon (57.64% and 58.47%) and rich sodium (Na₂O/K₂O is 2.57) in the composition of the main elements. The syenogranite is characterized by high silicon (75.45%-75.99%) and rich potassium (Na₂O/K₂O is 0.74-0.94). The monzogranite is characterized by high silicon (66.80%-73.45%) and rich sodium (Na₂O/K₂O is 1.50-2.13). A/CNK of the granitic body is less than 1, indicating that it is aluminous magmatic rock. The alkali saturation index (NK/A) ranges from 0.26 to 0.69, belonging to calc-alkaline type. The light rare earth elements are relatively enriched in heavy rare earth elements (characteristics of magmatic differentiation), large ion lithophile elements (LILE) of Rb, K, Ba, Th, Sr and Nd, only syenogranite is depleted in Sr; Meanwhile, high field strength elements (HFSE) are rich in Zr, Hf and Ce, but Nb, P, and Ti are depleted apparently, indicating the source materials of crust-mantle mixing, formed under an extrusion stress environment with collision type I granite. In 11 kinds of elements analysis of data obtained from the rock mass, compared with the average element abundances of Qinghai Province, the East Kunlun metallogenic belt and its sub metallogenic belt, the granite types with different lithology and different ages are preliminarily divided, and the enriched ore-bearing elements are Au, Zn, Y, Pb, etc. Compared with the regional metallogenic facts and the genesis of I-type granites, the study area has a good prospecting potential.

Key words: petrogenesis, granite body, geochemistry, mineral elements, East Kunlun orogenic belt, Dishantou area

CLC Number:

P581

Deng Hongbin, Li Peilong, Wei Huacai, He Wenjin, Yang Pengtao, Li Ning, Tang Hua. Petro-Geochemical Characteristics and Geological Significance of Dishantou Granite Body in East Kunlun Orogenic Belt[J].Journal of Jilin University(Earth Science Edition), 2021, 51(3): 767-782.

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Petro-Geochemical Characteristics and Geological Significance of Dishantou Granite Body in East Kunlun Orogenic Belt

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