MEN Wen-hui, LIU Jian-chao, ZHANG Hai-dong, ZHANG Su-nan, WANG Jin-jin, WU Di

(1. Changan University, Xi’an 710054, China;
2. Northwest Nonferrous Geological Research Institute, Xi’an 710054, China;
3. Xi’an Geology and Mineral Resources Institute, Xi’an 710100, China)

 

Abstract: There are a lot of dark diorite enclaves that occur in the Mapeng batholith of the Shihu gold field. Studies show that: (1) Diorite dark enclaves and the Mapeng batholith have similar trace rare-earth elements characteristics. LA-ICP-MS Zircon U-Pb geochronology analysis of the dark diorite enclaves and the host rocks show both have similar ages with a small margin of error approximately 136.0±1.3 Ma. (2) Formation of dark diorite enclaves may be the result of a complex interaction between tholeiitic and granitic magma.

 

Key words: dark diorite enclaves; magma mixing; Mapeng batholith; zircon

 

 

ACTA MINERALOGICA SINICA Vol. 34, No. 4, 2014, Page 487-495