Geochemistry and zircon U-Pb chronology of quartz porphyry in Yuejinshan Fe-polymetallic deposit of Heilongjiang

作者：JIN Ye,CUI Bo,WANG Li,YANG Baihui,YIN Yue,LI Qing,WANG Shuo,CHEN Xiaohang,LIU Xiang

摘要：Quartz porphyry in Yuejinshan Fe-polymetallic deposit is one of the rock masses, which formed the granite belt relating to the late Yanshanian skarn-type Fe-polymetallic deposits in the eastern Heilongjiang, and is also closely related to the metallogenic space of the Fe-polymetallic deposits. Quartz porphyry has the zircon U-Pb concordia age of 125.0±1.1 Ma, overall showing high Si (SiO 2=74.48%-- 75.00%), rich alkaline (Na2O+K 2O=7.93%-8.17%, K 2O/Na 2O=1.39-- 1.46), and poor Mg (MgO=0.27%-- 0.31%), with the A/CNK value being 0.95--0.99, having the characteristics of obvious enrichment of LREE and medium Eu negative anomaly (0.69-- 0.74), indicating that the rock belongs to quasi-aluminous high potassium calc-alkaline series and has the same characteristics as those of the I-type granite. The rock is also characterized by the enrichment of LILE and active incompatible elements, and depletion of HFSE such as Nb, Ta, P and Ti, with the Mg # value being 32--- 37, indicating that the rock originated from partial melting of crustal materials. It can be concluded from the above characteristics or data and from the distribution of contemporary magmatic rocks in the area, that quartz porphyry in Yuejinshan Fe-polymetallic deposit was formed in a tectonic background of the subduction of the paleo-Pacific plate in late Yanshanian.

发文机构：College of Earth Sciences College of Earth Sciences School of Earth Science and Researces Geological Survey of Hebei Province

关键词：quartzPORPHYRYZIRCONU-PBageGEOCHEMISTRYYuejinshanFe-polymetallicdeposit

分类号： P[天文地球]