地质通报2015，Vol.34Issue(12)：2171-2180,10.
黑龙江完达山地区358高地岩金矿床花岗斑岩LA-ICP-MS锆石U-Pb定年及其地质意义
LA-ICP-MS zircon U-Pb dating of granite-porphyry from 358 Upland rock gold deposit in Wanda Mountain area, Heilongjiang Province and its geological significance
摘要
Abstract
The 358 Upland rock gold deposit is located at the east edge of the Wanda orogenic belt, being part of the Circum-Pacif-ic metallogenic belt. The authors selected the granite porphyry closely associated with mineralization in the study area to conduct a systematic study of geology, petrography, element geochemistry and LA-ICP-MS zircon U-Pb dating results. According to the re-sults obtained, the granite porphyry is rich in silicon, sodium, potassium, aluminum and poor in magnesium and calcium, the Rittman index (σ) is 1.12 to 2.00(σ<3.3), A/NK=1.36~2.00,A/CNK=1.11~1.93 (A/CNK>1.1). The granite-porphyry is enriched in LILE, relatively depleted in Ba, Nb and Ta, severely depleted in Sr, P and Ti; enriched in LREE, and depleted in HREE, with Eu anomalies. These characteristics reveal that the granite-porphyry is peraluminous, and the S type granite and magma might have been of shell source. LA-ICP-MS zircon dating methods were used to determine the age of the granite-porphyry. It is thus concluded that the gold metallogenic epoch should be late Early Cretaceous. Combined with the tectonic discrimination diagrams, the porphy-ry-granite shows the characteristics of post-collisional granite, and the formation of the porphyry might have been closely related to the post-collisional extension of the Pacific plate.关键词
完达山地区/LA-ICP-MS锆石U-Pb定年/S型花岗岩/碰撞后伸展Key words
Wanda Mountain/LA-ICP-MS zircon U-Pb dating/S type granite/post-collisional extension分类
天文与地球科学引用本文复制引用
王庆磊,杨言辰,李骞,马晓阳,谈艳,张国宾..黑龙江完达山地区358高地岩金矿床花岗斑岩LA-ICP-MS锆石U-Pb定年及其地质意义[J].地质通报,2015,34(12):2171-2180,10.基金项目
中国地质调查局项目(编号:1212011120342、12120113098300) （编号:1212011120342、12120113098300）
