矿床地质2018，Vol.37Issue(1)：137-150,14.DOI:10.16111/j.0258-7106.2018.01.010
黑龙江省塔河县宝兴沟金矿床中生代侵入岩及其对成矿作用的制约
Mesozoic intrusive rocks and their constraints on mineralization in Baoxinggou gold deposit in Tahe County, Heilongjiang Province
摘要
Abstract
The Baoxinggou gold deposit is a large-sized gold deposit discovered in south Mohe foreland basin in recent years Gold mineralization has close relationship with quartz diorite and dioritic porphyrite in this area.Orebodies mainly occur within the intrusion and its contact zone with the sandstone.A study of the geochemistry of this deposit shows that major elements in quartz diorite are characterized by high potassium,low titanium,and high alkali.Major elements in aplite granite are characterized by high SiO2,high potassium,low titanium,and high alkali.They both belong to the high-K calc-alkaline series.They have such geochemical features as relatively enrichment of large ion lithophile elements like Rb,Ba and Sr,depletion of high field strength elements like Nb,Ta,Ti and HREE Yb and Y.However,the characteristics and distribution curve of REE of the quartz diorite and the aplite granite show obvious differences,suggesting that they have no genetic relationship.As for trace element ratio on the cobweb map and the REE map,the trace elements and the REE distribution curves are close to curves of quartz diorite and dioritic porphyrite.They provided hydrothermal solution,mineralization material for ore-forming process,suggesting intimate relationship with mineralization.Zircon LA ICP MS U-Pb isotope dating shows that the rock-forming time of the quartz diorite is 118.13～121.77 Ma,indicating Early Cretaceous.This deposit was formed in an extension environment resulting from subduction of the Pacific plate to the Eurasian plate.Therefore,the mineralization of the Baoxinggou gold deposit was not earlier than 118 Ma.Besides the intrusive rocks of the middle-Late Jurassic,the medium acidic intrusion in Early Cretaceous also played an important role in regional mineralization,and hence it is one of the important prospecting directions in the future.关键词
地球化学/锆石U-Pb测年/成矿作用/中生代侵入岩/宝兴沟金矿床Key words
geochemistry/zircon U-Pb dating/gold mineralization/Mesozoic intrusive rocks/Baoxinggou gold deposit分类
天文与地球科学引用本文复制引用
周传芳,王献忠,李向文,杨华本,宋贵斌,段明新,郭宏宇..黑龙江省塔河县宝兴沟金矿床中生代侵入岩及其对成矿作用的制约[J].矿床地质,2018,37(1):137-150,14.基金项目
本文得到中国地质调查局重要矿产资源调查计划(编号:[2015]02-14-03-002)资助 （编号:[2015]02-14-03-002）
