地质与勘探2011，Vol.47Issue(5)：772-781,10.
黑龙江省东宁金厂金矿区火山岩地质地球化学特征
Geological and Geochemical Characteristics of Volcanic Rocks from the Jinchang Gold Deposit in Dongning,Heilongjiang Province
摘要
Abstract
The volcanic rocks in the Jinchang gold deposit,about 6 km southeast of the Tonggouling volcanic edifice,is a suite of dacitic and rhyollitic volcanoclastic,tuff and ignimbrite rocks with the pyroclastic flow facies and side volcanic neck facies,belonging to the Luoquanzhan Formation.In the study area,the volcanic rocks are calc-alkaline series rocks,with SiO2 content 66.32%～75.56 %,K2O＋Na2O 6.05%～8.30%,and Rotman index（σ） 0.52～2.48.Trace element analysis suggests their strong enrichment in Pb,depleted in Sr,Nb,Ta,P and Ti,consistent with continental crust characteristics.REE analysis shows they are rich in light rare earth elements and have a weak negative Eu anomaly.Rock geochemistry indicates that the volcanic magma originated from the lower crust when subduction of the Paleo-Pacific plate changed the tectonic regime from compression to extension and induced the delamination of the thickened lower crust and lithospheric mantle and consequent upwelling of the asthenosphere which triggered the volcanic eruption in 130～110Ma.Volcanic activity is a prelude of the Jinchang gold deposit metallogenesis of the porphyry type in 120～110Ma.The Tonggouling volcanic edifice supplied the ore-forming structure while the volcanic rocks are the source of partial Au.It is important to explore the porphyry ore-controlling systems that are controlled by the coeval volcanic structure in this region.关键词
金厂金矿/火山岩/地质特征/地球化学特征/金成矿作用/黑龙江Key words
Jinchang gold deposit/volcanic rocks/geological characteristics/geochemical characteristics/gold mineralization分类
天文与地球科学引用本文复制引用
陈永福,赵玉锁,肖力,阎家盼,孔媛媛,卿敏,刘纲..黑龙江省东宁金厂金矿区火山岩地质地球化学特征[J].地质与勘探,2011,47(5):772-781,10.基金项目
武警黄金指挥部计划内重点项目《延边-东宁成矿带“金厂式”金矿综合研究及勘查突破（HJY10-03）资助 （）
