地质学报2018，Vol.92Issue(2)：244-262,19.
黑龙江三矿沟-庄乎河地区岩浆岩年代学、地球化学研究及其俯冲构造与成矿意义
Geochronology and Geochemical Characteristics of Igneous Rocks in the Sankuanggou-Zhuanghuhe area in Heilongjiang and Its Implications for Subduction Structure and Metallogeny
摘要
Abstract
The Sankuanggou-Zhuanghuhe area is located in the north of the Duobaoshan metallogenic belt in Heilongjiang Province,NE China.Tectonic-magmatic-hydrothermal activities in the area are complicated,resulting in the formation of Sankuanggou skarn type deposits and Zhuanghuhe hydrothermal vein deposits.This study investigated geochronological,petrograpic and geochemical characteristics of magmatite rocks in the Sankuanggou and Zhuanghuhe areas.Two-period magmatic rocks have been identified:Hercynian rhyolite in Zhuanghuhe (288 Ma～294 Ma) and Hercynian Granite porphyry in Zhuanghuhe (297 Ma～303 Ma),and Yanshanian granite in Sankuanggou (172～ 179 Ma) and quartz diorite in Zhuanghuhe (165～176 Ma).Ore-forming magmatic rocks in the Sankuangou-Zhuanghuhe area are high Si and A1,alkali-rich type-Ⅰ granite,and enrichment of LILEs (such as Rb,Sr,Ba,and K),and depletion of HSFEs (such as Nb,Ta,and Ti),with distinct fractionation of HREE and LREE,and δEu loss.This study suggests that rhyolite and granite porphyry in Zhuanghuhe formed in active continental margin and was the result of subduction of the paleo Asian Ocean in the Hercynian period.The Yanshanian granite in Sankuanggou and quartz diorite in Zhuanghuhe are related to mineralization and enrichment,and the mineralization in the two areas was closely related to the subduction of the paleo Pacific in Yanshanian period.关键词
三矿沟-庄乎河/燕山期/海西期/古太平洋俯冲/年代学Key words
Sankuanggou-Zhuanghuhe/Yanshanian period/Hercynian/subduction of the paleo Pacific/Geochronology引用本文复制引用
黎心远,赵元艺..黑龙江三矿沟-庄乎河地区岩浆岩年代学、地球化学研究及其俯冲构造与成矿意义[J].地质学报,2018,92(2):244-262,19.基金项目
本文为国家973项目《兴蒙造山带构造叠合与大规模成矿作用》之课题五(编号2013CB429805)的“多宝山矿集区成矿潜力评估与战略新区预测”专题与地质调查项目《周边国家重要成矿区带对比研究及编图》之《中蒙边境大型-特大型铜-金、铀和稀有金属矿集区对比研究》子项目(编号12120115066201)联合资助的成果. （编号2013CB429805）
