| 陈永福.吉黑东部中生代晚期中酸性岩浆活动与金成矿作用[J].地质与勘探,2014,50(Z1):1248-1256 |
| 吉黑东部中生代晚期中酸性岩浆活动与金成矿作用 |
| Late Mesozoic intermediate-acid magmatism and gold mineralization in eastern Jiling and Heilongjiang Provinces |
| 投稿时间：2014-03-28 修订日期：2014-09-16 |
| DOI： |
| 中文关键词: 金成矿作用 中酸性岩浆活动 吉黑东部 中生代晚期 |
| 英文关键词: gold mineralization, intermediate-acid magmatism, eastern Jilin and Heilongjiang provinces, Late Mesozoic |
| 基金项目:中国人民武装警察部队黄金指挥部计划内重点项目（编号：HJY10-03）资助 |
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| 中文摘要: |
| 吉黑东部金矿床集中分布于小兴安岭北麓、完达山和太平岭（东宁-延边），矿床类型以斑岩型-浅成低温热液型矿床为主。成矿年代大约为110 Ma左右。稳定同位素显示成矿流体具有岩浆水特征，而成矿物质则主要来源于深源岩浆，这说明吉黑东部金成矿可能与岩浆活动有关。同时，研究显示吉黑东部广泛发育一套120~95 Ma的中酸性火山-侵入岩，其与110 Ma金成矿事件时空关系密切。这套火山-侵入岩在矿区表现为英安-流纹质或安山-英安质火山岩组合和闪长玢岩、花岗斑岩及花岗岩等脉岩和小侵入体。而岩石化学特征则表明其属中酸性的钙碱性系列，为一套俯冲流体交代地幔楔起源的岩浆。区域对比研究表明，吉黑东部金成矿与俄罗斯远东地区Sikhote-Alin锡成矿、韩国南部金-银成矿可能处于同一大地构造环境的不同构造部位。成矿年代从吉黑东部向东南方向有变年轻的趋势，且成矿岩浆岩的酸性成分增强而幔源成分减少。综合区域岩浆岩和区域成矿特征，表明吉黑东部存在一期110 Ma的金成矿事件，其与中生代晚期板块俯冲及其后的岩石圈拆沉作用和弧后伸展有关，成矿大地构造环境为大陆边缘弧。 |
| 英文摘要: |
| Eastern of Jilin and Heilongjiang provinces host a large number of porphyry to epithermal gold deposits with a mineralization age of ca.110 Ma, most of which are distributed in Wanda Shan, northern Xiao Hingan Ling and Taiping Ling. Stable isotope data indicate that the ore-forming fluids have features of magma water and mineralization material stems from magma at depth. It implies that the gold ore mineralization in this region is probably associated with magma activity. Furthermore, studies show that the intermediate-acid volcanic-intrusive rocks with ages of between 120~95 Ma are widely developed in this region, which is closely associated with the 110 Ma gold mineralization events in space and time. These volcanic-intrusive rocks include rhyolite-dacite and dacite-andesite, and diorite porphyry, granitic porphyry and granite which appear as dikes or/and small intrusions. And petrochemistry suggests that they belong to calc-alkaline series and derived from mantle wedges which are influenced by metasomatic subduction fluids. Regional comparison shows that gold mineralization in eastern Jilin and Heilongjiang provinces, tin mineralization of Sikhote-Alin in Russia Far East and gold-silver mineralization in South of Korea all occurred at different localities in a same tectonic setting. With the younger trend of mineralization ages from eastern Jilin and Heilongjiang provinces to the southeast, the acid content in magma increases while its mantle-source composition reduces. Combined the regional gold mineralization and magma activity, we propose that the 110 Ma gold mineralization events are associated with the late Mesozoic plate subduction and subsequent lithospheric delamination and extension of the back-arc area, which resulted in a continental margin arc. |
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