黑龙江河口林场锡多金属矿床地质特征及矿床成因

发布时间：2018-02-13 21:39

本文关键词： 斑岩型锡多金属矿床矿床成因锡霍特-阿林锡成矿省完达山河口林场　出处：《岩石矿物学杂志》2017年03期 　论文类型：期刊论文

【摘要】：黑龙江河口林场锡多金属矿床位于我国东部大陆边缘完达山陆缘增生带内,锆石ICP-MS U-Pb测年结果显示该矿床的成矿母岩体花岗斑岩形成于121.4±0.5 Ma,属早白垩世晚期,成矿时间略晚于此。地球化学测试结果显示,河口林场花岗斑岩SiO_2含量较高,为61.21%~73.81%,K_2O含量较高,为3.74%~4.61%,Na_2O为0.06%~0.20%,属高钾钙碱性系列的A型花岗岩,形成于伸展背景下。(La/Yb)N-Yb、K/Rb-Rb等微量元素比值图解显示矿体的形成与壳-幔岩浆的混合作用有关。中生代晚期(130~120 Ma)我国东部进入地壳伸展减薄的高峰期,古太平洋板块的持续西向俯冲使区内岩石圈不断增厚发生拆沉,软流圈地幔直接加热下地壳使其部分熔融导致壳幔混合作用的发生,形成的岩浆携带大量成矿物质沿伸展作用形成的空间上侵,并于运移过程中不断萃取沿途围岩中的有用组分,随后就位于三叠纪地层内,岩浆演化晚期,Sn、W等金属元素随流体不断聚集在岩浆房顶部及构造薄弱处,随着温度、压力等物化条件的改变,最终沉淀于岩体与地层的内外接触带成矿。本次研究确定了该矿床为区内发现的首例斑岩型锡多金属矿,与东侧俄罗斯境内的锡霍特-阿林锡多金属成矿省具有良好的亲缘性,为该成矿省在我国境内的延伸部分,其发现为我国东北地区锡矿的探寻工作提供了新的思路。
[Abstract]:Located in the Heilongjiang estuary forest of tin polymetallic deposits in eastern China continental margin wondersun continental margin accretionary belt, ICP-MS zircon U-Pb dating results show that the ore-forming mother rock granite porphyry deposits formed in the 121.4 + 0.5 Ma, belonging to the late Early Cretaceous, METALLOGENIC GEOCHEMISTRY. This time a little later than the test results show that the estuarine forest granite porphyry higher levels of SiO_2, 61.21%~73.81%, K_2O were higher, 3.74%~4.61%, Na_2O 0.06%~0.20%, is a A type granite high potassium calc alkaline series, formed in the extensional setting. (La/Yb) N-Yb, K/Rb-Rb and other trace element diagrams show that the mixed ratio formation between the crust and mantle magmatic ore (late Mesozoic. 130~120 Ma) in eastern China into the crust extension and thinning of the peak, continue west of the paleo Pacific plate subduction in the area of the lithosphere thickening delamination, the asthenosphere mantle crust under direct heating The result of partial melting of crust mantle mixing effect, the formation of magmatic minerals along the extension to carry large amounts of space formed by the invasion and migration process was useful in the continuous extraction along the rock, then located in the Triassic strata in the late stage of magmatic evolution, Sn, W and other metal elements with fluid accumulation in the top of the magma and tectonic weak point, with the temperature, pressure and other physical and chemical conditions change, eventually settling on the inner and outer contact zone of rock and stratum mineralization. This study determined the first porphyry tin deposit is found in the region of the polymetallic deposit, good affinity with the East Russia tin Holt Alin tin polymetallic metallogenic province, as the extension of the metallogenic province in China, found its tin in the northeast of China to explore the work provides a new way of thinking.

【作者单位】：长安大学地球科学与资源学院;吉林大学地球科学学院;四川鑫顺矿业股份有限公司;中国地质调查局沈阳地质调查中心;北京大学地球与空间科学学院;中国地质科学院矿产资源研究所国土资源部成矿作用与资源评价重点实验室;中化地质矿山总局吉林地质勘查院;
【基金】：中国地质调查项目(1212011085485,DD20160346) 中央高校基本科研业务费专项资金项目(310827161011)~~
【分类号】：P618.2

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