黑龙江省逊克县翠宏山地区矿床成因及成矿系列
发布时间：2018-09-09 16:29
【摘要】：矿床成矿系列研究是研究区域成矿规律的一种重要思想，探索同一地质时期、同一地质时代下形成的不同类型之间的矿床成因联系，与指导找矿及矿产资源开发利用有最直接的关系。翠宏山矿集区位于伊春-延寿成矿带东段，是成矿带重要的组成部分，处于小兴安岭-松嫩地块和佳木斯-兴凯地块的拼合活动带上。区域上受到古亚洲洋构造体系和环太平洋构造体系的双重影响，又受到加里东期至燕山期的多期岩浆侵入，区内形成了大批与岩浆活动作用有关的内生矿床。 本文通过对翠宏山矿集区内矿床的成矿地质条件、矿化特征及矿石类型进行了野外的系统调研，探索他们之间的成因联系，并对矿集区内3个典型矿床进行了解剖性研究。岩相学特征显示，与翠宏山矽卡岩型矿床密切相关的岩体为中粗粒二长花岗岩，局部相变为黑云母二长花岗岩，花岗闪长岩与成矿关系不大；与霍吉河斑岩型钼矿呈成矿有关的岩体主要为花岗闪长岩；与库滨热液型矿床有关的岩体主要为二长花岗岩。地球化学特征显示，样品SiO2含量均66%, Na2O+K2O含量介于7.84%~9.39%之间，K2O/Na2O介于1.10~1.72之间，Al2O3含量在12.45%~14.90%之间，样品均属于准铝质高钾钙碱性系列。微量元素地球化学特征显示，翠宏山矿集区内样品均具有富集Rb、K等大离子亲石元素，亏损Nb、Ta、Ti、P等亏损高场强元素的特点，稀土元素配分曲线特征显示出轻稀土相对富集、重稀土相对亏损的特点，岩体具有I型和A型花岗岩的特征。 LA-ICP-MS锆石U-Pb同位素结果显示，花岗闪长岩、二长花岗岩和黑云母二长花岗岩的206Pb/238U年龄加权平均值为分别为484±4.7Ma、198.9±1.6Ma和199.0±3.2Ma。结合霍吉河花岗闪长岩和二长花岗岩的岩体成矿年龄（184Ma~186Ma），认为翠宏山矿集区的成矿作用主要发生在燕山早期。 翠宏山赋矿岩体锶同位素结果表明，加里东期花岗闪长岩的87Sr/86Sr比值为0.767605，标明该期岩浆可能形成于壳源物质的熔融；燕山期花岗岩87Sr/86Sr比值分别为0.717454和0.723593，平均值为0.720523，具有混染岩浆所具有的同位素特征。结合翠宏山矿床黄铁矿、方铅矿等金属矿物硫同位素测试δ34S介于1.2‰~5.78‰之间，接近幔源硫（-3‰δ34S3‰），暗示了燕山期这赋矿的壳源岩浆可能形成于幔源玄武质岩浆的底侵作用诱发的下地壳部分熔融，并且与幔源玄武质岩浆发生了壳幔混染作用，幔源的硫及其它成矿元素进入到壳源岩浆系统参与成矿 翠宏山矿床和霍吉河矿床流体包裹体测温结果显示，翠宏山矿床包裹体均一温度在174.7℃~372.3℃之间，主体均一温度在240℃~280℃之间，盐度集中在（5.85~11.6）%NaCl eqv之间；霍吉河矿床包裹体均一温度介于141℃~353℃之间，峰值在200℃~280℃之间，盐度处于（1.22~9.73）%NaCl eqv范围内。成矿流体均具有中温-低盐度的H2O-NaCl的特点，盐度变化范围较大，暗示成矿流体主要来自于岩浆水，在成矿过程中混入有部分大气水。 通过对矿集区内典型矿床的解剖性研究。矿床的产出具有一定的专属性，矽卡岩型-热液型Fe、Mo、Pb、Zn矿床主要分布在燕山期中酸性侵入体和碳酸盐岩地层的接触带上。斑岩型矿床Cu、Mo矿床主要形成于燕山期岩体与后期热液发生硅化、钾长石化等热液蚀变带上。翠宏山矿集区内构造活动频繁，NNE向或近SN向与NW向的两组断裂交错控制着区内地层及岩浆岩的分布，更为岩浆后期热液的侵入和运移提供了通道，进而控制了金属矿物的储存和矿床产出的形态和规模，因此在两组断裂的交汇部位是翠宏山矿集区内矿床成矿的有利部位。笔者将翠宏山矿集区划分成1个矿床成矿系列，包含2个成矿亚系列，，并初步建立了矿床成因模型图，为区域找矿提供了有利依据，也为矿区内新矿床发现及已有矿床的深部找矿工作指明了方向。
[Abstract]:The study of metallogenic series of ore deposits is an important idea to study the regional metallogenic regularity. It is a metallogenic belt located in the eastern section of Yichun-Yanshou metallogenic belt. The important component is located in the convergence zone of the Xiao Hinggan-Songnen and Jiamusi-Xingkai blocks. The area is influenced by both the Paleo-Asian Ocean tectonic system and the circum-Pacific tectonic system, and is also intruded by the Caledonian to Yanshanian magma. A large number of endogenetic minerals related to magmatism have been formed in the area. Bed.
In this paper, the metallogenic geological conditions, mineralization characteristics and ore types of the deposits in the Cuihongshan ore concentration area are systematically investigated in the field, and the genetic relationship between them is explored. Three typical deposits in the area are anatomically studied. The lithofacies characteristics show that the rock mass closely related to the Cuihongshan skarn type deposit is medium thick. The granodiorite is mainly granodiorite related to the metallogenesis of the Huojihe porphyry type molybdenum deposit, and the rock mass related to the Kubin hydrothermal type deposit is mainly monzonite. The geochemical characteristics show that the SiO2 content of the samples is 66% and Na2O+K2O content is 66%. The content of K2O/Na2O ranges from 1.10 to 1.72, and the content of Al2O3 ranges from 12.45% to 14.90%. The samples belong to the quasi-aluminous high potassium calc-alkaline series. The REE partition curves show that the light REE is relatively rich and the heavy REE is relatively deficient. The rocks are characterized by type I and type A granites.
The LA-ICP-MS zircon U-Pb isotope results show that the weighted 206Pb/238U ages of granodiorite, monzogranite and biotite monzogranite are 484 4.7Ma, 198.9 1.6Ma and 1999.0.2Ma, respectively. Combined with the metallogenic ages of the Huojihe granodiorite and monzogranite bodies (184 Ma~186 Ma), it is considered that the Cuihongshan ore-bearing area was formed. The ore occurred mainly in the early part of Yanshan.
The strontium isotope results of Cuihongshan host rocks show that the 87Sr/86Sr ratio of Caledonian granodiorite is 0.76767605, indicating that the magma of this period may have formed in the melting of crustal materials; the 87Sr/86Sr ratio of Yanshanian granite is 0.717454 and 0.723593, with an average value of 0.720523, indicating the isotope characteristics of mixed magma. Sulfur isotope measurements of pyrite, galena and other metallic minerals in the Hongshan deposit show that the, Mixing, mantle derived sulfur and other metallogenic elements enter the crust derived magmatic system and participate in mineralization.
The results of temperature measurement of fluid inclusions in Cuihongshan deposit and Huojihe deposit show that the homogenization temperature of inclusions in Cuihongshan deposit is between 174.7 and 372.3 degrees centigrade, the homogenization temperature of inclusions in Cuihongshan deposit is between 240 and 280 degrees centigrade, the salinity is between (5.85-11.6)% NaCl eqv, and the homogenization temperature of inclusions in Huojihe deposit is between 141 and 353 degrees centigrade, and the peak is between 200 and 280 degrees centigrade. The salinity ranges from (1.22-9.73)% NaCl eqv. The ore-forming fluids have the characteristics of medium temperature-low salinity H2O-NaCl, and the salinity varies widely, suggesting that the ore-forming fluids mainly come from magmatic water and are mixed with some atmospheric water during the mineralization process.
The occurrence of skarn-hydrothermal Fe, Mo, Pb and Zn deposits is mainly distributed in the contact zone between Yanshanian intermediate-acidic intrusions and carbonate rocks. Porphyry Cu, Mo deposits are mainly formed in Yanshanian rocks and later hydrothermal silicification, potassium. In the Cuihongshan ore concentration area, the tectonic activities are frequent. The distribution of strata and magmatic rocks in the area is controlled by two groups of faults in NNE or near SN direction and NW direction, which provide a channel for the intrusion and migration of hydrothermal fluid in the later stage of magma, and then control the shape and scale of metal mineral deposits. The author divides the Cuihongshan ore concentration area into one ore-forming series, including two ore-forming subsequences, and preliminarily establishes a genetic model map of the deposit, which provides a favorable basis for regional ore prospecting, as well as for the discovery of new deposits in the mining area and the deep exploration of existing deposits. Mine work has pointed out the direction.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P611
本文编号：2232947
[Abstract]:The study of metallogenic series of ore deposits is an important idea to study the regional metallogenic regularity. It is a metallogenic belt located in the eastern section of Yichun-Yanshou metallogenic belt. The important component is located in the convergence zone of the Xiao Hinggan-Songnen and Jiamusi-Xingkai blocks. The area is influenced by both the Paleo-Asian Ocean tectonic system and the circum-Pacific tectonic system, and is also intruded by the Caledonian to Yanshanian magma. A large number of endogenetic minerals related to magmatism have been formed in the area. Bed.
In this paper, the metallogenic geological conditions, mineralization characteristics and ore types of the deposits in the Cuihongshan ore concentration area are systematically investigated in the field, and the genetic relationship between them is explored. Three typical deposits in the area are anatomically studied. The lithofacies characteristics show that the rock mass closely related to the Cuihongshan skarn type deposit is medium thick. The granodiorite is mainly granodiorite related to the metallogenesis of the Huojihe porphyry type molybdenum deposit, and the rock mass related to the Kubin hydrothermal type deposit is mainly monzonite. The geochemical characteristics show that the SiO2 content of the samples is 66% and Na2O+K2O content is 66%. The content of K2O/Na2O ranges from 1.10 to 1.72, and the content of Al2O3 ranges from 12.45% to 14.90%. The samples belong to the quasi-aluminous high potassium calc-alkaline series. The REE partition curves show that the light REE is relatively rich and the heavy REE is relatively deficient. The rocks are characterized by type I and type A granites.
The LA-ICP-MS zircon U-Pb isotope results show that the weighted 206Pb/238U ages of granodiorite, monzogranite and biotite monzogranite are 484 4.7Ma, 198.9 1.6Ma and 1999.0.2Ma, respectively. Combined with the metallogenic ages of the Huojihe granodiorite and monzogranite bodies (184 Ma~186 Ma), it is considered that the Cuihongshan ore-bearing area was formed. The ore occurred mainly in the early part of Yanshan.
The strontium isotope results of Cuihongshan host rocks show that the 87Sr/86Sr ratio of Caledonian granodiorite is 0.76767605, indicating that the magma of this period may have formed in the melting of crustal materials; the 87Sr/86Sr ratio of Yanshanian granite is 0.717454 and 0.723593, with an average value of 0.720523, indicating the isotope characteristics of mixed magma. Sulfur isotope measurements of pyrite, galena and other metallic minerals in the Hongshan deposit show that the, Mixing, mantle derived sulfur and other metallogenic elements enter the crust derived magmatic system and participate in mineralization.
The results of temperature measurement of fluid inclusions in Cuihongshan deposit and Huojihe deposit show that the homogenization temperature of inclusions in Cuihongshan deposit is between 174.7 and 372.3 degrees centigrade, the homogenization temperature of inclusions in Cuihongshan deposit is between 240 and 280 degrees centigrade, the salinity is between (5.85-11.6)% NaCl eqv, and the homogenization temperature of inclusions in Huojihe deposit is between 141 and 353 degrees centigrade, and the peak is between 200 and 280 degrees centigrade. The salinity ranges from (1.22-9.73)% NaCl eqv. The ore-forming fluids have the characteristics of medium temperature-low salinity H2O-NaCl, and the salinity varies widely, suggesting that the ore-forming fluids mainly come from magmatic water and are mixed with some atmospheric water during the mineralization process.
The occurrence of skarn-hydrothermal Fe, Mo, Pb and Zn deposits is mainly distributed in the contact zone between Yanshanian intermediate-acidic intrusions and carbonate rocks. Porphyry Cu, Mo deposits are mainly formed in Yanshanian rocks and later hydrothermal silicification, potassium. In the Cuihongshan ore concentration area, the tectonic activities are frequent. The distribution of strata and magmatic rocks in the area is controlled by two groups of faults in NNE or near SN direction and NW direction, which provide a channel for the intrusion and migration of hydrothermal fluid in the later stage of magma, and then control the shape and scale of metal mineral deposits. The author divides the Cuihongshan ore concentration area into one ore-forming series, including two ore-forming subsequences, and preliminarily establishes a genetic model map of the deposit, which provides a favorable basis for regional ore prospecting, as well as for the discovery of new deposits in the mining area and the deep exploration of existing deposits. Mine work has pointed out the direction.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P611
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