【摘要】：礦床成礦系列研究是研究區(qū)域成礦規(guī)律的一種重要思想，探索同一地質(zhì)時期、同一地質(zhì)時代下形成的不同類型之間的礦床成因聯(lián)系，與指導(dǎo)找礦及礦產(chǎn)資源開發(fā)利用有最直接的關(guān)系。翠宏山礦集區(qū)位于伊春-延壽成礦帶東段，是成礦帶重要的組成部分，處于小興安嶺-松嫩地塊和佳木斯-興凱地塊的拼合活動帶上。區(qū)域上受到古亞洲洋構(gòu)造體系和環(huán)太平洋構(gòu)造體系的雙重影響，又受到加里東期至燕山期的多期巖漿侵入，區(qū)內(nèi)形成了大批與巖漿活動作用有關(guān)的內(nèi)生礦床。 本文通過對翠宏山礦集區(qū)內(nèi)礦床的成礦地質(zhì)條件、礦化特征及礦石類型進(jìn)行了野外的系統(tǒng)調(diào)研，探索他們之間的成因聯(lián)系，并對礦集區(qū)內(nèi)3個典型礦床進(jìn)行了解剖性研究。巖相學(xué)特征顯示，與翠宏山矽卡巖型礦床密切相關(guān)的巖體為中粗粒二長花崗巖，局部相變?yōu)楹谠颇付L花崗巖，花崗閃長巖與成礦關(guān)系不大；與霍吉河斑巖型鉬礦呈成礦有關(guān)的巖體主要為花崗閃長巖；與庫濱熱液型礦床有關(guān)的巖體主要為二長花崗巖。地球化學(xué)特征顯示，樣品SiO2含量均66%, Na2O+K2O含量介于7.84%~9.39%之間，K2O/Na2O介于1.10~1.72之間，Al2O3含量在12.45%~14.90%之間，樣品均屬于準(zhǔn)鋁質(zhì)高鉀鈣堿性系列。微量元素地球化學(xué)特征顯示，翠宏山礦集區(qū)內(nèi)樣品均具有富集Rb、K等大離子親石元素，虧損Nb、Ta、Ti、P等虧損高場強(qiáng)元素的特點(diǎn)，稀土元素配分曲線特征顯示出輕稀土相對富集、重稀土相對虧損的特點(diǎn)，巖體具有I型和A型花崗巖的特征。 LA-ICP-MS鋯石U-Pb同位素結(jié)果顯示，花崗閃長巖、二長花崗巖和黑云母二長花崗巖的206Pb/238U年齡加權(quán)平均值為分別為484±4.7Ma、198.9±1.6Ma和199.0±3.2Ma。結(jié)合霍吉河花崗閃長巖和二長花崗巖的巖體成礦年齡（184Ma~186Ma），認(rèn)為翠宏山礦集區(qū)的成礦作用主要發(fā)生在燕山早期。 翠宏山賦礦巖體鍶同位素結(jié)果表明，加里東期花崗閃長巖的87Sr/86Sr比值為0.767605，標(biāo)明該期巖漿可能形成于殼源物質(zhì)的熔融；燕山期花崗巖87Sr/86Sr比值分別為0.717454和0.723593，平均值為0.720523，具有混染巖漿所具有的同位素特征。結(jié)合翠宏山礦床黃鐵礦、方鉛礦等金屬礦物硫同位素測試δ34S介于1.2‰~5.78‰之間，接近幔源硫（-3‰δ34S3‰），暗示了燕山期這賦礦的殼源巖漿可能形成于幔源玄武質(zhì)巖漿的底侵作用誘發(fā)的下地殼部分熔融，并且與幔源玄武質(zhì)巖漿發(fā)生了殼幔混染作用，幔源的硫及其它成礦元素進(jìn)入到殼源巖漿系統(tǒng)參與成礦 翠宏山礦床和霍吉河礦床流體包裹體測溫結(jié)果顯示，翠宏山礦床包裹體均一溫度在174.7℃~372.3℃之間，主體均一溫度在240℃~280℃之間，鹽度集中在（5.85~11.6）%NaCl eqv之間；霍吉河礦床包裹體均一溫度介于141℃~353℃之間，峰值在200℃~280℃之間，鹽度處于（1.22~9.73）%NaCl eqv范圍內(nèi)。成礦流體均具有中溫-低鹽度的H2O-NaCl的特點(diǎn)，鹽度變化范圍較大，暗示成礦流體主要來自于巖漿水，在成礦過程中混入有部分大氣水。 通過對礦集區(qū)內(nèi)典型礦床的解剖性研究。礦床的產(chǎn)出具有一定的專屬性，矽卡巖型-熱液型Fe、Mo、Pb、Zn礦床主要分布在燕山期中酸性侵入體和碳酸鹽巖地層的接觸帶上。斑巖型礦床Cu、Mo礦床主要形成于燕山期巖體與后期熱液發(fā)生硅化、鉀長石化等熱液蝕變帶上。翠宏山礦集區(qū)內(nèi)構(gòu)造活動頻繁，NNE向或近SN向與NW向的兩組斷裂交錯控制著區(qū)內(nèi)地層及巖漿巖的分布，更為巖漿后期熱液的侵入和運(yùn)移提供了通道，進(jìn)而控制了金屬礦物的儲存和礦床產(chǎn)出的形態(tài)和規(guī)模，因此在兩組斷裂的交匯部位是翠宏山礦集區(qū)內(nèi)礦床成礦的有利部位。筆者將翠宏山礦集區(qū)劃分成1個礦床成礦系列，包含2個成礦亞系列，，并初步建立了礦床成因模型圖，為區(qū)域找礦提供了有利依據(jù)，也為礦區(qū)內(nèi)新礦床發(fā)現(xiàn)及已有礦床的深部找礦工作指明了方向。
[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.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P611

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