本文關(guān)鍵詞： 賽什塘地區(qū)銅多金屬礦床成礦規(guī)律鋯石 U-Pb 同位素測年　出處：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：賽什塘地區(qū)位于東昆侖和西秦嶺接合部位,地處青海省興�？h,鄂拉山的東南部,隸屬鄂拉山多金屬礦帶的賽什塘-日龍溝亞礦帶。由于地處高寒地區(qū),加之地質(zhì)構(gòu)造復(fù)雜等因素,制約了對該區(qū)礦床成因類型和控礦因素的認(rèn)識,目前找礦工作遇到了“瓶頸”。因此,選擇賽什塘和銅峪溝兩個(gè)銅多金屬礦開展成礦規(guī)律及礦床成因的研究,為下一步找礦方向提供理論依據(jù)。在前人研究基礎(chǔ)上,通過野外調(diào)研和室內(nèi)綜合分析,依據(jù)巖漿成礦學(xué)理論,從構(gòu)造特征、巖漿性質(zhì)、成礦期次等分析入手,對賽什塘地區(qū)銅多金屬礦進(jìn)行成礦規(guī)律研究。取得了如下成果和認(rèn)識:1.研究區(qū)位于東昆侖與西秦嶺造山帶的接合部位,屬于秦祁昆造山系的一部分,由東昆侖和西秦嶺兩大構(gòu)造單元組成,受鄂拉山構(gòu)造帶影響,區(qū)內(nèi)廣泛分布有火山巖,產(chǎn)于二疊紀(jì)和三疊紀(jì)地層中。夾在海相沉積地層中的火山沉積建造是主要的賦礦層位,礦體主要產(chǎn)于火山噴發(fā)的間歇期-火山碎屑沉積巖的夾層中;研究區(qū)內(nèi)的侵入巖主要分為四期,與成礦作用密切的是第二期侵入的中酸性侵入體;該區(qū)成礦背景屬于板內(nèi)裂谷構(gòu)造環(huán)境。2.研究區(qū)內(nèi)有兩期成礦作用。早期為火山沉積成礦,礦體主要產(chǎn)于海相火山沉積建造中,早期成礦時(shí)代為晚三疊世早期,與鄂拉山組時(shí)代相當(dāng),成礦主要為Cu、Pb、Zn、Sn;晚期成礦與中酸性巖體侵入作用有關(guān),晚期成礦時(shí)代為晚三疊世中期,晚期成礦主要為Cu、Pb、Zn、Sn、Mo。綜合分析認(rèn)為,賽什塘地區(qū)礦床成因類型為早期火山沉積型疊加晚期矽卡巖-斑巖型銅多金屬礦。3.研究區(qū)內(nèi),由于早期成礦礦體多賦存于晚三疊世的海相火山沉積地層中,因此沿各礦床中主要含礦層位繼續(xù)追索是找礦突破口之一;晚期成礦與三疊紀(jì)晚期的石英閃長巖和花崗閃長巖侵入體有關(guān),因此應(yīng)對研究區(qū)內(nèi)出露的中酸性侵入巖體重點(diǎn)勘查;對1:50萬遙感影像圖中的環(huán)形構(gòu)造區(qū)進(jìn)行了重點(diǎn)勘探,環(huán)形構(gòu)造指示可能有火山機(jī)構(gòu)的存在,并且火山機(jī)構(gòu)與成礦密切相關(guān)。
[Abstract]:The Sesitang area is located at the junction of East Kunlun and West Qinling, located in Xinghai County, Qinghai Province, in the southeast of Ora Mountain, belonging to the Sesitang-Rilonggou sub-ore belt of the Ela Mountain polymetallic ore belt. It is located in the alpine area. In addition, the complex geological structure and other factors restrict the understanding of the genetic types and ore-controlling factors of the ore deposits in this area, so the prospecting work has encountered a "bottleneck" at present. Two copper polymetallic ore deposits, Sesitang and Tongyugou, are selected to study the metallogenic regularity and genesis of the deposit, which provides the theoretical basis for the next prospecting direction. On the basis of previous studies, field investigation and indoor comprehensive analysis are carried out. Based on the theory of magmatic metallogeny, the structural characteristics, magmatic properties and secondary metallogenic stages are analyzed. The metallogenic regularity of copper polymetallic deposits in Sesitang area has been studied. The following results and understandings have been obtained. 1. The study area is located at the junction of East Kunlun and West Qinling orogenic belts and is part of the Qi-Kun orogenic system. It is composed of two tectonic units, East Kunlun and West Qinling, and is widely distributed in the area under the influence of the Ora Mountain tectonic belt. The volcanic sedimentary formation intercalated in marine sedimentary strata is the main ore-bearing bed, and the orebody mainly occurs in the intercalation of volcanic eruption-volcanic clastic sedimentary rocks. The intrusive rocks in the study area are mainly divided into four stages, and the intermediate-acid intrusions in the second stage are closely related to mineralization. The metallogenic background of this area belongs to the intraplate rift tectonic environment. 2. There are two stages of mineralization in the study area. In the early period, volcanic deposits were formed, and the orebodies mainly occurred in marine volcanic sedimentary formations. The early metallogenic age is the early late Triassic, which is similar to that of the Orashan formation. The late mineralization is related to the intrusion of intermediate-acid rock mass, the late metallogenic age is the middle stage of the late Triassic, and the late mineralization is mainly the Cu PbPbZZZZZN SnMo.The comprehensive analysis shows that the metallogenic age of the late stage is the middle of the late Triassic. The genesis type of Sesitang deposit is the early volcanic sedimentary type superimposed late skarn porphyry copper polymetallic ore. 3. In the study area, the early metallogenic bodies mostly occurred in the marine volcanic sedimentary strata of the late Triassic. Therefore, the continuous tracing along the main ore-bearing strata in each ore deposit is one of the breakthrough points for prospecting. The late mineralization is related to the quartz diorite and granodiorite intrusions in the late Triassic. An important exploration of the ring tectonic area in the 1:50 remote sensing image is carried out. The ring structure indicates that there may be a volcanic mechanism, and the volcanic mechanism is closely related to the mineralization.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.2

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本文編號：1467439