本文選題：地球化學(xué)異常模式 + 多屬性異常　； 參考：《中國地質(zhì)大學(xué)(北京)》2016年博士論文

【摘要】：獅子山礦田位于長江中下游鐵-銅-金多金屬成礦帶中段的銅陵礦集區(qū),分布有胡村南、刺山等眾多銅金多金屬礦床,礦床分布受斷裂構(gòu)造、層間滑脫構(gòu)造、接觸帶構(gòu)造控制,與燕山期中酸性侵入巖密切相關(guān)。論文在前人的工作基礎(chǔ)上,以典型斑巖-矽卡巖型銅鉬金多金屬礦床為研究對象,分析了元素異常特征、硫鉛同位素組成、流體包裹體特征,重點(diǎn)查明了礦田內(nèi)地質(zhì)體的元素組成及遷移規(guī)律,構(gòu)建了地質(zhì)-地球化學(xué)異常模式,探討了控礦作用及其地球化學(xué)響應(yīng)機(jī)制。論文取得了如下認(rèn)識(shí):1.礦田內(nèi)泥盆紀(jì)-三疊紀(jì)地層、燕山期中酸性侵入巖及蝕變巖中富集成礦元素(Cu、Mo、Au)、伴生元素(Ag、As、Sb、Bi、Cd、Sb、W等)和礦化劑元素(S),虧損Ba、Sr、CaO、Na2O。礦田成礦地球化學(xué)系統(tǒng)中,元素帶入、帶出強(qiáng)烈,形成了大規(guī)模的正、負(fù)異常。2.礦田地表的元素異常和深部異常相吻合,Cu、Mo、Au元素正異常圍繞主礦體產(chǎn)出,對多金屬礦化具有直接的指示意義;Sr負(fù)異常緊鄰矽卡巖礦體產(chǎn)出,是快速識(shí)別礦化體位置的有效指標(biāo)。S的正異常和Ba、Na2O的負(fù)異常涵蓋了整個(gè)成礦作用區(qū)域,深部依然存在,暗示可能存在隱伏多金屬礦化體。3.礦田內(nèi)存在由Ba、Sr、Na2O負(fù)異常體系,礦化劑元素S異常體系,S與Fe、Cu、Mo間協(xié)同平衡體系,Cu、Mo、Ag、W等成礦及其伴生元素異常體系,以及Zr、Hf元素質(zhì)量守恒體系構(gòu)成的多屬性異常體系,其受地層、巖漿巖與疊加構(gòu)造共同控制。4.獅子山礦田內(nèi)Cu、Mo、Au、S等成礦物質(zhì)主要來自深部巖漿及黃龍-船山組(C2+3)、棲霞組(P1q)、孤峰組(P1g)、大隆組(P2d)、龍?zhí)督M(P2l)、和龍山組(P2h)、殷坑組(T1y)等高硫地層;巖漿巖在提供成礦物質(zhì)的同時(shí),也為成礦物質(zhì)活化、遷移提供了重要流體和熱源。5.礦田內(nèi)含礦流體在構(gòu)造應(yīng)力、揮發(fā)分壓力、靜巖壓力、地溫梯度差和反向構(gòu)造壓力的疊加作用下,經(jīng)歷了從高溫、高鹽度向中低溫、中低鹽度演化的連續(xù)過程,形成了多金屬礦化與元素異常。6.構(gòu)建了礦床、礦田尺度的地質(zhì)-地球化學(xué)異常模式,這為銅陵礦集區(qū)開展地球化學(xué)勘查找礦工作和異常評價(jià)提供了依據(jù)。
[Abstract]:The Shizishan ore field is located in the Tongling ore concentration area in the middle and lower reaches of the iron-copper gold polymetallic metallogenic belt of the Yangtze River. There are many copper-gold polymetallic deposits, such as Hucuonnan and Caishan, which are controlled by fault structure, interlayer detachment structure and contact zone structure. It is closely related to acid intrusive rocks in Yanshanian period. On the basis of previous work, this paper takes the typical porphyry skarn type copper-molybdenum polymetallic deposit as the research object, and analyzes the characteristics of element anomaly, sulfur and lead isotopic composition, fluid inclusions. The elemental composition and migration law of the plastids in the interior of the ore field are found out emphatically, the geo-geochemical anomaly model is constructed, and the ore-controlling action and its geochemical response mechanism are discussed. The thesis has gained the following understanding: 1. In Devonian and Triassic strata, the ore-rich elements in the acidic intrusive rocks and altered rocks in the Yanshanian period are Cu, Mo, au, and the associated elements, the Ag-As-SbSbSbSbSbOW) and the mineralizing agent elements, Sch, and depleted Ba-Sr-CaONa _ 2O. In the ore-forming geochemical system, elements are brought in and brought out strongly, forming large-scale positive and negative anomalies. 2. The surface element anomalies and deep anomalies coincide with the positive anomalies around the main orebody, and have direct indication for polymetallic mineralization. The negative anomaly of Sr is close to the occurrence of skarn orebody. The positive anomaly of .S and the negative anomaly of Ba-Na _ 2O cover the whole metallogenic area, and still exist in the deep part, suggesting that there may be a concealed polymetallic mineralization body .3. In the ore field, there is a multi-attribute anomalous system consisting of the negative anomaly system of Ba-Sr-Na _ 2O, the system of synergetic equilibrium between the mineralizer S system and the Fe _ (Cu) Cu _ (Mo) and its associated element anomaly system, and the mass conservation system of zirconium HF elements. Magmatic rocks and superimposed structures jointly control .4. In the Shizishan Orefield, the ore-forming materials such as Cu-Mo Mo-Au-S are mainly derived from high sulfur formations such as deep magma and Huanglong-Chuanshan formation (C23), Qixia formation (P1q1), Gupeng formation (P1gng), Dalong formation (P2dN), Longtan formation (P2lhe), Longshan formation (P2h), Yinkeng formation (T1y), etc. The magmatic rocks provide the ore-forming materials at the same time. It also provides an important fluid and heat source for the activation and migration of ore-forming materials. Under the superposition of tectonic stress, volatile pressure, static rock pressure, geothermal gradient difference and reverse tectonic pressure, the ore-bearing fluid in the ore field has undergone a continuous process of evolution from high temperature, high salinity to middle low temperature and low salinity. Polymetallic mineralization and element anomaly. 6. The geological geochemical anomaly model on the scale of ore deposit and ore field is constructed, which provides a basis for geochemical prospecting and anomaly evaluation in Tongling ore concentration area.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：P618.2

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