發(fā)布時(shí)間：2019-04-25 17:41

【摘要】：遼寧葫蘆島楊家杖子—鋼屯地區(qū)(簡稱楊鋼地區(qū))位于華北地臺北緣燕遼成礦帶其中之一的八家子—蘭家溝成礦帶內(nèi),地處遼寧西部,是一處重要的鉬多金屬成礦區(qū)。區(qū)內(nèi)斷裂構(gòu)造發(fā)育,巖漿活動(dòng)強(qiáng)烈,成礦條件十分有利。礦種以鉬、鉛鋅為主,礦床成因類型包括斑巖型、矽卡巖型和斑巖—矽卡巖型。筆者在大量的野外地質(zhì)工作的基礎(chǔ)上,通過系統(tǒng)收集、整理和總結(jié)前人的工作成果和認(rèn)識,重點(diǎn)選擇了區(qū)內(nèi)蘭家溝、楊家杖子、松樹卯3個(gè)典型礦床進(jìn)行研究。通過對典型礦床區(qū)域地質(zhì)背景、礦床地質(zhì)特征、成巖成礦年代學(xué)、控礦因素等方面的研究,總結(jié)了礦床成礦規(guī)律,并建立找礦模型。取得如下成果： 1、礦田內(nèi)太古界混合花崗巖和片麻巖類巖石為鉬成礦提供了礦源。當(dāng)其重熔沿基底斷裂上侵時(shí),深部巖漿中的鉬及其在上侵時(shí)捕獲的基底及蓋層圍巖中的鉬皆富集于礦液中,當(dāng)巖漿冷凝時(shí),含鉬礦液也隨巖漿的結(jié)晶不斷增多,當(dāng)物理化學(xué)條件改變時(shí),在一定的貯礦構(gòu)造中富集成礦 2、鉬礦床的形成和分布嚴(yán)格受構(gòu)造控制。礦床均產(chǎn)出于區(qū)域性NE向深大斷裂與EW向次級斷裂交匯部位。次級斷裂構(gòu)造及其衍生的低次序斷裂的規(guī)模、形態(tài)決定了礦體的規(guī)模、形態(tài),也決定了礦化、蝕變的強(qiáng)弱及分布范圍,具有明顯的多級、多期次構(gòu)造控礦特征。 3、矽卡巖型礦床賦礦地層主要為薊縣系灰?guī)r和寒武—奧陶系灰?guī)r、頁巖；斑巖型鉬礦主要與中生代中酸性復(fù)式侵入體有關(guān)。雖然成礦環(huán)境不盡一致,但礦床成礦物質(zhì)來源均為燕山期巖漿巖(虹螺山巖體)。 4、燕山期構(gòu)造—巖漿旋回是該區(qū)鉬礦床形成的主要時(shí)代,礦田內(nèi)與成礦有關(guān)的細(xì)�；◢弾r和花崗斑巖中鉬的豐度值皆高,經(jīng)電子探針測試得知細(xì)�；◢弾r和花崗斑巖中鉀長石是鉬的載體礦物,說明Mo來自花崗巖,特別是燕山期早侏羅世侵入的細(xì)�；◢弾r與成礦關(guān)系密切,是該區(qū)的成礦母巖。 5、以礦化帶為中心,蝕變出現(xiàn)脈狀鉀長石化、云英巖化→絹英巖化→硅化、伊利石化—水白云母化→鐵錳碳酸鹽化→綠泥石化→碳酸鹽化,而礦化主要與絹英巖化→硅化、伊利石化—水白云母化→鐵錳碳酸鹽化階段關(guān)系密切,可作為找礦標(biāo)志。 在總結(jié)了礦床成礦規(guī)律后,以成礦預(yù)測理論為指導(dǎo),結(jié)合近幾年礦山生產(chǎn)實(shí)踐,對礦區(qū)的資源潛力進(jìn)行了預(yù)測,認(rèn)為礦區(qū)仍具有很好的找礦空間和資源潛力。
[Abstract]:Yangjiazhang-Gangtun area, Huludao, Liaoning Province, is located in the Bajiazi-Lanjiagou metallogenic belt, one of the Yanliao metallogenic belts on the northern margin of North China. It is located in the western part of Liaoning Province and is an important molybdenum polymetallic metallogenic area. The fault structure is developed in this area, magmatic activity is strong, and the ore-forming conditions are very favorable. The ore types are mainly molybdenum, lead and zinc. The genetic types of the deposits include porphyry type, skarn type and porphyry-skarn type. On the basis of a great deal of field geological work, by systematically collecting, sorting out and summarizing the achievements and understandings of previous work, the author chooses three typical deposits of Lanjiagou, Yangjiazi and Songshu Mao in the district to carry on the research. By studying the regional geological background, geological characteristics, diagenetic and metallogenic chronology, ore-controlling factors of typical ore deposits, the ore-forming regularity of the deposits is summarized, and the ore-prospecting model is established. The results are as follows: 1. The Archean mixed granites and gneisses in the ore field provide the ore source for molybdenum mineralization. When the remelting occurs along the basement fault, the molybdenum in the deep magma and in the basement and the surrounding rock of the capping layer are enriched in the ore fluid, and when the magma condenses, the molybdenum-bearing ore fluid increases with the crystallization of the magma, and the molybdenum in the deep magma and the basement and the surrounding rock in the capping layer are all concentrated in the ore solution when the magma condenses. When the physical and chemical conditions change, the integrated ore 2 is enriched in certain ore storage structures, and the formation and distribution of molybdenum deposits are strictly controlled by the structure. The deposits occur at the intersection of regional NE-trending deep and large faults and EW-trending secondary faults. The size and shape of the secondary fault structure and its derived low-order faults determine the size and shape of the orebody, as well as the strength and distribution range of mineralization and alteration, and have obvious multi-stage and multi-stage structural ore-controlling characteristics. 3. The ore-bearing strata of skarn deposits are mainly Jixian limestone and Cambrian-Ordovician limestone and shale, and porphyry molybdenum deposits are mainly related to Mesozoic intermediate-acid complex intrusions. Although the ore-forming environment is not identical, the ore-forming materials of the deposit are all derived from the Yanshanian magmatic rock (Hongluoshan rock mass). 4. The Yanshanian tectonic-magmatic cycle is the main age of the formation of molybdenum deposits in this area, and the abundance of molybdenum in fine granitic granites and granitic porphyry related to mineralization in the ore field is high. The K-feldspar in fine-grained granite and granite porphyry is the carrier mineral of molybdenum, which indicates that Mo comes from granite, especially the fine-grained granite intruded in Yanshanian early Jurassic is closely related to mineralization and is the ore-forming parent rock of this area. (5) taking the mineralized zone as the center, the alteration appeared vein-like potassium feldspar, Muscovite-sericite silicification, Ili-hydroMuscovite-ferromanganese carbonated, green-mudstone carbonated, and mineralized and sericite-silicified, and the mineralization was mainly related to the silicification of sericite, and the mineralization was mainly related to the silicification of sericite. The Ili-hydroMuscovite-ferromanganese carbonate stage is closely related and can be used as a prospecting indicator. Based on the theory of ore-forming prediction and the practice of mine production in recent years, the resource potential of the ore deposit is predicted, and it is considered that the ore-forming area still has good prospecting space and resource potential in the ore-forming area under the guidance of the ore-forming prediction theory and combined with the practice of mine production in recent years.
【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】：P618.2

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相關(guān)期刊論文 前10條

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本文編號：2465328