本文選題：洞子溝　切入點(diǎn)：多金屬礦床　出處：《石家莊經(jīng)濟(jì)學(xué)院》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：本文以河北興隆洞子溝銀銅多金屬礦床為研究對象,在對研究區(qū)實(shí)地調(diào)研與室內(nèi)測試分析結(jié)果結(jié)合的基礎(chǔ)上,詳細(xì)分析研究了洞子溝銀銅礦的成礦地質(zhì)特征、成礦時代、控礦因素,以及對礦床成因進(jìn)行了初步的探討,在此基礎(chǔ)上取得以下認(rèn)識:(1)通過詳細(xì)的野外地質(zhì)調(diào)查及蝕變巖的研究發(fā)現(xiàn),常州溝組砂巖與礦床成因關(guān)系密切。研究表明,其不僅作為礦床的容礦圍巖,同時為礦床提供了部分成礦物質(zhì),為本區(qū)的礦源層。常州溝組砂巖可作為重要的找礦層位。礦床的圍巖蝕變類型有硅化、綠泥石化和黃鐵礦化。硅化、綠泥石化、黃鐵礦化可作為重要的找礦標(biāo)志。(2)本區(qū)主要的導(dǎo)礦構(gòu)造為將軍關(guān)-黃崖關(guān)斷裂。主要的容礦構(gòu)造為主斷裂兩側(cè)的次級斷裂及層間滑動構(gòu)造產(chǎn)生的斷裂。礦區(qū)的構(gòu)造主體為一寬緩的背斜,該背斜屬于馬蘭峪復(fù)式背斜向西傾伏的一部分。據(jù)本次研究工作,該褶皺構(gòu)造與洞子溝礦床成因有密切聯(lián)系。(3)研究區(qū)礦體空間分布具有順層產(chǎn)出的特征。局部表現(xiàn)為穿層現(xiàn)象和分支復(fù)合的現(xiàn)象。礦體在褶皺的轉(zhuǎn)折端和傾伏端有厚度變大、品位變富的特征。礦石主要由黝銅礦、方鉛礦、閃鋅礦、黃鐵礦組成。經(jīng)過分析測試,銀、銅主要賦存在黝銅礦中,黝銅礦含量越高,銀、銅品位越富。礦石結(jié)構(gòu)主要為交代結(jié)構(gòu)、交代殘余結(jié)構(gòu)、鑲邊結(jié)構(gòu)等;構(gòu)造主要為條帶狀構(gòu)造、塊狀構(gòu)造、角礫狀構(gòu)造等。(4)通過野外地質(zhì)調(diào)查以及對手標(biāo)本、光薄片的系統(tǒng)觀察,以及其巖石地球化學(xué)特征的研究,筆者認(rèn)為礦區(qū)內(nèi)與成礦關(guān)系密切的火成巖為大紅峪期的火成巖,巖石類型主要為堿性基性巖類,巖石系列為鉀質(zhì)玄武巖類,具有富鉀富堿的特點(diǎn)。(5)在對成礦溫度研究中,本次工作主要根據(jù)前人對礦石中硫化物和石英的流體包裹體均一法和爆裂法溫度的測試結(jié)果,認(rèn)為洞子溝礦床的成礦溫度應(yīng)為中低溫環(huán)境。(6)在成礦年齡方面,洞子溝銀銅礦床單階段模式鉛年齡平均為(1635~1721)Ma。為了更加準(zhǔn)確的限定礦床的成礦年齡,本次研究同時結(jié)合了前人對礦石容礦圍巖常州溝組地層年齡的測定結(jié)果(1800)Ma、與礦體相互切割的脈巖年齡(1521±4)Ma。最終確定了成礦年齡為中元古代的大紅峪期。(7)在對礦床成因研究方面本次工作充分利用了礦石礦物鉛同位素地球化學(xué)特征探討成礦物質(zhì)的可能來源,3個樣品的測試結(jié)果反映了成礦物質(zhì)來源可能為深部的下地殼或上地幔附近,即成礦物質(zhì)具有深源性特征。前人對礦區(qū)內(nèi)的硫化物作了硫同位素測試工作。硫同位素地球化學(xué)特征同樣說明了成礦物質(zhì)具有深源性的特點(diǎn)。在以上系統(tǒng)研究工作的基礎(chǔ)上提出洞子溝礦床的成因類型為具層控性質(zhì)的沉積疊加改造型礦床。
[Abstract]:In this paper, taking the Dongzigou silver-copper polymetallic deposit in Xinglong, Hebei Province as the research object, the metallogenic geological characteristics and metallogenic age of the Dongzigou silver-copper deposit are analyzed in detail on the basis of the results of field investigation and laboratory test and analysis in the study area. The ore-controlling factors and the genesis of the deposit are preliminarily discussed. On the basis of this, the following understandings are obtained: (1) based on detailed field geological survey and alteration rock study, it is found that the sandstone of Changzhou Gou formation is closely related to the genesis of the deposit, and the study shows that the sandstone of Changzhou formation is closely related to the genesis of the deposit. It not only serves as the host rock of the deposit, but also provides part of the ore-forming material for the deposit and is the source bed of this area. The sandstone of Changzhou Gou formation can be used as an important ore-finding horizon. The alteration type of the surrounding rock of the deposit is silicified. Green-mud fossilization and pyritization. Silicification, green-mud fossilization, The main ore-conducting structure in this area is Jiangjun Guan-Huangyaguan fault. The main ore-bearing tectonics are secondary faults on both sides of faults and faults produced by interlayer sliding tectonics. The main body is a gentle anticline, The anticline is a part of the Malanyu compound anticline that is lying westward. According to this study, The fold structure is closely related to the genesis of the Dongzigou deposit.) the spatial distribution of the orebody in the study area is characterized by the occurrence of bedding. The local manifestation is the phenomenon of interlayer crossing and branch compounding. The orebody has a thicker thickness at the turning end of the fold and at the tip of the tilting volt. The ore is mainly composed of tetrahedrite, galena, sphalerite and pyrite. After analysis and test, silver and copper mainly occur in tetrahedrite. The higher the content of tetrahedrite, the more silver, The ore structure is mainly metasomatic structure, metasomatic remnant structure, edge structure, etc.; the structure is mainly strip structure, block structure, breccia structure, etc.) through field geological survey and adversary specimen, the ore structure is mainly metasomatic structure, metasomatic residual structure, edge structure, etc. The systematic observation of the light sheet and the study of its petrogeochemical characteristics indicate that the igneous rocks closely related to mineralization are igneous rocks of the Dahongyu period, and the main types of rocks are alkaline basic rocks. In the study of ore-forming temperature, this work is mainly based on the results of previous tests on the temperature of fluid inclusions and burst methods of sulfide and quartz in ores. It is considered that the ore-forming temperature of the Dongzigou deposit should be moderate-low temperature environment. (6) in terms of metallogenic age, the average lead age of the sheet stage model of Dongzigou silver copper deposit is 1635 ~ 1721 Ma. In order to define the metallogenic age of the deposit more accurately, At the same time, this study combined with the results of the previous determination of strata age of Changzhou Gou formation of ore-bearing surrounding rock and dike rock age of 1521 鹵4 Ma. Finally, the metallogenic age of the ore deposit was determined to be the Dahonghongyu epoch of the Middle Proterozoic. As a result of this work, the possible sources of ore-forming materials have been explored by fully utilizing the geochemical characteristics of lead isotopes of ore minerals. The results of the tests of three samples indicate that the ore-forming materials may originate from the deep lower crust or near the upper mantle. That is, the ore-forming material has the characteristics of deep source. The former has done the sulfur isotope test to the sulfides in the mining area. The geochemical characteristics of sulfur isotope also show that the ore-forming material has the characteristics of deep source. The genetic type of Dongzigou deposit is sedimentary superimposed and reformed deposit with stratabound property.
【學(xué)位授予單位】：石家莊經(jīng)濟(jì)學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.2

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