本文選題：碳酸鹽巖地層 + 鉛鋅銀多金屬礦床��； 參考：《石家莊經(jīng)濟學(xué)院》2015年碩士論文

【摘要】：張家口地區(qū)大地構(gòu)造位置處于華北地臺北緣,是河北省重要的鉛鋅銀多金屬礦產(chǎn)富集區(qū)。以往工作主要集中在張家口北部,已發(fā)現(xiàn)的蔡家營、青羊溝等大、中型鉛鋅礦均產(chǎn)出于北部內(nèi)蒙地軸中。張家口南部中—上元古代碳酸鹽巖蓋層和燕山期中酸性巖體分布廣泛,構(gòu)造運動強烈,具備形成層控碳酸鹽巖型和矽卡巖型鉛鋅銀多金屬礦床的優(yōu)越地質(zhì)條件。在碳酸鹽巖地層對鉛鋅銀多金屬礦床的成礦制約問題上,由于研究程度較低,找礦工作長期以來未取得突破性進展。為了清楚地了解礦床地質(zhì)特征,準(zhǔn)確地劃分礦床類型,系統(tǒng)地掌握成礦規(guī)律,有效地提供找礦方向,此次研究根據(jù)張家口地區(qū)地質(zhì)成礦條件和收集的相關(guān)資料,將張家口南部與碳酸鹽巖地層有關(guān)的鉛鋅銀多金屬礦床分布區(qū)作為研究區(qū),涉及宣化區(qū)、赤城縣、懷來縣、涿鹿縣等區(qū)域。研究區(qū)大地構(gòu)造位置處于華北地臺北緣中段燕山裂陷帶內(nèi)。本次工作建立在基礎(chǔ)地質(zhì)研究的基礎(chǔ)上,了解研究區(qū)巖漿構(gòu)造特征及演化規(guī)律、地層分布及其特征;以賦存在霧迷山組白云巖地層中的赤城梁家溝礦床和賦存在霧迷山組白云巖與燕山期中酸性巖體接觸帶的涿鹿孟家窯礦床為例進行研究,對所采集巖(礦)石樣品進行室內(nèi)鏡下光、薄片鑒定,以及微量元素、稀土元素地球化學(xué)分析測試,初步厘定梁家溝礦床為MVT型鉛鋅銀多金屬礦床,孟家窯礦床為矽卡巖型鉛鋅銀多金屬礦床。同時,根據(jù)研究區(qū)地質(zhì)地貌特點,在碳酸鹽巖出露區(qū)選取3條路線地球化學(xué)剖面,以分析碳酸鹽巖地層沉積環(huán)境和地層含礦性,厘定鉛鋅銀多金屬礦床與中—上元古代碳酸鹽巖地層之間的成因聯(lián)系及其對成礦的控制作用。研究認(rèn)為區(qū)內(nèi)高于莊組、霧迷山組白云巖發(fā)育于潮上帶和潮間帶環(huán)境,與鉛鋅銀多金屬礦床的形成關(guān)系密切,特別是角礫云巖,其溶孔和裂隙發(fā)育,有利于成礦熱液的沉淀。本次工作為今后張家口南部地區(qū)與碳酸鹽巖地層相關(guān)的鉛鋅銀多金屬礦床找礦預(yù)測提供理論依據(jù)。
[Abstract]:The tectonic location of Zhangjiakou area is located on the margin of North China platform, and is an important rich area of lead, zinc and silver polymetallic minerals in Hebei Province. The previous work was mainly concentrated in the northern part of Zhangjiakou. The large and medium-sized lead-zinc deposits such as Cai Jiaying and Qingyanggou have been found in the northern Inner Mongolia axis. The middle and upper Proterozoic carbonate caprocks and Yanshanian acid rock bodies in the south of Zhangjiakou are widely distributed and have strong tectonic movement, which have favorable geological conditions for the carbonate type and skarn type lead, zinc and silver polymetallic deposits controlled by cambium. Because of the low degree of research, no breakthrough has been made in prospecting for a long time in the problem of carbonate strata restricting the mineralization of lead-zinc-silver polymetallic deposits. In order to clearly understand the geological characteristics of the deposit, divide the deposit types accurately, master the metallogenic rules systematically, and provide the prospecting direction effectively, this study is based on the geological metallogenic conditions and the relevant data collected in Zhangjiakou area. The study area of lead-zinc-silver polymetallic deposits related to carbonate strata in the south of Zhangjiakou is concerned with Xuanhua area, Chicheng County, Huailai County, Zhuolu County and so on. The tectonic position of the study area is located in the Yanshanian rift belt in the middle of the North China platform. This work is based on the basic geological research to understand the characteristics of magmatic structure and evolution, stratigraphic distribution and characteristics in the study area. Taking the Chicheng Liangjiagou deposit in the dolomite strata of the Wumishan formation and the Zhuolu Mengjiayao deposit in the contact zone between the dolomite of the Wumishan formation and the Yanshanian intermediate acid rock mass as examples, The samples of rock (ore) stone collected were identified by indoor microscope, thin slice identification and geochemical analysis of trace elements and rare earth elements. It was preliminarily determined that the Liangjiagou deposit is a MVT type lead-zinc-silver polymetallic deposit. The Mengjiayao deposit is a skarn-type lead-zinc-silver polymetallic deposit. At the same time, according to the geological and geomorphological characteristics of the study area, three geochemical sections are selected in the carbonate outburst area to analyze the sedimentary environment of carbonate strata and the ore-bearing properties of the carbonate strata. The genetic relationship between the lead-zinc-silver polymetallic deposits and the Meso-Upper Proterozoic carbonate strata and their control over the mineralization are determined. It is considered that dolomite of Wumishan formation is developed in the upper tidal zone and intertidal zone environment, which is closely related to the formation of lead, zinc and silver polymetallic deposits, especially the breccia dolomite, whose dissolution pores and fractures develop, which is conducive to the deposit of ore-forming hydrothermal solution. This work provides a theoretical basis for prospecting and prediction of lead-zinc-silver polymetallic deposits related to carbonate strata in the southern area of Zhangjiakou.
【學(xué)位授予單位】：石家莊經(jīng)濟學(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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