本文關(guān)鍵詞： 閩中 梅仙鉛鋅礦田 馬面山群東巖組 變質(zhì)巖層序 原巖恢復(fù)　出處：《南京大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：梅仙鉛鋅礦田形成于閩中大陸裂谷環(huán)境中,鉛鋅礦體主要賦存于新元古界馬面山群綠片巖相的變質(zhì)巖系內(nèi),層位和巖性控制特征顯著。礦田以尤溪河為界分為河西(以丁家山礦區(qū)為代表)和河?xùn)|(以峰巖礦區(qū)為代表)兩部分,然而,礦田內(nèi)不同礦區(qū)之間在賦礦變質(zhì)巖系的巖性定名、層位劃分及礦體特征等方面存在明顯差異,導(dǎo)致不同礦區(qū)之間層位難以對(duì)比,給找礦預(yù)測(cè)工作帶來較大困難。本文在充分研究前人成果的基礎(chǔ)上,通過對(duì)馬面山群變質(zhì)巖層序及地球化學(xué)特征的分析研究,對(duì)梅仙地區(qū)鉛鋅礦賦礦變質(zhì)巖系的地層進(jìn)行了劃分對(duì)比:梅仙礦田新元古界馬面山群變質(zhì)巖系自老至新為龍北溪組、東巖組。龍北溪組為巖性主要為石英云母片巖、長(zhǎng)石石英片巖、大理巖、石英巖等"淺色片巖"夾有少量薄層"綠片巖",根據(jù)其巖石化學(xué)與稀土元素特征,經(jīng)原巖恢復(fù),龍北溪組為下伏于東巖組的一套巨厚的海相硅質(zhì)、鈣鎂質(zhì)、半粘土質(zhì)、泥砂質(zhì)沉積變質(zhì)巖系,間隙有小規(guī)模的基性-超基性巖漿噴發(fā)。該組在梅仙地區(qū)僅丁家山礦區(qū)有所揭露,且與上覆東巖組整合接觸,表明丁家山礦區(qū)的賦礦巖系為東巖組的底部。東巖組由多組"淺色片巖"-"綠片巖"巖性旋回組成。"淺色片巖"主要為云母片巖、長(zhǎng)石綠簾石石英片巖、大理巖、鈉長(zhǎng)變粒巖等;"綠片巖"主要為綠簾石、透輝石、綠泥石、陽起石等綠色礦物組成的巖石系列,為礦田內(nèi)鉛鋅礦的主要賦礦層位。根據(jù)其巖石化學(xué)與稀土元素特征,經(jīng)原巖恢復(fù),東巖組為一套泥鈣質(zhì)沉積與少量基性-中酸性火山噴發(fā)的沉積旋回。①丁家山礦區(qū)目前揭露該組為2巖性段,為1組"淺-綠"變質(zhì)巖系旋回,且為東巖組的底部巖層;②峰巖礦區(qū)目前揭露該組為4巖性段,分為2組"淺-綠"變質(zhì)巖系旋回,尚未見底;且大致可與峰巖東礦區(qū)東巖組上部6、5、4、3段相對(duì)應(yīng);③峰巖東礦區(qū)目前揭露該組為6巖性段,分為3組"淺-綠"變質(zhì)巖系旋回,尚未見底。因此,研究認(rèn)為,丁家山礦區(qū)與峰巖礦區(qū)的賦礦變質(zhì)巖系并非同一層位,而是下伏于其下的含礦巖層,峰巖礦區(qū)深部具備尋找丁家山式鉛鋅礦床的前景。
[Abstract]:The Meixian Pb-Zn ore field was formed in the central Fujian continental rift environment, and the Pb-Zn orebody mainly occurred in the metamorphic rock series of the greenschist facies of the Maofanshan Group in the Neoproterozoic. The ore field is divided into two parts: Hexi (represented by Dingjiashan mining area) and Hedong (represented by Fengyan mine). There are obvious differences in lithology designation, stratigraphic division and orebody characteristics among different mining areas in the ore-bearing metamorphic rock series, which leads to the difficulty to contrast the strata between different mining areas. In this paper, based on the study of previous achievements, the sequence and geochemical characteristics of metamorphic rocks in Mamianshan Group are analyzed and studied. The strata of ore-bearing metamorphic rock series of lead and zinc deposits in Meixian area are divided and compared: the metamorphic rock series of Mafanshan Group of Neoproterozoic in Meixian Orefield is from old to new Longbei Xi formation. Dongyan formation. The lithology of Longbei Xi formation is mainly composed of quartz mica schist, feldspar quartz schist, marble, quartzite and other "light color schist" with a small amount of thin layer "green schist", according to its petrochemistry and rare earth element characteristics. Through the restoration of the original rocks, the Longbei Xi formation is a set of extremely thick marine siliceous, calciumite, semi-clayey and muddy sedimentary metamorphic rock series which lies in the Dongyan formation. There is a small scale basic-ultrabasic magma eruption in the gap. Only the Dingjiashan mining area in Meixian area has been exposed and has integrated contact with the overlying Dongyan formation. The results show that the host rock series of the Dingjiashan mining area is the bottom of the eastern rock formation, which is composed of several groups of "light color schist" and "green schist" lithologic cycle. The "light color schist" is mainly mica schist, and the feldspar verdite quartz schist is mainly composed of "light color schist" and "green schist". Marble, sodium granulite, etc.; The "greenschist" is a series of green minerals such as verdant, diopside, chlorite and actinolite, which is the main ore-bearing bed of the lead-zinc deposit in the ore field, according to its petrochemistry and REE characteristics. The Dongyan formation is composed of a set of mud-calcareous deposits and a few basic-intermediate-acid volcanic eruptions. 1. At present, it is revealed that the formation is a 2 lithologic member, which is a "shallow-green" metamorphic rock series cycle. And it is the bottom rock of Dongyan formation; (2) at present, the Fengyan mining area reveals that the formation is a 4 lithologic member, which is divided into 2 groups of "shallow-green" metamorphic rock series cycles, but has not yet been bottomed out; And it can be roughly corresponding to the upper part of the Dongyan formation of Fengyandong Mining area, section 6, 5, 5, 4, and 3. At present, it is revealed that the formation is 6 lithologic member, divided into 3 groups of "shallow-green" metamorphic rock series cycle, not yet bottom. Therefore, the study believes that. The ore-bearing metamorphic rock series of Dingjiashan and Fengyan mining areas are not the same horizon, but the ore-bearing strata underlying them. The deep part of Fengyan mining area has the prospect of finding Dingjiashan type lead-zinc deposit.
【學(xué)位授予單位】：南京大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.4

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