【摘要】：福建平和大小礬山—包圍山地區(qū)位于閩東沿海陸相火山盆地植被覆蓋區(qū),與紫金山礦田同處于上杭—云霄NW向銅、金、鉬多金屬成礦帶上,是尋找“紫金山式”銅、金多金屬礦的重要找礦靶區(qū)。但是該地區(qū)植被覆蓋嚴(yán)重,以往勘查研究程度相對(duì)較低,雖然該區(qū)礦產(chǎn)資源豐富,且具有較大的“紫金山式”銅、金多金屬礦床找礦潛力,但與該礦床相關(guān)的典型礦床成礦要素的研究還是空白,目前不但尚未建立起統(tǒng)一的基于陸相火山盆地植被覆蓋環(huán)境下勘查理論找礦方法,而且該區(qū)找礦方向尚未明確。因此,結(jié)合已有研究成果,本文選重點(diǎn)取平和大小礬山—包圍山地區(qū)開(kāi)展成礦要素綜合研究及成礦預(yù)測(cè)工作,并指明該區(qū)找礦方向。典型礦床研究表明,包圍山花崗斑巖與容礦圍巖—石帽山群地層底部凝灰熔巖鋯石LA-ICP-MS U-Pb年齡分別為(98.1±1.1)Ma和(104.6±1.1)Ma;通過(guò)對(duì)包圍山鉬多金屬礦體中輝鉬礦的Re-Os同位素分析,獲得其模式年齡為(95.2±1.5)Ma,為本區(qū)首次獲得的精確成礦年齡。輝鉬礦中Re的含量指示鉬礦成礦作用與巖漿殼幔混合作用有關(guān)。大小礬山地區(qū)與紫金山銅金礦田具有相似的區(qū)域成礦地質(zhì)背景,控礦構(gòu)造、巖漿巖及巖相蝕變等主要成礦要素特征也類(lèi)似,而火山機(jī)構(gòu)中心部位發(fā)育的石英-明礬石化帶和低溫硅化帶是該地區(qū)尋找“紫金山式”銅、金多金屬礦床的重要標(biāo)志。結(jié)合已有研究成果,本文認(rèn)為大小礬山成礦預(yù)測(cè)區(qū)具有尋找淺成中低溫?zé)嵋盒虲u、Pb、Zn礦、斑巖型Cu、Au多金屬礦及火山(-次火山)熱液型Ag、Pb、Zn礦的潛力,包圍山成礦預(yù)測(cè)區(qū)老巖山—三斗坑—大峰山一帶尋找斑巖型Mo多金屬礦、火山(-次火山)熱液型Ag、Pb、Zn礦的理想地段;小芹山成礦預(yù)測(cè)區(qū)是尋找淺成中低溫?zé)嵋盒虵e、Au多金屬礦的有利地段。NW向、NE向、環(huán)形火山斷裂及多組斷裂交匯部位所發(fā)育的的構(gòu)造裂隙帶是本區(qū)成礦的有利部位,物探及化探異常、圍巖蝕變、金屬礦化等主要沿NW向及NE向斷裂分布,其中NW向裂隙構(gòu)造帶是成礦預(yù)測(cè)區(qū)最重要的導(dǎo)礦和儲(chǔ)礦構(gòu)造。
[Abstract]:The alanshan-bengshan area in Pingping, Fujian Province, is located in the vegetation cover area of the continental volcanic basin along the eastern Fujian coast, and is located in the copper, gold and molybdenum polymetallic metallogenic belt of Shanghang Yunxiao NW with the Zijinshan ore field. It is to look for "Zijinshan type" copper. The important prospecting target area of gold polymetallic ore. However, the vegetation cover in this area is serious, and the degree of exploration and research in the past is relatively low. Although the area is rich in mineral resources and has great prospecting potential of Zijinshan type copper and gold polymetallic deposits, However, there is still no research on the metallogenic elements of typical deposits related to the deposit. Not only has a unified prospecting method based on the vegetation coverage environment of continental volcanic basins not been established, but the prospecting direction in this area has not been clear. Therefore, combined with the existing research results, this paper focuses on the comprehensive study of metallogenic elements and metallogenic prediction in the Panshan-Baishan area, and points out the direction of prospecting in this area. The typical ore deposits show that the zircon LA-ICP-MS U-Pb age of tuffite at the bottom of the bailing granitic porphyry and the ore-bearing surrounding rock-Shimaoshan group is (98.1 鹵1.1) Ma and (104.6 鹵1.1) Ma.The Re-Os isotopic analysis of the molybdenum ore in the bengshan molybdenum polymetallic ore body is carried out. The model age is (95.2 鹵1.5) Ma, which is the first accurate metallogenic age in this area. The content of re in molybdenum indicates that the mineralization of molybdenum ore is related to the mixing of magmatic crust and mantle. There are similar regional metallogenic geological background, ore-controlling structure, magmatic rock and lithofacies alteration and other main metallogenic elements in the area and Zijinshan copper-gold deposit field, and the characteristics of the main metallogenic elements are similar to those of the Zijinshan copper-gold field. The quartz alum petrochemical zone and the low temperature silicification zone developed in the central part of the volcanic mechanism are the important signs for searching for the Zijinshan type copper and gold polymetallic deposits in this area. Combined with the existing research results, it is considered in this paper that the large and small Fanshan metallogenic prediction area has the potential to search for the epigenetic low temperature hydrothermal Cu PbPbZn ore, the porphyry type Cu Pb au polymetallic ore and the volcanic (- subvolcanic) hydrothermal AgPbPbPnzn deposit. In the area of Laoyanshan-Sandoukeng-Dafengshan metallogenic prediction area, an ideal area for porphyry Mo polymetallic deposits and volcanic (-subvolcanic) hydrothermal AgPbPb-Zn deposits; The ore-forming prediction area of Xiaoqinshan is a favorable area. NW trending NE direction is the favorable area for finding the epithermal hydrothermal type Feo au polymetallic ore deposit. The tectonic fissure zone developed at the intersection of ring volcanic faults and multi-group faults is the favorable place for metallogenic formation in this area. Geophysical and geochemical anomalies, wall rock alteration and metal mineralization are mainly distributed along the NW and NE trending faults, among which the NW fracture structural zone is the most important ore-conducting and ore-reserving structure in the metallogenic prediction area.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：P618.2

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