發(fā)布時間：2019-02-28 17:02

【摘要】：富樂廠大型鉛鋅礦床位于我國西南川-滇-黔鉛鋅多金屬成礦區(qū)南段,礦體呈似層狀、透鏡狀賦存于中二疊統(tǒng)茅口組白云巖的層間破碎帶中;該礦床Pb+Zn金屬量大于100萬噸,Pb+Zn平均品位大于15.6%;礦石中富含Cd,Se,Ge,Ga多種分散元素,特別是該閃鋅礦中Cd的平均含量為16183ppm,是我國迄今發(fā)現(xiàn)含量最高的鉛鋅礦床之一。一個鉛鋅礦床同時伴生4種分散元素,且規(guī)模大,在世界鉛鋅礦床中也稱為罕見。本次工作系統(tǒng)研究了硫化物中常量元素、微量元素、穩(wěn)定同位素地球化學(xué)特征,主要取得以下成果和認(rèn)識:1.該礦床閃鋅礦中最大的特點是富含Cd元素,含量變化于0.347~2.19%之間,同時還含有少量Ge、As、Se、Sb等元素。在Fe-Zn含量變化圖上,二者顯示了較明顯的負(fù)相關(guān)關(guān)系,表明閃鋅礦中Fe可能主要替換Zn進入閃鋅礦的晶格;相比閃鋅礦,Cd在方鉛礦中含量明顯降低,說明Cd易于進入閃鋅礦晶格;砷黝銅礦主要產(chǎn)于鉛鋅礦石內(nèi),其中鋅含量普遍較高,據(jù)此特征將其定名為鋅砷黝銅礦。2.閃鋅礦中 Ga、In 平均含量為 Ga=2.23~684ppm;In=0.1~3.13ppm。對于同一件閃鋅礦樣品,淺色和深色閃鋅礦之間的微量元素含量并沒有明顯的變化。方鉛礦中微量元素含量普遍低于閃鋅礦,但元素Bi含量比閃鋅礦高一個數(shù)量級,顯示了在方鉛礦中富集的特征。3.在δ13C-δ18O上,所有數(shù)據(jù)均落在海相碳酸鹽巖附近,反映流體中的CO2為碳酸鹽巖的溶解作用。硫化物δ34S值主要集中于13‰~14‰。,據(jù)這此特征推測該礦床成礦流體中硫主要來自地層。區(qū)域結(jié)晶基底(昆陽群)和各時代沉積地層中碳酸鹽巖及峨眉山玄武巖鉛同位素組成投影到206Pb/~204Pb～~207Pb/~204Pb圖中進行比較,可以看到該礦床Pb同位素主要集中于昆陽群Pb同位素組成內(nèi),少量樣品落入峨眉山玄武巖或者蓋層碳酸鹽巖區(qū)域。說明該礦床成礦物質(zhì)主要來源于昆陽群,具有多源特征。綜合礦床地質(zhì)和地球化學(xué)特征,該礦床具有會澤型鉛鋅礦床的成因,為受構(gòu)造控制產(chǎn)于P_1m中上部蝕變白云巖中的塊狀鉛鋅礦床,因此,礦區(qū)東南段為主要找礦靶區(qū)。
[Abstract]:The large-scale lead-zinc deposit in the rich plant is located in the south section of the southwest Sichuan-Yunnan-Guizhou Pb-Zn-Pb-Pb-Pb-Pb-Pb-Pb-Pb-Pb-Pb-Pb-Pb-Pb-Pb-Pb-Zn-Pb-Pb-Zn-Pb-Pb-Zn-Pb-Pb-Zn deposit in the middle Permian Maokou Formation. The Pb + Zn metal content of this deposit is more than 1 million tons, and the average grade of Pb + Zn is more than 15.6%. The average content of Cd, Se, Ge and Ga in ore is 16183 ppm, which is one of the most found Pb-Zn deposits in China to date. A lead-zinc bed is also associated with 4 dispersed elements and has a large scale and is also known as a rare in the world lead-zinc deposit. The geochemical characteristics of constant elements, trace elements and stable isotopes in the sulfide are studied in this work system, and the following results and understandings are mainly obtained:1. The biggest characteristic of sphalerite in this deposit is that it is rich in Cd, the content of which is 0.347-2.19%, and contains a few elements such as Ge, As, Se, Sb and so on. Compared with the sphalerite, the content of the Cd in the galena is obviously reduced, and the Cd is easy to enter the sphalerite crystal lattice; The arsenic-bearing copper ore is mainly found in the lead-zinc ore, in which the content of zinc is generally higher, and its name is zinc arsenite. The average content of Ga and In in sphalerite is Ga = 2.23-684 ppm; In = 0.1-3.13 ppm. There was no significant change in the content of trace elements between the light and dark sphalerite for the same sphalerite sample. The content of trace elements in galena is generally lower than that of sphalerite, but the content of element Bi is an order of magnitude higher than that of sphalerite. On the 13C-1818O, all the data falls in the vicinity of the marine carbonate, which reflects the dissolution of the CO2 in the fluid. The S-value of sulfide is mainly in the range of 13 to 14%. According to this feature, it is assumed that the sulfur in the ore-forming fluid is mainly from the formation. The Pb-isotopic composition of the Pb-isotope in the regional crystal substrate (Kunyang group) and the carbonate and Emeishan basalt lead-isotopic compositions in the sedimentary strata of the time is compared with that of 206Pb/ ~ 204Pb ~-207Pb/ ~ 204Pb. The Pb isotope of the deposit is mainly concentrated in the Pb isotope composition of the Quyang Group. A small amount of the sample falls into the carbonate region of the Emeishan basalt or caprock. It is indicated that the ore-forming minerals are mainly from the Kunyang group and have multi-source characteristics. The geological and geochemical characteristics of the comprehensive deposit, which have the origin of the Huize Pb-Zn deposit, are the massive lead-zinc deposit in the upper altered dolomite in the P _ 1 m, so that the southeast section of the mining area is the main prospecting target area.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.4

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