本文選題：地質(zhì)特征　切入點(diǎn)：地球化學(xué)特征　出處：《金屬礦山》2016年01期 　論文類型：期刊論文

【摘要】：北衙金多金屬礦床地處金沙江—紅河富堿斑巖帶南段,是該帶上成礦作用與富堿斑巖有關(guān)礦床的代表。通過(guò)對(duì)北衙金礦外圍似層狀Pb-Zn-Ag礦床地質(zhì)特征及地球化學(xué)特征進(jìn)行研究,得出了以下結(jié)論:1賦礦圍巖為三疊系中統(tǒng)北衙組灰?guī)r,相對(duì)富集Pb、Zn、Au、Ag等成礦元素,是鉛鋅銀礦的有利礦源層;2成礦流體為NaCl-H_2_O-CO_2體系,具有中—低溫、中—低鹽度的特征,來(lái)源于富堿斑巖體結(jié)晶分異的巖漿熱液;3礦石S同位素含量-2.4‰~+2.8‰,指示礦床硫與斑巖體有相同的來(lái)源,均來(lái)自深部地幔,后期有部分地層硫的加入,礦石Pb同位素分析結(jié)果指示成礦物質(zhì)來(lái)源于殼�；旌�;4特定的北衙組碳酸鹽巖地層條件、北衙—芹河NNW向向斜構(gòu)造及斑巖的巖漿活動(dòng),構(gòu)成了北衙金礦外帶似層狀Pb-Zn-Ag多金屬礦床的主要控礦因素。綜合該礦床地質(zhì)特征、地球化學(xué)特征、控礦因素,對(duì)礦床成因進(jìn)行了探討,認(rèn)為北衙金礦外帶似層狀Pb-Zn-Ag多金屬礦床是富堿斑巖分異熱液成礦作用的結(jié)果,是北衙富堿斑巖金多金屬成礦系統(tǒng)外帶的產(chǎn)物。
[Abstract]:The Beiya gold polymetallic deposit is located in the southern section of Jinshajiang-Honghe alkali rich porphyry belt, and is the representative of mineralization and alkali-rich porphyry related deposits in this belt. The geological and geochemical characteristics of layered Pb-Zn-Ag deposits in the periphery of Beiya gold deposit are studied. The following conclusions are drawn that the surrounding rock of the No. 1 ore-bearing system is the limestone of the Beiya formation of the Middle Triassic system, which is relatively rich in the ore-forming elements such as Pb, Zn, Zn, au, Ag and so on. It is a favorable ore-forming fluid of the lead-zinc-silver deposit, which is a NaCl-H_2_O-CO_2 system with the characteristics of medium-low temperature and medium-low salinity. The S isotopic content of magmatic hydrothermal Qiu 3 ore derived from the crystallization differentiation of alkali-rich porphyry is -2.4 鈥，

本文編號(hào)：1570016