(1. 中南大學(xué) 有色金屬成礦預(yù)測教育部重點實驗室 地球科學(xué)與信息物理學(xué)院，長沙 410083；
2. 湖南省地質(zhì)調(diào)查院，長沙 410116；
3. 青海省第三地質(zhì)礦產(chǎn)勘查院，西寧 810029)
摘 要: 虎頭崖礦床是祁漫塔格成礦帶中一個典型的鉛鋅多金屬礦床。依據(jù)野外礦床地質(zhì)調(diào)查和室內(nèi)光薄片鑒定工作將該礦床劃分為4個成礦期，7個成礦階段。16件具代表性硫化物礦石單礦物硫、鉛同位素測試顯示，硫、鉛同位素具有如下特征：δ(34S)變化范圍為+0.6×10-3~+9.8×10-3，平均值為+5.2×10-3，從巖體邊部至遠離巖體處硫同位素含量呈逐漸增大趨勢；鉛同位素變化范圍小，208Pb/204Pb為38.717~38.261，207Pb/204Pb為15.718~15.560，206Pb/204Pb為19.502~18.476。結(jié)合礦床地質(zhì)特征和前人研究成果，分析硫、鉛同位素特征，估算地幔、地殼中各組分，獲得地幔、地殼中Pb組分分別為0.07~0.22、0.78~0.93，并推斷礦床成礦物質(zhì)來源為以地殼成分為主、含地幔成分的巖漿巖。成礦物質(zhì)演化為在靠近巖體處S主要來源于巖體，遠離巖體處地層物質(zhì)含量逐漸增加，但主要為巖漿成分。
關(guān)鍵字: 虎頭崖多金屬礦床；硫；鉛；同位素；成礦物質(zhì)；地殼；地幔
（1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education, School of Geosciences and InfoPhysics, Central South University, Changsha 410083, China？
2. Hunan Institute of Geology Survey, Changsha 410116, China;
3. Third Institute of Qinghai Geological Mineral Prospecting, Xining 810029, China）
Abstract:Hutouya deposit is one of the typical Pb-Zn polymetallic deposits in Qimantage region. This deposit was divided into 4 metallogenic epoches and 7 mineralization stages based on geological characteristics of ore and identification of polished sections and thin slices. There were 16 representative minerals selected from sulfides and measured to determine the values of S and Pb isotopes. The results show that the values of δ(34S) range from +0.6×10-3 to +9.8×10-3, in which the average value is +5.2×10-3, and increase gradually from the edges of intrusions to the distal end of them, while the range of Pb isotope is small, with 38.717-38.261 for 208Pb/204Pb, 15.718-15.560 for 207Pb/204Pb, 19.502-18.476 for 206Pb/204Pb. Associated with characteristics of the ore deposit and the results of the former researchers, the characteristics of S and Pb isotopes were analyzed, and the proportions of Pb in the crust and mantle are estimated to be 0.07-0.22 and 0.78-0.93, respectively. The sources of metallogenic material are speculated from the magmatite that is composed of large ratio of crust matter and small proportion of mantle. The evolution of metallogenic material is that S element has higher proportion of igneous rocks’ matter when mineralization is adjacent to magmatite, and with larger percentage of strata in distal area; however, the main materials still originate from intrusions.
Key words: Hutouya polymetallic deposit; S; Pb; stable isotope; metallogenic material; crust; mantle
