(1. 廣州海洋地質(zhì)調(diào)查局，廣州 510760；
2. 中國地質(zhì)大學(xué)(武漢) 地質(zhì)調(diào)查研究院，武漢 430074；
3. 中國地質(zhì)大學(xué)(武漢) 資源學(xué)院，武漢 430074)
摘 要: 灘間山金礦是位于我國柴達木北緣(柴北緣)中的典型的造山型金礦。本次工作利用激光剝蝕電感耦合等離子體質(zhì)譜(LA-ICP-MS)對灘間山金礦主要載金黃鐵礦進行微量元素分析；通過野外實地調(diào)查及室內(nèi)顯微鏡下觀察，將載金黃鐵礦分為四類: 蝕變炭質(zhì)糜棱片巖型黃鐵礦(Py1)、石英脈型浸染狀黃鐵礦(Py2)、石英脈型團塊狀黃鐵礦(Py3)、脈巖中浸染狀黃鐵礦(Py4)。結(jié)果表明，黃鐵礦Py1到Py4的微量元素特征指示其溫度逐漸升高，結(jié)合礦區(qū)內(nèi)同位素年代學(xué)資料，認為不同類型黃鐵礦對應(yīng)灘間山金礦成礦演化過程四階段中的后三階段：海西早期，構(gòu)造擠壓Au礦化富集階段(Py1)；海西晚期，構(gòu)造伸展階段Au礦化疊加富集階段(Py2，Py3)；印支期，柴達木-祁連地體地殼抬升Au礦化再富集階段(Py4)。
關(guān)鍵字: 灘間山；造山型金礦；黃鐵礦；微量元素；成礦演化
（1. Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou, 510760, China;
2. Institute of Geological Survey, China University of Geosciences, Wuhan 430074, China;
3. The Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China）
Abstract:The Tanjianshan gold deposit, locates in the northern Qaidam metallogenic belt, is a typical orogenic gold deposit. Laser-ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) analysis was conducted to determine the chemical composition of the bearing-gold pyrites in the Tanjianshan gold deposit. Four types of pyrites were recognized through detailed field work and microscopic studies. The first type of pyrites (Py1) is mainly present in altered carbonaceous mylonite schist. The second type of pyrites (Py2) occurs as veins or veinlets in the quartz. And the third type of pyrites (Py3) appears as mass in the quartz. The fourth type of pyrites (Py4) is mainly present in the vein rock, which is intruded into the mylonite schist. The results show that these pyrites indicate that the temperatures at which they formed increases from Py1 to Py4. According to the epochal characteristics of the Tanjianshan gold deposit, the four types of pyrites correspond to the later three stages in the metallogenic evolution of Tanjianshan gold deposit: Py1 was formed in tectonic extrusion environment during early Hercynian, Au began to enrich at the stage; Py2 and Py3 were produced in tectonic extension environment during later Hercynian, which Au occurs superpositione; Py4 was generated in crustal uplift of the Qaidam and Qilian block, Au occurs enrichment again.
Key words: Tanjianshan; orogenic gold deposit; pyrite; trace elements; metallogenic evolution
