(1. 中南大學(xué) 有色金屬成礦預(yù)測教育部重點(diǎn)實(shí)驗(yàn)室，長沙 410083；
2. 中南大學(xué) 地球科學(xué)與信息物理學(xué)院，長沙 410083)
摘 要: 利用電子探針(EPMA)對安徽銅陵新橋銅硫鐵礦床的膠狀黃鐵礦進(jìn)行原位微區(qū)主、微量元素成分分析，研究結(jié)果表明：膠狀黃鐵礦的w(Fe)/w(S)為0.803~1.058、w(Co)/w(Ni)為0.571~79.000、w(S)/w(Se)為1 650.656~ 8 711.600、w(Zn)/[w(Zn)+w(Pb)]為0.027~0.460，膠狀黃鐵礦為熱液成因，其形成溫度高于結(jié)晶黃鐵礦的形成溫度；在膠狀黃鐵礦內(nèi)部，元素Fe和S含量穩(wěn)定，Cu和Pb在核部較為富集。在此基礎(chǔ)上，對新橋礦區(qū)的黃鐵礦進(jìn)行主微量元素相關(guān)性分析，得出膠狀黃鐵礦中As可能以固溶體的形式出現(xiàn)，且早期成礦流體中As含量較為穩(wěn)定，但后期成礦流體中As含量卻逐步提高。
關(guān)鍵字: 新橋；膠狀黃鐵礦；主量元素；微量元素
（1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education,
Central South University, Changsha 410083, China;
2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China）
Abstract:The contents of major and trace elements of colloidal pyrite in Xinqiao, Tongling, Anhui Province, China, were measured by EPMA. The analysis data suggest that w(Fe)/w(S), w(Co)/w(Ni), w(S)/w(Se) and w(Zn)/[w(Zn)+w(Pb)] of colloidal pyrite is from 0.803 to 1.058, 0.57 to 79.000, 1 650.656 to 8 711.600 and 0.027 to 0.460, respectively, which indicates that the colloidal pyrite forms because of hydrotherm, its forming temperature is higher than that of the crystal pyrite, the contents of Fe and S are consistent, and Cu and Pb enrich in the center of colloidal pyrite. On this basis, correlation analysis of major and trace elements of pyrites was carried out, and the results show that As in the colloidal pyrite might be in the from of solid solution, and the content of As in the early metallogenic hydrotherm is consistent , while the one in the late metallogenic hydrotherm increases step by step.
Key words: Xinqiao; colloidal pyrites; major element; trace element
