本文選題：SHRIMP鋯石U-Pb年代學(xué) + Sr-Nd-Pb同位素��； 參考：《地質(zhì)學(xué)報(bào)》2017年09期

【摘要】：東窩東銅多金屬礦床位于羌塘地體南緣,班公湖-怒江成礦帶西段,多龍銅金礦集區(qū)東側(cè),是新發(fā)現(xiàn)的重要找礦前景區(qū)。為進(jìn)一步確定礦區(qū)成礦地質(zhì)條件及找礦潛力,通過對礦區(qū)詳細(xì)的地質(zhì)調(diào)查和鉆孔編錄,運(yùn)用離子探針(SHRIMP)對含礦斑巖進(jìn)行鋯石年代學(xué)研究,并利用等離子質(zhì)譜儀(ICP-MS)對其進(jìn)行地球化學(xué)和SrNd-Pb同位素分析。結(jié)果顯示,東窩東礦區(qū)含礦斑巖結(jié)晶時(shí)代為122 Ma,是區(qū)域早白堊世成礦事件的產(chǎn)物,Sr-NdPb同位素組成(Sr初始值為0.7052~0.7062,143 Nd/144 Nd比值為0.512365~0.512409,εNd(t)值為-4.05~-3.88;~(206)Pb/~(204)Pb、~(207)Pb/~(204)Pb、~(208)Pb/~(204)Pb分別為18.691~18.823、15.638~115.796、38.649~38.924,揭示含礦斑巖巖漿源區(qū)有明顯的殼�；旌�,可能為來源于班怒洋俯沖環(huán)境下的新生下地殼。為科學(xué)判定礦區(qū)成礦潛力,解決礦區(qū)找礦瓶頸問題,綜合分析礦區(qū)地質(zhì)、物探(1/1萬磁法和激電中梯測量)和化探(1/1萬水系沉積物測量)成果后認(rèn)為,東窩東礦區(qū)有良好的成礦地質(zhì)條件,物、化探異常分布集中,疊合較好,存在重要找礦潛力,建議以斑巖-淺成低溫?zé)嵋盒豌~多金屬礦床為勘查找礦方向。
[Abstract]:The Dongwodong copper polymetallic deposit is located in the southern margin of Qiangtang terrane, the western section of Bangong Lake-Nujiang metallogenic belt, and the east side of Duolong copper and gold deposit concentration area. In order to further determine the ore-forming geological conditions and ore-prospecting potential, the zircon chronology of ore-bearing porphyry is studied by using ion probe shrimp through detailed geological investigation and borehole cataloging in the ore area. The geochemistry and SrNd-Pb isotope analysis were performed by plasma mass spectrometer (ICP-MS). The results show that 涓滅獫涓滅熆鍖哄惈鐭挎枒宀╃粨鏅舵椂浠ｄ負(fù)122 Ma,鏄尯鍩熸棭鐧藉灘涓栨垚鐭夸簨浠剁殑浜х墿,Sr-NdPb鍚屼綅绱犵粍鎴，

本文編號：1958653