本文選題：SHRIMP測(cè)年 + 巖石地球化學(xué)�。� 參考：《地球?qū)W報(bào)》2017年05期

【摘要】：多龍是西藏班—怒成礦帶中最大的斑巖Cu(Au)礦集區(qū),其區(qū)域動(dòng)力學(xué)演化歷史一直是研究的熱點(diǎn)。礦集區(qū)內(nèi)尕爾勤地區(qū)侏羅系海相沉積地層中發(fā)現(xiàn)了枕狀玄武巖塊,對(duì)其成巖時(shí)代和巖石地球化學(xué)的研究,將有助于了解班公湖—怒江洋盆的演化歷史。巖石地球化學(xué)分析顯示,枕狀玄武巖稀土元素總量較低(∑REE為38.01×10~( 6)~63.56×10~( 6)),輕重稀土分異不明顯,標(biāo)準(zhǔn)化配分曲線屬于平坦型,表現(xiàn)出E-MORB的特征。離子探針?lè)治?SHRIMP)獲得其鋯石U-Pb年齡為(298±11)Ma,與區(qū)域晚石炭—早二疊地層中基性巖脈和玄武巖時(shí)代一致,可能是早二疊世班怒洋初始裂解時(shí)期大規(guī)模火山活動(dòng)的產(chǎn)物。
[Abstract]:Dulong is the largest porphyry Cu (Au) ore concentration in the Ban-Nu metallogenic belt in Tibet, and its regional dynamic evolution history has been a hot research topic. Pillow basalt blocks have been found in Jurassic marine sedimentary strata in the Galerqin area. The study of their diagenetic ages and geochemistry will be helpful to understand the evolution history of Bangong Lake-Nujiang ocean basin. The petrogeochemical analysis shows that the REE content of pillow basalts is relatively low (鈭，

本文編號(hào)：2093229