本文選題：東烏珠穆沁旗 + 塔爾巴格特組　； 參考：《巖石礦物學(xué)雜志》2017年02期

【摘要】：內(nèi)蒙古東烏珠穆沁旗地區(qū)是中國北方造山帶內(nèi)泥盆系最為發(fā)育地區(qū)之一。前人運(yùn)用古生物化石確定了該區(qū)泥盆紀(jì)地層的相對(duì)年代,但缺少精確的同位素年齡。本文采用LA-ICP-MS測(cè)年技術(shù),對(duì)發(fā)育在泥盆紀(jì)塔爾巴格特組上部的凝灰?guī)r夾層進(jìn)行了鋯石U-Pb同位素測(cè)年,獲得~(206)Pb/~(238)U加權(quán)平均年齡為380.8±1.6 Ma(MSWD=2.7),確定其時(shí)代為晚泥盆世早期,為本區(qū)泥盆系提供了精確的年代學(xué)數(shù)據(jù)。結(jié)合古生物化石組合資料,將塔爾巴格特組時(shí)代確定為中泥盆世吉維特期—晚泥盆世弗拉期。
[Abstract]:East Wuzhhumuqin Banner area of Inner Mongolia is one of the most developed areas of Devonian system in the northern orogenic belt of China. Paleontological fossils have been used to determine the relative age of Devonian strata in this area, but the exact isotopic age is lacking. The zircon U-Pb isotopic dating of tuff intercalations developed in the upper part of the Devonian Talal Baggett formation has been carried out by using LA-ICP-MS dating technique. The weighted mean age of 380.8 鹵1.6mMSWD2.7U has been obtained from the zircon dating of the tuff intercalations in the upper part of the Devonian Tal Baggett formation. The age is determined to be the early stage of the late Devonian. It provides accurate chronological data for Devonian system in this area. According to the data of fossil assemblage, the Baggett formation is determined to be the Middle Devonian Givette to the late Devonian Fla.
【作者單位】： 中國地質(zhì)調(diào)查局天津地質(zhì)調(diào)查中心;
【基金】：中國地質(zhì)調(diào)查項(xiàng)目(1212011220446,121201006000150013)~~
【分類號(hào)】：P588.2;P597.3

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本文編號(hào)：1902696