本文選題：岐山巖體 + 加里東運(yùn)動(dòng)�。� 參考：《地質(zhì)學(xué)報(bào)》2017年04期

【摘要】：武夷山地區(qū)加里東期深熔混合巖化-巖漿作用普遍,且兩者時(shí)代一致或相近,但是加里東期深熔作用的啟動(dòng)時(shí)間尚不明確。贛南尋烏縣岐山巖體位于武夷山構(gòu)造帶南部,該巖體形成時(shí)代缺乏精確的年代學(xué)依據(jù)�；阡喪疞A-ICP-MS U-Pb測年手段,在該巖體中發(fā)現(xiàn)兩期鋯石,早期鋯石為深熔成因,晚期為巖漿成因。本次研究獲得的晚期鋯石形成時(shí)代為445~440Ma,具有從外向內(nèi)年齡漸新的規(guī)律,表明該巖體形成于晚奧陶世晚期-早志留世,可能是從源區(qū)上升的不同批次巖漿就位的結(jié)果,即該巖體為加里東期深熔-幕式、多期次巖漿活動(dòng)的結(jié)果。邊緣部位與巖體中心部位分別獲得早期深熔鋯石加權(quán)平均年齡值(458±4Ma)與巖漿鋯石加權(quán)平均年齡值(460±4Ma),兩者在誤差范圍內(nèi)一致。表明武夷山地區(qū)在加里東早期,大約460Ma左右發(fā)生了一期深熔-巖漿活動(dòng),為武夷山構(gòu)造帶加里東運(yùn)動(dòng)深熔作用的啟動(dòng)時(shí)代提供了制約。
[Abstract]:The Caledonian melting-magmatism is common in Wuyishan area, and the two ages are the same or similar, but the starting time of Caledonian deep melting is not clear. The Qishan rock body in Xunwu County is located in the south of Wuyishan structural belt. Based on the zircon LA-ICP-MS U-Pb dating method, two phases of zircon have been found in the body. The early zircon is of deep melting origin and the late stage is magmatic origin. The late zircon age obtained in this study is 445,440Ma. it has a new age from outer to inner, which indicates that the body was formed in late Ordovician and early Silurian, which may be the result of different batches of magma rising from the source area. It is the result of the Caledonian deep-melt-curtain-type and multi-stage magmatism. The weighted mean age of early melting-zircon (458 鹵4MaA) and magmatic zircon (460 鹵4MaA) were obtained at the edge and the center of the rock body, respectively, which are consistent with each other in the error range. It is suggested that a period of deep melt magmatic activity occurred around 460Ma in the early period of Caledonian movement in Wuyishan area, which restricted the initiation of the Caledonian movement in the Wuyishan tectonic belt.
【作者單位】： 中國地質(zhì)科學(xué)院礦產(chǎn)資源研究所;江西省地質(zhì)調(diào)查研究院;
【基金】：中國地質(zhì)調(diào)查局地質(zhì)調(diào)查項(xiàng)目(編號(hào):12120113071600)資助的成果
【分類號(hào)】：P597.3;P588.11

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