本文選題：南秦嶺 + 旬陽盆地��； 參考：《地質(zhì)學(xué)報(bào)》2017年02期

【摘要】：南秦嶺旬陽盆地的鈉長巖此前被認(rèn)為是熱水沉積或熱液交代作用的產(chǎn)物。本文對南秦嶺旬陽盆地東端黃石板地區(qū)侵入于下志留統(tǒng)梅子亞組淺變質(zhì)巖中的鈉長巖體進(jìn)行了地球化學(xué)和鋯石U-Pb LA-ICP-MS年代學(xué)研究,結(jié)果表明鈉長巖具有富鈉貧鉀、鋁不飽和、虧損大離子親石元素K和Rb、高場強(qiáng)元素(Nb、Ta、Th、Hf)顯著富集的地球化學(xué)特點(diǎn),主體屬于鈣堿性系列巖石,反映幔源成因的特征。鈉長巖中獲得最年輕的鋯石U-Pb年齡為364~376Ma,該年齡代表巖體的形成年齡,反映晚泥盆世時(shí)南秦嶺旬陽盆地處于強(qiáng)烈的伸展構(gòu)造環(huán)境。此項(xiàng)研究結(jié)果表明,在旬陽盆地的志留系中,巖漿成因與熱水沉積成因的鈉長巖可能是共存的。黃石板巖漿成因鈉長巖巖體中含有大量前寒武紀(jì)和早古生代的捕獲鋯石,在捕獲鋯石中測得迄今為止在研究區(qū)及其鄰區(qū)獲得的最古老的鋯石U-Pb年齡(3291Ma)。這些捕獲鋯石的測年數(shù)據(jù)說明,研究區(qū)所在的南秦嶺地區(qū)可能從古太古代開始就與揚(yáng)子地塊具有明顯的親緣性。
[Abstract]:The sodium feldspar in Xunyang Basin of the South Qinling Mountains was previously considered to be the product of hydrothermal deposition or hydrothermal metasomatism. In this paper, geochemistry and zircon U-Pb LA-ICP-MS chronology of the sodium feldspar intruded into the shallow metamorphic rocks of the Lower Silurian Meiziya formation in the eastern end of Xunyang Basin, South Qinling are studied. The results show that the sodium feldspar is rich in sodium and poor in potassium and is not saturated in aluminum. Large ion lithophile elements K and Rb, and high field strength elements NbTa-Th Hf) are characterized by their significant enrichment in geochemistry and belong to the calc-alkaline series rocks, which reflect the characteristics of mantle origin. The youngest zircon U-Pb age obtained from the sodium feldspar is 36440? 376Ma. this age represents the age of the formation of the rock mass, which indicates that the Xunyang basin in the southern Qinling Mountains was in a strong extensional tectonic environment during the late Devonian. The results show that magmatic and hydrothermal sedimentary sodium feldspar may coexist in Silurian system of Xunyang basin. A large amount of Precambrian and early Paleozoic caught zircons were found in the Huangshi plate magmatic sodium feldspar, and the oldest zircon U-Pb dating obtained in the studied area and its adjacent area has been obtained by now. These zircon dating data suggest that the southern Qinling area in which the study area is located may have been closely related to the Yangtze block since PaleoArchean.
【作者單位】： 大陸動力學(xué)國家重點(diǎn)實(shí)驗(yàn)室(西北大學(xué))西北大學(xué)地質(zhì)學(xué)系;白河縣大灣銀礦有限責(zé)任公司;
【基金】：陜西省自然科學(xué)基金項(xiàng)目(編號2014JM5206)資助成果
【分類號】：P588.3;P534.44

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