本文選題：核桃壩 + 流紋斑巖�。� 參考：《現(xiàn)代地質(zhì)》2017年02期

【摘要】：內(nèi)蒙古核桃壩地區(qū)流紋斑巖體與該區(qū)鈾成礦有著密切關(guān)系,為了尋求找礦突破,通過(guò)地球化學(xué)和巖漿與構(gòu)造演化等方法,著重討論流紋斑巖和構(gòu)造與鈾富集的關(guān)系。該流紋斑巖體位于多倫火山盆地榛子山破火山口南部,巖石富硅(w(SiO_2)=70.15%~78.58%),富堿(w(Na_2O+K_2O)=7.49%~10.82%),屬鉀質(zhì)(w(K_2O)=5.28%~9.30%);A/CNK的值在0.84~1.28之間,在火山巖TAS分類圖解中全部樣品均落入亞堿性流紋巖范圍內(nèi),屬于亞堿性系列流紋巖類;稀土總量高(∑REE=254.47×10~(-6)~499.99×10~(-6)),其中輕稀土元素富集,重稀土元素虧損,輕重稀土分餾程度強(qiáng);親石元素Rb、Th相對(duì)富集,特別是U含量(6.66×10~(-6)~966.00×10~(-6))異常富集,部分?jǐn)?shù)據(jù)極高,而Sr和Eu明顯虧損。巖石巖漿物質(zhì)來(lái)源于下地殼的部分熔融,侵位于后碰撞構(gòu)造環(huán)境,屬于A2型花崗巖類型。伸展構(gòu)造背景下的富鈾流紋斑巖侵位、后期促進(jìn)鈾運(yùn)移富集的成礦構(gòu)造及富鈾熱液隨構(gòu)造上移并進(jìn)一步萃取等多種事件共同作用,最終促成了核桃壩鈾礦床的形成。
[Abstract]:The fluid porphyry body in Juuba area, Inner Mongolia is closely related to uranium mineralization in this area. In order to seek a breakthrough in prospecting, the relationship between flow porphyry and tectonics and uranium enrichment is discussed through geochemical and magmatic and tectonic evolution methods. It is located in the south of hazelzishan crater in Dolon volcanic basin. The rock is rich in (w (SiO2) 70.15% (78.58%), alkali-rich (w (Na2O K2O) 7.490.82%), belongs to potassium (w (K2O) 5.280.30%). In the taxonomic map of volcanic rocks, all the samples fall into the range of subalkaline rhyolite. It belongs to the subalkaline series rhyolite, the total amount of rare earth (鈭，

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