【摘要】：針對扎蘭屯地區(qū)中生代早白堊世火山巖的巖石學、地層學、巖相學及年代學等方面存在的問題,在扎蘭屯地區(qū)實施了火山巖“地層.巖相”雙重劃分的方法,并對火山巖年齡、典型火山機構詳細的解譯與分析、早白堊世火山巖地球化學等分析和測定。通過野外和室內(nèi)的大量研究,將扎蘭屯地區(qū)早白堊世火山巖地層劃分為白音高老組、梅勒圖組。白音高老組火山巖以一套年齡在129.3Ma±,巖性為中酸性-酸性的巖石組合,包括流紋巖、石泡流紋巖等；梅勒圖組火山巖以一套年齡在120.7Ma±,巖性以中基性-中性為主的巖石組合。按照火山巖“地層-巖相”雙層填圖的思想理念,將扎蘭屯地區(qū)白音高老組火山巖劃分為3個巖相；梅勒圖組火山巖劃分為5個巖相。主要以溢流相、爆發(fā)相和噴溢相為主。扎蘭屯地區(qū)火山巖主要以中、酸性火山巖為主,w(SiO_2)%=55.63-74.40,且以亞堿性巖石為主,w(K_2O)%=1.46-5.77,平均=4.05,w(K_2O+Na_2O)%=5.41-9.95,平均=7.8。富集大離子親石元素(LILE),δEu=0.05-0.96,平均=0.596,δCe=0.88-1.02,平均=1.029。相對虧損高場強元素(HFSE)綜合分析扎蘭屯地區(qū)火山巖特點并結合他人的研究成果,初步認為內(nèi)蒙古東部中生代火山巖形成于古亞洲洋與蒙古-鄂霍次克洋俯沖閉合有關的雙重作用,在整個作用過程中以殼�；烊咀饔煤徒Y晶分異作用為主,可能有平衡分異作用的參與。
[Abstract]:In view of the problems existing in petrology, stratigraphy, petrography and chronology of the Mesozoic early Cretaceous volcanic rocks in the Zalantun area, the volcanic "strata" have been implemented in the area. The method of "double division of lithofacies", and the detailed interpretation and analysis of volcanic age, typical volcanic mechanism and geochemistry of volcanic rocks in early Cretaceous, etc. The volcanic strata of early Cretaceous in Zalantun area are divided into the old group and the Mailetu formation through a lot of field and laboratory studies. The volcanic rocks of the Baiyingao formation are composed of intermediate acidic and acidic rock assemblages of age at 129.3Ma 鹵, including rhyolite, etc. The Melertu volcanic rocks are a set of rock assemblages of 120.7Ma 鹵, with meso-basic-neutral lithology. According to the idea of double layer mapping of volcanic rocks, the volcanic rocks of Baiyingao formation in Zarantun area are divided into three lithofacies, and volcanic rocks of Mailetu formation are divided into five lithofacies. Main overflow phase, explosive phase and spillage phase. The main volcanic rocks in Zalantun area are intermediate, acidic volcanic rocks (, w (SiO_2)% = 55.63-74.40, and subalkaline rocks dominated by, w (K2O% = 1.46-5.77, with an average of 4.05. W (K2O Na_2O)% = 5.41-9.95, average = 7.8. The average value of (LILE), 未 Eu=0.05-0.96, and 未 Ce=0.88-1.02, are 0.596 and 1.029 respectively. The characteristics of volcanic rocks in Zalantun area are comprehensively analyzed by (HFSE), which is a relatively depleted high field strength element, and combined with the research results of others. It is preliminarily considered that the Mesozoic volcanic rocks in the eastern part of Inner Mongolia were formed in the Paleo-Asian Ocean and related to the subduction closure of the Mongolia-Okhotsk Ocean, and the crust-mantle mixing and crystallization differentiation were dominant in the whole process. There may be balanced differentiation involved.
【學位授予單位】：遼寧工程技術大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P588.14

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