本文選題：白山組 + 巖石組合��； 參考：《長安大學(xué)》2015年碩士論文

【摘要】：內(nèi)蒙古自治區(qū)額濟(jì)納旗拐子湖一帶位于我國的西北部,屬于我國的北山地區(qū),是我國重要的成礦遠(yuǎn)景區(qū)�；鹕綆r的基礎(chǔ)性研究對于地質(zhì)找礦和地質(zhì)演化具有重要的研究意義。內(nèi)蒙古拐子湖一帶中北部廣泛分布著石炭紀(jì)白山組火山巖。開展白山組火山巖的研究對于了解該地區(qū)的晚古生代的巖漿演化過程有重要意義,也為晚古生代的火山巖的成礦背景提供基礎(chǔ)資料。本文以研究區(qū)石炭紀(jì)白山組火山巖為研究對象,通過巖石學(xué)、地球化學(xué)等方面的系統(tǒng)研究,總結(jié)了白山組的巖石組合、地層層序及變化規(guī)律,判斷了火山巖的巖石成因和大地構(gòu)造背景。通過研究取得了以下認(rèn)識:(1)研究區(qū)石炭紀(jì)白山組火山巖在石炭紀(jì)綠條山組之上,呈整合接觸關(guān)系,與第四系砂礫灘呈壓蓋接觸關(guān)系。(2)研究區(qū)白山組火山巖主要由安山巖、英安巖、流紋巖和中酸性碎屑巖組成。(3)研究區(qū)白山組火山巖屬于鈣堿性系列,普遍具有富鈉富鉀、堿金屬含量高、富鋁低鈦、安第斯型弧的特征。(4)研究區(qū)白山組火山巖樣品稀土元素球粒隕石標(biāo)準(zhǔn)化配分圖顯示弱的右傾型。樣品顯示輕稀土相對富集,重稀土相對虧損,輕重稀土均有不同程度的分餾。稀土總量含量高,巖石樣品具有弱的Eu負(fù)異常,樣品在巖漿的演化過程中存在斜長石的分離結(jié)晶作用的存在。研究區(qū)火山巖微量元素原始地幔蛛網(wǎng)圖明顯右傾傾曲線,大離子親石元素Rb、Ba、U、Pb富集、高場強(qiáng)元素Nb、Ta、Ti相對虧損的特點(5)研究區(qū)白山火山巖的巖漿源區(qū)并非原始地幔,巖漿源區(qū)可能是經(jīng)過俯沖帶流體改造后的富集地幔楔。(6)研究區(qū)白山組火山巖為安第斯型大陸邊緣弧的構(gòu)造環(huán)境,形成于消減俯沖帶,具大陸邊緣弧構(gòu)造環(huán)境的特征。
[Abstract]:Guizi Lake, Ejina Banner of Inner Mongolia Autonomous region, is located in the northwest of China and belongs to the Beishan area of China, which is an important metallogenic area in China. The basic study of volcanic rocks is of great significance for geological prospecting and geological evolution. Volcanic rocks of Baishan formation of Carboniferous are widely distributed in the central and northern part of Guizi Lake, Inner Mongolia. The study of volcanic rocks of Baishan formation is of great significance for understanding the magmatic evolution of the late Paleozoic in this area, and also provides basic data for the metallogenic background of the late Paleozoic volcanic rocks. Taking the volcanic rocks of the Baishan formation of Carboniferous in the study area as the research object, the rock assemblage, stratigraphic sequence and variation law of the Baishan formation are summarized through systematic study of petrology and geochemistry. The petrogenesis and tectonic setting of volcanic rocks are judged. Through the study, we have obtained the following understanding: the volcanic rocks of the Baishan formation of the Carboniferous in the study area are in an integrated contact relationship over the Lutiaoshan formation of the Carboniferous, and the volcanic rocks of the Baishan formation in the study area are mainly composed of andesite. The volcanic rocks of Baishan formation in the study area belong to calc-alkaline series, which are generally rich in sodium and potassium, high in alkali metal content, rich in aluminum and low in titanium. The characteristics of Andes arc. 4) the normalized distribution of rare earth element chondrites in volcanic samples of Baishan formation shows a weak right-dip type. The sample shows that the light rare earth is relatively enriched, the heavy rare earth is relatively deficient, and the light and heavy rare earth is fractionated to varying degrees. The total amount of rare earth is high, the rock samples have weak EU negative anomalies, and the samples have the separation and crystallization of plagioclase during the evolution of magma. The trace element cobweb of volcanic rocks in the study area is obviously right-tilted, the large ion lithophile element RbsBaHU UU Pb is enriched, and the characteristics of relative depletion of high field strength element Nbtadao Ti.) the magmatic source region of Baishan volcanic rocks in the study area is not the primitive mantle, and the magmatic source of Baishan volcanic rocks in the study area is not the primitive mantle. The volcanic rocks of Baishan formation in the study area are the tectonic environment of the Andean continental margin arc, formed in subduction zone and characterized by continental margin arc tectonic environment.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P588.14

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