本文選題：基性-超基性巖 + 巖石地球化學(xué)　； 參考：《成都理工大學(xué)》2015年碩士論文

【摘要】：攀西地區(qū)基性-超基性巖是峨眉火成巖省的組成部分之一,本次研究主要對攀西地區(qū)的白馬礦區(qū)、紅格礦區(qū)和攀枝花礦區(qū)三個(gè)含礦基性-超基性巖體進(jìn)行巖石地球化學(xué)對比分析,總結(jié)基性-超基性巖巖石地球化學(xué)特征,對比分析三個(gè)礦區(qū)的相關(guān)性,初步取得以下幾方面的認(rèn)識:(1)根據(jù)巖體和構(gòu)造的關(guān)系,將攀西地區(qū)基性-超基性巖體分為兩個(gè)主要的亞帶,其中屬于安寧河亞帶的基性-超基性含礦巖體主要分布于安寧河亞帶附近,北起太和礦體,向南經(jīng)白馬巖體至紅格巖體,以層狀基性-超基性巖為主;攀枝花亞帶的基性-超基性巖體主要分布在攀枝花斷裂帶的東面,以大-小型層狀基性-超基性巖體為主,巖體內(nèi)釩鈦磁鐵礦呈似層狀產(chǎn)出,層位穩(wěn)定。(2)攀西地區(qū)巖體韻律層理及巖相旋回發(fā)育,其中韻律是固化面推進(jìn)與巖漿化學(xué)擴(kuò)散耦合的結(jié)果,而巖相旋回則表現(xiàn)為巖相組合的規(guī)律性重復(fù),總體而言從上至下基性程度逐漸升高,而韻律旋回特征表明攀西地區(qū)巖漿多期次的特征,成礦的主要基性,超基性巖體基本都處于旋回的中下部。(3)從韻律特征分析可以看出:攀西地區(qū)主要造巖礦物的色率、含量和化學(xué)成分等在垂向上更替疊置形成交替的條帶互層,巖體從上至下色率大致從淺變暗,巖體整體可分為若干個(gè)韻律層,而且每個(gè)大的韻律層里還含有小的韻律層,并且大小韻律層的色率都是從上至下色率逐漸變深。(4)通過分析攀西地區(qū)紅格礦區(qū)、白馬礦區(qū)和攀枝花礦區(qū)巖石地球化學(xué)特征得出:三個(gè)礦區(qū)基性-超基性巖都屬于高鉀拉斑玄武巖系列,氧化物和MgO的相關(guān)圖解上可以看出氧化物一直參與巖漿的分異結(jié)晶過程,而從稀土元素球粒隕石標(biāo)準(zhǔn)化分布型式圖上分析發(fā)現(xiàn)攀枝花礦區(qū)、白馬礦區(qū)具有明顯的Eu正異常,而紅格礦區(qū)Eu異常不明顯,從微量元素原始地幔標(biāo)準(zhǔn)化蛛網(wǎng)圖上,可以看出三個(gè)礦區(qū)的巖石樣品都出現(xiàn)虧損高場強(qiáng)元素Zr的特征。(5)通過總結(jié)前人的年齡數(shù)據(jù),得出攀西地區(qū)基性-超基性巖體的形成時(shí)代和峨眉山玄武巖的主噴發(fā)時(shí)期是一致的,大約為260±2Ma。表明峨眉山玄武巖與攀西基性-超基性巖體應(yīng)該為巖漿演化過程中同源異相的產(chǎn)物。
[Abstract]:The basic-ultrabasic rock in Panxi area is one of the components of Emei igneous province.Three ore-bearing basic-ultrabasic rock bodies in Hongge and Panzhihua mining areas were compared and analyzed, and the petrogeochemical characteristics of basic-ultrabasic rocks were summarized, and the correlation of the three ore areas was compared and analyzed.According to the relationship between rock mass and structure, the basic-ultrabasic rock body in Panxi area is divided into two main subzones.The basic-ultrabasic ore-bearing rock bodies belonging to the Anning River subzone are mainly distributed near the Anning River subzone, starting from the Taihe orebody in the north, running south through the Baima rock body to the Hongge rock body, and mainly stratiform basic-ultrabasic rock.The basic-ultrabasic rock bodies in the Panzhihua subzone are mainly distributed in the east of the Panzhihua fault zone, dominated by the large and small layered basic-ultrabasic rocks, and the vanadium titanomagnetite in the rock body is bedded.The rhythmic bedding and lithofacies cycle of rock mass in Panxi area are characterized by the coupling of solidified surface propulsion and magmatic chemical diffusion, while the lithofacies cycle is characterized by the repeated regularity of lithofacies assemblage.In general, the degree of basicity gradually increased from top to bottom, while the rhythmic cycle characteristics indicated that the magma in Panxi area was characterized by multi-stage magma and the main metallogenic elements.From the analysis of rhythmic characteristics, it can be seen that the color rate, content and chemical composition of the major rock-forming minerals in Panxi area are superimposed vertically to form alternate banded interbeds.From top to bottom, the color rate of rock mass changes from shallow to dark, and the whole rock mass can be divided into several rhythmic layers, and each of the large rhythmic layers also contains small rhythmic layers.And the color rate of the large and small prosodic layers is gradually becoming deeper from top to bottom.) through the analysis of Hongge mining area in Panxi area,The petrogeochemical characteristics of Baima and Panzhihua mining areas show that the basic-ultrabasic rocks belong to the high-potassium tholeiite series. The related diagrams of oxides and MgO show that oxides have been involved in the differentiation and crystallization of magma.From the analysis of the standardized distribution pattern of chondrites of rare earth elements, it is found that in Panzhihua mining area, the Baima ore area has obvious positive EU anomaly, while the EU anomaly in Hongge mine is not obvious.It can be seen that the characteristics of depleted high field strength element Zr in rock samples in the three mining areas are consistent with the main eruption period of Emeishan basalt by summarizing the previous age data and drawing the conclusion that the age of the basaltic body in Panxi area is the same as that of the Emeishan basalt.About 260 鹵2 Ma.It is suggested that Emeishan basalt and Panxi basalt-ultrabasic rock body should be the product of homologous facies during magmatic evolution.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P588.12;P611

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