本文關(guān)鍵詞： 三疊系 珊瑚井組 沉積相 沉積亞相 含礦性分析　出處：《長安大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：研究區(qū)屬于內(nèi)蒙古自治區(qū)額濟(jì)納旗,地處荒漠戈壁,人煙稀少,交通閉塞。三疊系珊瑚井組是本次1:5萬區(qū)域礦產(chǎn)地質(zhì)調(diào)查項(xiàng)目實(shí)施過程中發(fā)現(xiàn)并劃分出的地層單元,前人1:20萬區(qū)調(diào)中將該地層歸入石炭系綠條山組。本文在前人研究的基礎(chǔ)上,以沉積巖石學(xué)、古生物學(xué)、礦床學(xué)等基礎(chǔ)理論為指導(dǎo),立足野外實(shí)測剖面、路線調(diào)查資料,結(jié)合微量元素分析資料、粒度分析資料、薄片鑒定資料、土壤地球化學(xué)資料等,對(duì)三疊紀(jì)地層的沉積建造、沉積環(huán)境、形成時(shí)代及找礦潛力進(jìn)行分析和研究,獲得如下成果和認(rèn)識(shí):(1)研究區(qū)該套地層屬于陸相紅色含礫粗碎屑巖建造并含有植物化石,依據(jù)區(qū)域?qū)Ρ葘⒃撎钻懴嗨樾紟r歸為三疊系珊瑚井組,其時(shí)代為晚三疊世。(2)根據(jù)三疊系珊瑚井組巖石組合特征,將珊瑚井組進(jìn)一步劃分為上下兩段,下段為粗碎屑巖組合,主要巖性為:紫紅色-紅褐色礫巖、含礫砂巖、細(xì)砂巖旋回;上段為細(xì)碎屑巖組合,主要巖性為:灰白色-灰色粗砂巖-細(xì)砂巖-粉砂巖-泥巖旋回。(3)通過對(duì)研究區(qū)三疊紀(jì)地層大量的野外實(shí)測和室內(nèi)資料研究,結(jié)合巖石顏色、結(jié)構(gòu)、構(gòu)造、粒度分析、微量元素等沉積相標(biāo)志,將研究區(qū)珊瑚井組地層劃分為2個(gè)沉積相、5個(gè)沉積亞相和8個(gè)沉積微相,即辮狀河相、曲流河相,其中辮狀河相又分為河床亞相、泛濫平原亞相;曲流河相分為河床亞相、河漫亞相和堤岸亞相;各沉積亞相又可以劃分出不同的沉積微相。(4)三疊系珊瑚井組地層中As、Sb、Pb、W元素豐度值較高,且相關(guān)性較好,元素高值主要分布于珊瑚井組砂礫巖中;該區(qū)的化探異常分布與珊瑚井組地層展布具有一致性,綜合研究認(rèn)為珊瑚井組砂礫巖受熱液及斷裂破碎帶影響As、Sb、Pb、W元素豐度值較高,具有一定找礦潛力。
[Abstract]:The research area belongs to the Ejina Banner of Inner Mongolia Autonomous region, located in the desert Gobi, sparsely populated and closed in traffic. The Triassic Coral well formation is a stratigraphic unit discovered and divided during the implementation of the 1: 50 000 regional mineral geological survey project. The strata are classified into the Lutiaoshan formation of Carboniferous in the 1:20 regional survey. Based on the previous studies, and guided by the basic theories of sedimentary petrology, paleontology and ore deposit science, this paper bases itself on the field measured profiles and route investigation data. Combined with trace element analysis data, grain size analysis data, sheet identification data and soil geochemical data, the sedimentary formation, sedimentary environment, forming age and prospecting potential of Triassic strata are analyzed and studied. The formation belongs to the continental red gravel-bearing coarse clastic rock formation and contains plant fossils. According to the regional correlation, the continental clastic rock is classified into Triassic coral well formation. According to the characteristics of the rock assemblages of the Triassic Coral well formation, the coralline well formation is further divided into the upper and lower sections, and the lower member is the coarse clastic rock assemblage, the main lithology is: purple-red-red-brown conglomerate, gravel-bearing sandstone. The upper member is composed of fine clastic rock assemblage, the main lithology is: grayish-gray coarse sandstone, fine sandstone, siltstone and mudstone cycle. Combined with the color, structure, structure, granularity analysis and trace elements of sedimentary facies, the formation of coral well formation in the study area is divided into 2 sedimentary facies, 5 sedimentary subfacies and 8 sedimentary microfacies, namely braided fluvial facies, meandering river facies, etc. The braided river facies are divided into river bed subfacies, flood plain subfacies, meandering river facies into river bed subfacies, river diffuse subfacies and embankment subfacies. Each sedimentary subfacies can be divided into different sedimentary microfacies. 4) the abundance value of element As-SbSbPbCW in the formation of Triassic coral well group is higher and the correlation is good. The high value of element is mainly distributed in the sand and gravel rock of the coral well group. The geochemical anomaly distribution in this area is consistent with the distribution of the formation of the coral well group. It is considered that the thermal fluid of the sandy gravel rock and the fracture fracture zone of the coral well group affect the abundance value of the element As-SbPbCw, which has a certain prospecting potential.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P534.51

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 朱宣清,何乃華;滹沱河(平原段)沉積物的粒度、比重及其在劃分河流亞相中的意義[J];地理學(xué)與國土研究;1985年03期

2 劉永成;姚鐘麒;柴向東;彭笑剛;李鐵津;;THT-TTF/硬脂酸組裝體系L-B膜的研究[J];寧波大學(xué)學(xué)報(bào)(理工版);1990年02期

3 劉曼玉;;薩南開發(fā)區(qū)各沉積單元亞相分布研究[J];內(nèi)蒙古石油化工;2012年10期

4 孫淑艷;謝剛;姜蕾;朱劍兵;;多屬性綜合判識(shí)三角洲亞相方法——以臨南洼陷雙豐三角洲為例[J];石油地球物理勘探;2009年01期

5 方維萱,胡瑞忠,張國偉,蘆紀(jì)英;秦嶺造山帶泥盆系熱水沉積巖相的亞相和微相劃分及特征[J];地質(zhì)與勘探;2001年02期

6 王林生;;洞庭盆地濱湖—河湖交替泥巖夾砂巖亞相的地球化學(xué)特征[J];湖南地質(zhì);1987年02期

7 朱杰;郭連紅;胡靜;王國棟;;制備條件對(duì)磷脂酰膽堿單分子膜相變行為的影響[J];生命科學(xué)儀器;2007年12期

8 王虎;鄭常青;王璞s，

本文編號(hào)：1510735