【摘要】：我國(guó)華南地區(qū)新元古代晚期到寒武紀(jì)早期地層發(fā)育完整,保存完好,該地區(qū)的各項(xiàng)重大研究發(fā)現(xiàn)成果引起了國(guó)內(nèi)外地質(zhì)學(xué)者的的高度關(guān)注,使得華南地區(qū)成為進(jìn)行生命早期演化研究的國(guó)際經(jīng)典地區(qū)。南華系海洋的化學(xué)狀態(tài)的研究對(duì)于認(rèn)識(shí)新元古代時(shí)期的生物的演化以及成礦規(guī)律具有重要意義。本文在前人研究基礎(chǔ)上,通過(guò)野外地質(zhì)剖面及鉆井巖心的系統(tǒng)采樣,借助XRD、掃描電子顯微鏡和X射線熒光光譜儀等測(cè)試手段,分析松桃地區(qū)大塘坡組的巖石學(xué)特征,主、微量地球化學(xué)特征及巖石中鐵組分、硫同位素特征,分析古海洋環(huán)境的化學(xué)狀態(tài)。華南松桃南華系大塘坡組為一套海相沉積的巖石類(lèi)型,主要巖石類(lèi)型為碳質(zhì)頁(yè)巖、含錳碳質(zhì)頁(yè)巖、硅質(zhì)巖等。大塘坡組第二、三段主要巖石類(lèi)型有頁(yè)巖、粉砂質(zhì)頁(yè)巖、砂質(zhì)頁(yè)巖。研究區(qū)巖石樣品中含量最高的礦物為石英和粘土礦物。華南松桃大塘坡組的錳礦石樣品的n(Al_2O_3)/n(Al_2O_3+Fe_2O_3)等比值反映了遠(yuǎn)洋深海沉積特征,而圍巖具明顯的大陸邊緣沉積特征;n(SiO_2)/n(Al_2O_3)等比值都反映了南華系大塘坡組沉積物源以陸源為主,并伴隨著一定的熱水作用,且錳礦石的形成受熱水作用影響比較大;Sr/Ba指標(biāo)反映了大塘坡組巖系形成于深水環(huán)境中,大塘坡組二、三段巖石形成的水體深度相對(duì)較淺,為淺海陸棚到臺(tái)地邊緣斜坡過(guò)渡的環(huán)境;Rb/Sr等比值都反映了錳礦石形成于熱的氣候環(huán)境,而圍巖則形成于干燥的氣候環(huán)境,且氣候變化的波動(dòng)明顯;U、V、Mo等氧化還原指標(biāo)的研究顯示,大塘坡組第一段形成環(huán)境為較強(qiáng)的缺氧環(huán)境,而礦層和二、三段為弱缺氧-還原環(huán)境。華南松桃大塘坡組鐵組分及硫同位素?cái)?shù)據(jù)表明,大塘坡組第一段中錳礦石形成于缺氧鐵化的環(huán)境,而第一段圍巖形成于缺氧硫化的環(huán)境,第二、三段的沉積環(huán)境中幾乎無(wú)硫化水體的發(fā)展,開(kāi)始出現(xiàn)氧化的水體。綜合南華系大塘坡組地球化學(xué)特征、鐵組分及硫同位素?cái)?shù)據(jù)以及沉積環(huán)境等得出,松桃地區(qū)南華系大塘坡組的古海洋化學(xué)狀態(tài)總的來(lái)說(shuō)大致符合晚新元古代華南盆地的 三明治‖海洋化學(xué)模型,即表層為氧化水體,深部為缺氧鐵化的狀態(tài),而在二者之間淺海局部區(qū)域出現(xiàn)動(dòng)態(tài)的硫化的水體。
[Abstract]:The late Neoproterozoic to early Cambrian strata in South China are well developed and well preserved. It makes South China become the international classical area for the study of early life evolution. The study of the chemical state of the South China ocean is of great significance in understanding the evolution and metallogenic regularity of organisms in the Neoproterozoic period. On the basis of previous studies, this paper analyzes the petrological characteristics of Datangpo formation in Songtao area by means of systematic sampling of field geological profiles and drilling cores, and by means of XRD, scanning electron microscope and X-ray fluorescence spectrometer. The trace geochemical characteristics, iron composition and sulfur isotopic characteristics of the rocks are used to analyze the chemical state of the paleo-marine environment. The Datangpo formation of the South China Series of Songtao in South China is a set of marine sedimentary rock types, the main rock types are carbonaceous shale, manganese carbonaceous shale, siliceous rock and so on. The main rock types of the second and third member of Datangpo formation are shale, silty shale and sandy shale. Quartz and clay minerals are the most abundant minerals in rock samples in the study area. The ratios of n (Al_2O_3) / n (Al_2O_3 Fe_2O_3) of manganese ore samples of Songtao Datangpo formation in South China reflect the deep-sea sedimentary characteristics, while the surrounding rocks have obvious continental margin sedimentary characteristics. The ratios of n (SiO_2) / n (Al_2O_3) all reflect that the sediment source of Datangpo formation of South China series is mainly continental and accompanied by certain hot water, and the formation of manganese ore is greatly influenced by hot water. The Sr/Ba index reflects that the rock series of the Datangpo formation was formed in the deep water environment, and the water depth of the second and third sections of the Datangpo formation is relatively shallow, which is the environment of the transition from the shallow sea shelf to the platform margin slope. The ratios of Rb/Sr and so on reflect that manganese ore is formed in the hot climate environment, while the surrounding rock is formed in the dry climate environment, and the fluctuation of climate change is obvious. The study of redox indexes such as U _ (V) Mo shows that the formation environment of the first member of the Datangpo formation is a strong anoxic environment, while the ore-bed and the second and third stages are weak anoxia-reduction environment. The iron composition and sulfur isotopic data of Datangpo formation in Songtao, South China show that the manganese ores in the first member of the Datangpo formation were formed in anoxic iron-forming environment, while the surrounding rocks in the first section were formed in the environment of anoxic sulfidation. The depositional environment of the third member almost has no sulphide water development, and the oxidized water body begins to appear. Based on the geochemical characteristics of the Datangpo formation of the South China series, the data of iron and sulfur isotopes, and the sedimentary environment, etc., The paleo-marine chemical state of the Datangpo formation of the South China series in Songtao area is generally consistent with the marine chemistry model of the late Neoproterozoic South China basin, I. E. the surface layer is oxidized water body and the deep layer is anoxic iron. Dynamic sulfided water appeared in the local area of shallow water between them.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：P596

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 劉雨;周琦;袁良軍;潘文;張遂;余文超;王萍;徐源;洪萬(wàn)華;;黔東松桃大塘坡地區(qū)南華系大塘坡組錳礦相帶及分布規(guī)律[J];地質(zhì)科技情報(bào);2015年06期

2 LI Chao;CHENG Meng;Thomas J.ALGEO;XIE ShuCheng;;A theoretical prediction of chemical zonation in early oceans(>520 Ma)[J];Science China(Earth Sciences);2015年11期

3 吳承泉;張正偉;肖加飛;符亞洲;邵樹(shù)勛;鄭超飛;;貴州東部及鄰區(qū)南華紀(jì)錳礦床地球化學(xué)特征及成因研究[J];吉林大學(xué)學(xué)報(bào)(地球科學(xué)版);2015年S1期

4 吳承泉;程遠(yuǎn);張正偉;肖加飛;符亞洲;邵樹(shù)勛;鄭超飛;姚俊華;;貴州東部及鄰區(qū)南華紀(jì)錳礦中黃鐵礦硫同位素高異常及地質(zhì)意義[J];地球化學(xué);2015年03期

5 裴浩翔;付勇;徐志剛;溫宏利;安正澤;;貴州道坨錳礦菱錳礦的稀土元素特征[J];沉積與特提斯地質(zhì);2015年01期

6 孫夢(mèng)迪;于炳松;夏威;祁青山;葉若辰;;渝東南地區(qū)下志留統(tǒng)底部黑色巖系沉積環(huán)境及有機(jī)質(zhì)富集機(jī)制——以鹿角剖面為例[J];東北石油大學(xué)學(xué)報(bào);2014年05期

7 何志威;楊瑞東;高軍波;程偉;劉帥;張峰瑋;;貴州松桃道坨錳礦含錳巖系地球化學(xué)特征和沉積環(huán)境分析[J];地質(zhì)論評(píng);2014年05期

8 金承勝;李超;彭興芳;崔豪;石煒;張子虎;羅根明;謝樹(shù)成;;華南寒武紀(jì)早期海洋化學(xué)狀態(tài)的時(shí)空波動(dòng)[J];中國(guó)科學(xué):地球科學(xué);2014年05期

9 謝小峰;覃英;溫官?lài)?guó);謝興友;;淺論貴州銅仁松桃錳礦區(qū)大塘坡組地層與錳礦成礦的關(guān)系[J];貴州地質(zhì);2014年01期

10 向文勤;肖永開(kāi);;銅仁-松桃地區(qū)南華系大塘坡式錳礦地質(zhì)特征及成礦規(guī)律探討[J];西南科技大學(xué)學(xué)報(bào);2013年04期

相關(guān)博士學(xué)位論文 前8條

1 程猛;新元古代至寒武紀(jì)化學(xué)分層海洋中的鉬生物地球化學(xué)循環(huán)[D];中國(guó)地質(zhì)大學(xué);2016年

2 湯冬杰;華北地臺(tái)中元古代微生物巖：微組構(gòu)、有機(jī)礦化過(guò)程及其古海洋環(huán)境研究[D];中國(guó)地質(zhì)大學(xué)（北京）;2013年

3 宋虎躍;中生代初海洋碳—硫循環(huán)與氧化還原環(huán)境的異常演變[D];中國(guó)地質(zhì)大學(xué);2013年

4 王敏;黔東北梵凈山地區(qū)晚元古代巖漿活動(dòng)及其大地構(gòu)造意義[D];中國(guó)地質(zhì)大學(xué)(北京);2012年

5 王林;華南埃迪卡拉紀(jì)陡山沱期古海洋環(huán)境的氧化還原特征[D];中國(guó)地質(zhì)大學(xué)(北京);2012年

6 楊劍;黔北地區(qū)下寒武統(tǒng)黑色巖系形成環(huán)境與地球化學(xué)研究[D];長(zhǎng)安大學(xué);2009年

7 王淑玲;我國(guó)西部地區(qū)礦產(chǎn)資源優(yōu)勢(shì)綜合評(píng)價(jià)[D];中國(guó)地質(zhì)大學(xué)（北京）;2006年

8 陳蘭;湘黔地區(qū)早寒武世黑色巖系沉積學(xué)及地球化學(xué)研究[D];中國(guó)科學(xué)院研究生院（地球化學(xué)研究所）;2006年

相關(guān)碩士學(xué)位論文 前6條

1 王丹;黔東地區(qū)新元古代“大塘坡式”錳礦沉積地球化學(xué)條件研究[D];成都理工大學(xué);2015年

2 王佳;貴州桃映下寒武統(tǒng)牛蹄塘組黑色頁(yè)巖中草莓狀黃鐵礦的粒徑特征及其環(huán)境意義[D];成都理工大學(xué);2013年

3 楊東升;貴州松桃白石溪錳礦床地質(zhì)地球化學(xué)特征及成礦規(guī)律研究[D];中南大學(xué);2013年

4 楊燁;華北地臺(tái)中元古代下馬嶺組沉積期古海洋環(huán)境的地球化學(xué)證據(jù)[D];中國(guó)地質(zhì)大學(xué)（北京）;2013年

5 余文剛;貴州西溪堡錳礦區(qū)含錳巖系元素地球化學(xué)特征及控礦意義[D];長(zhǎng)江大學(xué);2013年

6 李丹秋;華北地臺(tái)中元古代高于莊組沉積期古海洋環(huán)境條件：沉積地質(zhì)與地球化學(xué)證據(jù)[D];中國(guó)地質(zhì)大學(xué)（北京）;2012年

，

本文編號(hào)：2334017