本文選題：灰?guī)r—泥灰?guī)r韻律層 + 地化特征�。� 參考：《成都理工大學(xué)》2017年碩士論文

【摘要】：韻律層一直是地層學(xué)家和古氣候?qū)W家重點(diǎn)研究對(duì)象,是研究高分辨率旋回地層學(xué)的重要載體。在我國(guó)灰?guī)r—泥灰?guī)r韻律層的研究主要集中在華南地區(qū),且研究主要集中在灰?guī)r—泥灰?guī)r韻律層的差異成巖作用方面,而關(guān)于灰?guī)r—泥灰?guī)r韻律層的全面研究則比較少見(jiàn)。在龍門山區(qū)泥盆系土橋子組最大海泛面兩側(cè),發(fā)育有三套特征明顯的灰?guī)r—泥灰?guī)r韻律層。運(yùn)用土橋子組灰?guī)r—泥灰?guī)r韻律層的野外剖面實(shí)測(cè)、薄片觀察和地球化學(xué)特征,重點(diǎn)研究其成因機(jī)制。根據(jù)野外實(shí)測(cè)剖面資料和沉積特征,分析得出土橋子組主要發(fā)育三種沉積相類型:碳酸鹽臺(tái)地、碳酸鹽緩坡和盆地相。這三種沉積相類型在土橋子組沉積演化上交替出現(xiàn)。通過(guò)對(duì)常量元素SiO_2、Fe_2O_3、FeO、Al_2O_3、TiO_2、CaO、MgO、K_2O、Na_2O、MnO和P_2O_5的分析,表明灰?guī)r、泥灰?guī)r在常量元素的化學(xué)組成上基本呈現(xiàn)一致的趨勢(shì)。CaO、SiO_2和Al_2O_3在灰?guī)r、泥灰?guī)r中占有很大的比重,其余常量元素所占比重則很低。對(duì)微量元素V、Cr、Co、Ni、Cu、Zn、As、Rb、Sr、Zr、Cd、Ba、Th和U的分析表明,灰?guī)r與泥灰?guī)r的微量元素組成及比例也存在極大的相似性。通過(guò)分析灰?guī)r、泥灰?guī)r的酸不溶物、燒失剩余物跟各元素的相關(guān)性,發(fā)現(xiàn)SiO_2、Al_2O_3、K_2O、MnO、TiO_2和Cr等的含量與酸不溶物含量都呈很大的相關(guān)性。尤其是SiO2與酸不溶物的相關(guān)性達(dá)到了0.93。并在此基礎(chǔ)上,分析元素的來(lái)源,為研究灰?guī)r—泥灰?guī)r韻律層提供可靠的元素基礎(chǔ)。通過(guò)古氧相U/Th、古鹽度Sr/Ba、古水深MnO、古氣候Sr/Cu等分析,研究灰?guī)r—泥灰?guī)r韻律層形成時(shí)的古環(huán)境與古氣候。認(rèn)為灰?guī)r—泥灰?guī)r韻律層形成于炎熱氣候下的貧氧海相高水位體系域沉積環(huán)境。古氣候和差異成巖作用是灰?guī)r—泥灰?guī)r韻律層的主要成因,其中在較大的宏觀尺度上古氣候的韻律和波動(dòng)控制著韻律層的古環(huán)境和地球化學(xué)特征,而在較小的微觀尺度上差異成巖作用進(jìn)一步控制和影響著韻律層地球化學(xué)特征的分異性和韻律性。
[Abstract]:Prosodic layer has been the important research object of stratigraphers and paleoclimatologists and an important carrier of high resolution cyclic stratigraphy. In China, the study of lime-marl rhythms is mainly concentrated in South China, and the study is mainly focused on the differential diagenesis of lime-marl rhythms, but the comprehensive study on lime-marl rhythms is rare. On the two sides of the largest flooding surface of the Devonian Tuqiao formation in Longmen Mountain area, there are three sets of distinct lime-mudstone rhythms. Based on the field profile, thin section observation and geochemical characteristics of the lime-marl rhythmic layer of Tuqiao formation, the genetic mechanism is emphatically studied. Based on the field measured profile data and sedimentary characteristics, it is concluded that three types of sedimentary facies are mainly developed in Tuqiao formation: carbonate platform, carbonate gentle slope and basin facies. These three types of sedimentary facies alternately appeared in the sedimentary evolution of Tuqiao formation. Based on the analysis of the main element SiO2SiFe2O3S / SiOSiO2 / Al2O3TiO2TiO2CaOTiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2TiO2Ti@@ The analysis of trace elements such as the trace elements V _ (C _ (C) _ (CoA) _ (Cu) ~ (2 +) Zn ~ (2 +) ~ (2 +) ~ (2 +) ~ (2) ~ (2 +) ~ (2 +) ~ (2) ~ (2) ~ (2) ~ (2 +) Rbsrbszr@@ By analyzing the correlation between acid insoluble matter, burning residue and various elements in limestone and marl, it is found that the contents of SiO2Al2O3, MnO2O2 and Cr are closely related to the content of acid-insoluble substance. In particular, the correlation between SiO2 and acid insoluble was 0.93. On this basis, the source of elements is analyzed to provide a reliable element basis for the study of lime-marl rhythms. The paleoclimate and paleoclimate during the formation of lime-mudstone rhythmic layer were studied by the analysis of paleo oxygen phase U / T, paleosalinity Sr / Ba, ancient water depth MNO and paleoclimate Sr/Cu. It is considered that the rhythmic layer of limestone and marl was formed in the sedimentary environment of oxygen-poor marine high water level system tract in hot climate. Paleoclimate and differential diagenesis are the main genesis of lime-marl rhythm layer, in which the rhythm and fluctuation of paleoclimate control the paleoenvironment and geochemistry of the rhythmic layer at large macro scale. The differential diagenesis further controls and affects the differentiation and rhythm of the geochemical characteristics of the prosodic strata on a small microscopic scale.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P534.44

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