本文選題：雜鹵石 + 溴氯系數(shù)��； 參考：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：我國是目前世界上最大的鉀肥消費國家,但鉀肥資源的儲備在中國缺乏,很難滿足農(nóng)業(yè)的需求。四川盆地三疊紀(jì)是中國重要的成鹽盆地,以前的探索發(fā)現(xiàn)三疊紀(jì)嘉陵江組和雷口坡組有厚達千米的含鹽系。除了大量的鹽和混合鹵化物,還發(fā)現(xiàn)有鉀明礬石及鉀鎂鹽等,說明了該地區(qū)有較好的成鉀條件。本論文依托于中國地質(zhì)科學(xué)院礦產(chǎn)資源研究所973項目“中國陸塊海相成鉀規(guī)律及預(yù)測研究”第二課題“四川三疊紀(jì)古特提斯海盆成鉀條件、機理和后期演化”,主要對四川盆地長平三井含鹽系鉆井巖心及四川盆地內(nèi)的鹵水樣品進行了巖石學(xué),礦物學(xué),地球化學(xué)和氫、氧同位素等方面的研究,并結(jié)合前人的研究資料,初步嘗試探討了這些實物資料揭示的成鹽成鉀條件。通過鉆孔編錄分析,將長平三井含鹽系分為自上而下的三個成鹽沉積旋回。反復(fù)的海進和海退現(xiàn)象在該套地層的沉積過程中時常伴隨,使得原始水體的濃度發(fā)生反復(fù)變化。長平三井含鹽系包含有三個主要的含鹽層位,鹽層累計厚度達到52.37m。其含鹽系主要礦物有石鹽、硬石膏、雜鹵石、白云石、方解石等,通過對雜鹵石的鑒定分析,認為其中的微粒狀雜鹵石,主要呈薄層狀集合體分布于石鹽中,為水體在發(fā)生蒸發(fā)濃縮時原生析出形成;蕉葉狀或短柱狀雜鹵石多為單體顆粒,為水體早期蒸發(fā)濃縮的成鹽過程中經(jīng)過重結(jié)晶作用而形成。通過對長平三井含鹽系地球化學(xué)溴氯系數(shù)的研究,發(fā)現(xiàn)長平三井含鹽系溴氯系數(shù)普遍較高,部分層位溴氯系數(shù)值顯示已達鉀鎂鹽的析出階段。并有來自盆地內(nèi)或其他次級盆地的濃鹵水的補給發(fā)生在各個鹽層的沉積起始階段。通過對四川盆地內(nèi)三疊系鹵水樣品的地球化學(xué)分析,發(fā)現(xiàn)鹵水主要成分為Na Cl,大多數(shù)樣品顯示較貧Ca2+、Mg2+和SO42-。其中,有4個樣品的K含量較高,已達開采及工業(yè)生產(chǎn)利用的經(jīng)濟價值。對鹵水樣品氫、氧同位素的分析,認為鹵水的成因絕大多數(shù)屬于海相沉積-大氣降水疊加型,其成因既與大氣降水的滲入有關(guān),同時也與海水的補給有關(guān),并有較為活躍的水-巖交換作用的伴隨。
[Abstract]:China is the largest potash consumption country in the world at present, but the reserve of potash fertilizer resources is scarce in China, so it is difficult to meet the demand of agriculture. The Triassic of Sichuan Basin is an important salt-forming basin in China. Previous explorations have found that the Jialingjiang formation and the Leikoupo formation of Triassic have a salt bearing series of km thick. In addition to a large amount of salt and mixed halides, potassium alunite and potassium magnesium salts are found, which indicates that there are better conditions for potassium formation in this area. This paper is based on the project 973 of the Institute of Mineral Resources of the Chinese Academy of Geological Sciences, "study on the regularity and prediction of the formation of potassium from land blocks and seas in China", the second topic, "conditions, mechanisms and late evolution of the Triassic Paleotertes basin in Sichuan Province". In this paper, petrology, mineralogy, geochemistry and hydrogen and oxygen isotopes were studied in the core of the salt bearing well of Changping well No. 3 in Sichuan Basin and the brine samples in Sichuan Basin. The conditions of salt forming and potassium formation revealed by these physical data were preliminarily discussed. Through the analysis of borehole cataloguing, the salt bearing system of Changping Sanjing is divided into three salt forming cycles from top to bottom. The repeated transgression and regression phenomena are often accompanied by the sedimentary process of this set of strata, which makes the concentration of the original water body change repeatedly. The salt bearing system of Changping Sanjing has three main salt-bearing beds, and the accumulative thickness of the salt beds is 52.37 m. The main minerals of the salt bearing series are stone salt, anhydrite, heterohalite, dolomite, calcite and so on. Through the identification and analysis of the heterohalite, it is considered that the microgranular heterohalide is mainly distributed in the salt as a thin layer aggregate. It is suggested that the primary precipitate is formed when the water body evaporates and condensed, and the banana leaf or short columnar heterohalite is formed by recrystallization during the salt forming process of evaporation and concentration in the early stage of evaporation and concentration of water body, most of which are monomeric particles. Based on the study of the geochemical bromochlorine coefficient of salt bearing series in Changping Sanjing well, it is found that the bromine chlorine coefficient of salt bearing system in Changping Sanjing well is generally high, and the bromine chlorine coefficient value of some layers indicates that the precipitation stage of potassium and magnesium salt has been reached. The recharge of the concentrated brine from the basin or other secondary basins occurs at the sedimentary initiation stage of each salt bed. Based on the geochemical analysis of Triassic brine samples in Sichuan Basin, it is found that the main component of brine is NaCl, and most of the samples show poor Ca2 Mg2 and SO42-. Among them, four samples have high K content, which has reached the economic value of mining and industrial production. Based on the analysis of hydrogen and oxygen isotopes of brine samples, it is concluded that the origin of brine is mostly marine sedimentation-atmospheric precipitation superposition type, which is related to the infiltration of atmospheric precipitation and the recharge of sea water at the same time. And there is a more active water-rock exchange with.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P619.211

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