【摘要】：本文通過野外剖面的實測、露頭觀察和巖石宏觀描述以及樣品采樣等多種分析手段,結(jié)合室內(nèi)顯微觀察、陰極發(fā)光等微觀研究方法,在碳酸鹽沉積學(xué)、古生物學(xué)與成巖作用等相關(guān)理論的支撐下,對四川宣漢渡口河剖面三疊系飛仙關(guān)組地層碳酸鹽巖石學(xué)特征、沉積相以及成巖作用等方面進行了系統(tǒng)的研究。巖石學(xué)是碳酸鹽巖研究中最為基礎(chǔ)的領(lǐng)域,也是解決碳酸鹽巖研究領(lǐng)域各種問題最為有效的方法。四川宣漢渡口河剖面三疊系飛仙關(guān)組地層巖性以碳酸鹽巖為主,基本不含碎屑巖,其中碳酸鹽巖巖石類型主要有:微晶灰?guī)r、泥微晶白云巖、亮晶灰質(zhì)微晶白云巖、亮晶鮞�；�?guī)r、泥晶灰?guī)r、生屑微晶灰?guī)r、含生屑微晶灰?guī)r等,通過室內(nèi)顯微觀察與陰極發(fā)光分析等,詳細(xì)闡述了各類巖石特征。在前人的研究基礎(chǔ)上,結(jié)合野外宏觀現(xiàn)象、室內(nèi)巖石學(xué)特征以及古生物特征等,對四川宣漢渡口河剖面三疊系飛仙關(guān)地層沉積環(huán)境進行了分析,并劃分了相應(yīng)的沉積亞相,分別是潮坪、淺灘、瀉湖和蒸發(fā)坪。渡口河剖面飛仙關(guān)組地層碳酸鹽巖主要經(jīng)歷的成巖作用有:泥晶化作用、膠結(jié)作用、壓實-壓溶作用、重結(jié)晶作用等,根據(jù)一些特殊的巖石組構(gòu)以及成巖作用特征,劃分出研究剖面飛仙關(guān)地層經(jīng)歷的成巖環(huán)境:淺海海底成巖環(huán)境、淺埋藏成巖環(huán)境以及中-深埋藏成巖環(huán)境。
[Abstract]:In this paper, by means of field profile measurement, outcrop observation, rock macroscopic description and sample sampling, combined with indoor microscopic observation, catholuminescence and other microscopic research methods, carbonate sedimentology, Based on the related theories of paleontology and diagenesis, the carbonate petrology, sedimentary facies and diagenesis of the Triassic Feixianguan formation in the Dukou River section of Xuanhan, Sichuan Province were systematically studied. Petrology is the most basic field in carbonate research and the most effective method to solve various problems in carbonate research field. The stratigraphic lithology of the Triassic Feixianguan formation in the Xuanghan Dukou River section, Sichuan Province, is mainly carbonate rock, basically without clastic rock. The carbonate rock types mainly include: microcrystalline limestone, mudstone microcrystalline dolomite, bright grain-grained microcrystalline dolomite. The characteristics of various kinds of rocks are described in detail by laboratory microscopic observation and cathodoluminescence analysis, such as bright crystal oolitic limestone, argillite limestone, bioclastic microcrystalline limestone and bioclastic microcrystalline limestone. On the basis of previous studies, the sedimentary environment of the Triassic Feixianguan strata in the Xuanghan Dukou River section, Sichuan Province, is analyzed, and the corresponding sedimentary subfacies are divided according to the macroscopic phenomena in the field, the indoor petrological characteristics and the paleobiological characteristics. They are tidal flat, shallow beach, lagoon and evaporation flat. The diagenesis of carbonate rocks in the Feixianguan formation of Dukouhe section mainly includes: mud crystallization, cementation, compact-pressure solution, recrystallization, etc. According to some special rock fabric and diagenesis characteristics, The diagenetic environments of the Feixianguan strata in the research section are divided into three parts: shallow sea benthic diagenetic environment, shallow buried diagenetic environment and intermediate-deep burial diagenetic environment.
【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】：P618.13;P588.245

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本文編號：2140366