【摘要】：本文以四川北川甘溪下泥盆統(tǒng)甘溪剖面的野外風(fēng)暴沉積剖面實測資料為依據(jù),通過對甘溪組、謝家灣組和養(yǎng)馬壩組野外剖面結(jié)構(gòu)和沉積演化等的研究,進(jìn)而建立甘溪組、謝家灣組和養(yǎng)馬壩組風(fēng)暴沉積序列及分布模式,結(jié)合風(fēng)暴巖鑄體薄片微觀分析,初步探討風(fēng)暴巖的的形成及其地質(zhì)意義。北川甘溪下泥盆統(tǒng)甘溪組、謝家灣組和養(yǎng)馬壩組廣泛發(fā)育著風(fēng)暴沉積,多期次風(fēng)暴沉積垂向疊置,風(fēng)暴沉積特征明顯,侵蝕沖刷面、渠模構(gòu)造、生物介殼滯留沉積、平行層理、丘狀交錯層理和生物成因構(gòu)造等風(fēng)暴沉積構(gòu)造發(fā)育,其中發(fā)育7類風(fēng)暴沉積序列類型與3類風(fēng)暴沉積類型:近源砂質(zhì)風(fēng)暴沉積、近源混積風(fēng)暴沉積和遠(yuǎn)源砂質(zhì)風(fēng)暴沉積,其中,甘溪組、謝家灣組下段發(fā)育近源砂質(zhì)風(fēng)暴沉積,謝家灣組上段上部和養(yǎng)馬壩組發(fā)育近源混積風(fēng)暴沉積,而謝家灣組上段下部發(fā)育遠(yuǎn)源砂質(zhì)風(fēng)暴沉積。發(fā)育較典型的風(fēng)暴序列由侵蝕沖刷面和渠模(Sa)、生物介殼滯留層段(Sb)、平行層理段(Sc)、丘狀交錯層理段(Sd)和泥巖段(Se)組成。北川甘溪下泥盆統(tǒng)甘溪組、謝家灣組和養(yǎng)馬壩組風(fēng)暴巖巖性主要有:粉砂巖、泥質(zhì)粉砂巖、含生屑泥質(zhì)粉砂巖和砂質(zhì)生屑灰?guī)r,其中粉砂巖泥質(zhì)雜基含量較少,顆粒分選磨圓較好,指示風(fēng)暴對其改造具有一定建設(shè)性作用。風(fēng)暴沉積研究的地質(zhì)意義包括等時意義,古緯度意義,古地理意義,研究討論后確定甘溪地區(qū)下泥盆統(tǒng)地層當(dāng)時所處熱帶亞熱帶的低緯度地區(qū),沉積環(huán)境為淺海陸棚。
[Abstract]:Based on the field storm sedimentary profile of the lower Devonian Ganxi section in Ganxi, Beichuan, Sichuan Province, this paper studies the structure and sedimentary evolution of the field profile of Ganxi formation, Xie Jiawan formation and Yangmaba formation, and then establishes the Ganxi formation. The formation of storm rock and its geological significance are preliminarily discussed by combining the storm sedimentary sequence and distribution model of the Xiejiawan and Yangmaba formations with the microscopic analysis of the thin section of the storm rock cast. Storm deposits are widely developed in the lower Devonian Ganxi formation, Xie Jiawan formation and Yangmaba formation in Beichuan, Ganxi Basin, and Yangmaba formation, with vertical superposition of multi-stage storm deposition, obvious storm deposition characteristics, erosion surface, canal model structure, biological crust retention deposition, parallel stratification, etc. There are 7 types of storm sedimentary sequence types and 3 types of storm sedimentary types: near source sand storm deposition, near source mixed storm deposition and distant source sand storm deposition, among which, 7 types of storm sedimentary sequence and 3 types of storm sedimentary types are developed. Near source sandstorm deposits were developed in the lower member of Ganxi formation and Xijiawan formation, near source mixed storm deposition in upper part of the upper member of Xie Jiawan formation and Yangmaba formation, and distant sandstorm deposit in lower part of upper member of Xie Jia Wan formation. The typical storm sequence is composed of erosion surface and channel model (Sa), biologic shell retention section (Sb), parallel bedding segment (Sc), mound staggered bedding segment (Sd) and mudstone segment (Se). The storm lithology of the lower Devonian Ganxi formation, Xiejiawan formation and Yangmaba formation in Beichuan Ganxi Basin are mainly composed of siltstone, argillaceous siltstone, shredded siltstone and sandy shredded limestone. The particle separation and grinding round is better, indicating that the storm has a constructive effect on its transformation. The geological significance of storm sedimentary research includes isochronous, paleolatitude and paleogeographic significance. It is determined that the lower Devonian strata of Ganxi area were located in the low latitude of tropical subtropics at that time, and the sedimentary environment was shallow sea shelf.
【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】：2017
【分類號】：P512.2

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