【摘要】：本論文在巖石學(xué)、沉積學(xué)、地層學(xué)等學(xué)科理論指導(dǎo)下,通過收集和研究前人資料的基礎(chǔ)上,通過野外地質(zhì)調(diào)查、測(cè)試分析資料和室內(nèi)綜合研究分析等手段,以內(nèi)蒙古額濟(jì)納旗拐子湖一帶二疊紀(jì)地層、及古生物等特征研究為基礎(chǔ),開展了二疊系地層劃分和厘定、地層層序及沉積相特征的研究。拐子湖西北角的原二疊系雙堡塘組,依據(jù)巖石組合特征區(qū)域?qū)Ρ?在原二疊系雙堡塘組底部識(shí)別出一套變質(zhì)巖系,變質(zhì)程度高的片麻巖系劃歸下元古界北山群,其淺變質(zhì)巖系劃分歸中元古界長(zhǎng)城系古硐井群。巖石學(xué)研究表明,區(qū)內(nèi)該套地層巖石類型主要為碎屑巖,根據(jù)巖石組合特征區(qū)域?qū)Ρ群捅编弲^(qū)古生物組合,將原二疊系雙堡塘組上部未變質(zhì)的碎屑巖組合劃分為二疊系雙堡塘組,其時(shí)代為早二疊世。以二疊系雙堡塘組為研究對(duì)象,對(duì)研究區(qū)進(jìn)行二疊系雙堡塘組露頭層序地層學(xué)研究,將區(qū)內(nèi)劃分為1個(gè)二級(jí)層序和3個(gè)三級(jí)層序,并對(duì)各基本層序、各級(jí)層序、體系域及準(zhǔn)層序特征進(jìn)行了總結(jié)。初步劃分出1個(gè)準(zhǔn)層序類型,為自下而上由細(xì)變粗準(zhǔn)層序。體系域類型分別為低位體系域、海侵體系域和高位體系域。根據(jù)巖石特征、沉積構(gòu)造、古生物標(biāo)志及微量元素等標(biāo)志,將研究區(qū)二疊系雙堡塘組沉積環(huán)境劃分為淺海環(huán)境和無障壁海岸環(huán)境。并進(jìn)一步劃分了四個(gè)亞相類型,分別為前濱亞相、近濱亞相、過渡帶亞相和濱外陸棚亞相。
[Abstract]:Under the guidance of petrology, sedimentology, stratigraphy and other disciplines, based on the collection and study of previous data, this paper adopts the methods of field geological survey, test and analysis data and indoor comprehensive research and analysis. Based on the study of Permian strata and paleontology in the area of Guizi Lake in Ejina Banner, Inner Mongolia, the stratigraphic division and determination, stratigraphic sequence and sedimentary facies characteristics of Permian have been studied. According to the regional correlation of the characteristics of the Permian rocks, a set of metamorphic rock series was identified at the bottom of the original Permian Shuangbaotang formation in the northwest corner of Guizi Lake. The gneiss series with high metamorphism was classified into the Lower Proterozoic Beishan Group. Its shallow metamorphic rock series is divided into the Middle Proterozoic the Great Wall ancient well group. The petrological study shows that the rock types in this area are mainly clastic rocks. According to the regional correlation of rock assemblages and the paleontological assemblages in the north adjacent area, The unmetamorphosed clastic rock assemblages of the upper part of the original Permian Shuangbaotang formation are divided into the Permian Shuangbaotang formation at an early Permian age. Taking the Shuangbaotang formation of Permian system as the research object, the outcrop sequence stratigraphy of the Shuangbaotang formation of the Permian system is studied. System tracts and quasi-sequence characteristics are summarized. One type of quasequence is preliminarily divided, which is from fine to coarse from bottom to top. The types of system tracts are low system tracts, transgressive system tracts and high system tracts. According to the characteristics of rocks, sedimentary structures, paleobiological markers and trace elements, the sedimentary environment of the Permian Shuangbaotang formation in the study area is divided into shallow sea environment and non-barrier coastal environment. Four subfacies are further divided, namely, foreshore subfacies, proximal subfacies, transitional zone subfacies and off-shore shelf subfacies.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P534.46

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本文編號(hào)：2376564