本文選題：奧陶系 + 沉積地層�。� 參考：《成都理工大學(xué)》2017年碩士論文

【摘要】：研究區(qū)在大地構(gòu)造單元上屬于特體斯-喜馬拉雅構(gòu)造帶(域),存在于岡瓦納大陸與勞亞大陸之間,該區(qū)的西部與保山地塊東緣相鄰,中間地帶是揚(yáng)子西緣多島-弧盆系昌寧混雜巖帶,蘭坪-思茅前陸盆地在研究區(qū)的東部;在中國(guó)西南板塊運(yùn)動(dòng)學(xué)、動(dòng)力學(xué)和板塊邊緣造山與成巖成礦作用的研究中是最理想的場(chǎng)所。灣甸壩地區(qū)奧陶系地層是昌寧-孟連帶西側(cè)保山-鎮(zhèn)康地塊的組成部分,地層出露連續(xù),是研究該區(qū)奧陶系沉積環(huán)境的良好載體。本文是在云南保山-龍陵地區(qū)灣甸壩、勐統(tǒng)街等5幅區(qū)域地質(zhì)礦產(chǎn)調(diào)查野外工作的基礎(chǔ)上,搜集并整理前人在本研究區(qū)以及在鄰區(qū)的相關(guān)研究資料,最后對(duì)本研究區(qū)內(nèi)奧陶系地層老尖山組、施甸組、蒲縹組和仁和橋組地層的資料分析研究后完成的。以前人的相關(guān)研究為基礎(chǔ),通過(guò)對(duì)灣甸壩地區(qū)奧陶系地層沉積相的確定及沉積環(huán)境演化的研究,主要取得以下幾點(diǎn)認(rèn)識(shí):首先查明了滇西-灣甸壩地區(qū)的奧陶系地層都為碎屑巖建造。然后通過(guò)對(duì)灣甸壩地區(qū)奧陶系地層沉積相特征的綜合研究得出:老尖山組是濱海相,從上往下分為潮上帶、高潮泥坪帶、潮間帶;施甸組為淺海陸棚相,過(guò)渡帶亞相;蒲漂組是淺海陸棚相,濱外陸棚亞相;仁和橋組是臺(tái)盆相。綜合奧陶系構(gòu)造演化分析沉積環(huán)境演化:保山-鎮(zhèn)康地塊區(qū)域性拗陷,沉積奧陶系至中志留統(tǒng)地層,后區(qū)域隆升。晚寒武世主要是一套淺海-開(kāi)闊臺(tái)地相粉砂-泥質(zhì)及碳酸鹽沉積,海平面沉降于晚寒武世晚期,而在早奧陶世晚期開(kāi)始出現(xiàn)新一輪海侵,并在仁和橋組之后進(jìn)入高水位體系域的穩(wěn)定沉積。最后得到研究區(qū)內(nèi)只有老尖山組保存有海退的層序,其余施甸組和蒲縹組基本為海進(jìn)的結(jié)構(gòu),說(shuō)明該研究區(qū)內(nèi)奧陶系除了老尖山組經(jīng)歷過(guò)完整的海水進(jìn)退過(guò)程,施甸組和蒲縹組只經(jīng)歷了奧陶紀(jì)早期海侵的擴(kuò)張,古陸邊緣淹沒(méi)的過(guò)程,至中期海侵停滯。
[Abstract]:The study area belongs to the Teties-Himalayan tectonic belt on the tectonic unit, which exists between Gondwana continent and Laoya continent. The western part of the study area is adjacent to the eastern margin of the Baoshan massif.The middle zone is the Changning melange belt of multi-island-arc basin system in the western margin of Yangtze. The Lanping Simao Foreland basin is in the east of the study area.Dynamics and plate margin orogeny and diagenesis are the most ideal places.Ordovician strata in Wandianba area are part of Baoshan-Zhenkang block on the west side of Changning-Menglian belt, and the strata are exposed continuously, which is a good carrier to study the sedimentary environment of Ordovician in this area.Based on the field investigation of five regional geological and mineral resources in Baoshan-Longling area, Yunnan Province, this paper collects and collates the relevant research data of predecessors in this research area and adjacent areas.Finally, the stratigraphic data of the Ordovician strata of Laojianshan formation, Shidian formation, Pubian formation and Renheqiao formation in this area were analyzed and studied.On the basis of previous studies, the determination of the sedimentary facies of Ordovician strata and the evolution of sedimentary environment in Wandianba area were studied.The main results are as follows: firstly, it is found that Ordovician strata in West Yunnan-Wandianba area are all clastic formations.Then through the comprehensive study on the sedimentary facies characteristics of Ordovician strata in Wandanba area, it is concluded that the Laojianshan formation is coastal facies, which is divided into upper tide belt, high tide mud flat zone and intertidal zone from top to bottom, and Shidian formation is shallow sea shelf facies, transitional zone subfacies;Pupiao formation is shallow-sea shelf facies, off-shore shelf subfacies, Renheqiao formation is platform basin facies.Comprehensive analysis of structural evolution of Ordovician the evolution of sedimentary environment: regional depression of Baoshan-Zhenkang block sedimentary Ordovician to Middle Silurian strata and post-regional uplift.The late Cambrian was mainly composed of a set of shallow-open platform silt, muddy and carbonate deposits, and sea level subsidence occurred in the late late Cambrian, and a new round of transgression began to occur in the late early Ordovician.And after the Renheqiao formation entered into the stable deposition of high water level system tract.Finally, only the Laojianshan formation is preserved in the study area, and the rest of the Shidian and Pubiao formations are basically oceanic, indicating that the Ordovician has experienced a complete process of seawater advance and retreat except the Laojianshan formation in the study area.The Shidian and Puyue formations only experienced transgression in the early Ordovician and submergence of paleocontinent margin until the middle period of transgression stagnation.
【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(lèi)號(hào)】：P512.2;P534.42

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