本文選題：碳酸鹽巖 + 沉積微相　； 參考：《西北大學(xué)》2015年碩士論文

【摘要】：本文以鄂爾多斯北部巴汗淖地區(qū)奧陶系馬家溝組馬五8、7、6亞段為研究對(duì)象,在綜合前人研究成果的基礎(chǔ)上,以沉積學(xué)基本原理為指導(dǎo),結(jié)合地球物理學(xué)、地球化學(xué)等方法,通過露頭、巖心、薄片、地化等資料,明確馬五8、7、6段地層分布特征,對(duì)古地貌進(jìn)行恢復(fù)并掌握當(dāng)時(shí)海平面變化規(guī)律,通過研究目的層相標(biāo)志預(yù)判沉積相后,利用單因素分析多因素綜合法繪制單因素圖并進(jìn)行碳酸鹽巖原巖恢復(fù),綜合上述研究成果精確劃相并得出三段目的層沉積相展布特征,為后期研究提供有益參考。巴汗淖地區(qū)馬五8、7、6各亞段地層由東南向西北尖滅,厚度隨之平緩減薄,由老至新沉積區(qū)面積逐步向東南方縮小,各層厚度均穩(wěn)定在25m左右。古地貌由西北的巖溶高地過渡為中部的巖溶臺(tái)地后轉(zhuǎn)變?yōu)闁|南的巖溶斜坡,整體呈現(xiàn)西北高東南低的特征。碳氧同位素分析結(jié)果顯示由馬五8至馬五6亞段δ1.C、δ18O含量總體呈先上升后下降的趨勢(shì),反映該時(shí)期海平面先升高后降低,推測(cè)氣候由濕熱過渡為濕潤后再次轉(zhuǎn)為濕熱。三段目的層均發(fā)育大量云巖,馬五8、6亞段灰?guī)r含量較低以次生灰?guī)r為主,含少量泥質(zhì)和膏質(zhì)。馬五7亞段整體灰?guī)r含量升高,次生灰?guī)r含量降低,原生灰?guī)r含量有所增加,未見泥質(zhì)及膏質(zhì)成分。巴汗淖地區(qū)奧陶系馬家溝組馬五8亞段屬于局限海臺(tái)地相中靠近潮上的區(qū)域,隨著海平面上升馬五7亞段過渡到局限海臺(tái)地的潮上帶下部或潮間帶上部,之后海平面下降,至馬五6期回歸到局限海臺(tái)地相中靠近潮上的區(qū)域。
[Abstract]:In this paper, based on the previous research results, the Ordovician Majiagou member of Majiagou formation of the Ordovician Majiagou formation is taken as the research object. The basic principles of sedimentology are combined with geophysics, geochemistry and so on. Based on the data of outcrop, core, thin slice, geochemistry and so on, the stratigraphic distribution characteristics of the 6 member of Mawuan7jiao formation are determined, the paleogeomorphology is restored and the law of sea level change at that time is grasped, and the sedimentary facies are forecasted by studying the target facies mark. Single factor analysis and multifactor synthesis method are used to draw single factor map and recover carbonate original rock. By combining the above research results, the sedimentary facies distribution characteristics of the three target layers are obtained, which provides a useful reference for the later study. In Bahannao area, the strata of each submember of Mawuan7yao 6 are destroyed from southeast to northwest, and the thickness is gradually thinned, and the area of the old to the new sedimentary area is gradually reduced to the southeast, and the thickness of each layer is stable at about 25m. The paleogeomorphology changed from the karst highlands in the northwest to the karst terraces in the central part of the country to the karst slopes in the southeast, showing the characteristics of high, southeast and low in the northwest. The results of carbon and oxygen isotopic analysis show that 未 1. C and 未 18 O contents in the submember from Ma 58 to Ma Wu 6 generally increased first and then decreased, indicating that the sea level first rose and then decreased during this period, and it was assumed that the climate changed from humid heat to humid heat and then to humid heat again. A large amount of dolomite is developed in the three target layers, and the limestone content of the Mawuyao 6 submember is lower than that of the secondary limestone, with a small amount of muddy and gypsum. The total limestone content increased, the secondary limestone content decreased, and the primary limestone content increased, but no muddy and gypsum components were found. The Ma5.8 submember of the Ordovician Majiagou formation in the Bahannao area belongs to the area near the tide in the confined platform facies. With the rise of sea level, the Ma 57 submember is transitioning to the upper tidal belt or the upper intertidal zone of the restricted platform, and then the sea level drops. To Ma 56 stage returns to the area near the tide in the limited sea platform.
【學(xué)位授予單位】：西北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.13

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