CAJ | 학술논문

鄂尔多斯盆地奥陶系为广泛的陆表海碳酸盐岩沉积，其东部马家沟组岩相特征、岩石组合类型和旋回性丰富多样。通过对本区临汾晋王坟剖面的奥陶系马家沟组地层进行精细测量，笔者从剖面的沉积特征入手，进行沉积环境和沉积微相的分析，并以沉积微相的纵向演变规律为基础，结合准层序向上变浅的本质特征，识别划分野外露头剖面的准层序。研究区马家沟组共识别出32个准层序，可分为两种类型：准层序类型Ⅰ跨越若干微环境，相变向上为浅；准层序类型Ⅱ沉积于同一个微环境，向上有层厚的渐变趋势。两种类型准层序的形成取决于沉积物供给、短周期海平面升降和地层沉降三者之间的关系和相互作用。研究区内的准层序类型Ⅰ发育广泛，较为常见，类型Ⅱ则发育较少。
악이다사분지오도계위엄범적륙표해탄산염암침적，기동부마가구조암상특정、암석조합류형화선회성봉부다양。통과대본구림분진왕분부면적오도계마가구조지층진행정세측량，필자종부면적침적특정입수，진행침적배경화침적미상적분석，병이침적미상적종향연변규률위기출，결합준층서향상변천적본질특정，식별화분야외로두부면적준층서。연구구마가구조공식별출32개준층서，가분위량충류형：준층서류형Ⅰ과월약간미배경，상변향상위천；준층서류형Ⅱ침적우동일개미배경，향상유층후적점변추세。량충류형준층서적형성취결우침적물공급、단주기해평면승강화지층침강삼자지간적관계화상호작용。연구구내적준층서류형Ⅰ발육엄범，교위상견，류형Ⅱ칙발육교소。
On the basis of the precise measurement of the Ordovician Majiagou Formation strata and sedimentary microfacies analysis of the Jinwangfen section in Linfen, eastern Ordos Basin, 32 parasequences have been discriminated for the Majiagou Formation, and may be classified into the following two categories. The parasequence I spanning a number of micro-environments displays the shallowing-upward facies transition whereas the parasequence II deposited in a single micro-environment displays a thickening-upward trend of the sequences. The former is wide-spread while the latter is seldom in the study area. The formation of the above-mentioned types of parasequences tends to depend on the relationship and interaction of sediment supply, short-term sea-level fluctuations and stratigraphic subsidence.