鄂尔多斯盆地保德地区太原组桥头砂岩沉积特征及成因

对于山西保德地区桥头砂岩的成因，一直存在不同认识。在野外剖面实测及室内资料分析的基础上，结合对砂岩的岩石学特征、垂直层序、沉积构造、古流向特征及砂岩体空间展布规律等方面资料，研究了保德地区太原组桥头砂岩的沉积特征，认为该地区桥头砂岩为太原期早期的庙沟期海侵之后、相对海平面下降时期的辫状河沉积，其沉积特征明显受古构造背景、差异沉降、沉积物供给及海平面升降等因素控制。

SEDIMENTARY CHARACTERS AND ORIGIN OF QIAOTOU SANDSTONE IN THE TAIYUAN FORMATION, BAODE AREA OF ORDOS BASIN

Some different viewpoints on the origins of the Qiaotou sandstone in the Baode city of Shanxi Province. Based on measuring the out section, the analysis of inner data, the petrologic character, lithologic association, sedimentary structure, palaeourrent directions, and distribution of sandstone, the sedimentary characters of the Qiaotou sandstone in the Taiyuan formation in Baode area is studied systematically. The sedimentary environment of the Qiaotou sandstone is the transition deposit of braided river during the lowstand period, after the Miaogou transgressior~ of the early Taiyuan period. The sedimentary characters of the Qiaotou sandstone are controlled by early tectonic backgrand, dissimilarity of structural change,sediments supply and eustatism.