CAJ | 학술논문

臼齿构造是一种发育于中、新元古代碳酸盐岩中的具有特殊结构和时限性的沉积构造，其成因有多种解释。徐州地区新元古界贾园组风暴沉积及臼齿构造发育。本文通过野外和室内观察研究，对研究区贾园组臼齿构造形态特征及沉积环境进行分析，并探讨其形成过程。贾园组臼齿构造集中发育于古纬度20° N～34° N的潮下碳酸盐岩缓坡地带，古海洋基底在地震波作用下产生裂隙系统，元古代特殊大气成分背景下的海水中的远源风暴流渗透进入温暖的碳酸盐缓坡地带碳酸盐沉积区的裂隙系统，并在裂隙的愈合作用下与孔隙水产生化学反应产生方解石快速结晶作用，并接受后期沉积作用改造。元古代大地构造背景、古海洋、古大气的物理化学条件是控制研究区臼齿构造时空分布的主要因素。
구치구조시일충발육우중、신원고대탄산염암중적구유특수결구화시한성적침적구조，기성인유다충해석。서주지구신원고계가완조풍폭침적급구치구조발육。본문통과야외화실내관찰연구，대연구구가완조구치구조형태특정급침적배경진행분석，병탐토기형성과정。가완조구치구조집중발육우고위도20° N～34° N적조하탄산염암완파지대，고해양기저재지진파작용하산생렬극계통，원고대특수대기성분배경하적해수중적원원풍폭류삼투진입온난적탄산염완파지대탄산염침적구적렬극계통，병재렬극적유합작용하여공극수산생화학반응산생방해석쾌속결정작용，병접수후기침적작용개조。원고대대지구조배경、고해양、고대기적물이화학조건시공제연구구구치구조시공분포적주요인소。
The molar-tooth structures,a special kind of sedimentary structures with special textures and restricted time duration only developed in the Meso-to Neoproterozoic carbonate rocks are observed in the storm deposits from the Neoproterozoic Jiayuan Formation in the Xuzhou region,Jiangsu. The morphology,sedimentary environment and genesis of molar-tooth structures are treated in this study in terms of field observation and laboratory study. The molar-tooth structures in the Jiayuan Formation appear in the ramp zones of the subtidal carbonate rocks at the latitudes of 20°N to 34°N. The distal storm currents penetrated into the fissure systems produced by the earthquakes on the ancient marine basement,led to the chemical reactions with the pore-space water,and finally led to the rapid crystallization of calcite. The physical and chemical conditions of the Proterozoic oceans and atmospheres and tectonic settings are interpreted as the main factors controlling the spatio-temperal distribution of the molar-tooth structures.