CAJ | 학술논문

徐州地区新元古界赵圩组地层在赵圩村出露良好，整体为一套碳酸盐岩沉积，岩性组合可划分为4段：鲕粒灰岩段、风暴事件沉积段、叠层石段和白云岩段，其中叠层石段又划分为A和B两个单元。剖面内部发育大量风暴沉积记录，并与正常沉积在垂向上互层叠置，整体具有向上频率变弱、规模变小的趋势。典型的风暴沉积标志包括丘状交错层理、粒序层理、冲刷-充填构造、冲刷切削构造、砾屑灰岩层、生物礁丘截切现象等。文中划分出4种风暴沉积序列类型，说明每种序列类型指示的古地理和古环境意义，以及在剖面上的分布组合特征。依据剖面岩性与风暴沉积的分布组合规律，认为赵圩组由下至上构成一个总体向上变深，而后又变浅的沉积序列，沉积环境演化依次为浅滩-近岸浅水潮下带-碳酸盐岩开阔台地-碳酸盐岩局限台地-深水斜坡-潮坪、泻湖，气候总体炎热干旱。风暴频发可能与沉积期本区所处的较低的古纬度有关。
서주지구신원고계조우조지층재조우촌출로량호，정체위일투탄산염암침적，암성조합가화분위4단：이립회암단、풍폭사건침적단、첩층석단화백운암단，기중첩층석단우화분위A화B량개단원。부면내부발육대량풍폭침적기록，병여정상침적재수향상호층첩치，정체구유향상빈솔변약、규모변소적추세。전형적풍폭침적표지포괄구상교착층리、립서층리、충쇄-충전구조、충쇄절삭구조、력설회암층、생물초구절절현상등。문중화분출4충풍폭침적서렬류형，설명매충서렬류형지시적고지리화고배경의의，이급재부면상적분포조합특정。의거부면암성여풍폭침적적분포조합규률，인위조우조유하지상구성일개총체향상변심，이후우변천적침적서렬，침적배경연화의차위천탄-근안천수조하대-탄산염암개활태지-탄산염암국한태지-심수사파-조평、사호，기후총체염열간한。풍폭빈발가능여침적기본구소처적교저적고위도유관。
The Neoproterozoic Zhaowei Formation in Xuzhou consists of 4 units, i.e., oolitic unit, tempestite unit,stromatolitic unit and dolomite unit. The stromatolitic unit was subdivided into A and B parts. The tempestites, which abate from early to later stages, alternate with non-tempestites in the vertical section. Some typical sedimentary symbols of tempestite sediments were developed in this zone such as hummocky cross stratification(HCS), flush-filling structure, cut structure, organic reef-cutting structures, calcrudites, graded bed and so on. Four kinds of tempestites sequences were summarized according to the vertical sequence types, structures and sediment characteristics. The distribution of tempestites was also summarized. The discovery of tempestites is helpful to interpret the sedimentary environment. According to the distribution of tempestites and the lithologic characteristics, the authors suggest that the sedimentary environments the Zhaowei Formation were successively shoals-landward shallow subtidal zone-open carbonate platform-restricted carbonate platform-tidal flat or lagoon and the climate during the deposition was warm and arid. Frequent storms occurred due to the relatively low palaeolatitude during the deposition.