【摘要】：徐州地區(qū)新元古界中下部賈園組—倪園組在銅山區(qū)趙圩村寨山剖面出露完整連續(xù),巖性組合極具代表性,沉積現(xiàn)象豐富,疊層石發(fā)育,具大量典型的事件沉積。依據巖性特征對三組間的巖石地層界限進行了討論。在趙圩組鑒定出8個疊層石屬,與淮南、吉遼地區(qū)具有相似的組合類型和演化規(guī)律。徐淮地區(qū)新元古界使用同一個地層柱狀系統(tǒng),最新的Sr、C同位素年齡和鋯石U-Pb測年數(shù)據表明,其沉積時限應在1000-800Ma左右。疊層石和同位素年齡的對比印證了前人對吉遼徐淮地區(qū)屬同一海盆沉積的認識。結合最新的同位素測年資料、疊層石衰減事件和新元古代冰期事件,將該套地層統(tǒng)一置于青白口系。依據巖性組合特征將賈園組分為4段,趙圩組分2段,倪園組分3段。結合巖石學特征及沉積相標志進行了沉積相的劃分,賈園組—倪園經歷了一個總體上由淺變深、再由深變淺的過程,其沉積環(huán)境演化順序依次為:濱岸緩坡—臺地邊緣灘—淺緩坡—臺地邊緣生物礁—淺緩坡—中緩坡—深水斜坡—局限臺地—蒸發(fā)臺地—局限臺地—蒸發(fā)臺地。事件沉積包括地震沉積和風暴沉積兩個方面。重點討論了地震沉積中臼齒構造的形態(tài)、排列組合、賦存特征及板刺礫巖的形成過程。區(qū)分出4種類型的風暴沉積序列,其在垂向上的分布特征反映不同的水動力條件和古地理位置。討論了臼齒構造與風暴沉積之間的關系,建立了事件綜合沉積模式,在此基礎上對臼齒構造的成因進行了分析。新元古代是超大陸聚合與裂解、低緯度冰川發(fā)育的特殊歷史時期。Rodinia超級大陸復原圖和古地磁數(shù)據表明,華北板塊在1000-700Ma期間一直處于北半球的中低緯度地區(qū)。低緯度、Sturtian冰期前的濕熱氣候、特殊的海水條件是吉遼徐淮地區(qū)巨厚碳酸鹽巖建造形成的原因。古地理位置決定了風暴沉積發(fā)育的特征,巖漿活動引起的全球構造運動誘發(fā)了頻繁的地震沉積。地震引發(fā)的海洋風暴潮造成了臼齒構造和風暴沉積共生的現(xiàn)象。
[Abstract]:In Xuzhou area, the Jiayuan formation and Niyuan formation in the middle and lower part of the Neoproterozoic appear intact and continuous in Zhaowei village mountain section in Tongshan area, the lithologic assemblages are very representative, the sedimentary phenomena are abundant, stromatolites are developed, and there are a large number of typical event deposits. The lithostratigraphic boundary between the three groups is discussed according to the lithologic characteristics. Eight stromatolites have been identified in Zhaowei formation with similar assemblage types and evolution laws as those in Huainan and Jiliao regions. The Neoproterozoic in Xuhuai area uses the same stratigraphic columnar system. The latest Sr,C isotopic age and zircon U-Pb dating data indicate that the sedimentary time limit should be about 1000-800Ma. The comparison of stromatolites and isotopic ages confirms the previous understanding of the same basin deposits in the Jiliao Xuhuai area. Combined with the latest isotopic dating data, stromatolite attenuation events and Neoproterozoic glacial events, the strata were unified in Qingbaikou system. According to the characteristics of lithologic assemblage, the Jiayuan formation is divided into 4 sections, 2 sections of Zhao Wei component and 3 stages of Ni Yuan component. Combined with the petrological characteristics and sedimentary facies marks, the sedimentary facies were divided. Jiayuan formation-Ni Yuan experienced a process from shallow to deep and then from deep to shallow on the whole. The sequence of sedimentary environment evolution is as follows: shoreline gentle slope, platform edge beach, shallow gentle slope, platform edge biological reef, shallow gentle slope, medium gentle slope, deep water slope, limited platform and evaporation platform. Event deposition includes seismic deposition and storm deposition. The shape, arrangement and combination of molars, their occurrence characteristics and the formation process of bentonite are discussed in detail. Four types of storm deposition sequences are distinguished and their vertical distribution reflects different hydrodynamic conditions and paleogeographic locations. The relationship between molar structure and storm deposition is discussed, and the event integrated sedimentary model is established. On this basis, the origin of molar structure is analyzed. The Neoproterozoic is a special historical period of supercontinent aggregation and fragmentation and glacier development at low latitudes. The Rodinia supercontinent restoration map and paleomagnetic data indicate that the North China plate has been in the middle and low latitudes of the Northern Hemisphere during the 1000-700Ma period. The formation of super-thick carbonate rocks in the area of Jiliaoxuhuai area is due to the low latitude, the humid and thermal climate before the Sturtian ice age and the special sea water conditions. Paleogeographic location determines the characteristics of storm deposition, and the global tectonic movement induced by magmatic activity induces frequent seismic deposition. The ocean storm surge caused by the earthquake caused a symbiosis of molars and storm deposits.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P534.3

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