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首页> 外文期刊>Facies >Meter-scale cycles as a proxy for the evolution of the Apulian Carbonate Platform during the late Cretaceous (Llogara Pass, Albania)
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Meter-scale cycles as a proxy for the evolution of the Apulian Carbonate Platform during the late Cretaceous (Llogara Pass, Albania)

机译：米级周期作为白垩纪晚期（阿尔巴尼亚洛加拉山口）阿普利亚碳酸盐岩平台演化的代名词

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摘要

Sedimentological investigations have revealed ten facies in Upper Cretaceous platform carbonates (1220 m thick) at Llogara Pass in southern Albania that can be grouped into four facies associations. These reflect specific environmental conditions, ranging from intertidal to subtidal. The facies form small-scale patterns attesting to high-frequency/low-amplitude cyclicity characteristic of relative sea-level fluctuations. Meter-scale cycles have been classified into six distinct types and characterized on the basis of diagnostic surfaces, diagenetic features, and reservoir properties. A closer look at diagenetic and petrophysical features revealed a drastic porosity reduction at each cycle top (i. e., cycle boundary). This underlines a strong interconnection of facies types and reservoir properties at the cycle scale, thus impacting the whole carbonate succession. The cycle stacking pattern is a reflection of the sedimentary evolution during the late Cretaceous in this southern part of the Apulian Platform. (1) Meter-scale peritidal cycles suggest that the Cenomanian was characterized by stable shallow-water conditions. (2) Thick stromatolitic-dominated cycles typify Turonian deposits. Although the nature of the deposits indicates inner platform conditions, the long-term hiatus documented from Italy (Turonian bauxites) is not evidenced in Llogara. (3) The thin (a few tens of meters) Coniacian-Santonian interval suggests the onset of a significant tectonic control over the sedimentary dynamics, likely accompanied by morphological changes on the Apulian Platform and an emergence of rudist-dominated cycles. (4) Peritidal-subtidal cycles persist during the Campanian, accompanied by a broad development of rudist organisms that evidence significant and repeated relative sea-level rise. These data allow refinement of the general sedimentological evolution during the late Cretaceous on the Apulian Platform.
机译：沉积学调查显示，阿尔巴尼亚南部Llogara Pass的上白垩统台地碳酸盐岩（厚1220 m）有10个相，可以分为4个相组。这些反映了特定的环境条件，从潮间带到潮间带。这些相形成了小规模的模式，证明了相对海平面波动的高频/低振幅周期性特征。仪表级循环已分为六种不同的类型，并根据诊断面，成岩特征和储层性质进行了表征。仔细观察成岩作用和岩石物理特征，发现每个循环顶部（即循环边界）的孔隙率都大大降低。这强调了相规模和储集层性质在循环规模上的强烈联系，从而影响了整个碳酸盐岩的演替。循环堆积模式反映了阿普利亚平台南部这个白垩纪晚期的沉积演化。 （1）米尺度的围生期周期表明，塞诺曼期具有稳定的浅水条件。 （2）厚层岩质为主的旋回代表了Turonian矿床。尽管沉积物的性质表明平台内部条件，但在洛格加拉（Llogara）没有证据表明意大利（土工铝土矿）的长期裂隙。 （3）较薄的（几十米）柯尼西亚－桑托尼间隔表明对沉积动力学的明显构造控制开始，可能伴随着阿普利亚台地的形态变化和以鲁斯蒂斯为主导的旋回的出现。 （4）坎潘期的潮汐-潮下周期持续存在，同时伴随着大量的红树林生物的发展，这表明海平面出现了明显且反复的相对升高。这些数据可以细化白垩纪晚期在阿普利亚平台上的总体沉积演化。

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