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首页> 外文期刊>Sedimentology: Journal of the International Association of Sedimentologists >Dynamic stratigraphy of composite peripheral unconformity in a foredeep basin
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Dynamic stratigraphy of composite peripheral unconformity in a foredeep basin

机译：前深盆地复合周边不整合面的动态地层学

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This study employs facies analysis and basic principles of sequence stratigraphy to correlate isolated outcrop sections and reveal the depositional history of the Chmielnik Formation - a prominent mid-Serravalian clastic wedge formed on the basinward forebulge flank of the Polish Carpathian Foredeep. The coarse-grained clastic wedge, up to 30 m thick and spanning ca 1.1 Ma within biozone NN6, consists of fluvio-deltaic, foreshore and shoreface deposits with a range of large littoral sand bars, all enveloped in muddy offshore-transition deposits. Its dynamic stratigraphy indicates rapid shoreline shifts and environmental changes due to the interplay of forebulge tectonism, sediment supply and third-order eustatic cycles. A similar interplay of tectonism and eustasy is recognizable in the whole middle Miocene sedimentary succession deposited on the forebulge flank, demonstrating an extreme case of an accommodation-controlled shelf and indicating tectonic cycles of the forebulge uplift and subsidence spanning ca 800 to 900 ka. The episodes of forebulge uplift correlate with the main pulses of orogen thrusting. The resulting composite peripheral unconformity differs markedly from the idealized model of a 'steady-state' stepwise onlap driven by forebulge continuous retreat. It is concluded that the foredeep peripheral unconformities, instead of being simplified in accordance with this idealized model, should rather be studied in detail because they bear a valuable high-resolution record of regional events and give unique insights into the local role of tectonics, eustasy and sediment supply.
机译：这项研究利用相分析和层序地层学的基本原理来关联孤立的露头剖面，并揭示了Chmielnik组的沉积历史-Chmielnik组-一个明显的中塞拉瓦期碎屑楔形物，形成于波兰喀尔巴阡山脉Foredeep盆地向前隆起的侧面。粗粒碎屑楔形物厚达30 m，在生物区NN6内跨度约1.1 Ma，由潮河三角洲，前滨和岸面沉积物以及一系列大型滨海沙洲组成，全部包裹在泥泞的近海过渡沉积物中。它的动态地层表明，由于前陆构造，沉积物供应和三阶欣快循环之间的相互作用，海岸线迅速发生变化，环境发生了变化。在沉积在前陆侧面的整个中新世中部沉积演替过程中，也可以看到类似的构造作用和摇摇欲坠的相互作用，这表明了一个极端的情况，即一个由住宿控制的架子，并表明了前陆隆起和沉降的构造周期跨越了大约800至900 ka。前隆起的发作与造山带逆冲的主要脉动有关。由此产生的复合材料周边不整合与由前馈连续后退驱动的“稳态”逐步重叠的理想模型有显着差异。结论是，前瞻性周边不整合，而不是按照这种理想化的模型进行简化，而应该进行详细研究，因为它们具有有价值的高分辨率区域事件记录，并且对构造，摇晃的局部作用具有独特见解和沉积物供应。

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