Depositional setting and sequence stratigraphy of Upper Mississippian coal-bearing paralic cyclothems in Upper Silesian foreland

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS International Journal of Coal Geology Pub Date : 2024-04-24 DOI:10.1016/j.coal.2024.104516
S. Opluštil , J. Laurin , J. Jureczka , W. Nadłonek , B. Naglik , J. Horák , A. Kędzior , R. Lojka , R. Nádaskay , M. Sivek
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Abstract

The upper Serpukhovian Poruba Member (c. 325–324 Ma) is a coal-bearing “paralic” succession deposited in the Upper Silesian Coal Basin located along the eastern foreland of the Moravo-Silesian segment of the Variscan fold and thrust belt. The basin formed an >150 km long, tectonically controlled embayment open to the north and northeast, with estuarine circulation, predominance of fluvial discharge and a limited tidal influence. A high-accommodation depocentre (possibly up to 1100 m/Myr) was filled by shallowing-upward successions related to the progradation of river dominated (bay-head) deltas, with subordinate fluvial and marine sediments. These strata form two orders of transgressive-regressive cycles, or genetic sequences, both overlapping with the Milankovitch band. Intervals of maximum transgression, marked by marine or brackish faunal horizons, immediately overlie coal beds, suggesting non-accretionary transgression in a low energy setting. Six medium-term genetic sequences (cyclothems) are recognized, each consisting of 4 to 6 elementary sequences and a number of smaller scale units of possible autocyclic origin. The medium-term sequences are attributed to a combined influence of relative sea-level change and changes in sediment input, both possibly as a far field response to Gondwanan glaciation through glacioeustasy and attendant changes in climatic seasonality.

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上西里西亚前陆上密西西比统含煤副旋回的沉积环境和层序地层学
上谢尔普霍夫期波鲁巴岩层(约 325-324 Ma)是沉积于上西里西亚煤盆地的含煤 "隘口 "岩层,该盆地位于瓦里斯坎褶皱和推力带莫拉沃-西里西亚地段的东部前缘。该盆地形成了一个长达 150 千米、受构造控制、向北和东北方向开放的海湾,具有河口环流特征,主要为河流排泄,受潮汐影响有限。一个高容积的沉积中心(可能高达 1100 米/百万年)由以河流为主的(湾头)三角洲逐渐变浅的上升演替所填充,下部为河流沉积物和海洋沉积物。这些地层形成了两级递变-递减循环,或称基因序列,均与米兰科维奇带重叠。以海洋或咸水动物地层为标志的最大跃进层段紧接在煤层之上,表明在低能量环境下的非排泄性跃进。六个中期基因序列(旋回)被确认,每个序列由 4 到 6 个基本序列和一些可能源自自旋的较小规模单元组成。这些中期序列是由于相对海平面变化和沉积物输入变化的综合影响造成的,两者都可能是对冈瓦纳冰川作用的远场反应,通过冰蚀作用和随之而来的气候季节性变化造成的。
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来源期刊
International Journal of Coal Geology
International Journal of Coal Geology 工程技术-地球科学综合
CiteScore
11.00
自引率
14.30%
发文量
145
审稿时长
38 days
期刊介绍: The International Journal of Coal Geology deals with fundamental and applied aspects of the geology and petrology of coal, oil/gas source rocks and shale gas resources. The journal aims to advance the exploration, exploitation and utilization of these resources, and to stimulate environmental awareness as well as advancement of engineering for effective resource management.
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