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An analogue of dominance of tectonic over climatic forcing in intermontane coal-bearing basins: Padul (SE Spain)
International Journal of Coal Geology ( IF 5.6 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.coal.2020.103530
Trinidad Torres , José E. Ortiz , Vicente Soler , Antonio Delgado , Rafael Araujo , Maruja Valle , María R. Rivas , Ramón Julià , Yolanda Sánchez-Palencia , Rogelio Vega-Panizo

Abstract A multiproxy study based on sedimentology, mineralogy, magnetic susceptibility, organic geochemistry and fossil content allowed to establish the sedimentary evolution of palustrine basins and to study the interplay between tectonic and climatic forcings in the sedimentation and facies arrangement that can be extrapolated to other coal-bearing basins. The reinterpretation of the data from 18 cores allowed to determine the facies distribution and to model the sedimentary evolution of the Padul Basin, with the longest continuous continental Quaternary record in the Southwestern Mediterranean region. The Padul Basin sediment record and facies successions provide an outstanding example of tectonically and environmentally controlled sedimentation. The sedimentary characteristics of the cores and thickness distribution revealed that recent tectonics was a more important forcing than other processes (e.g. climate). The influence of recent tectonics was determinant in facies arrangement, that is to say that the activity of a rotated fault produced a differential subsidence, causing more than 100 m of palustrine deposits to stack. On the basis of the sedimentological record combined with data on the mineralogy, fossil content, magnetic susceptibility and total organic carbon, three main sedimentary units were identified, linked to diverse subsidence rates and paleoenvironmental oscillations. The magnetic susceptibility was likely to have been controlled by the organic matter content (TOC values), linked to oxic/anoxic conditions. In the lower part of the record, Unit A (107.0–68.7 m), shallow lacustrine conditions were dominant, with an important influx associated with considerable runoff from active alluvial fans, linked to a higher subsidence rate. Unit B (68.7–37.6 m) had a transitional character, with a considerable decrease in the influence of the alluvial fan system. The lake recharge through overland flow markedly diminished and pre-existing groundwater recharge was dominant. A sudden change to peaty materials indicated that surface runoff was directly diverted to the recently excavated Durcal River gorge, thereby precluding the basin from becoming a swampy environment with stagnant waters. Unit C (upper 37.6 m) was almost exclusively fed by bicarbonate groundwater and subsurface runoff through the highly permeable coarse alluvial fan deposits. Within these main sedimentary units, minor mud-peat shallowing-upward sequences were identified.

中文翻译:

山间含煤盆地中构造对气候强迫的主导地位的类似物:Padul(西班牙东南部)

摘要 基于沉积学、矿物学、磁化率、有机地球化学和化石含量的多代理研究允许建立湖泊盆地的沉积演化,并研究沉积和相排列中构造和气候强迫之间的相互作用,可以外推到其他煤-轴承盆地。对来自 18 个岩心的数据的重新解释允许确定相分布并模拟 Padul 盆地的沉积演化,在西南地中海地区拥有最长的连续大陆第四纪记录。Padul 盆地沉积记录和相序列提供了构造和环境控制沉积的杰出例子。岩心的沉积特征和厚度分布表明,最近的构造是比其他过程(例如气候)更重要的强迫。近代构造的影响是相排列的决定性因素,也就是说,旋转断层的活动产生了差异下沉,导致超过 100 m 的沼泽沉积物堆积。在沉积学记录的基础上,结合矿物学、化石含量、磁化率和总有机碳数据,确定了三个主要沉积单元,与不同的沉降速率和古环境振荡有关。磁化率可能受有机质含量(TOC 值)控制,与有氧/缺氧条件有关。在记录的下部,A 单元(107.0-68.7 m),浅湖条件占主导地位,大量涌入与活跃冲积扇的大量径流有关,与较高的沉降率有关。B 单元(68.7~37.6 m)具有过渡性,冲积扇系统的影响明显减弱。通过地表水流补给的湖泊显着减少,而预先存在的地下水补给占主导地位。泥炭物质的突然变化表明地表径流被直接转移到最近挖掘的杜尔卡河峡谷,从而避免了该盆地成为具有停滞水域的沼泽环境。单元 C(上部 37.6 m)几乎完全由碳酸氢盐地下水和地下径流通过高渗透性粗冲积扇沉积物供给。在这些主要沉积单元中,
更新日期:2020-07-01
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