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首页> 外文期刊>Palaeogeography, Palaeoclimatology, Palaeoecology: An International Journal for the Geo-Sciences >Late Triassic and Early Jurassic palaeogeographic evolution and depositional cycles of the Western Tethys Iberian platform system (Eastern spain)
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Late Triassic and Early Jurassic palaeogeographic evolution and depositional cycles of the Western Tethys Iberian platform system (Eastern spain)

机译:西特提斯伊比利亚平台系统(东西班牙)晚三叠世和侏罗纪早期古地理演化和沉积周期

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摘要

Deposition of Upper Triassic and Lower Jurassic sediments on the Iberian platform system took place in a post-rift intraplate basin which formed part of the western Tethys shelf Nevertheless, there is evidence for the tensional reactivation of a network of faults with associated magmatic activity. Early Jurassic palaeogeographic reconstructions, based on over 70 sections and 9 oil wells, reveal the presence of a series of highs and lows (depocentres). Two main highs, referred to as the El Maestrazgo High, in the east, and the La Mancha High, in the west, where condensed sections were deposited, were mainly controlled by syndepositional faults. The main depocentres were situated between these two highs areas, in a northwest trending belt in the central, northern and southern areas. Despite partial fault control, development of some Early Jurassic depocentres appears to be mainly controlled by thermal contraction of the lithosphere following Triassic main rifting pulse. The Upper Triassic-Lower Jurassic succession of the Iberian platform system was deposited during four transgressive and regressive cycles of 12 to 6 My duration. The lowermost cycle LJ-1 started in late Norian and lasted until the Sinemurian. The second cycle LJ-2 started in the Sinemurian and ended in the Pliensbachian (Davoei Zone), and can be subdivided into two minor cycles LJ2-1 and LJ2-2. The cycle LJ-3 started with an extensive upper Pliensbachian (Davoei Zone) transgression, whereas the top of its regressive cycle is dated to the Toarcian (Variablilis Zone). Within cycle LJ-3, three cycles can be distinguished. Maximum deepening was reached during the Biftons Zone and active volcanism took place along the Teruel and Caudiel faults. The transgressive phase of the cycle LJ-4 started in the Thouarsense Zone and extended up to the Insigne Zone; its regressive phase developed during the upper Toarcian (Pseudoradiosa and Aalensis Zones) and part of the Aalenian (Opalinum and Murchisonae Zones). This cycle can be subdivided in two minor cycles, with their transgressive peaks occurring during the Insigne Zone, and the Aalensis Zone respectively. Palaeogeographically this corresponds with the expansion of the marginal carbonate platforms over hemipelagic deposits. The top of the cycle corresponds to a major unconformity with regional emersion during the Aalenian Murchisonae Zone. (c) 2005 Elsevier B.V. All rights reserved.
机译:伊比利亚台地系统上三叠纪和下侏罗统沉积物的沉积发生在裂陷后板内盆地中,该盆地是特提斯大陆架西部的一部分。尽管如此,有证据表明,与相关岩浆活动有关的断层网络会重新张紧。早期的侏罗纪古地理重建以70多个断面和9口油井为基础,揭示出一系列高点和低点(沉积中心)的存在。东部有两个主要的高点,分别称为El Maestrazgo高地和西部,有凝结断面的La Mancha高地,主要受同沉积断层控制。主要的震中位于这两个高地之间,位于中部,北部和南部地区的西北趋势带中。尽管有部分断层控制,某些早侏罗世沉积中心的发育似乎主要受三叠纪主裂谷脉冲作用后岩石圈的热收缩控制。伊比利亚平台系统的上三叠纪-下侏罗统演替是在12到6 My持续时间的四个海侵和海退周期中沉积的。最低的周期LJ-1从Norian晚期开始,一直持续到Sinemurian。第二个周期LJ-2从Sinemurian开始,在Pliensbachian(达沃伊地区)结束,可以细分为两个较小的周期LJ2-1和LJ2-2。 LJ-3周期始于广泛的上Pliensbachian(达沃伊带)海侵,而其回归周期的顶部可追溯到Toarcian(Variablilis带)。在循环LJ-3中,可以区分三个循环。在比夫顿地区达到了最大程度的加深,沿着特鲁埃尔和卡迪埃尔断裂带发生了活跃的火山作用。 LJ-4周期的海侵阶段始于Thouarsense区,一直延伸至Insigne区。其退缩阶段在上层Toarcian(Pseudoradiosa和Aalensis带)和部分Aalenian(Opalinum和Murchisonae带)形成。这个周期可以细分为两个较小的周期,它们的海侵峰分别出现在Insigne区和Aalensis区。在古地理上,这对应于半碳酸盐沉积物上边缘碳酸盐岩台地的扩张。周期的顶部对应于阿里尼亚Murchisonae地区与区域出现的一次不整合。 (c)2005 Elsevier B.V.保留所有权利。

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