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首页> 外文期刊>Facies >Record of very high energy events in Plio-Pleistocene marine deposits of the Gulf of Cadiz (SW Spain): facies and processes
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Record of very high energy events in Plio-Pleistocene marine deposits of the Gulf of Cadiz (SW Spain): facies and processes

机译：加的斯湾（西班牙西南）的上新世更新世海相沉积中极高能级事件的记录：相和过程

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The depositional conditions that characterized the sedimentary filling in the southern sector of the Guadalquivir Basin during the late post-orogenic Neogene have been established through the sedimentological study of the Plio-Pleistocene outcrops along the Cadiz coast (SW Spain). The study has contributed to a better interpretation of the regional stratigraphy and helped to establish both depositional mechanisms and processes. Deposits show different lithofacies according to the dominant climatic and prevailing environmental conditions. Pliocene deposits show bioclastic lithofacies with abundant warm-water fossils, whereas Pleistocene sediments have a low fossil content. Stratigraphic sections indicate important depositional changes: sandstone and grainstone were deposited under a seasonal regime, whereas accumulations of large boulders and bioclasts are interpreted as event deposits, the product of episodic oceanographic processes, such as huge storms or tsunamis. These deposits do not have a seasonal character; however, given their relative frequency in the stratigraphic sections, they were probably associated with neo-tectonic activity in the Guadalquivir Foreland Basin, which was an important controlling factor in this basin. The proximity to the Africa-Eurasia plate boundary together with several historically documented earthquakes and tsunamis in the study area, suggest that these processes could explain the origin of these deposits. The seismic-tectonic activity was more intense between the late Pliocene and early Pleistocene, as shown by the presence of a well-marked angular unconformity, as well as by a higher frequency of the very high energy clastic and bioclastic accumulations.
机译：通过在加的斯海岸（西班牙西南）的上新世新世露头的沉积学研究，已经确定了晚造山后新近纪晚期瓜达尔基维尔盆地南部地区沉积物充填的沉积条件。该研究有助于更好地解释区域地层，并有助于建立沉积机制和沉积过程。根据主要的气候和主要环境条件，矿床显示出不同的岩相。上新世沉积物显示具有丰富的温水化石的生物碎屑岩相，而更新世沉积物的化石含量低。地层剖面表明了重要的沉积变化：砂岩和颗粒岩是在季节性条件下沉积的，而大块巨石和生物碎屑的堆积被解释为事件沉积，这是偶发性海洋学过程的产物，例如巨大的风暴或海啸。这些矿床没有季节性特征；但是，考虑到它们在地层剖面中的相对频率，它们可能与瓜达尔基维尔前陆盆地的新构造活动有关，这是该盆地的重要控制因素。靠近非洲-欧亚大陆板块边界以及研究区域的几次历史记载的地震和海啸表明，这些过程可以解释这些矿床的成因。上新世晚期与更新世之间的地震构造活动更为强烈，这表现为明显的角度不整合，以及较高频率的高能碎屑和生物碎屑堆积的出现。

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