Facies analysis in the Second Cycle Messinian evaporites predating the early Pliocene reflooding: the Balza Soletta section (Corvillo Basin, central Sicily)

IF 1 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Italian Journal of Geosciences Pub Date : 2019-10-01 DOI:10.3301/IJG.2019.06

R. Maniscalco, C. Casciano, S. Distefano, F. Grossi, A. Stefano

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引用次数: 8

Abstract

The thick evaporitic deposits cropping out widely in central Sicily are subdivided into First and Second Cycle Evaporites, separated by a regional unconformity, and are spectacularly exposed in the Balza Soletta section of the Corvillo Basin, one of the main depocenters of the Caltanissetta Basin. Here, the evaporitic succession mainly consists of Second Cycle fan-delta conglomerates and gypsarenites, onlapping the First Cycle Evaporite units.A detailed sedimentological analysis of the whole succession, coupled with the study of the microfossil content (foraminifers, calcareous nannofossils and ostracods) of selected samples representative of the different facies, indicates that the deltaic deposits of the Second Cycle record a continuous overall fining- and deepening-upward trend with a waning clastic input, likely registering a gradual reflooding. The microfossil associations (mainly ostracods and benthic foraminifers) agree with the existing data on the microfauna populating the upper Messinian Lago-Mare in Sicily before the early Pliocene reflooding, supporting the sedimentological interpretation and the hydrodynamic connection with the Paratethys.

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上新世早期洪水前第二旋回迈西尼亚蒸发岩的相分析:Balza Soletta剖面(Corvillo盆地中部)

在西西里岛中部广泛出现的厚蒸发岩矿床被细分为第一和第二旋回蒸发岩，被区域不整合分开，并在Corvillo盆地的Balza Soletta段引人注目地暴露出来，Corvillo流域是Caltanissetta盆地的主要沉积中心之一。蒸发岩序列主要由第二旋回扇三角洲砾岩和石膏岩组成，覆盖第一旋回蒸发岩单元。对整个层序的详细沉积学分析，再加上对代表不同相的选定样品的微体化石含量（有孔虫、钙质超微化石和介形虫）的研究，表明第二旋回的三角洲沉积物记录了持续的整体变细和加深的上升趋势，碎屑输入减少，很可能会出现逐渐的再膨胀。微化石组合（主要是介形虫和底栖有孔虫）与上新世早期回流前西西里岛上墨西尼亚泻湖中的微动物的现有数据一致，支持沉积学解释和与副特提斯的流体动力学联系。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Italian Journal of Geosciences GEOSCIENCES, MULTIDISCIPLINARY-

CiteScore

2.90

自引率

11.10%

发文量

审稿时长

>12 weeks

期刊介绍： The Italian Journal of Geosciences (born from the merging of the Bollettino della Società Geologica Italiana and the Bollettino del Servizio Geologico d''Italia) provides an international outlet for the publication of high-quality original research contributions in the broad field of the geosciences. It publishes research papers, special short papers, review papers, discussion-and-replies for their rapid distribution to the international geosciences community. The journal is firstly intended to call attention to the Italian territory and the adjacent areas for the exceptional role they play in the understanding of geological processes, in the development of modern geology and the Earth sciences in general. The main focus of the journal is on the geology of Italy and the surrounding sedimentary basins and landmasses, and on their relationships with the Mediterranean geology and geodynamics. Nevertheless, manuscripts on process-oriented and regional studies concerning any other area of the World are also considered for publication. Papers on structural geology, stratigraphy, sedimentology, basin analysis, paleontology, ecosystems, paleoceanography, paleoclimatology, planetary sciences, geomorphology, volcanology, mineralogy, geochemistry, petrology, geophysics, geodynamics, hydrogeology, geohazards, marine and engineering geology, modelling of geological process, history of geology, the conservation of the geological heritage, and all related applied sciences are welcome.