意大利西北部皮埃蒙特常见和罕见的上新世下粘结有孔虫:分布、分类和古环境

IF 1.6 3区 地球科学 Q2 GEOLOGY
D. Violanti
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引用次数: 0

摘要

从古环境的角度定量分析了下上新世沉积的5个地层剖面和18个小露头的凝集有孔虫类群。研究区域位于意大利西北部的皮埃蒙特,包括蒙费拉托东北部、都灵山的南部边缘、阿斯蒂吉亚诺、阿尔伯斯和朗河的一部分。研究样品主要采集于海洋阿吉尔蓝(AA)组,覆盖了上新世地中海有孔虫带MPl1带至MPl4a亚带的时间间隔。大多数凝集组合主要由钙凝集的物种组成,这些物种呈细长的锥形或亚圆柱形,主要以Bigenerina nodosaria和Martinottiella communis为代表。上新世早期沉积于山前地区中部的深水盆地相为圆柱型clavulina rudis、Eggerella bradyi和Martinottiella perparva。这些类群的丰度逐渐减少,直至消失,在粉砂质上层演替中被以长臂草和针叶草为主的陆架类群所取代。其中,T. aciculata在可能是河流成因的沿岸下至浅水环海泥质沉积物中丰度最高,广泛分布于Astigiano地区,是浅海三角洲沉积的典型物种。本文测定的42种凝集种中,Cyclammina cancellata和Reophax scorpiurus文献报道较少,Ammobaculites agglutinans、Ammoscalaria spp.、Cribrostomoides subglobosus、Haplophragmoides canariensis、Psammosphaera spp.和Psammolingulina papillosa未见报道。这些稀有类群的出现可能代表了MPl3带特定的海底条件,其特征是局部活跃的底部环流和中营养水。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
COMMON AND RARE LOWER PLIOCENE AGGLUTINATED FORAMINIFERS OF PIEDMONT (NORTHWESTERN ITALY): DISTRIBUTION, TAXONOMY AND PALEOENVIRONMENT
Agglutinated foraminiferal taxa from five stratigraphic sections and eightheen small outcrops of Lower Pliocene deposits were quantitatively analyzed for paleoenvironmental purposes. The studied area is located in Piedmont, northwestern Italy, and includes the northeastern Monferrato, the southern margins of the Turin Hill, the Astigiano, the Albese and part of the Langhe. Studied samples were mainly collected in the marine Argille Azzurre (AA) Formation, and cover a time interval ranging from the MPl1 zone to the MPl4a subzone in the Pliocene Mediterranean Foraminiferal Zonation. Most of the agglutinated assemblages are dominated, or exclusively made, by calc-agglutinated infaunal species of elongated tapered or subcylindrical shape, mainly represented by Bigenerina nodosaria and Martinottiella communis. The deep-water infaunal Cylindroclavulina rudis, Eggerella bradyi and Martinottiella perparva characterized the open-sea basinal facies deposited in the central part of the Piedmont region during the earliest Pliocene. These taxa progressively decreased in abundance until to disappear, and were replaced in the upper silty succession by shelf taxa, dominated by Bannerella gibbosa and Textularia aciculata. In particular, T. aciculata showed its highest abundances in infralittoral to shallow circalittoral muddy sediments of probable fluvial origin, widespread in the Astigiano area, and could be suggested as a typical species of shallow marine delta deposits. Among the 42 agglutinated species here determined, Cyclammina cancellata and Reophax scorpiurus were seldom reported in previous works, Ammobaculites agglutinans, Ammoscalaria spp., Cribrostomoides subglobosus subglobosus, Haplophragmoides canariensis, Psammosphaera spp., and Psammolingulina papillosa were not previously found. The occurrence of these rare taxa could be the proxy of particular sea-floor conditions during the MPl3 zone, characterized by a locally active bottom circulation and mesotrophic waters.
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来源期刊
CiteScore
3.60
自引率
4.30%
发文量
28
审稿时长
>12 weeks
期刊介绍: The Rivista Italiana di Paleontologia e Stratigrafia was founded in 1895. It publishes original papers dealing with all fields of paleontology and of stratigraphy, from Italy and the Mediterranean to the Tethys, as well across the globe from China to North America.
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