MIDDLE EOCENE IN THE ALPINE RETROFORELAND BASIN (NORTHERN ITALY): SEDIMENTARY RECORD OF A “MESO-ALPINE” ARC-TRENCH SYSTEM IN THE ALPS

IF 1.6 3区 地球科学 Q2 GEOLOGY Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2023-03-30 DOI:10.54103/2039-4942/18626
D. Sciunnach, F. Tremolada, I. Premoli Silva, G. Scardia
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Abstract

The middle Eocene Cibrone Formation of Brianza (central-western Lombardy) represents an important stratigraphic record to understand a key step of the tectonic evolution of the Alpine range poorly recorded elsewhere. Quantitative petrographic analysis of turbidite arenites, well-constrained in age by the biostratigraphy of interlayered marlstones based on calcareous foraminifera and nannoplankton, allowed us to identify a possible vertical compositional trend within the Cibrone Fm. and to document the NP17 nannofossil Zone (Bartonian) in central Lombardy exposures, east of the Ternate Formation outcrop area. Variable arenite compositions are interpreted to reflect contributions from different source areas, i.e., recycled orogen, island arc, and starved continental shelf. In a paleogeographic scenario still open to different interpretations, the proposed reconstruction supports a classical plate tectonics model for arc-trench systems. The stratigraphic gap, recorded everywhere in Lombardy, between the Eocene succession and the base of the Gonfolite Lombarda Group (upper NP24 nannofossil Zone, early Chattian), corresponds to the earliest stage of continental collision, uplift and erosion that climaxed in the Neo-Alpine Phase.
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阿尔卑斯后前陆盆地(意大利北部)始新世中期:阿尔卑斯山脉中阿尔卑斯弧-天系统的沉积记录
布里安扎(伦巴第中西部)中始新世震波组为了解其他地区记录较差的阿尔卑斯山脉构造演化的关键阶段提供了重要的地层记录。浊积砂粒岩的定量岩石学分析,以及基于钙质有孔虫和纳米浮游生物的层间泥灰岩的生物地层学对其年龄的良好约束,使我们能够确定该区可能的垂直组成趋势。并记录了伦巴第中部暴露的NP17纳米化石带(巴顿型),位于Ternate组露头区以东。不同的砂质岩组成被解释为反映了不同源区的贡献,即再生造山带、岛弧和饥饿的大陆架。在一个仍有不同解释的古地理场景中,所提出的重建支持了弧-海沟体系的经典板块构造模型。伦巴第地区始新世演替与Gonfolite Lombarda群基底(早Chattian NP24纳米化石带上部)之间的地层缺口,与新阿尔卑斯期达到高潮的大陆碰撞、隆升和侵蚀的最早阶段相对应。
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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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