New Insights on the Upper Triassic Silves Group in Algarve Basin, Portugal: Palynological, paleophytogeography and paleoclimatology advances

IF 1.6 4区地球科学 Q2 PALEONTOLOGY

Geobios Pub Date : 2024-10-01 DOI:10.1016/j.geobios.2024.08.001

Margarida Vilas-Boas , Zélia Pereira , Simonetta Cirilli , Paulo Fernandes

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Abstract

This paper presents the results of palynostratigraphic studies in the Silves Group in the Algarve Basin, Portugal. From bottom to top comprises the Silves Sandstones, the Silves Marl-Carbonate Evaporitic Complex, and the Volcano-Sedimentary Series. This study aims to detail the age of the Silves Group, bracketing the Triassic-Jurassic transition, using palynology. For this purpose, 250 samples were collected from 14 main sections. Previous results from a section above the Variscan unconformity, enabled to date the base of the Silves Sandstones and the onset of the Mesozoic sedimentary cycle in the Algarve Basin to lower Carnian. In this work, the top of the Silves Sandstones, containing Camerosporites secatus, Enzonalasporites vigens, Granuloperculatipollis rudis, Lagenella martinii, Patinasporites densus, Samaropollenites speciosus, and Vallasporites ignacii, is dated to the upper Carnian. The base of the Silves Marl-Carbonate Evaporitic Complex, consisting of Alisporites sp., Araucariacites australis, Classopollis meyerianus, Classopollis torosus, Paracirculina quadruplicis and Triadispora sp., indicates an upper Carnian age. The presence of Alisporites diaphanus, Araucariacites australis, Cerebropollenites macroverrucosus, Classopollis meyerianus, Classopollis torosus, Perinopollenites elatoides, Calamospora mesozoica, and Kraeuselisporites reissingeri allows to date the top of the Silves Marl-Carbonate Evaporitic Complex as upper Rhaetian-lower Hettangian. This study allows to date the Silves Group in the Algarve Basin from the lower Carnian to lower Hettangian (Triassic-Jurassic boundary) for the first time. The Carnian microflora provides new insights of the Onslow Microflora in the Western Tethys.

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葡萄牙阿尔加维盆地上三叠统西尔韦斯组的新发现：古植物学、古地理学和古气候学的进展

本文介绍了对葡萄牙阿尔加维盆地西尔维斯组的古地层研究结果。从下到上依次为西尔维斯砂岩、西尔维斯泥灰岩-碳酸盐蒸发复合体和火山-沉积系列。这项研究旨在利用古植物学详细了解西尔维斯组的年龄，即三叠纪到侏罗纪的过渡时期。为此，研究人员从 14 个主要地段采集了 250 个样本。之前在瓦利斯坎不整合层之上的一个剖面上取得的结果，确定了西尔维斯砂岩的基底以及阿尔加维盆地中生代沉积周期开始于下卡尼安时期的时间。在这项研究中，包含 Camerosporites secatus、Enzonalasporites vigens、Granuloperculatipollis rudis、Lagenella martinii、Patinasporites densus、Samaropollenites speciosus 和 Vallasporites ignacii 的西尔维斯砂岩顶部被确定为上卡尼安时期。由 Alisporites sp.、Araucariacites australis、Classopollis meyerianus、Classopollis torosus、Paracirculina quadruplicis 和 Triadispora sp.组成的 Silves Marl-Carbonate 蒸发岩复合体的底部表明其年代为上卡诺纪。由于 Alisporites diaphanus、Araucariacites australis、Cerebropollenites macroverrucosus、Classopollis meyerianus、Classopollis torosus、Perinopollenites elatoides、Calamospora mesozoica 和 Kraeuselisporites reissingeri 的存在，可以将 Silves Marl-Carbonate Evaporitic Complex 顶部的年代定为上雷提纪-下黑炭纪。这项研究首次确定了阿尔加维盆地西尔维斯组的年代为下卡尼安至下赫坦纪（三叠纪-侏罗纪边界）。卡年纪的微生物群为西特提斯的昂斯洛微生物群提供了新的见解。

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来源期刊

Geobios 地学-古生物学

CiteScore

3.30

自引率

6.20%

发文量

审稿时长

6-12 weeks

期刊介绍： Geobios publishes bimonthly in English original peer-reviewed articles of international interest in any area of paleontology, paleobiology, paleoecology, paleobiogeography, (bio)stratigraphy and biogeochemistry. All taxonomic groups are treated, including microfossils, invertebrates, plants, vertebrates and ichnofossils. Geobios welcomes descriptive papers based on original material (e.g. large Systematic Paleontology works), as well as more analytically and/or methodologically oriented papers, provided they offer strong and significant biochronological/biostratigraphical, paleobiogeographical, paleobiological and/or phylogenetic new insights and perspectices. A high priority level is given to synchronic and/or diachronic studies based on multi- or inter-disciplinary approaches mixing various fields of Earth and Life Sciences. Works based on extant data are also considered, provided they offer significant insights into geological-time studies.