A palynological investigation of the Early-Middle Devonian transition and associated Choteč Event in Northern Spain

IF 1.7 3区 地球科学 Q2 PALEONTOLOGY Review of Palaeobotany and Palynology Pub Date : 2024-10-22 DOI:10.1016/j.revpalbo.2024.105222
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Abstract

In Northern Spain there is a near complete sequence of Devonian rocks that accumulated around a relatively isolated land mass, the Armorican Terrane Assemblage, which was separated from Gondwana to the south and Laurussia to the north. The Lower to Middle Devonian transition records a dramatic facies change from carbonate to siliciclastic sedimentation. The Choteč Event, a global anoxic pulse that occurs just above the Lower-Middle Devonian boundary (392.5–393.1 Ma), has been identified within this transition. These strata are included in the Moniello and Naranco fms in Asturias and the equivalent Santa Lucía and Huergas fms in Leon. They are independently age-contrained based on conodont and invertebrate biotas. For the first time we describe palynomorph assemblages recovered from the Lower to Middle Devonian transition in Northern Spain. The assemblages contain terrestrial (spores) and marine (acritarchs, prasinophycean cysts, chitinozoans) elements, thus recording primary productivity on both the land and in the oceans. The older assemblages belong to the annulatus–sextantii Spore Zone and the younger assemblages the douglastownensis–eurypterota Spore Zone, which is concordant with the independent age constraints. Our analysis of the distribution and diversity of marine and terrestrial palynomorphs supports interpretations of the facies change associated with the Choteč Event as being related to a change to increased rainfall and terrestrial runoff. However, this change is associated with only limited taxon turnover in both land plant spores and marine phytoplankton and chitinozoans.
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西班牙北部早泥盆世-中泥盆世过渡及相关乔特奇事件的古植物学调查
在西班牙北部,有一个近乎完整的泥盆纪岩石序列,它是在一个相对孤立的陆块--阿莫里卡地层集合体(Armorican Terrane Assemblage)--周围堆积而成的,该陆块南面与冈瓦纳大陆分离,北面与劳鲁西亚大陆分离。下泥盆纪向中泥盆纪的过渡记录了从碳酸盐沉积到硅质沉积的巨大变化。乔特奇事件(Choteč Event)是发生在下泥盆世至中泥盆世边界(392.5-393.1Ma)上方的一个全球性缺氧脉冲,已在这一过渡时期被确认。这些地层包括在阿斯图里亚斯的莫尼耶洛地层和纳兰科地层以及莱昂的圣卢西亚地层和韦尔加斯地层中。根据针齿类和无脊椎动物的生物群,这些地层具有独立的年代控制。我们首次描述了从西班牙北部下泥盆世向中泥盆世过渡时期采集到的古生物组合。这些组合包含陆生(孢子)和海生(棘皮动物、原生孢囊、壳软体动物)元素,从而记录了陆地和海洋的初级生产力。较老的集合体属于annulatus-sextantii孢子区,较年轻的集合体属于douglastownensis-eurypterota孢子区,这与独立的年龄限制是一致的。我们对海洋和陆地古生物的分布和多样性的分析支持了与乔特奇事件相关的面貌变化的解释,即与降雨量和陆地径流增加有关。然而,这种变化只与陆地植物孢子和海洋浮游植物及壳软体动物的有限分类群更替有关。
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来源期刊
CiteScore
3.50
自引率
21.10%
发文量
149
审稿时长
6 months
期刊介绍: The Review of Palaeobotany and Palynology is an international journal for articles in all fields of palaeobotany and palynology dealing with all groups, ranging from marine palynomorphs to higher land plants. Original contributions and comprehensive review papers should appeal to an international audience. Typical topics include but are not restricted to systematics, evolution, palaeobiology, palaeoecology, biostratigraphy, biochronology, palaeoclimatology, paleogeography, taphonomy, palaeoenvironmental reconstructions, vegetation history, and practical applications of palaeobotany and palynology, e.g. in coal and petroleum geology and archaeology. The journal especially encourages the publication of articles in which palaeobotany and palynology are applied for solving fundamental geological and biological problems as well as innovative and interdisciplinary approaches.
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