颠倒:阿根廷西北部马斯特里赫特-二迭纪亚科拉特岩层翻转叠层石的恢复力与重新定居

IF 1.9 3区 地球科学 Q1 GEOLOGY
Gabriel Ricardo López Isla , Patricio Guillermo Villafañe , Lucas Quiroga , Julia Jimeno-Alda , Paolo Citton , Silvina de Valais , Carlos Alfredo Cónsole-Gonella , Ignacio Díaz-Martínez
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引用次数: 0

摘要

叠层石是一种有机沉积结构,内部层叠,附着在基质上生长。这种层理反映了其形成过程中环境和生物因素的动态相互作用。然而,阿根廷西北部安布拉约(Amblayo)地区亚科拉特岩层(Yacoraite Formation)中的一些叠层石呈现出一种非常规的内部结构,其特点是双边对称,层理的发展向一个假想平面的两侧延伸。研究结果表明,这些叠层石是在光度良好、有大量沉积物输入的浅潮间带环境中,通过原位生物诱导碳酸盐沉淀而形成的微生物生长。然而,叠层生长分为两个阶段,中间被随机事件打断,随机事件导致结构倾覆,为微生物生长提供了新的定植面,并形成了双边内部结构。对包括结构倾覆在内的这些阶段的描述,不仅为重建亚科拉特地层的定时环境条件提供了一个高度精确的替代物,而且还开辟了一个讨论领域,重点关注产生叠层石的微生物在随机事件后的恢复能力和重新定殖能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Upside down: Resilience and recolonization of overturned stromatolite from the Maastrichtian-Danian Yacoraite formation (northwestern Argentina)

Stromatolites are organo-sedimentary structures, internally laminated, which grow attached to the substrate. This lamination mirrors the dynamic interaction of environmental and biological factors where its formation takes place. However, some stromatolites from the Yacoraite Formation, from Amblayo locality, in northwestern Argentina, present an unconventional internal structure characterized by bilateral symmetry, where the development of lamination extends towards both sides of an imaginary plane.

This contribution reports a multi-scale analysis of these particular stromatolites, with the aim of determining the extent to which environmental factors have influenced their internal structure. In addition to this, a sequence of stages that gave rise to these organo-sedimentary structures will be proposed.

Results suggest a microbialitic growth by in-situ biologically induced, carbonate precipitation, which was carried out in a shallow intertidal environment with good luminosity and significant sedimentary input. However, the stromatolitic growth occurred over two stages, interrupted by a stochastic event that generated a overturning of the structure, providing a new colonizing surface for growth of microorganisms and resulting in a bilateral internal structure.

The characterization of these stages, including the overturning of the structure, not only provides a highly accurate proxy for reconstructing punctual environmental conditions of the Yacoraite Formation, but also opens up a field of discussion focused on the resilience and recolonization capacity of stromatolite-producing microorganisms after stochastic events.

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来源期刊
Cretaceous Research
Cretaceous Research 地学-地质学
CiteScore
4.10
自引率
19.00%
发文量
235
审稿时长
12 weeks
期刊介绍: Cretaceous Research provides a forum for the rapid publication of research on all aspects of the Cretaceous Period, including its boundaries with the Jurassic and Palaeogene. Authoritative papers reporting detailed investigations of Cretaceous stratigraphy and palaeontology, studies of regional geology, and reviews of recently published books are complemented by short communications of significant new findings. Papers submitted to Cretaceous Research should place the research in a broad context, with emphasis placed towards our better understanding of the Cretaceous, that are therefore of interest to the diverse, international readership of the journal. Full length papers that focus solely on a local theme or area will not be accepted for publication; authors of short communications are encouraged to discuss how their findings are of relevance to the Cretaceous on a broad scale. Research Areas include: • Regional geology • Stratigraphy and palaeontology • Palaeobiology • Palaeobiogeography • Palaeoceanography • Palaeoclimatology • Evolutionary Palaeoecology • Geochronology • Global events.
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