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Three-dimensional stromatolites from Maastrichtian–Danian Yacoraite Formation, Argentina: modelling and assessing hydrodynamic controls on growth patterns
Geological Magazine ( IF 2.0 ) Pub Date : 2021-04-29 , DOI: 10.1017/s0016756821000315
Patricio Guillermo Villafañe , Carlos Cónsole-Gonella , Paolo Citton , Ignacio Díaz-Martínez , Silvina de Valais

Stromatolites are biogenic sedimentary structures formed by the interplay of biological (microbial composition) and environmental factors (local hydrodynamic conditions, clastic input and/or water chemistry). Well-preserved, three-dimensional (3D) fossil stromatolites are key to assessing the environmental factors controlling their growth and resulting morphology in space and time. Here, we report the detailed analysis of well-exposed, highly informative stromatolite build-ups from a single stratigraphic horizon within the Maastrichtian–Danian Yacoraite Formation (Argentina). This study focuses on the analysis of depositional processes driving intertidal to shallow subtidal stromatolites. Overall depositional architecture, external morphology and internal arrangement (mega, macro, meso and microstructures) of stromatolite build-ups were analysed and combined with 3D photogrammetric models, allowing us to decipher the links between stromatolite structure and tidal dynamics. Results suggest that external morphology and architecture of elongated and parallel clusters grew under the influence of run-off channels. The internal morphology exhibits columnar structures where the space between columns is interpreted as recharge or discharge channels. This work supports the theory that stromatolites can be used as a high-resolution tool in the assessment of water dynamics, and provides a new methodological approach and data for the dynamic reconstruction of intertidal stromatolite systems through the geological record.

中文翻译:

阿根廷 Maastrichtian-Danian Yacoraite 组的三维叠层石:建模和评估对生长模式的水动力控制

叠层石是由生物(微生物组成)和环境因素(局部水动力条件、碎屑输入和/或水化学)相互作用形成的生物沉积结构。保存完好的三维 (3D) 化石叠层石是评估控制其生长的环境因素以及由此产生的空间和时间形态的关键。在这里,我们报告了对 Maastrichtian-Danian Yacoraite 组(阿根廷)内单一地层层位曝光良好、信息量大的叠层石堆积的详细分析。本研究重点分析推动潮间带至浅潮下带叠层石的沉积过程。整体沉积结构、外部形态和内部排列(巨型、宏观、叠层石堆积的细观和微观结构)进行了分析,并与 3D 摄影测量模型相结合,使我们能够破译叠层石结构和潮汐动力学之间的联系。结果表明,细长和平行簇的外部形态和结构在径流通道的影响下生长。内部形态呈现柱状结构,柱之间的空间被解释为补给或放电通道。这项工作支持了叠层石可以作为水动力学评估的高分辨率工具的理论,并为通过地质记录动态重建潮间带叠层石系统提供了新的方法学方法和数据。使我们能够破译叠层石结构和潮汐动力学之间的联系。结果表明,细长和平行簇的外部形态和结构在径流通道的影响下生长。内部形态呈现柱状结构,柱之间的空间被解释为补给或放电通道。这项工作支持了叠层石可以作为水动力学评估的高分辨率工具的理论,并为通过地质记录动态重建潮间带叠层石系统提供了新的方法学方法和数据。使我们能够破译叠层石结构和潮汐动力学之间的联系。结果表明,细长和平行簇的外部形态和结构在径流通道的影响下生长。内部形态呈现柱状结构,柱之间的空间被解释为补给或放电通道。这项工作支持了叠层石可以作为水动力学评估的高分辨率工具的理论,并为通过地质记录动态重建潮间带叠层石系统提供了新的方法学方法和数据。内部形态呈现柱状结构,柱之间的空间被解释为补给或放电通道。这项工作支持了叠层石可以作为水动力学评估的高分辨率工具的理论,并为通过地质记录动态重建潮间带叠层石系统提供了新的方法学方法和数据。内部形态呈现柱状结构,柱之间的空间被解释为补给或放电通道。这项工作支持了叠层石可以作为水动力学评估的高分辨率工具的理论,并为通过地质记录动态重建潮间带叠层石系统提供了新的方法学方法和数据。
更新日期:2021-04-29
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