The importance of coastal geomorphological setting as a controlling factor on microtextural...

IF 1.3 4区 地球科学 Q2 GEOLOGY Geologica Acta Pub Date : 2019-05-27 DOI:10.1344/GEOLOGICAACTA2019.17.4
Pedro J. M. Costa, D. Silva, L. Figueirinhas, J. Lario
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引用次数: 6

Abstract

Quartz grains collected from Arauco and Mataquito (central Chile) after the 2010 Maule tsunami presented an overwhelming dominance of dissolution textures. The analysis of superficial imprints proved that some grains were mechanically impacted before deposition. However, the percentage of grains with fresh surfaces and percussion marks was significantly lower than average values from other tsunami deposits elsewhere in the world. In this work, we discuss the reasons for such results in the context of the geomorphological setting of the areas analyzed and its influence on the microtextural signatures observed. The data presented in this study evidences a geographic dependence in the type of microtextures in the areas analyzed. For example, in Arauco the abundance of dissolution textures decreases rapidly towards the center of the embayment and increases towards the rocky headlands of its westernmost sector. By contrast, an increase of mechanical marks (e.g. fresh surfaces) is observed in the central region of the Arauco’s embayment. Similarly, in Mataquito, dissolution features are more abundant in the headlands or small capes, while there is a higher presence of mechanical marks in sandy embayments. The results of this study demonstrate the importance of the geomorphological context as a controlling factor in the intensity of mechanical imprints on the surface of quartz grains transported by tsunamis and deposited in the inner shelf and coastal areas. Therefore, our results suggest that without a detailed geomorphological contextualization microtextural discrimination can lead to misleading interpretations. Hence, there is a need for more microtextural analysis on tsunami deposits in order to assess the variability in the geographic distribution and intensity of microtextures imprinted on the surface of quartz grains deposited during a tsunami event.
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海岸带地貌环境对微结构的影响是一个重要的控制因素。
2010年Maule海啸后,在Arauco和Mataquito(智利中部)采集的石英颗粒显示出压倒性的溶解结构优势。表面印迹分析证明,部分颗粒在沉积前受到了机械冲击。然而,具有新鲜表面和冲击痕迹的颗粒的百分比明显低于世界其他地方海啸沉积物的平均值。在这项工作中,我们在分析地区的地貌环境及其对观察到的微结构特征的影响的背景下讨论了产生这种结果的原因。本研究中提供的数据证明了所分析地区微纹理类型的地理依赖性。例如,在阿劳科,溶解结构的丰度在靠近海湾中心的地方迅速减少,而在靠近其最西端的岩石岬角的地方增加。相比之下,在阿劳科洞穴的中心区域观察到机械痕迹(如新鲜表面)的增加。同样,在Mataquito,溶解特征在海岬或小岬角更为丰富,而在沙质河口则有更多的机械痕迹。本研究的结果表明,在海啸运输并沉积在内陆架和沿海地区的石英颗粒表面的机械印记强度中,地貌环境是一个重要的控制因素。因此,我们的研究结果表明,如果没有详细的地貌背景化,微纹理区分可能会导致误导性的解释。因此,有必要对海啸沉积物进行更多的微结构分析,以评估海啸事件期间沉积的石英颗粒表面微结构的地理分布和强度的变化。
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来源期刊
Geologica Acta
Geologica Acta 地学-地质学
CiteScore
2.50
自引率
6.70%
发文量
13
审稿时长
>12 weeks
期刊介绍: - Relevant conceptual developments in any area of the Earth Sciences. - Studies presenting regional synthesis. - Thematic issues or monographic volumes presenting the results from one or more research groups. - Short papers reflecting interesting results or works in progress. - Contributions and results from Research Projects, Workshops, Symposiums, Congresses and any relevant scientific activity related to Earth Sciences. - Geologica Acta aims to stimulate rapid diffusion of results and efficient exchange of ideas between the widespread communities of Earth Science researchers (with special emphasis on Latinamerica, the Caribbean, Europe, the Mediterranean
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