A Holocene tephra layer within coastal aeolian deposits north of Caleta Olivia (Santa Cruz Province, Argentina)
A Holocene tephra layer within coastal aeolian deposits north of Caleta Olivia (Santa Cruz Province, Argentina)
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卡莱塔奥利维亚（阿根廷圣克鲁斯省）北部沿海风成沉积物内的全新世火山灰层
DOI：
10.5027/andgeov48n2-3290
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发表时间：
2021
期刊：
影响因子：
0.9
通讯作者：
I. Passariello
中科院分区：
文献类型：
--
作者：
G. Zanchetta;M. Pappalardo;A. Roberto;M. Bini;I. Arienzo;I. Isola;A. Ribolini;G. Boretto;Enrique Fuck;D. Mele;M. D’Orazio;F. Marzaioli;I. Passariello
在本文中，我们说明了地层学，地质年代学和地球化学（主要，次要，微量元素和锶同位素）的全新世火山灰层内发现的Caleta奥利维亚（圣克鲁斯省，阿根廷）北部沿海沉积矿床。地层序列包括海滩沉积物，其基底侵蚀面位于当地基底（“Formacion Patagonia”）上，随后是发育不良的古土壤。古土壤被透镜状细粒（Mdφ：5.2，0.027 mm）、分选良好（σφ：1.2）的火山灰层和风成砂覆盖。碎片的地球化学成分指向一个起源于哈德逊火山，位于南安第斯山脉，加利福尼亚州。向西400公里。地球化学，锶同位素和放射性约束（年轻于年龄的下伏海洋层的日期约。4，100 a cal BP）进一步允许将这种火山喷发与所谓的H2喷发（约4，100 a cal BP）相关联。3，900 a cal BP）。由于巴塔哥尼亚大西洋沿岸晚全新世沉积矿床中火山灰的保存潜力很差，这一发现是令人感兴趣的，它代表了该地区首次发现的H2喷发，提高了我们对哈德逊火山爆发活动细颗粒远端存款分散的认识，从而可以更好地估计喷发动力学和与哈德逊火山相关的风险。
In this paper we illustrate the stratigraphy, geochronology, and geochemistry (major, minor, trace elements and Sr-isotopes) of a Holocene tephra layer found within coastal sedimentary deposits north of Caleta Olivia (Santa Cruz Province, Argentina). The stratigraphic succession comprises beach deposits with basal erosive surface resting on the local substrate (“Formacion Patagonia”) followed by a poorly developed paleosoil. The paleosoil is covered by a lenticular fine-grained (Mdφ: 5.2, 0.027 mm), well sorted (σφ: 1.2) volcanic ash layer and aeolian sands. The geochemical composition of shard fragments points to an origin from the Hudson volcano, located in the southern Andes, ca. 400 km to the west. The geochemistry, Sr-isotopes and the radiometric constraints (younger than the age of the underlying marine layer dated at ca. 4,100 a cal BP) further allow correlating this tephra with the so-called H2 eruption (ca. 3,900 a cal BP). This finding is of interest owing to the poor preservation potential of tephra within the Late Holocene sedimentary deposits of the Atlantic coast of Patagonia and represents the first finding of H2 eruption in this area, improving our knowledge of the dispersion of the fine-grained distal deposit of the Hudson volcanic explosive activity, thus allowing a better estimate of the eruptive dynamics and the risks associated with the Hudson volcano.
影响因子：
4
作者：
Fontijn, Karen;Lachowycz, Stefan M.;Moreno-Roa, Hugo
通讯作者：
Moreno-Roa, Hugo
DOI：
10.1073/pnas.1204579109
发表时间：
2012-08-21
影响因子：
11.1
作者：
Lowe, John;Barton, Nick;Tzedakis, Polychronis C.
通讯作者：
Tzedakis, Polychronis C.