阿根廷西北部Humahuaca和Casa Grande山间盆地上新世-更新世灰落凝灰岩:年代地层重建示踪剂及火山岩来源识别关键

IF 0.9 4区 地球科学 Q3 GEOLOGY
B. Coira, C. Galli, Suzanne Mahlburg Kay, D. Stockli, P. Flores, Emilio Eveling
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引用次数: 0

摘要

根据新的地球化学和年代学资料,将阿根廷西北部Humahuaca和Casa Grande山间盆地上新世—更新世灰岩凝灰岩划分为两组,分别对应于上新世—下更新世以碎屑流为主的冲积扇沉积、深砂砾石辫状沉积、浅短命湖沉积(Uquia组和Mal Paso组)和更新世冲积扇片洪沉积。所识别的年龄群分别为4.3 ~ 2.6 Ma和2.2 ~前0.8 Ma,与研究区西部Altiplano Puna火山复合体(APVC)和南Puna破火山口的火成岩喷发脉冲相吻合。两组灰渣凝灰岩均以玻璃质-斑晶为主,流纹石-英安岩成分少,安山岩-粗山岩成分少,SiO2含量为58 ~ 69%,A/CNK 1 ~ 1.4, FeO/MgO(0.8 ~ 2.8),在钙碱性范围内。它们可以根据其不可移动的微量元素比率来区分,在较年轻的组中,LREE轻微富集,较高的弧隶属度和略高的Sm/Yb比率,尽管Sm/Yb比率都表明残留角闪石中有HREE的固存。这些火山灰落凝灰岩的地球化学和地质年代学数据表明,它们是上新世-更新世期间Humahuaca和Casa Grande山间盆地地层的年代地层示踪剂,也是确定其火山来源的关键。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Pliocene-Pleistocene ash-fall tuff deposits in the intermountain Humahuaca and Casa Grande basins, northwestern Argentina: tracers in chronostratigraphic reconstructions and key to identify their volcanic sources
Ash-fall tuffs of the Pliocene-Pleistocene deposits of Humahuaca and Casa Grande intermountain basins, northwestern Argentina, have been differentiated into two groups based on new geochemical and geochronological data which correspond to the tuffs of the Pliocene- Lower Pleistocene alluvial fan deposits dominated by debris flow, deep sandy gravel braided, and shallow ephemeral lake deposits (Uquia and Mal Paso formations),and those recorded in Pleistocene alluvial fans sheet flood deposits. The two clusters of ages recognized: 4.3 to 2.6 Ma, and 2.2–pre 0.8 Ma, corresponding to those groups, are in agreement with pulses of ignimbrite eruptions in the Altiplano Puna Volcanic Complex (APVC), and Southerm Puna calderas located west of the study region. The ash-fall tuffs of both groups are mainly vitreous to phenocryst-poor of rhyodacite-dacite composition with minor andesites to trachyandesites, characterized by 58-69% SiO2 contents, A/CNK 1-1.4, FeO/MgO (0.8-2.8), which plot in the calc-alkaline range. They can be differentiated based on its immobile trace elements ratios as indicated by a slight enrichment in LREE, higher arc affiliation and somewhat higher Sm/Yb ratios in the case of the younger group, although in both Sm/Yb ratios are indicative of sequestration of HREE in residual hornblende. The new geochemical and geochronological data of those ash fall tuffs point to these as chrono-stratigraphic tracers of the Humahuaca and Casa Grande intermountain basins stratigraphy, during the Pliocene-Pleistocene, also as the key to identify their volcanic sources.
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来源期刊
Andean Geology
Andean Geology 地学-地质学
CiteScore
3.90
自引率
0.00%
发文量
17
审稿时长
>12 weeks
期刊介绍: This journal publishes original and review articles on geology and related sciences, in Spanish or English, in three issues a year (January, May and September). Articles or notes on major topics of broad interest in Earth Sciences dealing with the geology of South and Central America and Antarctica, and particularly of the Andes, are welcomed. The journal is interested in publishing thematic sets of papers and accepts articles dealing with systematic Paleontology only if their main focus is the chronostratigraphical, paleoecological and/or paleogeographical importance of the taxa described therein.
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