Multiproxy provenance analyses in the Devonian Villavicencio Formation of the Mendoza Precordillera, Argentina: correlation and geotectonic implications for the SW Gondwana margin

IF 2 4区 地球科学 Q1 GEOLOGY
Federico D. Wenger, Jonatan A. Arnol, N. Uriz, C. Cingolani, P. Abre, M. Basei
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引用次数: 1

Abstract

This work focuses on the sedimentary provenance of the Villavicencio Formation of the Mendoza Precordillera and integrates the information obtained with previous work on other coeval units of the Precordillera Central of San Juan province (Gualilán Group: Talacasto and Punta Negra formations) in western Argentina. Multiproxy provenance analyses are carried out from different applied methodologies (petrography, geochemistry, morphological, and cathodoluminescence studies of detrital zircon grains, and analysis of U-Pb and Lu-Hf isotopes). The Villavicencio Formation is mostly composed of pelites and very fine-grained psammites. The major components are quartz, both monocrystalline and polycrystalline, and metamorphic lithics that associate this unit with a recycled orogen. Regarding geochemistry, the Chemical Index of Alteration (CIA) values are similar to the Post-Archean Australian Shales (PAAS), indicating a null to incipient degree of weathering. The ratios between different trace elements and rare earth elements (REEs) suggest the felsic composition of the source area. Th/U ratios differ, but a secondary uranium enrichment is inferred. The morphological analysis of the zircon grains reveals their mainly plutonic origin. The integration of U-Pb data with Lu-Hf data shows a juvenile-mantle origin in which the populations are dominantly Mesoproterozoic and ɛHf of positive values (up to 12), indicating poor differentiation. The Villavicencio Formation would be the product of deltaic deposits in which its components are dominantly from the Western Pampean Sierras associated with the Grenville orogen, assuming exhumation and erosion of the Mesoproterozoic basement. The data support the hypothesis of equivalence and correlation with the Punta Negra Formation in the Devonian depocenters of the south-central region of the San Juan Precordillera.
阿根廷门多萨Precordillera泥盆纪Villavicencio组多代物源分析:西南冈瓦纳边缘对比及其大地构造意义
这项工作的重点是Mendoza Precordilera的Villavicencio组的沉积物源,并整合了之前在阿根廷西部圣胡安省中部Precordillera的其他同时代单元(Gualilán群:Talacasto和Punta Negra组)的工作中获得的信息。从不同的应用方法(碎屑锆石颗粒的岩石学、地球化学、形态和阴极发光研究,以及U-Pb和Lu-Hf同位素的分析)进行了多价物源分析。Villavicencio组主要由泥质岩和细粒度的砂屑岩组成。主要成分是石英,包括单晶和多晶,以及将该单元与再生造山带联系在一起的变质岩。关于地球化学,化学蚀变指数(CIA)值与后太古宙澳大利亚页岩(PAAS)相似,表明风化程度为零至初始。不同微量元素与稀土元素(REEs)的比例表明了源区的长英质成分。Th/U比值不同,但推断为二次铀浓缩。锆石颗粒的形态分析揭示了其主要的深成成因。U-Pb数据与Lu-Hf数据的整合显示了一个幼年地幔起源,其中种群主要为中元古代和正值(高达12)的Hf,表明分化较差。Villavicencio组将是三角洲沉积的产物,其中其成分主要来自与Grenville造山带相关的西潘潘Sierras,假设中元古代基底的剥露和侵蚀。这些数据支持了与圣胡安Precordilera中南部泥盆纪沉积中心Punta Negra组等效和相关性的假设。
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来源期刊
CiteScore
3.80
自引率
5.00%
发文量
50
审稿时长
3 months
期刊介绍: The journal is broad and international in scope and welcomes contributions that further the fundamental understanding of sedimentary processes, the origin of sedimentary deposits, the workings of sedimentary systems, and the records of earth history contained within sedimentary rocks.
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