The Maastrichtian-Danian Yacoraite Formation, Salta Group, Eastern Cordillera, Argentina: influence of paleorelief on the sedimentological composition

IF 1.5 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Journal of South American Earth Sciences Pub Date : 2025-08-14 DOI:10.1016/j.jsames.2025.105720

Pamela Alejandra Aparicio González , Lubín Eric Cayo , Natalia Hauser , Arnold Garcia Zavaleta , Ignacio Gallardo , Margarita Do Campo , Wolf Uwe Reimold

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引用次数: 0

Abstract

The influence of paleorelief as an indicator of the source area is analyzed here for the Yacoraite Formation of the Balbuena Subgroup (Salta Group). Provenance analysis based on detrital zircon was performed on four samples from the Yacoraite Formation in the Maimará and Juella sections. This analysis was combined with Multidimensional Scaling (MDS) techniques and U-Pb chronology previously obtained for all units underlying the Yacoraite Formation in the Tres Cruces subbasin.

For the Yacoraite samples from the Maimará section, the main sources of detrital zircons correspond to the basement units (Mesón Group and Puncoviscana Complex). At the top of the Yacoraite Formation, Ordovician zircons from the Santa Victoria Group were identified. In the Juella section, a sample from the undifferentiated Pirgua Subgroup contained Triassic and Carboniferous zircons that may be derived from Permian-Triassic plutons in the Puna region of Salta Province. Other zircons from this sample, of Ordovician, Cambrian, and Neoproterozoic age, are related to the basement of the area (Santa Victoria and Mesón groups, and the Puncoviscana Complex).

MDS analysis indicates that the closest similarity is between the U-Pb age distributions of the Pirgua Subgroup and the Jurassic Tacurú Group. The sample from the base of the Yacoraite Formation in the Juella section contains zircons (90 %) from the basement. Additionally, Devonian zircons may originate from Devonian magmatism in southern Peru.

MDS suggests similarity between the U-Pb age distributions of samples from the Lower Yacoraite Formation and the underlying units, indicating that the Pirgua Subgroup, the Mesón and Santa Victoria groups, and the Puncoviscana Complex are potential sources for the lower Yacoraite Formation.

In conclusion, the paleorelief of the hinterland has been a key control on the composition of the Yacoraite Formation. Detrital zircon populations for this formation can be successfully related to locally exposed sources.

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阿根廷东科迪勒拉萨尔塔群马斯特里赫特-达尼安雅科拉岩组：古地形对沉积学组成的影响

分析了古地形作为源区标志对巴尔布埃纳亚群（萨尔塔群）雅长石组的影响。利用碎屑锆石对maimar和Juella剖面中4个Yacoraite组样品进行了物源分析。该分析结合了多维尺度（MDS）技术和之前获得的trres Cruces次盆地Yacoraite组所有单元的U-Pb年代学。对于maimarae剖面的Yacoraite样品，碎屑锆石的主要来源对应于基底单元（Mesón群和Puncoviscana杂岩）。在雅长岩组顶部，发现了来自圣维多利亚群的奥陶系锆石。在Juella剖面中，未分化的Pirgua亚群样品中含有三叠纪和石炭系锆石，可能来自萨尔塔省Puna地区二叠纪-三叠纪的岩体。该样品中的其他锆石（奥陶纪、寒武纪和新元古代）与该地区的基底（Santa Victoria群和Mesón群以及Puncoviscana杂岩）有关。MDS分析表明，Pirgua亚群的U-Pb年龄分布与侏罗纪Tacurú群最接近。胡埃拉剖面雅长石组底部样品中含有来自基底的锆石（90%）。此外，泥盆纪锆石可能起源于秘鲁南部的泥盆纪岩浆活动。MDS结果表明，下雅歌拉岩组样品的U-Pb年龄分布与下伏单元相似，表明Pirgua亚群、Mesón和Santa Victoria群以及Puncoviscana杂岩是下雅歌拉岩组的潜在来源。综上所述，古地形对雅纹岩组的组成起着关键的控制作用。该地层的碎屑锆石种群可以成功地与当地暴露的来源联系起来。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of South American Earth Sciences 地学-地球科学综合

CiteScore

3.70

自引率

22.20%

发文量

364

审稿时长

6-12 weeks

期刊介绍： Papers must have a regional appeal and should present work of more than local significance. Research papers dealing with the regional geology of South American cratons and mobile belts, within the following research fields: -Economic geology, metallogenesis and hydrocarbon genesis and reservoirs. -Geophysics, geochemistry, volcanology, igneous and metamorphic petrology. -Tectonics, neo- and seismotectonics and geodynamic modeling. -Geomorphology, geological hazards, environmental geology, climate change in America and Antarctica, and soil research. -Stratigraphy, sedimentology, structure and basin evolution. -Paleontology, paleoecology, paleoclimatology and Quaternary geology. New developments in already established regional projects and new initiatives dealing with the geology of the continent will be summarized and presented on a regular basis. Short notes, discussions, book reviews and conference and workshop reports will also be included when relevant.