Non-parametric statistics as a tool for provenance analysis in gravel deposits: Vinchina Formation (Miocence, Argentine) as a study case

Autores/as

  • Marianela Díaz Centro de Investigaciones de la Geósfera y Biósfera CIGEOBIO (CONICET/UNSJ), San Juan, Argentina. / Departamento de Geología, Facultad de Ciencias Exactas, Físicas y Naturales (UNSJ), San Juan, Argentina.
  • Sergio A. Marenssi Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (UBA-CONICET), Ciudad Autónoma de Buenos Aires, Argentina.
  • Carlos O. Limarino Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (UBA-CONICET), Ciudad Autónoma de Buenos Aires, Argentina.

Palabras clave:

Statistical analysis, Provenance, Conglomerates, Vinchina Formation, Miocene

Resumen

The Neogene Vinchina Basin developed between 27 and 33°S as a foreland basin as a response to the Andean deformation in the southern part of the Central Andes. The Miocene Vinchina Formation (Turner, 1964) was deposited mainly in fluvial, fluvial-eolian, eolian, and lacustrine environments, reaching up to 6400 m in thickness representing the main depositional unit in the basin. This unit is remarkably exposed along the Sierra de Los Colorados (La Rioja Province, Argentina), where this study was carried out.
The results from statistical analyses from 33 gravel beds, their modal compositions, compositional trends, and distribution patterns, based on in-situ lithological clast-counting, are presented. The statistical approach was carried out by using hierarchical clustering and principal components analysis (PCA), which permitted differentiating three compositional clusters thought to represent different petrofacies. The first cluster involves samples with compositions widely dominated by neovolcanic andesitic clasts, where intrabasinal volcanic effusions were the main detrital source. The second one comprises samples with mixed compositions dominated by paleovolcanic clasts. Detrital sources of this cluster were primarily the cordilleran/precordilleran area, with subordinated contributions from the Western Sierras Pampeanas crystalline basement and intrabasinal volcanic deposits. The third cluster involves mixed samples with a dominance of crystalline-basement supply. The main source area for these samples was the Western Sierras Pampeanas, although the cordilleran/precordilleran supply is present in significant proportions.
This study illustrates the merit of using non-parametric statistics in provenance studies, especially to detect internal compositional variations when multiple source areas are active.

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Publicado

2020-11-06

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Díaz, M., Marenssi, S. A., & Limarino, C. O. . (2020). Non-parametric statistics as a tool for provenance analysis in gravel deposits: Vinchina Formation (Miocence, Argentine) as a study case. Latin American Journal of Sedimentology and Basin Analysis, 27(2), 163-183. Recuperado a partir de https://lajsba.sedimentologia.org.ar/index.php/lajsba/article/view/43

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