Sedimentary facies analysis of the Mesozoic clastic rocks in southern Peru (Tacna, 18°S): Towards a paleoenvironmental Re-definition and stratigraphic Re-organization

Journal article
(Letter)


Publication Details

Author(s): Alvan A, Jacay J, Caracciolo L, Sanchez E, Trinidad I
Journal: Journal of South American Earth Sciences
Publication year: 2018
ISSN: 0895-9811
Language: English


Abstract

The Mesozoic rocks of southern Peru comprise a Middle Jurassic to Early Cretaceous sedimentary sequence deposited during a time interval of approximately 34 Myr. These rocks constitute the Yura Group (Callovian to Tithonian) and the Hualhuani Formation (Berriasian). Basing on robust interpretation of facies and petrographic analysis, we reconstruct the depositional settings of such units and provide a refined stratigraphic framework. Accordingly, nine types of sedimentary facies and six architectural elements are defined. They preserve the record of a progradational fluvial system, in which two types of fluvial systems regulated the dispersion of sediments: (i) a high-to moderate-sinuosity meandering system (Yura Group), and a later (ii) incipient braided system (Hualhuani Formation).

The Yura Group (Callovian-Tithonian) represents the onset of floodplain deposits and lateral accretion of point-bar deposits sited on a semi-flat topography. Nonetheless, the progradational sequence was affected by at least two rapid marine ingressions occurred during Middle Callovian and Tithonian times. Such marine ingressions reveal the proximity of a shallow marine setting. In response to increase in topographic gradient, the Hualhuani Formation (Berriasian) deposited as extensive multistory sandy channels. The mineralogy of the Mesozoic sediments suggests sediment supplies and recycling from a craton interior (i.e. Amazon Craton and/or plutonic sources) located eastward of the study area.


FAU Authors / FAU Editors

Caracciolo, Luca Dr.
Lehrstuhl für Geologie (Exogene Dynamik)


How to cite

APA:
Alvan, A., Jacay, J., Caracciolo, L., Sanchez, E., & Trinidad, I. (2018). Sedimentary facies analysis of the Mesozoic clastic rocks in southern Peru (Tacna, 18°S): Towards a paleoenvironmental Re-definition and stratigraphic Re-organization. Journal of South American Earth Sciences. https://dx.doi.org/10.1016/j.jsames.2018.04.014

MLA:
Alvan, Aldo, et al. "Sedimentary facies analysis of the Mesozoic clastic rocks in southern Peru (Tacna, 18°S): Towards a paleoenvironmental Re-definition and stratigraphic Re-organization." Journal of South American Earth Sciences (2018).

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Last updated on 2018-10-08 at 23:09