Cenozoic geology of the Yolomécatl-Tlaxiaco area, Northwestern Oaxaca, Southeastern Mexico: Stratigraphy, structure and regional significance

Ferrusquía-Villafranca, Ismael; Ruiz-González, José E.; Torres-Hernández, José Ramón; Anderson, Terry; Urrutia‐Fucugauchi, J.; Martínez‐Hernández, Enrique; García-Villegas, Felipe

doi:10.1016/j.jsames.2016.09.005

Cited by 13 publications

(16 citation statements)

References 24 publications

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“…The following synopsis largely draws from Ferrusquía-Villafranca et al (2016b). In this area, rock units of late Jurassic to Quaternary ages are exposed (Figures 2-3).…”

Section: Geologic Settingmentioning

confidence: 99%

“…The Yolomécatl Formation chiefly consists of friable to moderately indurated, largely fine-grained quartzitic-volcanic arenite, fine-grained sandstone, clayey siltstone of similar composition, and silty smectite claystone set in medium to very thick (up to 5 m) strata (Tables 1, 2 (Ferrusquía-Villafranca et al, 2016b), that places this unit and its biota in the early late Eocene. 2) Clast-to matrix-supported, boulder bearing, pebble to cobble volcanic conglomerate set in medium to thick strata, forming tongues, lenses and continuous beds, mostly in the eastern part of the Yolomécatl Formation outcrop area; their clast composition is the same as that of the Nduayaco Group flows, a fact that indicates provenance from such group.…”

Section: A' Amentioning

confidence: 99%

“…The late Oligocene 27.7 ± 0.7 Ma old Nicananduta Group ( 40 Ar-39 Ar method, Ferrusquía-Villafranca et al, 2016b) is a thick volcanic succession of lava flows and autobreccias of (largely) andesitic composition and varied texture that makes up steep-slope sierras; outside but close to the area, it unconformably overlies the early Oligocene Nundichi Group which in turn overlies the Yolomécatl Formation. In the northwestern part of the area, a small part of the Nicananduta Group unconformably rests on the Yolomécatl Formation.…”

Section: A' Amentioning

confidence: 99%

“…Map used in this study were scale 1:50000 and included: (a) Carta Topográfica Yolomécatl E14D35 (INEGI, 1984) and (b) Geologic map of the Yolomécatl-Tlaxiaco area (Ferrusquía-Villafranca et al, 2016b). The software Google Earth Pro for cartographic analyses at various scales was also used.…”

Section: Cartographic Materialsmentioning

confidence: 99%

“…As a contribution to continue filling this gap, we present here the results of the research Project IN-110614, entitled "Estudio geológico-geofísico, tectono-sedimentario biótico y paleoambiental del Terciario continental de la Cuenca Yolomécatl-Tlaxiaco, Oaxaca occidental: Implicaciones en el entendimiento de la evolución cenozoica del Sureste". This is our first approach to broadly discriminate the depositional systems of the late Eocene Yolomécatl Formation, northwestern Oaxaca (Ferrusquía-Villafranca et al, 2016b); thus, a finer discrimination and mapping out the lithosfacies is left out for a future study.…”

Section: Introductionmentioning

confidence: 99%

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Depositional systems of the late Eocene Yolomécatl Formation, northwestern Oaxaca, southeastern Mexico: a first approach

Ferrusquía-Villafranca¹,

Torres-Hernández²,

Ruiz-González³

et al. 2018

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Ferrusquía-Villafranca, I., Torres-Hernández, J.R., Ruiz-González, J.E., Martínez-Hernández, E., 2018, Depositional systems of the late Eocene Yolomécatl Formation, northwestern Oaxaca, southeastern Mexico: a first approach: Revista Mexicana de Ciencias Geológicas, v. 35, núm. 2, p. 142-157. ABSTRACTThe discrimination/characterization of depositional systems recorded in formal lithostratigraphic, Cenozoic, continental, epiclastic units of Mexico, is largely a pending task, notwithstanding its great academic and economic importance. Contributing to fill this gap, we present a first approach to discriminate and characterize the depositional systems of the late Eocene Yolomécatl Formation, which fills the namesake, triangle-shaped tectonic basin, and carries the southernmost Paleogene vertebrate fauna of North America. The study area lies between 17°25'-17°30' North Latitude and 97°29'-97°36' West Longitude, and between 2000-2500 m a.s.l.; the federal highway 125 traverses it; Santiago Yolomécatl is the main town.The Yolomécatl Formation is at least 650 m thick, although the continuous thickness measured in the principal reference section is much less (~250 m); it includes fluvial and lake depositional systems sparsely interbedded by tuff sheets (a system per se). The fluvial system consists of 1) Gmm, Gmg, Gcm lithofacies: alluvial fans and related deposits; 2) Gm, Gh, Gp, Gt, St, Sp lithofacies: channel lag deposits; 3) Sr, Sh, Sl, Fl lithofacies: floodplain deposits. The (clastic) lacustrine system includes: 1) Ll, Lsm, Lm lithofacies: offshore deposits; 2) Ll, Lsm lithofacies: playa lake and mud flats deposits. This large thickness of this unit indicates superposition of fluvial/lacustrine systems, and sparse pyroclastic emplacements that took place in a basin gradually subsiding with sedimentation, under humid to subhumid conditions, probably interrupted by seasonal dryness.Finally, the tectonic setting of the Yolomécatl Basin, indicates that its genesis and development are related to the dynamics of the regional, left-lateral strike-slip Tamazulapam fault, which is also regarded as the boundary between the Mixteca (west) and Oaxaca (east) terranes. INTRODUCTIONAfter ~130 years of geologic research in Mexico, important tasks have been barely touched, such as the discrimination and characterization of depositional systems registered in formal, continental, epiclastic, Cenozoic lithostratigraphic units of this country, in spite of their academic and economic importance. Only a few papers on this subject have been published (e.g. Chávez-Cabello et al., 2007;Ferrusquía-Villafranca and Ruiz-González, 2011;Ferrusquía-Villafranca et al., 2016a;Puy-Alquiza et al., 2017

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“…The following synopsis largely draws from Ferrusquía-Villafranca et al (2016b). In this area, rock units of late Jurassic to Quaternary ages are exposed (Figures 2-3).…”

Section: Geologic Settingmentioning

confidence: 99%

Section: A' Amentioning

confidence: 99%

Section: A' Amentioning

confidence: 99%

Section: Cartographic Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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