Pliocene-Pleistocene Palynoflora recovered from the Villa Alegr and Cierro Prieta Travertines in the Tehuacan- Cuicatlan Valley, Mexico
Por:
Rosales-Torres, Sara, Ramirez-Arriaga, Elia, Martinez-Bernal, Angelica, del Rocio Zarate-Hernandez, Maria, Valiente-Banuet, Alfonso, Zoilo Marquez-Garcia, Antonio
Publicada:
1 ago 2017
Categoría:
Geology
Resumen:
Using standard methods, the Pliocene-Pleistocene paleopalynological
assemblages recovered from both the Villa Alegria lacustrine sediments
in northern Tehuacan-Cuicatlan Valley (TCV) and the Cerro Prieto
travertine in the southern portion of the TCV exhibited high taxa
diversity. Clear groupings of floristic elements were observed in
cluster and multivariate principal components analysis (PCA), suggesting
that during the Pliocene-Pleistocene the regional vegetation comprised
cloud forest (possibly containing undergrowth rich in Cyatheaceae),
pine-oak forest, gallery forest, mexical and tropical deciduous forest.
For the Pleistocene, paleopalynological assemblages recovered from the
Cerro Prieto travertine suggest that climatic conditions were slightly
colder and more humid. The distribution of vegetation harbored by the
TCV followed an altitudinal moisture gradient caused by the topography.
Based on previous geological studies, the sedimentation environment
inferred for Villa Alegria lacustrine sediments was a lake saturated in
calcium carbonate sourced from the Sierra Mazateca, while that of the
Cerro Prieto travertine was a flood zone in which carbonate-saturated
waters from the Zapotitlan Formation accumulated. Based on biozone
abundance, strong correlation between Villa Alegria lacustrine sediments
and the Cerro Prieto travertine was observed.
Filiaciones:
Rosales-Torres, Sara:
Univ Autonoma Metropolitana, Dept Biol, Div Ciencias Biol & Salud, Unidad Iztapalapa, San Rafael Atlixco 186, Del Iztapalapa 09340, Ciudad De Mexic, Mexico
Ramirez-Arriaga, Elia:
Univ Nacl Autonoma Mexico, Dept Paleontol, Inst Geol, Circuito Invest Cient S-N,Ciudad Univ, Del Coyoacan 04510, Ciudad De Mexic, Mexico
Martinez-Bernal, Angelica:
Univ Autonoma Metropolitana, Dept Biol, Div Ciencias Biol & Salud, Unidad Iztapalapa, San Rafael Atlixco 186, Del Iztapalapa 09340, Ciudad De Mexic, Mexico
del Rocio Zarate-Hernandez, Maria:
Univ Autonoma Metropolitana, Dept Biol, Div Ciencias Biol & Salud, Unidad Iztapalapa, San Rafael Atlixco 186, Del Iztapalapa 09340, Ciudad De Mexic, Mexico
Valiente-Banuet, Alfonso:
Univ Nacl Autonoma Mexico, Circuito Exterior Univ, Inst Ecol, Ciudad Univ, Del Coyoacan 04510, Ciudad De Mexic, Mexico
Univ Nacl Autonoma Mexico, Circuito Cultural Univ, Ctr Ciencias Complejidad, Ciudad Univ, Del Coyoacan 04510, Ciudad De Mexic, Mexico
Zoilo Marquez-Garcia, Antonio:
Univ Autonoma Metropolitana, Div Ciencias Biol & Salud, Dept Hidrobiol, Unidad Iztapalapa, San Rafael Atlixco 186, Del Iztapalapa 09340, Ciudad De Mexic, Mexico
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