Significance of provenance ages from the chiapas massif complex (Southeastern Mexico): Redefining the paleozoic basement of the maya block and its evolution in a peri-gondwanan realm

Bodo Weber, Victor A. Valencia, Peter Schaaf, Valerie Pompa-Mera, Joaquin Ruiz

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Abstract

Medium- to high-grade metasedimentary rocks are exposed as isolated domains in mostly metaigneous crystalline rocks of the Chiapas Massif Complex (CMC), which forms the basement of the southern Maya Block, southeastern Mexico. Laser ablation multicollector inductively coupled plasma mass spectrometry U-Pb isotope analyses on inherited detrital zircon cores show two principal age distributions: [a] Group I, with its highest peak at 500-650 Ma and smaller peaks at ∼380-400 Ma, 1.0-1.2 Ga, 1.5-2.0 Ga, and 2.6-3.1 Ga, and [b) Group II, with its highest peak at 1.0-1.2 Ga, a minor peak at 1.5-1.6 Ga (or ∼1.0-Ga zircon cores only), and a lack of 500-650-Ma zircons. The cores are commonly surrounded by metamorphic or anatectic overgrowths, and some zircon ages were reset by a tectonothermal event at ∼250 Ma. The age distribution of zircon cores from Group I metasediments are similar to detrital zircon ages in Carboniferous-Permian sediments (Santa Rosa Formation) in southeastern Chiapas, which were shed mostly from continental crust dominated by Pan-African-Brasiliano orogenic cycles. Group II metasediments have different sources, principally from Grenville orogens, such as the Oaxacan Complex, and early mid-Proterozoic sources, such as the Rio Negro-Juruena Province of western Amazonia. The lowest stratigraphie unit in the CMC (the Jocote Unit) is intruded by lower Ordovician S-type granite and contains only 1.5-1.6-Ga and older detrital zircons. The protoliths of the CMC can be correlated with Paleozoic strata across the southern Maya Block, and they show parallels with the geologic history and provenance patterns of protoliths from the Acatlán Complex (Mixteca Terrane) of central southern Mexico. The geologic history of the CMC and the Maya Block can be interpreted in terms of tectonothermal events accompanying accretion of the CMC and polarity reversal during formation of the western Pangea margin.

Original languageEnglish (US)
Pages (from-to)619-639
Number of pages21
JournalJournal of Geology
Volume116
Issue number6
DOIs
StatePublished - Nov 2008
Externally publishedYes

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provenance
zircon
Paleozoic
metasediment
protolith
age structure
metaigneous rock
magnetic reversal
Pangaea
crystalline rock
metasedimentary rock
history
ablation
continental crust
terrane
Ordovician
Proterozoic
Permian
granite
mass spectrometry

ASJC Scopus subject areas

  • Geology

Cite this

Significance of provenance ages from the chiapas massif complex (Southeastern Mexico) : Redefining the paleozoic basement of the maya block and its evolution in a peri-gondwanan realm. / Weber, Bodo; Valencia, Victor A.; Schaaf, Peter; Pompa-Mera, Valerie; Ruiz, Joaquin.

In: Journal of Geology, Vol. 116, No. 6, 11.2008, p. 619-639.

Research output: Contribution to journalArticle

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abstract = "Medium- to high-grade metasedimentary rocks are exposed as isolated domains in mostly metaigneous crystalline rocks of the Chiapas Massif Complex (CMC), which forms the basement of the southern Maya Block, southeastern Mexico. Laser ablation multicollector inductively coupled plasma mass spectrometry U-Pb isotope analyses on inherited detrital zircon cores show two principal age distributions: [a] Group I, with its highest peak at 500-650 Ma and smaller peaks at ∼380-400 Ma, 1.0-1.2 Ga, 1.5-2.0 Ga, and 2.6-3.1 Ga, and [b) Group II, with its highest peak at 1.0-1.2 Ga, a minor peak at 1.5-1.6 Ga (or ∼1.0-Ga zircon cores only), and a lack of 500-650-Ma zircons. The cores are commonly surrounded by metamorphic or anatectic overgrowths, and some zircon ages were reset by a tectonothermal event at ∼250 Ma. The age distribution of zircon cores from Group I metasediments are similar to detrital zircon ages in Carboniferous-Permian sediments (Santa Rosa Formation) in southeastern Chiapas, which were shed mostly from continental crust dominated by Pan-African-Brasiliano orogenic cycles. Group II metasediments have different sources, principally from Grenville orogens, such as the Oaxacan Complex, and early mid-Proterozoic sources, such as the Rio Negro-Juruena Province of western Amazonia. The lowest stratigraphie unit in the CMC (the Jocote Unit) is intruded by lower Ordovician S-type granite and contains only 1.5-1.6-Ga and older detrital zircons. The protoliths of the CMC can be correlated with Paleozoic strata across the southern Maya Block, and they show parallels with the geologic history and provenance patterns of protoliths from the Acatl{\'a}n Complex (Mixteca Terrane) of central southern Mexico. The geologic history of the CMC and the Maya Block can be interpreted in terms of tectonothermal events accompanying accretion of the CMC and polarity reversal during formation of the western Pangea margin.",
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