The Triassic/Jurassic boundary and the Jurassic stratigraphy and biostratigraphy of northern Sonora, northwest Mexico

Carlos M. González-León, George D. Stanley, Timothy F. Lawton, J. Pálfy, Montana S. Hodges

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The Triassic and Jurassic geology of northern Sonora encompasses important events that are linked to the late Paleozoic history of the region. The fossiliferous El Antimonio Group in the Sierra del álamo includes the upper Permian-Triassic Antimonio, and Río Asunción formations and the Hettangian-Sinemurian Sierra de Santa Rosa Formation. These formations consist of upward-fining sequences from I to XIV that represent fluvial to shallow and deep marine environments of deposition. The Triassic/Jurassic boundary in this region is a hiatus represented by a disconformity between sequence IX of the Río Asunción formations and sequence X of the Sierra de Santa Rosa Formation. The shallow to deep marine succession of the Sierra de Santa Rosa composes the upper part of the Sierra de Santa Rosa Formation that ranges in age from late Sinemurian to early Pliensbachian. Ages of the Permian to Triassic plutonic rocks of northwesternmost Sonora, the Mojave Desert and the Jurassic continental margin Nazas arc that crossed through northern Sonora, are also well recorded by igneous clasts and detrital zircon grains that have been dated from the El Antimonio Group and other Jurassic formations of this region. The upper Oxfordian-lower Tithonian Cucurpe Formation in north-central Sonora recorded the onset of continental extension and incursion of marine waters from the Gulf of Mexico into northwestern Mexico, once activity of the Jurassic magmatic arc ended.

Original languageEnglish
Pages (from-to)711-738
Number of pages28
JournalBoletin de la Sociedad Geologica Mexicana
Volume69
Issue number3
DOIs
Publication statusPublished - Jan 1 2017

Fingerprint

biostratigraphy
stratigraphy
Triassic
Jurassic
Sinemurian
Permian
fining sequence
Hettangian
Pliensbachian
Tithonian
Oxfordian
hiatus
plutonic rock
clast
continental margin
marine environment
zircon
Paleozoic
desert
geology

Keywords

  • Biostratigraphy
  • Cucurpe Formation
  • El Antimonio Group
  • Sierra de Santa Rosa Formation
  • Triassic-Jurassic

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

Cite this

The Triassic/Jurassic boundary and the Jurassic stratigraphy and biostratigraphy of northern Sonora, northwest Mexico. / González-León, Carlos M.; Stanley, George D.; Lawton, Timothy F.; Pálfy, J.; Hodges, Montana S.

In: Boletin de la Sociedad Geologica Mexicana, Vol. 69, No. 3, 01.01.2017, p. 711-738.

Research output: Contribution to journalArticle

González-León, Carlos M. ; Stanley, George D. ; Lawton, Timothy F. ; Pálfy, J. ; Hodges, Montana S. / The Triassic/Jurassic boundary and the Jurassic stratigraphy and biostratigraphy of northern Sonora, northwest Mexico. In: Boletin de la Sociedad Geologica Mexicana. 2017 ; Vol. 69, No. 3. pp. 711-738.
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