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The Eocene-Oligocene Nanchititla dike swarm, eastern Michoacán, México

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  • María Jazmín Chávez-Álvarez
  • Mariano Cerca
  • Margarita López Martínez
  • Gabriel Origel-Gutiérrez
  • Luca Ferrari

Abstract

We present a geologic map for the Eocene-Oligocene Nanchititla mafic dike swarm consisting of over 140 NNW-SSE trending dike segments; whose emplacement was influenced by the left-lateral transtensional deformation regime prevailing in southern México during the Cenozoic. The hosting rock is a mechanically heterogeneous continental sedimentary sequence interbedded with volcanic rocks. Interaction among magma and host rock promoted the formation of dike-sill systems, segmentation and sinuous intrusions. Dike thickness observed is between 1 and 45 m with a peak in the range from 1 to 5 m. Six giant dikes of more than 30 m thick were documented. The 80% of the dikes have porphyritic textures rich in plagioclase phenocrysts with size ranging from 0.5 to 2.5 cm. New and compiled 40Ar-39Ar ages constrain the swarm emplacement between 30 and 34.5 Ma, whereas plagioclase phenocrysts entrained by the magma have older ages between 35 and 42 Ma.

Suggested Citation

  • María Jazmín Chávez-Álvarez & Mariano Cerca & Margarita López Martínez & Gabriel Origel-Gutiérrez & Luca Ferrari, 2020. "The Eocene-Oligocene Nanchititla dike swarm, eastern Michoacán, México," Journal of Maps, Taylor & Francis Journals, vol. 16(2), pages 87-97, December.
    • Handle: RePEc:taf:tjomxx:v:16:y:2020:i:2:p:87-97
    DOI: 10.1080/17445647.2019.1698474
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