The relationship of the Proterozoic Hondo Group to older rocks, southern Picuris Mountains and adjacent areas, northern New Mexico
— Christopher K. Mawer, J. A. Grambling, M. L. Williams, P. W. Bauer, and J. M. Robertson

Abstract:

At least three distinct Proterozoic rock packages are present in the southern Picuris Mountains and adjacent areas of northern New Mexico. These are: (1) an older (ca. 1765-1720 Ma) dominantly mafic metavolcanic assemblage or assemblages, examples being the Moppin, Pecos and Gold Hill Complexes, interpreted to have formed during arc-related volcanism; (2) a ca. 1700 Ma assemblage of dominantly felsic metavolcanic and metasedimentary rocks, the Vadito Group, interpreted to have formed during continental rift-related volcanism; and (3) a younger, essentially metasedimentary assemblage, the Hondo Group, a product of stableshelf deposition. Felsic intrusive bodies cut both older assemblages but do not intrude the Hondo Group. The contact between Vadito and Hondo Groups has been investigated in detail; it is deformed strongly in most areas but appears to be depositional. The contact between the older mafic assemblage and the Vadito Group is everywhere tectonic. The Marquenas Formation, a key unit in the Precambrian stratigraphy of the southern Picuris Mountains, belongs to the upper part of the Vadito Group; it is not the stratigraphically youngest sequence in the Proterozoic rocks of northern New Mexico as Soegaard and Eriksson (1986) suggest.


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Recommended Citation:

  1. Mawer, Christopher K.; Grambling, J. A.; Williams, M. L.; Bauer, P. W.; Robertson, J. M., 1990, The relationship of the Proterozoic Hondo Group to older rocks, southern Picuris Mountains and adjacent areas, northern New Mexico, in: Tectonic development of the southern Sangre de Cristo Mountains, New Mexico, Bauer, Paul W.; Lucas, Spencer G.; Mawer, Christopher K.; McIntosh, William C., New Mexico Geological Society, Guidebook, 41st Field Conference, pp. 171-177.

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