Geochemistry and mineralogy of the Eocene-Ogligocene volcanic sequence, Southern Sierra Madre Occidental, Juchipila, Zacatecas, Mexico
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Abstract
The Sierra Madre Occidental (SMO) volcanic province of western Mexico is a remnant of a broad continental-margin orogenic belt formed as a result of mid-Tertiary subduction of the Farallon plate beneath Mexico. The most voluminous rocs exposed in the SMO are rhyolitic ash-flow tuffs (AFT) erupted throughout most of the providence from 36 to 27 Ma. Two other magmatic episodes recorded in the SMO include an Eocene event (53-40 Ma) characterized by mafic-intermediate composition lava flows, and a post-ignimbrite event (29-20 Ma) characterized by the eruption of extension-related basaltic-andesites. This paper presents new data for an area in the southem SMO wich has evidence for both Eocene and Oligocene volcanism. Te stratigraphic sequence established for the area near Juchipila, Zacatecas, consists of Eocene basaltic andesite to andesite lava flows wich are uncomfortably overlain by Oligocene basalt to basaltic lava flows and/or Oligocene rhyolitic ash-flow tuffs. An upper sequence of basalt to andesite lava flows caps the section. The high-K calc-alkaline Oligocene sequence is composed predominantly of rhyolitic AFT (~25 Ma) wich are younger than most other reported SMO occurrences. This suggest a younging to the south of SMO volcanism. Although Juchipila AFT are phenocryst poor, one widespread AFT unit is characterized by alkali feldspar with unusually Ba-rich cores (up to 14% celsian component). This is the first reported occurrence for this composition feldspar in the SMO.
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References
AGUIRRE-DIAZ, G. J. and F. W. McDOWELL, 1991. The volcanic section at Nazas, Durango, Mexico, and the possibility of widespread Eocene volcanism within the Sierra Madre Occidental. J. Geophys. Res., 96, 13373-13388. DOI: https://doi.org/10.1029/91JB00245
BAGBY, W. C., K. L. CAMERON and M. CAMERON 1981. Contrasting evolution of calc-alkaline volcanic and plutonic rocks of western Chihuahua, Mexico. J. Geophys. Res., 86, 10402-10410. DOI: https://doi.org/10.1029/JB086iB11p10402
BARREIRO, B. M., M. CAMERON, K. L. CAMERON and A. GRUNDER, 1982. A lead isotope study of silicic and intermediate volcanic rocks from south-central Chile and the Sierra Madre Occidental, Mexico. Carnegie Inst. Wash. Yearbook 81, 494-498
CAMERON, K. L., M. CAMERON, W. C. BAGBY, E. J. MOLL and R. E. DRAKE, 1980. Petrologic characteristics of mid-Tertiary volcanic suites, Chihuahua, Mexico. Geology, 8, 87-91. DOI: https://doi.org/10.1130/0091-7613(1980)8<87:PCOMVS>2.0.CO;2
CAMERON, K. L. and G. N. HANSON, 1982. Rare earth element evidence concerning the origin of voluminous mid-Tertiary rhyolitic ignimbrites and related volcanic rocks, Sierra Madre Occidental, Chihuahua, Mexico. Geochim. Cosmochim. Acta, 46, 1489-1503. DOI: https://doi.org/10.1016/0016-7037(82)90309-X
CAMERON, K. L. and M. CAMERON, 1985. Rare earth element, 87Sr/86Sr, and 143Nd/144Nd compositions of Cenozoic orogenic dacites from Baja California, north-western Mexico, and adjacent west Texas: Evidence for the predominance of a subcrustal component. Contributions to Mineralogy and Petrology, 91, 1-11. DOI: https://doi.org/10.1007/BF00429422
CAMERON, K. L., M. CAMERON and B. BARREIRO, 1986. Origin of voluminous mid-Tertiary ignimbrites of the Batopilas Region, Chihuahua: Implications for the formation of continental crust beneath the Sierra Madre Occidental. Geofísica Internacional, 25, 1, 39-59. DOI: https://doi.org/10.22201/igeof.00167169p.1986.25.1.800
CAMERON, K. L., G. J. NIMZ and D. KUENTZ, 1989. Southern cordilleran basaltic andesite suite, southern Chihuahua, Mexico: A link between Tertiary continental arc and flood basalt magmatism in North America. J. Geophys. Res., 94, 7817-7840. DOI: https://doi.org/10.1029/JB094iB06p07817
CAMERON. M., W. C. BAGBY and K. L. CAMERON, 1980. Petrogenesis of voluminous mid-Tertiary ignimbrites of the Sierra Madre Occidental, Chihuahua, Mexico. Contributions to Mineralogy and Petrology, 74, 271-284. DOI: https://doi.org/10.1007/BF00371697
DAVISON, J. P., K. M. FERGUSON, M. T. COLUCCI and M. A. DUNGAN, 1988. The origin and evolution of magmas from the San Pedro-pellado volcanic complex, S. Chile; Multicomponent sources and open system evolution. Contributions to Mineralogy and Petrology, 100, 429-445. DOI: https://doi.org/10.1007/BF00371373
EWART, A., 1982. The mineralogy and petrology of Tertiary-Recent orogenic volcanic rocks: With special reference to the andesitic-basaltic compositional range. In: Orogenic Andesites and Related Rocks, edited by R. S. Thorpe, John Wiley, New York, 25-95.
HILDRETH, W. and S. MOORBATH, 1988. Crustal contributions to are magmatism in the Andes of Central Chile. Contributions to Mineralogy and Petrology, 98, 455-489. DOI: https://doi.org/10.1007/BF00372365
KRAUSE, K. W., 1984. Stratigraphy, geochemistry and petrology of the Juchipila volcanic sequence and caldera complex, Juchipila, Zacatecas, Mexico. Unpublished MS thesis, University of New Orleans, New Orleans, LA, 167p.
LAHIERE, L., 1982. Petrology of lacustrine deposits, Juchipila quadrangle, Zacatecas, Mexico. Unpublished MS thesis, University of New Orleans, New Orleans, LA, 85p.
LANPHERE, M. A., K. L. CAMERON and M. CAMERON, 1980. Sr isotopic geochemistry and voluminous rhyolitic ignimbrites and related rocks, Batopilas area, western Mexico. Nature, 286, 594-595. DOI: https://doi.org/10.1038/286594a0
LeBAS, M. J., R. W. LeMAITRE, A. STRECKEISEN and B. ZANETTIN, 1986. A chemical classification of the volcanic rocks based on the total alkali-silica diagram. J. Petrology, 27, 745-750. DOI: https://doi.org/10.1093/petrology/27.3.745
LOPEZ, J. C., 1991. Stratigraphy and petrology of Miocene-Pliocene lacustrine deposits, Juchipila quadrangle, Zacatecas, Mexico. Unpublished MS thesis, University of New Orleans, New Orleans, LA, 219p.
McDOWELL, F. W. and S. E. CLABAUGH, 1979. Ignimbrites of the Sierra Madre Occidental and their relation to the tectonic history of western Mexico. Geological Society of America, Special Paper 180, 113-124. DOI: https://doi.org/10.1130/SPE180-p113
McDOWELL, F. W. and R. P. KEIZER, 1977. Timing of mid-Tertiary volcanism in the Sierra Madre Occidental between Durango City and Mazatlan, Mexico. Geological Society of America Bulletin, 88, 1479-1487. DOI: https://doi.org/10.1130/0016-7606(1977)88<1479:TOMVIT>2.0.CO;2
MOLL, E. J., 1981. Geochemistry and petrology of a mid-Tertiary ash-flow tuff from the Sierra El Virulento area, southeastern Chihuahua, Mexico. J. Geophys. Res., 86, 10321-10334. DOI: https://doi.org/10.1029/JB086iB11p10321
MONTAGUE, K. A., 1992. Petrology and geochemistry of rhyolitic ash-flow tuffs, Juchipila, Zacatecas, Mexico. Unpublished MS thesis, University of New Orleans, New Orleans, LA, 181p.
NAKAMURA, N., 1974. Determination of REE, Ba, Fe, Mg, Na and K in carbonaceous and ordinary chondrites. Geochim. Cosmochim. Acta, 38, 757-775. DOI: https://doi.org/10.1016/0016-7037(74)90149-5
NELSON, S. A., and R. A. LIVIERES, 1986. Contemporaneous calc-alkaline and alkaline volcanism at Sanganguey Volcano, Nayarit, Mexico. Geological Society of America Bulletin, 97, 798-808. DOI: https://doi.org/10.1130/0016-7606(1986)97<798:CCAAVA>2.0.CO;2
ROESLER, T. A., 1987. The structure and stratigraphy of a part of the Tepechitlan quadrangle, Zacatecas, Mexico. Unpublished MS thesis, University of New Orleans, New Orleans, LA, 133p.
RUIZ, J., P. J. PATCHETT and R. J. ARCULUS, 1988. Nd-Sr isotopic composition of lower crustal xenoliths -Evidence for the origin of mid-Tertiary felsic volcanics in Mexico. Contributions to Mineralogy and Petrology, 99, 36-43. DOI: https://doi.org/10.1007/BF00399363
SEDLOCK, R. L., F. ORTEGA-GUTIERREZ and R. C. SPEED, 1993. Tectonostratigraphic Terranes and Tectonic Evolution of Mexico. Geological Society of America Special Paper 278, 153p. DOI: https://doi.org/10.1130/SPE278-p1
SIMMONS, Wm. B., M. T. LEE and R. H. BREWSTER, 1987. Geochemistry and evolution of the South Platte granite-pegmatite system, Jefferson County, Colorado. Geochim. Cosmochim. Acta, 51, 455-471. DOI: https://doi.org/10.1016/0016-7037(87)90061-5