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Progressive assembly of a massive layer of ignimbrite with a normal-to-reverse compositional zoning: the Zaragoza ignimbrite of central Mexico

Bulletin of Volcanology volume 68, Article number: 3 (2005) Cite this article

Abstract

The Zaragoza ignimbrite and two enclosing rhyodacite pumice fall layers were emplaced during the 15 km3 (DRE), ∼0.1 Ma Zaragoza eruption from Los Humeros volcanic centre, 180 km east of Mexico City. The ignimbrite comprises several massive flow-units, the largest of which locally exceeds 20 m in thickness and is regionally traceable. It comprises massive lapilli-ash with vertical elutriation pipes, and has a fine-grained inverse-graded base and a pumice concentration zone at the top. It also exhibits an unusual gradational ‘double’ vertical compositional zonation that is widely traceable. A basal rhyodacitic (67.6–69 wt% SiO2) zone grades up via a mixed zone into a central andesitic (58–62 wt% SiO2) zone, which, in turn, grades up into an upper rhyodacitic (67.6–69 wt% SiO2) zone. Zoning is also defined by vertical variations in lithic clast populations. We infer that pyroclastic fountaining fed initially rhyodacite pumice clasts to a sustained granular fluid-based pyroclastic density current. The composition of the pumice clasts supplied to the current then gradually changed, first to andesite and then back to rhyodacite. Inverse grading at the base of the massive layer may reflect initial waxing flow competence. The pumice concentration at the top of the massive layer is entirely rhyodacitic and was probably deposited during waning stages of the current, when the supply of andesitic pumice clasts had ceased. The return to rhyodacitic composition may have been the result of eruption-conduit modification during collapse of Los Potreros caldera, marked in the ignimbrite by a widespread influx of hydrothermally altered lithic blocks, and/or a decrease in draw-up depth from a compositionally stratified magma chamber as the eruptive mass flux waned. The massive layer of ignimbrite thins locally to less than 2 m, yet it still shows the double zonation. Correlation of the zoning suggests that the thin massive layer is stratigraphically condensed, and aggraded relatively slowly during the same time interval as did the much thicker (≤50 m) massive layer.

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References

  • Bacon CR, Druitt TH (1988) Compositional evolution of the zoned, calc-alkaline magma chamber of Mount Mazama, Crater Lake, Oregon. Contrib Mineral Petrol 76:53–59

    Google Scholar 

  • Blake S, Ivey GN (1986) Magma-mixing and the dynamics of withdrawal from stratified reservoirs. J Volcanol Geotherm Res 27:153–178

    Article  Google Scholar 

  • Blake S, Ivey GN (1988) Density and viscosity gradients on zoned magma chambers, and their influence on withdrawal dynamics. J Volcanol Geotherm Res 30:200–229

    Google Scholar 

  • Branney MJ, Kokelaar BP (1992) A reappraisal of ignimbrite emplacement: progressive aggradation and changes from particulate to non-particulate flow during emplacement of high-grade ignimbrite. Bull Volcanol 54:504–520

    Article  Google Scholar 

  • Branney MJ, Kokelaar BP (1997) Giant bed from a sustained catastrophic density current flowing over topography: Acatlán ignimbrite, Mexico. Geology 25:115–118

    Article  Google Scholar 

  • Branney MJ, Kokelaar BP (2002) Pyroclastic density currents and the sedimentation of ignimbrites. Geol Soc Lond Mem 27:1–152

    Google Scholar 

  • Brown RJ, Branney MJ (2004) Bypassing and diachronous deposition from density currents: evidence from a giant regressive bedform in the Poris ignimbrite, Tenerife, Canary Islands. Geology 32:445–448

    Article  Google Scholar 

  • Brown RJ, Barry TL, Branney MJ, Pringle MS, Bryan SE (2003) The Quaternary pyroclastic succession of southeast Tenerife, Canary Islands: explosive eruptions, related subsidence and sector collapse. Geol Mag 140:265–288

    Article  Google Scholar 

  • Bursik MI, Woods AW (1996) The dynamics and thermodynamics of large ash flows. Bull Volcanol 58:175–193

    Article  Google Scholar 

  • Cedillo F (1997) Geología del subsuelo del campo geotérmico de Los Humeros, Pue., Unpublished internal report, Comisión Federal de Electricidad, Mexico, pp 1–30

    Google Scholar 

  • Cedillo F (1999) Modelo hidrogeológico de los yacimientos geotérmicos de Los Humeros, Pue., Mexico. Geotermia, Rev Mex Geoenergía 15–3:159–170

    Google Scholar 

  • Choux CM, Druitt TH (2002) Analogue study of particle segregation in pyroclastic density currents, with implications for the emplacement mechanisms of large ignimbrites. Sedimentology 49:907–928

    Article  Google Scholar 

  • Cox KG, Bell JD, Pankhurst RJ (1979) The interpretation of igneous rocks. Allen and Unwin, London, pp 1–449

  • de Silva SL (1991) Styles of zoning in central Andean ignimbrite; insights into magma chamber processes. In: Harmon RS, Rapela CW (eds) Andean magmatism and its tectonic setting. Geol Soc Am Spec Pap 265:217–232

    Google Scholar 

  • Druitt TH (1995) Settling behaviour of concentrated dispersions and some volcanological applications. J Volcanol Geotherm Res 65:27–39

    Article  Google Scholar 

  • Druitt TH, Edwards L, Mellors RA, Pyle DM, Sparks RSJ, Lanphere M, Davies M, Barriero B (1999) Santorini volcano. Geol Soc Lond Mem 19: 1–165

    Article  Google Scholar 

  • Ferriz H, Mahood G (1984) Eruptive rates and compositional trends at Los Humeros volcanic center, Puebla, Mexico. J Geophys Res 89:8511–8524

    Article  Google Scholar 

  • Ferriz H, Mahood G (1987) Strong compositional zonation in a silicic magmatic system: Los Humeros, Mexican Neovolcanic Belt. J Petrol 28:171–209

    Google Scholar 

  • Fisher RV (1966) Mechanism of deposition from pyroclastic flows. Am J Sci 264:350–363

    Google Scholar 

  • Fisher RV (1990) Transport and deposition of a pyroclastic surge across an area of high relief—the 18 May 1980 eruption of Mount St. Helens, Washington. Bull Geol Soc Am 102:1038–1054

    Article  Google Scholar 

  • Freundt A, Schmincke H-U (1992) Mixing of rhyolite, trachyte and basalt magma erupted from a vertically and laterally zoned reservoir, composite flow P1, Gran Canaria. Contrib Mineral Petrol 112:1–19

    Article  Google Scholar 

  • Freundt A, Schmincke H-U (1995) Eruption and emplacement of a basaltic welded ignimbrite during caldera formation on Gran Canaria. Bull Volcanol 56:640–659

    Google Scholar 

  • Giannetti B, Luhr JF (1983) The White Trachytic Tuff of Roccamonfina volcano, Italy. Contrib Mineral Petrol 84:235–252

    Article  Google Scholar 

  • Hand BM (1997) Inverse grading resulting from coarse-sediment transport lag. J Sediment Res 67:124–129

    Article  Google Scholar 

  • Hildreth W (1979) The Bishop Tuff: evidence for the origin of compositional zonation in silicic magma chambers. In: Chapin CE, Elston WE (eds) Ash-flow tuffs. Geol Soc Am Spec Pap 180, pp43–84

  • Hildreth W (1983) The compositionally zoned eruption of 1912 in the Valley of Ten Thousand Smokes, Katmai National Park, Alaska. J Volcanol Geotherm Res 18:1–56

    Article  Google Scholar 

  • Hildreth W, Mahood GA (1986) Ring-fracture eruption of the Bishop Tuff. Geol Soc Am Bull 97:396–403

    Article  Google Scholar 

  • Inman DL (1952) Measures for describing the size distribution of sediments. J Sediment Petrol 22:125–45

    Google Scholar 

  • Kneller BC, Branney MJ (1995) Sustained high-density turbidity currents and the deposition of massive sands. Sedimentology 42:607–616

    Article  Google Scholar 

  • Lipman PW (1967) Mineral and chemical variations within an ash-flow sheet from Aso caldera southwestern Japan. Contrib Mineral Petrol 16:300–327

    Article  Google Scholar 

  • Riggs N, Carrasco-Núñez G (2004) Evolution of a complex, isolated dome system, Cerro Pizarro, Central Mexico. Bull Volcanol 66:322–335

    Article  Google Scholar 

  • Siebert L, Carrasco-Núñez G (2002) Late-Pleistocene to pre-Columbian behind-the-arc mafic volcanism in the eastern Mexican Volcanic Belt; implications for future hazards. J Volcanol Geotherm Res 115:179–205

    Article  Google Scholar 

  • Smith RL, Bailey RA (1966) The Bandelier Tuff: a study of ash-flow eruption cycles from zoned magma chambers. Bull Volcanol 29:83–103

    Article  Google Scholar 

  • Sparks RSJ (1976) Grain size variations in ignimbrites and implications for the transport of pyroclastic flows. Sedimentology 23:147–188

    Article  Google Scholar 

  • Sumner JS, Branney MJ (2002) The emplacement history of a remarkable heterogeneous, compositionally zoned, rheomorphic and locally lava-like rheomorphic ignimbrite: ‘TL’ on Gran Canaria. J Volcanol Geotherm Res 115:109–138

    Article  Google Scholar 

  • Sumner JS, Wolff J (2003) Petrogenesis of mixed-magma, high-grade, peralkaline ignimbrite ‘TL’ (Gran Canaria): diverse styles of mixing in a replenished, zoned magma chamber. J Volcanol Geotherm Res 126:109–126

    Article  Google Scholar 

  • Turner JS (1980) A fluid-dynamical model of differentiation and layering in magma chambers. Nature 185:213–215

    Article  Google Scholar 

  • Viniegra F (1965) Geología del Macizo de TeZaragoza Ignimbriteutlán y la Cuenca Cenozoica de Veracruz. Bol As Mexicana Geólog Petrol 17:101–163

    Google Scholar 

  • Vrolijk PJ, Southard JB (1998) Experiments on rapid deposition of sand from high-velocity flows. Geosci Can 24:45–54

    Google Scholar 

  • Wilson CJN (1984) The role of fluidization in the emplacement of pyroclastic flows 2. Experimental results and their interpretation. J Volcanol Geotherm Res 20:55–84

    Article  Google Scholar 

  • Wilson CJN, Hildreth W (1997) The Bishop Tuff: new insights from eruptive stratigraphy. J Geol 105:407–439

    Google Scholar 

  • Winchester JA, Floyd PA (1977) Geochemical discrimination of different magmas series and their differentiation products using immobile elements. Chem Geol 20:325–343

    Article  Google Scholar 

  • Wolff JA, Storey M (1984) Zoning of highly alkaline magma bodies. Geol Mag 121:563–575

    Article  Google Scholar 

  • Wright JV, Walker GLP (1977) The ignimbrite source problem: a co-ignimbrite lag-fall deposit from a major Quaternary Mexican eruption. Bull Volcanol 44:189–212

    Article  Google Scholar 

  • Wright JV, Walker GLP (1981) Eruption, transport and deposition of ignimbrite: a case study from Mexico. J Volcanol Geotherm Res 9:11–131

    Article  Google Scholar 

  • Yáñez C, García S (1982) Exploración de la región geotérmica Los Humeros-Las Derrumbadas, estados Puebla y Veracruz, vol 29, CFE, México, pp 1–98

    Google Scholar 

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Acknowledgements

This work was supported by CONACYT 27553-T and PAPIIT IN104401 Grants to GCN. Claudia Romero and Andrea Rossotti helped with the component analysis. Patricia Girón and Rufino Lozano with the chemistry, and Bartolo Rodríguez with the sieving. Vern Manville provided comments on the first version of the manuscript. Special thanks to referees Armin Freundt and Jocelyn McPhie for detailed comments that led to significant improvements of the paper. High-quality thin sections were made by Juan Vázquez. Logistical support was provided by Dante Morán, former director of the Institute of Geology at UNAM, and by Luca Ferrari, current director of Centro de Geociencias

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Authors and Affiliations

  1. Centro de Geociencias, Campus Juriquilla, UNAM, Apdo. Postal 1-742, Querétaro, Qro., 76001, Mexico

    Gerardo Carrasco-Núñez

  2. Department of Geology, University of Leicester, Leicester LE1 7RH, England, UK

    Michael J. Branney

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  1. Gerardo Carrasco-Núñez
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  2. Michael J. Branney
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Correspondence to Gerardo Carrasco-Núñez.

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Editorial responsibility: J McPhie

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Carrasco-Núñez, G., Branney, M.J. Progressive assembly of a massive layer of ignimbrite with a normal-to-reverse compositional zoning: the Zaragoza ignimbrite of central Mexico. Bull Volcanol 68, 3 (2005). https://doi.org/10.1007/s00445-005-0416-8

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Keywords

  • Ignimbrite
  • Massive beds
  • Compositional zoning
  • Explosive eruption
  • Los Humeros
  • Pumice
  • Grading
  • Density current