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Chemical and thermal zonation in a mildly alkaline magma system Infiernito Caldera, Trans-Pecos Texas

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Abstract

Postcollapse lavas of the Infiernito caldera grade stratigraphically upward from nearly aphyric, high-silica rhyolite (76% SiO2) to highly prophyritic trachyte (62% SiO2). Plagioclase, clinopyroxene, orthopyroxene, magnetite, ilmenite, and apatite occur as phenocrysts throughout the sequence. Sanidine, biotite, and zircon are present in rocks with more than about 67% SiO2. Major and trace elements show continuous variations from 62 to 76% SiO2. Modeling supports fractional crystallization of the observed phenocrysts as the dominant process in generating the chemical variation.

Temperatures calculated from coexisting feldspars, pyroxenes, and Fe-Ti oxides agree and indicate crystallization from slightly more than 1100° C in the most mafic trachyte to 800° C in high-silica rhyolite. The compositional zonation probably arose through crystallization against the chilled margin of the magma chamber and consequent rise of more evolved and therefore less dense liquid.

Mineral compositions vary regularly with rock composition, but also suggest minor mixing and assimilation of wall rock or fluids derived from wall rock. Mixing between liquids of slightly different compositions is indicated by different compositions of individual pyroxene phenocrysts in single samples. Liquid-solid mixing is indicated by mineral compositions of glomerocrysts and some phenocrysts that apparently crystallized in generally more evolved liquids at lower temperature and higher oxygen fugacity than represented by the rocks in which they now reside. Glomerocrysts probably crystallized against the chilled margin of the magma chamber and were torn from the wall as the liquid rose during progressive stages of eruption. Assimilation is indicated by rise of oxygen fugacity relative to a buffer from more mafic to more silicic rocks.

Calculation of density and viscosity from the compositional and mineralogical data indicates that the magma chamber was stably stratified; lower temperature but more evolved, thus less dense, rhyolite overlay higher temperature, less evolved, and therefore more dense, progressively more mafic liquids. The continuity in rock and mineral compositions and calculated temperature, viscosity, and density indicate that compositional gradation in the magma chamber was smoothly continuous; any compositional gaps must have been no greater than about 2% SiO2.

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References

  1. Anderson DJ, Lindsley DH (1985) New (and final) models for the Ti-magnetite/ilmenite geothermometer and oxygen barometer. Eos 66:416

  2. Arth JG (1976) Behavior of trace elements during magmatic process-a summary of theoretical models and their applications. J Res US Geol Sur 4:41–47

  3. Bacon CR (1986) Magmatic inclusions in silicic and intermediate volcanic rocks. J Geophys Res 91:6091–6112

  4. Barker DS (1977) Northern Trans-Pecos magmatic province: introduction and comparison with the Kenya rift. Geol Soc Am Bull 88:1421–1427

  5. Berlin R, Henderson CMB (1969) The distribution of Sr and Ba between the alkali feldspar, plagioclase and groundmass phases of porphyritic trachytes and phonolites. Geochim Cosmochim Acta 33:247–255

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

  7. Blake S, Ivey GN (1986b) Density and viscosity gradients in zoned magma chambers, and their influence on withdrawal dynamics. J Volcanol Geotherm Res 30:201–230

  8. Bottinga YA, Weill DF (1970) Densities of liquid silicate systems calculated from partial molar volumes of oxide components Am J Sci 269:169–182

  9. Buddington AF, Lindsley DH (1964) Iron-titanium oxide minerals and synthetic equivalents. J Petrol 5:310–357

  10. Candela PA (1986) The evolution of aqueous vapor from silicate melts: effect on oxygen fugacity. Geochim Cosmochim Acta 50:1205–1211

  11. Carmichael ISE, Turner FJ, Verhoogen J (1974) Igneous petrology, McGraw-Hill, New York, 739 p

  12. Crecraft HR, Nash JP, Evans SR (1981) Late Cenozoic volcanism at Twin Peaks, Utah: geology and petrology. J Geophys Res 86:10303–10320

  13. Czamanske GK, Mihalik P (1972) Oxidation during magmatic differentiation, Finnmarka Complex, Oslo area, Norway: part 1) the opaque oxides. J Petrol 13:493–509

  14. Czamanske GK, Wones DR (1973) Oxidation during magmatic differentiation, Finnmarka Complex, Oslo area, Norway: part 2) the mafic silicates. J Petrol 14:349–380

  15. Davidson PM, Lindsley DH (1985) Thermodynamic analysis of quadrilateral pyroxenes, Part II: model calibration from experiments and applications to geothermometry. Contrib Mineral Petrol 91:390–404

  16. Fridrich CJ, Mahood GA (1987) Compositional layers in the zoned magma chamber of the Grizzly Peak Tuff. Geology 15:299–303

  17. Ghiorso MS (1984) Activity/composition relations in the ternary feldspars. Contrib Mineral Petrol 87:282–296

  18. Ghiorso MS, Carmichael ISE, Rivers ML, Sack RO (1983) The Gibbs free energy of mixing of natural silicate liquids: an expanded regular solution approximation for the calculation of magmatic intensive variables. Contrib Mineral Petrol 84:107–145

  19. Greenland LP (1970) An equation for trace element distribution during magmatic crystallization. Am Mineral 55:455–465

  20. Hanson GN (1978) The application of trace elements to the petrogenesis of igneous rocks of granitic composition. Earth Planet Sci Lett 38:26–43

  21. Henry CD, McDowell FW (1986) Geochronology of the mid-Tertiary volcanic field, Trans-Pecos Texas. In: Price JG, Henry CD, Parker DF, Barker DS (eds) Igneous geology of Trans-Pecos Texas. Univ Texas Bur Econ Geol Guidebook 23:99–122

  22. Henry CD, Price JG (1984) Variations in caldera development in the Tertiary volcanic field of Trans-Pecos Texas. J Geophys Res 89:8765–8786

  23. Henry CD, McDowell FW, Price JG, Smyth RC (1986) Compilation of potassium-argon ages of Tertiary igneous rocks, TransPecos Texas. Univ Texas Bur Econ Geol Geological Circular 86–2 34 p

  24. 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 180:43–75

  25. Hildreth W, Grove TL, Dungan MA (1986) Introduction to special section on open magmatic systems. J Geophys Res 91:5887–5889

  26. Huppert HE, Sparks RSJ (1984) Double-diffusive convection due to crystallization in magmas. Ann Rev Earth Plant Sci 12:11–37

  27. Huppert HE, Sparks RSJ, Wilson JR, Hallworth MA (1986) Cooling and crystallization at an inclined plane. Earth Planet Sci Lett 79:319–328

  28. Leeman WP, Phelps DW (1981) Partitioning of rare earths and other trace elements between sanidine and coexisting volcanic glass. J Geophys Res 86:10193–10199

  29. Le Maitre RW (1981) GENMIX-A generalized petrological mixing model program. Computers Geosci 7:229–247

  30. Lindsley DH (1983) Pyroxene thermometry. Am Mineral 68:477–493

  31. Long PE (1978) Experimental determination of partition coefficients for Rb, Sr, and Ba between alkali feldspar and silicate liquid. Geochim Cosmochim Act 42:833–846

  32. Mahood G, Hildreth W (1983) Large partition coefficients for trace elements in high-silica rhyolites. Geochim Cosmochim Acta 47:11–30

  33. Marsh BD (1986) Convection and crystallization of lava lakes. Geol Soc Am 18:682

  34. McBirney AR (1980) Mixing and unmixing of magmas. J Volcan Geotherm Res 7:357–371

  35. McBirney Ar (1985) Igneous petrology, San Francisco, Freeman, Cooper and Company, 504 p

  36. McBirney AR, Baker BH, Nilson RH (1985) Liquid fractionation. Part 1: Basic principles and experimental simulations. J Volcanol Geotherm Res 24:1–24

  37. Murase T, McBirney AR (1973) The properties of some common igneous rocks and their melts at high temperatures. Geol Soc Am Bull 84:3563–3592

  38. Nash WP, Crecraft HR (1985) Partition coefficients for trace elements in silicic magmas. Geochim Cosmochim Acta 49:2309–2322

  39. Noble DC (1985) Modeling fractionation and mixing processes on microcomputer spreadsheets. Geology 13:443

  40. Noble DC, Smith C, Peck LC (1967) Loss of halogens from crystallized and glassy silicic volcanic rocks. Geochim Cosmochim Acta 31:215–223

  41. Price JG (1985) Ideal site mixing in solid solutions, with an application to two-feldspar geothermometry. Am Mineral 70:696–701

  42. Price JG, Henry CD (1984) Stress orientations during Oligocene volcanism in Trans-Pecos Texas: timing the transition from Laramide compression to Basin and Range extension. Geol 12:238–241

  43. Price JG, Henry CD, Barker DS, Parker DF (1987) Alkalic rocks of contrasting tectonic settings in Trans-Pecos Texas. In: Morris EM, Paster JD (eds) Geol Soc Am Sp Pap 215:335–346

  44. Sato M, Wright TL (1966) Oxygen fugacities directly measured in volcanic gases. Science 153:1103–1105

  45. Sakuyama MA (1981) Petrological study of the Myoko and Kurohime volcanoes, Japan: crystallization sequence and evidence for magma mixing. J Petrol 22:553–583

  46. Seck HA (1971) Koexistierende Alkalifeldspate und Plagioklase im System NaAlSi3O8-KAlSi3O8-CaAlSi2O8-H2O bei Temperaturen von 650° C bis 900° C. Neues Jahr Min Abhand 115:315–345

  47. Shaw HR (1972) Viscosities of magmatic silicate liquids: an empirical method of prediction. Am Jour of Sci 272:870–893

  48. Sparks RSJ, Huppert HE, Turner JS (1984) The fluid dynamics of evolving magma chambers. Philos Trans R Soc Lond Ser A 310:511–534

  49. Spencer KJ, Lindsley DH (1981) A solution model for coexisting iron-titanium oxides. Am Mineral 66:1189–1201

  50. Stormer JC (1983) The effects of recalculation on estimates of temperature and oxygen fugacity from analyses of multicomponent iron-titanium oxides: Am Mineral 68:586–594

  51. Turner JS, Campbell IH (1986) Convection and mixing in magma chambers. Earth Sci Rev 23:255–352

  52. Walker GPL (1973) Lengths of lava flows. Philos Trans R Soc Lond A 274:107–118

  53. Watson EB, Green TH (1981) Apatite/liquid partition coefficients for the rare earth elements and strontium. Earth Planet Sci Lett 56:405–421

  54. Wright JV (1981) The Rio Caliente ignimbrite: analysis of a compound intraplinian ignimbrite from a major late Quaternary Mexican eruption. Bull Volcanol 44:189–212

  55. Wright TL, Doherty PC (1970) A linear programming and least squares computer method for solving petrologic mixing programs. Geol Soc Am Bull 81:1995–2008

  56. Zielinski RA, Lipman PW, Millard HT (1977) Minor-element abundances in obsidian, perlite, and felsite of calc-alkalic rhyolites. Am Mineral 62:426–437

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Correspondence to Christopher D. Henry.

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Henry, C.D., Price, J.G. & Smyth, R.C. Chemical and thermal zonation in a mildly alkaline magma system Infiernito Caldera, Trans-Pecos Texas. Contrib Mineral Petrol 98, 194–211 (1988). https://doi.org/10.1007/BF00402112

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Keywords

  • SiO2
  • Magnetite
  • Apatite
  • Ilmenite
  • Mineral Composition