James T. Gutmann
Professional ActivityJim Gutmann taught physical geology, mineralogy, volcanology, and igneous and metamorphic petrology at Wesleyan University. He has retired from teaching but continues decades of research on the Pinacate Biosphere Reserve in Sonora, Mexico, an area that is now a UNESCO World Heritage Site. Ongoing projects there include the age of Pinacate volcanism and the geochemistry and origin of Pinacate volcanic activity. This Web SiteThe purpose of this web site is to post some Pinacate geologic images that may be of interest to others. References to many JTG publications on Pinacate geology are also provided below all the thumbnails. Photographs of the PinacateThe
Pinacate volcanic field from an orbital spacecraft
Click on the twenty-one pictures below to see larger images Selected publications on the Pinacate Volcanic FieldGutmann, J.T., 1974, Tubular voids within labradorite phenocrysts from Sonora, Mexico: American Mineralogist, v.59, p. 666-672. Gutmann, J.T., and Martin, R.F., 1976, Crystal chemistry, unit cell dimensions, and structural state of labradorite megacrysts from Sonora, Mexico: Schweiz . Mineral . Petrogr. Mitt., v. 56, p. 55-64. Gutmann, J.T., 1976, Geology of Crater Elegante, Sonora, Mexico: Geol. Soc. America Bull., v. 87, 1718-1729. Gutmann, J.T., 1977, Textures and genesis of phenocrysts and megacrysts in basaltic lavas from the Pinacate volcanic field: Am. Jour. Science., v. 277, p. 833-861. Gutmann, J.T. and Sheridan, M.F., 1978, Geology of the Pinacate volcanic field, Sonora, Mexico: Arizona Bureau of Geology and Mineral Technology Special Paper 2, p. 47-59. Gutmann, J.T., 1979, Structure and eruptive cycle of cinder cones in the Pinacate volcanic field and the controls of Strombolian activity: Jour. Geol., v. 87, p. 448-454. Gutmann, J.T., 1986, Origin of four- and five-phase ultramafic xenoliths from Sonora, Mexico: American Mineralogist, v. 71, p. 1076-1084. Lynch, D.J., and Gutmann, J.T., 1987, Volcanic structures and alkaline rocks in the Pinacate volcanic field of Sonora, Mexico: in Davis, G.H., and VandenDolder, E.M., eds., Geologic Diversity of Arizona and its Margins, Arizona Bureau of Geology and Mineral Technology Special Paper 5, p. 309-322. Lutz, T.M., Zhang, D., and Gutmann, J.T., 1989, Statistical analysis of vent locations in the Pinacate volcanic field, Sonora, Mexico: order within apparent chaos: Geol. Soc. America Abstr. Programs, v. 21, p. A206. Lynch, D.J., Musselman, T.E., Gutmann, J.T., and Patchett, P.J., 1993, Isotopic evidence for the origin of Cenozoic volcanic rocks in the Pinacate volcanic field, northwestern Mexico: Lithos, v. 29, p. 295-302. Gutmann, J.T., and Lutz, T.M., 1993, Middle Pleistocene shift in the pattern of vent distribution, Pinacate volcanic field, Sonora, Mexico: Geol. Soc. America Abstr. Programs, v. 25, p. A-267. Lutz, T.M., and Gutmann, J.T., 1995, An improved method for determining and characterizing alignments of pointlike features and its implications for the Pinacate volcanic field, Sonora, Mexico: Journal of Geophysical Research, v. 100, p. 17659-17670. Gutmann, J. T., and Prival, D. B., 1996, Strombolian and hydromagmatic volcanism in the Pinacate volcanic field: Geol. Soc. America Abstr. Programs, v. 28, p. A-503. Bezy, J. V., Gutmann, J. T., and Haxel, G. B., 2000, A Guide to the Geology of Organ Pipe Cactus National Monument and the Pinacate Biosphere Reserve: Arizona Geological Survey, Down-to-Earth Series No.9, 63 pp. Gutmann, J.T., Turrin, B.D., and Dohrenwend, J.C., 2000, Basaltic rocks from the Pinacate volcanic field yield notably young 40Ar/39Ar ages: Eos, Transactions, American Geophysical Union, v. 81, p. 33-37. Gutmann, J.T., 2002,Strombolian and effusive activity as precursors to phreatomagmatism: eruptive sequence at maars of the Pinacate volcanic field, Sonora, Mexico: Journal of Volcanology and Geothermal Research, v. 113, p. 345-356. Gutmann, J. T., and Turrin, B. D., 2006, The age of Crater Elegante, a maar in the Pinacate volcanic field, Sonora, Mexico: Geol. Soc. America Abstr. Programs, v. 38, no. 6, p. 32. Gutmann, J. T., 2007, Geologic studies in the Pinacate volcanic field: Journal of the Southwest, v. 49, no. 2, p. 189-243. Turrin, B. D., Gutmann, J. T., and Swisher, C. C. III, 2008, A 13 ± 3 ka age determination of a tholeiite, Pinacate volcanic field, Mexico, and improved methods for 40Ar/39Ar dating of young basaltic rocks: Journal of Volcanology and Geothermal Research, v. 177, p.848-856. Goss, A.R., Gutmann, J.T., Varekamp, J.C., and Kamenov, G., 2008, Pb isotopes and trace elements of the Pinacate volcanic field, northwestern Sonora, Mexico: a Basin and Range mini-plume near the EPR Spreading Center: Geol. Soc. America Abstr. Programs, v. 40, no. 6, p.530. Goss, A.R., Gutmann, J.T., and Kamenov, G.D., 2009, A compositionally stratified mantle below the northern Mexican Basin and Range: trace elements and isotopic evidence from mantle xenoliths from the Pinacate volcanic field, Sonora, Mexico: Geol. Soc. America Abstr. Programs, v. 41, no. 7, p. 137 Gutmann, J.T., 2011, Estudios geológicos en el campo volcánico de El Pinacate: Calmus, T., ed., Publicaciones Ocasionales No. 5, Universidad Nacional Autónoma de México, Instituto de Geología, Estación Regional del Noroeste, 51 pp. |