Gregory D. Harper (Ph.D, 1980, University of California, Berkeley)

Emeritus Professor - Greg Harper resigned from the University  in December 2004.

Greg in Ingals Ophiolite - link to 36K .jpgMy research program  emphasized regional geology and tectonic evolution of Jurassic rocks of the western U.S., as deduced from field, geochemical structural, stratigraphic, and geochronologic data.  Much research has focused on ancient ocean crust (ophiolites) in California, Washington, northern Italy, and Wyoming.  I also participated in Leg 148 of the Ocean Drilling Program, which involved deepening the deepest drill hole in ocean crust.  Former research emphasized hydrothermal metamorphism and mineralization in ophiolites; this includes oceanic serpentinization and the recognition of the paleo-Moho in ophiolites.

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Graduate students supervised by Professor G.D. Harper at the University at Albany

Selected References:

Harper, G.D., 2003. Fe-Ti basalts in the Josephine ophiolite and propagating ridge tectonics, Klamath Mountains, California-Oregon.  Geol. Soc. Amer. Bull., 115, 771-787.

Metzger, E., Harper, G.D., and Miller, R.B., 2002. Geochemistry and tectonic setting of the ophiolitic Ingalls Complex, North Cascades, Washington: Implications for correlations of Jurassic Cordilleran ophiolites.  J. Geol., 110, 543-560.

Harper, G.D., 1999. Structural styles of hydrothermal discharge in ophiolite/seafloor systems, pp. 53-73 (Chap. 3) in Barrie, C.T., and Hannington, M.D. (eds.), Volcanic Associated Massive Sulfide Deposits:  Reviews in Economic Geology 8, Society of Economic Geologists.

Sylvester, P., Harper, G.D., Byerley, G., and Thurston, P.C., 1997. Volcanic rocks in Archean greenstone belts, pp. 55-90 in DeWit, M.J., and Ashwal, L. (eds.), Greenstone Belts. Oxford Scientific Pub., Clarendon Press, Oxford.

Harper, G.D., Grady, K., and Coulton, A.J., 1996. Origin of the amphibolite "sole" of the Josephine Ophiolite: emplacement of a cold ophiolite over a hot arc. Tectonics, 15, 296-313.

Dilek, Y., Harper, G.D., Pezard, P., and Tartarotti, P., 1996. Structure of the sheeted dike complex in Hole 504B (Leg 148). pp.229-244 in Alt, J.C., (eds), Proc. Ocean Drilling Prog., Sci. Results, 148. Ocean Drilling Program, College Station, Texas.

Harper, G.D., 1995. Pumpellyosite and prehnitite associated with epidosite in the Josephine ophiolite-Ca metasomatism during upwelling of hydrothermal fluids at a spreading axis, pp.101-122 in Schiffman, P., and Day., H.(eds.), Low Grade Metamorphism of Basic Rocks: Geol. Soc. Am. Spec. Paper 296.

Coulton, A.J., Harper, G.D., and O'Hanley, D.S., 1995. Oceanic versus emplacement-age serpentinization in the Josephine Ophiolite: implications for the nature of the Moho at intermediate and slow-spreading ridges. J. Geophys. Res., 100, 22,245-22,260.

Harper, G.D., Saleeby, J.B., and Heizler, M., 1994. Formation and Emplacement of the Josephine ophiolite and the age of the Nevadan orogeny in the Klamath Mountains, California-Oregon: U/Pb zircon and 40Ar/39Ar geochronology: J. Geophys. Res., 99, 4293-4321.

Alexander, R., Harper, G.D., and Bowman, J.R., 1993. Oceanic faulting and fault-controlled subseafloor hydrothermal alteration in the sheeted dike complex of the Josephine ophiolite: J. Geophysical Res., 98, 9731-9759.

Alexander, R., and Harper, G.D., 1992. The Josephine ophiolite, an ancient analog for oceanic lithosphere formed at slow/intermediate spreading centers, pp. 3-38 in Ophiolites and their Modern Oceanic Analogues, B. Parsons and P. Browning (eds), J. Geol. Soc. London Spec. Pub. 60.

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