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Geoffrey S. Pignotta

 pignotta_1

Geoffrey S. Pignotta

Field Geology Coordinator
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Education

 
  • B.Sc. Honors, University of Ottawa, Ottawa, Ontario, 1998
  • Ph.D., University of Southern California, Los Angeles, California, 2006
 

Courses

 
  • Geology of Our National Parks and Monuments
  • Physical Geology
  • Computers in Geology
  • Field Geology I (three-week field camp course in New Mexico)
  • Field Geology II (three-week field camp course in Montana)
 

Research Interests/Current Projects

 

My specialization is structural geology and my research interests revolve around the dynamics of magmatic systems and the construction and evolution of continental margin magmatic arcs and orogenic belts. The main focus of my recent research has been the Sierra Nevada batholith, CA, but I am actively pursuing research projects in the North American Cordillera from Baja, Mexico to British Columbia, Canada. My research goals for the immediate future include continuing research in the Jackass Lakes pluton, a very unique magmatic system in the Sierra Nevada Batholith which has numerous potential undergraduate research projects related to magma chamber evolution, emplacement problems, magmatic fabric development, and the structural evolution of its metavolcanic host rock. Please see my Research Page for more details on previous and active research projects.

My research involves field mapping at a variety of scales and subsequent compilation of maps and data using GIS software. This is complimented by quantitative structural/strain analyses, petrography (structural, igneous, metamorphic, and reflected light), digital image analysis, rock magnetic techniques (including paleomagnetic and anisotropy of magnetic susceptibility), geochemistry, geochronology, thermobarometry and finite difference (1-D and 2-D) thermal-mechanical modeling.

 

Publications

 

Journal Articles

 

Pignotta, G.S. and Paterson, S.R., 2007, Voluminous stoping in the Mitchell Intrusive Suite, Sierra Nevada batholith, California. Canadian Mineralogist, v.45, pp. 87-106.  doi:http://dx.doi.org/10.2113/gscanmin.45.1.87

Paterson, S.R., Pignotta, G.S and Vernon, R.H., 2003, The significance of microgranitoid enclave shapes and orientations. Journal of Structural Geology, v.26, pp. 1465-1481.  doi:http://dx.doi.org/10.1016/j.jsg.2003.08.013

Benn, K., Paterson, S. R., Lund, S. P., Pignotta, G. S. & Kruse, S. 2001. Magmatic fabrics in batholiths as markers of regional strains and plate kinematics: Example of the Cretaceous Mt. Stuart batholith. Phys. Chem. Earth (A) 26(4-5), pp. 343-354.   doi:http://dx.doi.org/10.1016/S1464-1895(01)00064-3

Pignotta, G.S. and Benn, K., 1999, Magnetic fabrics of the Barrington Passage pluton, Meguma Terrane, Nova Scotia: a two-stage fabric history of syntectonic emplacement. Tectonophysics, v.307, pp. 75-92.   doi:http://dx.doi.org/10.1016/S0040-1951(99)00119-5

Benn, K., Ham, N.M., Pignotta, G.S. and Bleeker, W., 1998, Emplacement and deformation of granites during transpression: magnetic fabrics of the Archean Sparrow pluton, Slave Province, Canada. Journal of Structural Geology, v.20, pp. 1247-1259.   doi:http://dx.doi.org/10.1016/S0191-8141(98)00065-0

Benn, K., Horne, R.J., Kontak, D.J., Pignotta, G.S. and Evans, N.G., 1997, Syn-Acadian emplacement model for the South Mountain batholith, Meguma Terrane, Nova Scotia: magnetic fabric and structural analyses. Geological Society of America Bulletin, v.109, pp. 1279-1293.   doi:http://dx.doi.org/10.1130/0016-7606(1997)109<1279:SAEMFT>2.3.CO;2

Ham, N., Benn, K., Pignotta, G.S. and Bleeker, W., 1997, Magnetic fabrics in the Sparrow granite pluton: markers of the late Archean strain field in the southern Yellowknife Domain, Slave Province, Canada. Lithoprobe Report, v.56, p.210.

Abstracts

 

Pignotta, G.S. and Paterson, S.R., 2007. Using magmatic structures to unravel the growth history of magma plumbing systems. GSA Abstracts with Programs, Vol. 39 No. 6.

Paterson, S.R., Pignotta, G.S., Zak, J., Memeti, V. Erdmann, S. and Economos, R., 2007. Formation and transfer of stoped blocks into magma chambers: The high temperature interplay between cracking, focused porous flow, and unidirectional growth of sheeted complexes. GSA Abstracts with Programs, Vol. 39 No. 6.

Farris, D.W., Pignotta, G.S. and Paterson, S.R., 2007. Fractal fragmentation of xenoliths in silicic magmas. GSA Abstracts with Programs, Vol. 39 No. 6.

Springer, A.M., Tutak, F., Callihan, S.M., Wetmore, P.H., Alsleben, H., Pignotta, G.S., and Ducea, M.N., 2007. The upper crustal emplacement of the Balbuena pluton by multiple material transfer processes. GSA Abstracts with Programs, Vol. 39 No. 6.

Wetmore, P.H., Connor, C.B., Kruse, S. and Pignotta, G.S., 2007. Geometry of the Trachyte Mesa intrusion, Henry Mountains, Utah, as determined by an integrated geophysical and structural investigation. GSA Abstracts with Programs, Vol. 39 No. 6.

Anderson, J.L., Foley, B., Ball, E.N., Paterson, S.R., Memeti, V. and Pignotta, G.S., 2007. Upper crustal overturn during magmatic surges – a potential Sierra-wide process. GSA Abstracts with Programs, Vol. 39 No. 6.

Alsleben, H., Wetmore, P.W., Ducea, M.N., Gehrels, G., Fatin, T., Pignotta, G.S. and Paterson, S.R., 2007. Early Cretaceous suturing of the Alisitos volcanic arc to North America and the role of the ancestral Agua Blanca Fault in the western Peninsular Ranges of Baja California, Mexico. GSA Abstracts with Programs, Vol. 39 No. 6.

Thompson, J.M., Ball, E.N., Fischer, G.C., Foley, B.J., Memeti, V., Pignotta, G.S., Paterson, S.R., Anderson, J.L., Matzel, J., and Mundil, R., 2007. Downward ductile displacement of volcanic crust during pluton emplacement in the central Sierra Nevada: Undergraduate team research at USC. GSA Abstracts with Programs, Vol. 39 No. 4.

Foley, B.J., Ball, E.N., Fischer, G.C., Thompson, J.M., Memeti, V., Pignotta, G.S., Paterson, S.R., Anderson, J.L., Matzel, J., and Mundil, R., 2007. Searching for the Mojave-Snow Lake Fault: Undergraduate team research at USC. GSA Abstracts with Programs, Vol. 39 No. 4.

Pignotta, G.S., Paterson, S.R. and Zak, J., 2005, An Evaluation Of Younging Direction And Paleovertical Indicators In Magma Chambers. GSA Abstracts with Programs, Vol. 37, No. 7.

Pignotta, G.S., Paterson, S.R. and Coyne, C.M., 2005, The Jackass Lakes Pluton: Evidence For Complex Spatial And Temporal Magma Chamber Evolution In The Sierra Nevada Batholith. GSA Abstracts with Programs, Vol. 37, No. 4.

Coyne, C.M., Pignotta, G.S., Paterson, S.R., and Anderson, J.L., 2004, Magma Mixing/Mingling In A Heterogeneous Multi-Pulse Magmatic System: Evidence From Jackass Lakes Pluton, Central Sierra Nevada Batholith. GSA Abstracts with Programs, Vol. 36, No. 4.

Pignotta,
G.S. and Paterson, S.R., 2003, Magma chamber construction and evolution: Constraints from the Jackass Lakes pluton, central Sierra Nevada. GSA Abstracts with Programs Vol. 35, No. 6.

Lund, S.P., Paterson, S.R., Pignotta, G.S. and Anderson, J.L., 2003, Paleomagnetism and rock magnetism of the Mt. Stuart Batholith: Reassessment of discordant paleomagnetic results. GAC-MAC-SEG 2003 Abstracts, Volume 28.

Pignotta, G.S. and Paterson, S.R., 2002, Mafic microgranitoid enclaves: Strain markers, fabric elements or blobs of deception? GSA Abstracts with Programs, Vol. 34, No. 5.

Pignotta, G.S., Paterson, S.R., and Okaya, D., 2001, Cracking the stoping paradigm: Field and modeling constraints from the Sierra Nevada batholith. EOS Trans. AGU, Vol. 82, No. 6.

Pignotta, G.S. and Paterson, S.R., 2001, The role of stoping in the evolution of magmatic systems: Field and modeling constraints from plutons in the Sierra Nevada batholith California. GSA Abstracts with Programs, Vol. 33, No. 6.

Pignotta, G.S., Paterson, S.R., and Pettersson, D., 2001, Voluminous stoping in the Mitchell Peak Granodiorite, Sierra Nevada, California. GSA Abstracts with Programs, Vol. 33, No.3.

Yoshinobu, A.S., Pignotta, G.S. and Schmidt, K.L., 2000, Geometry of intrusion and magma migration in the Tortuga Ophiolite, Chilean Tierra del Fuego. GSA Abstracts with Programs, Vol. 32, No. 7.

Albertz, M., Wetmore, P. H., Potter, M. E., Pignotta, G. S., Andreasson, G., Paterson, S. R., 2000, How do magma chamber host rock systems evolve through time? GSA Abstracts with Programs, Vol. 32, No. 6.

Pignotta, G.S., Paterson, S.R., and Sammis, C.G., 1999, Thermally and mechanically driven cracking at magma-host rock contacts: Implications for stoping in plutons. EOS Trans. AGU, Vol. 80, No. 46.

Pignotta, G.S. and Benn, K., 1998, Magnetic fabrics of the syntectonic Barrington Passage pluton Meguma Terrane: a record of Acadian folding. Geological Association of Canada Abstracts with Programs, v.28.

Pignotta, G.S. and Benn, K., 1998, Emplacement and polyphase magmatic (?) deformation of the syn-Acadian Barrington Passage pluton, Meguma Terrane, Nova Scotia. GSA Abstracts with Programs, v.30.

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