Graham Lederer
Materials Flow Analyst National Minerals Information Center U.S. Geological Survey Reston, Virginia [email protected] LinkedIn Profile CV |
As a geologist, I am primarily interested in the physical and chemical evolution of the Earth’s crust. My research on ancient and modern orogens focuses on the many processes that create and modify continental crust including deformation, metamorphism, partial melting, and magmatism. Interpreting the spatial and temporal patterns of these petrogenetic processes requires a combination of field- and laboratory-based techniques including detailed structural mapping, microstructural analysis, trace element geochemistry, and accessory phase geochronology. To date, my projects have ranged from characterizing strain in the Grenville basement complex of the Virginia Blue Ridge, constraining the timescales of partial melting in the Himalayan mid-crust through U-Th-Pb dating of syn-tectonic leucogranites, evaluating rare earth phosphate mineralization mechanisms in Proterozoic gneisses of eastern California, and assessing the timing and tempo of large igneous provinces associated with catastrophic changes in Earth history. Currently in my role at the U.S. Geological Survey, I analyze the flows of materials important to society, from mineral production through end use and recycling.
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PEER REVIEWED PUBLICATIONS
McKinney, T., Cottle, J., Lederer, G., 2015, Evaluating rare earth element (REE) mineralization mechanisms in Proterozoic gneiss, Music Valley, California, Geological Society of America Bulletin. doi: 10.1007/s00410-013-0935-9
Lederer, G., Cottle, J., Jessup, M., Langille, J., and Ahmad, T., 2013, Timescales of partial melting in the Himalayan middle crust: insight from the Leo Pargil dome, northwest India, Contributions to Mineralogy and Petrology. doi: 10.1007/s00410-013-0935-9
Langille, J., Jessup, M., Cottle, J., Lederer, G., and Ahmad, T., 2012, Timing of metamorphism, melting and exhumation of the Leo Pargil dome, northwest India. Journal of Metamorphic Geology, 30: 769–791. doi: 10.1111/j.1525-1314.2012.00998.x
CONFERENCE ABSTRACTS
Lead author:
Lederer, G., Burgess, S.D., Bowring, S.A., and Polozov, A., 2015, Tempo of intrusive magmatism in the Siberian Traps. GSA Abstracts with Programs, v.47.
Lederer, G., Cottle, J., 2014, Time-scales of crustal anatexis in the Himalaya revealed by petrochronology, Eos Transactions American Geophysical Union, v. 95.
Lederer, G., Cottle, J., Larson, K., 2014, Linking the Manaslu granite to its source using monazite petrochronology. GSA Abstracts with Programs, v. 46.
Lederer, G., 2014, Timescales of crustal anatexis during collisional orogenesis: insight from monazite petrochronology of Himalayan leucogranites, Linkages and feedbacks in orogenic systems: GSA Penrose Conference.
Lederer, G., Cottle, J. Larson, K., McAtamney, J, Moulton, K., Kellett, D., 2013, Petrochronologic study of granites in the eastern Nepal Himalaya, Eos Transactions American Geophysical Union, v. 94.
Lederer, G., Cottle, J., Jessup, M., Langille, J., and Ahmad, T., 2011, Monazite in Himalayan leucogranites: investigating melt systematics in the mid-crust, GSA Abstracts with Programs, v. 43, p. 609.
Lederer, G., Cottle, J., Jessup, M., Langille, J., and Ahmad, T., 2010, Temporal constraints on partial melting and deformation in the Himalayan mid-crust, Leo Pargil Dome, NW India, Eos Transactions American Geophysical Union, v. 91.
Lederer, G., Cottle, J., Jessup, M., Langille, J., and Ahmad, T., 2010, Petrochronologic constraints on partial melting in the Leo Pargil Dome, NW India, Geochimica et Cosmochimica Acta, v. 74, p. A572.
Lederer, G., Cottle, J., Jessup, M., Langille J., and Ahmad, T., 2010, Time-scales of crustal melting within the Leo Pargil Dome, NW India, in Leech, M.L., Klemperer, S.L., and Mooney, W.D., eds., Proceedings of the 25th Himalaya-Karakoram-Tibet Workshop: U.S. Geological Survey Open-File Report 2010-1099, 242 p.
Lederer, G., and Bailey, C., 2009, Geology and structural history of the Blue Ridge basement complex in Albemarle County, Virginia, GSA Abstracts with Programs, v. 41, p. 56.
Contributing Author:
Ambrose, T., Larson, K., Guilmette, C., Cottle, J., Lederer, G., Buckingham, H., 2014, Ductile extrusion, underplating, and out-of-sequence thrusting within the Himalayan metamorphic core, Kanchenjunga, Nepal, GSA Abstracts with Programs, v. 46.
McKinney, S., Cottle, J., Lederer, G., Granneman, P., 2014, Evaluating mechanisms for rare earth element mineralization in Proterozoic gneiss, Music Valley, CA, Geochimica et Cosmochimica Acta
McAtamney, J., Cottle, J., Larson, K., Lederer, G., Rai. S.M., 2013, Microstructural insights into strain variation along the Main Central thrust system; eastern Nepal Himalaya, Geological Society of America Abstracts with Programs, v. 45.
Langille, J., Jessup, M., Cottle, J., Lederer, G., and Ahmad, T., 2011, Insights into metamorphism, crustal melting, and exhumation of the Leo Pargil Dome, Western Himalaya, from monazite geochronology, Geological Society of America Abstracts with Programs, v. 43, p. 608.
Langille, J., Jessup, M., Cottle, J., Lederer, G., and Ahmad, T., 2010, Kinematic and timing constraints on the Leo Pargil Shear Zone: Implications for extension during exhumation of the Leo Pargil Dome, NW India, Geological Society of America Abstracts with Programs, v. 42, p. 619.
Jessup, M., Cottle, J., Langille, J., Lederer, G., and Ahmad, T., 2010, Strain partitioning and crustal melting within the Leo Pargil Dome, NW India, Geological Society of America Abstracts with Programs, v. 42, p. 664.
Langille J., Jessup, M, Cottle, J., Lederer, G., and Ahmad, T., 2010, Timing of metamorphism and extension in the western Himalaya: Leo Pargil Dome, NW India, Geochimica et Cosmochimica Acta, v. 74, p. A558.
Langille, J., Jessup, M., Cottle, J., Lederer, G., and Ahmad, T., 2010, Timing of metamorphism and extension in the western Himalaya: Leo Pargil Dome, NW India, in Leech, M.L., Klemperer, S.L., and Mooney, W.D., eds., Proceedings of the 25th Himalaya-Karakoram-Tibet Workshop: U.S. Geological Survey Open-File Report 2010-1099, 242 p.
Jessup, M., Cottle, J., Langille, J., Lederer, G., and Ahmad, T., 2010, Contrasting dome formation along the southern margin of the Tibetan plateau: Leo Pargil Dome and Ama Drime Massif, India/Tibet, in Leech, M.L., Klemperer, S.L., and Mooney, W.D., eds., Proceedings of the 25th Himalaya-Karakoram-Tibet Workshop: U.S. Geological Survey Open-File Report 2010-1099, 242 p.
Laskowski, A., Bailey, C., Nicholls, O., Garber, J., Knieser, B., Lederer, G., and Murray, L., 2009, The Sugar Hollow Basin: a Neoproterozoic half graben complex in the central Virginia Blue Ridge, Geological Society of America Abstracts with Programs, v. 41, p. 55.
Gattuso, A.P., Bailey, C., Lemon, C., Lederer, G., Hartmann, A., and Knuth, F., 2008, Geology of the Crozet 7.5’ quadrangle, Blue Ridge Province, Virginia, Geological Society of America Abstracts with Programs, v. 40, p. 12.
McKinney, T., Cottle, J., Lederer, G., 2015, Evaluating rare earth element (REE) mineralization mechanisms in Proterozoic gneiss, Music Valley, California, Geological Society of America Bulletin. doi: 10.1007/s00410-013-0935-9
Lederer, G., Cottle, J., Jessup, M., Langille, J., and Ahmad, T., 2013, Timescales of partial melting in the Himalayan middle crust: insight from the Leo Pargil dome, northwest India, Contributions to Mineralogy and Petrology. doi: 10.1007/s00410-013-0935-9
Langille, J., Jessup, M., Cottle, J., Lederer, G., and Ahmad, T., 2012, Timing of metamorphism, melting and exhumation of the Leo Pargil dome, northwest India. Journal of Metamorphic Geology, 30: 769–791. doi: 10.1111/j.1525-1314.2012.00998.x
CONFERENCE ABSTRACTS
Lead author:
Lederer, G., Burgess, S.D., Bowring, S.A., and Polozov, A., 2015, Tempo of intrusive magmatism in the Siberian Traps. GSA Abstracts with Programs, v.47.
Lederer, G., Cottle, J., 2014, Time-scales of crustal anatexis in the Himalaya revealed by petrochronology, Eos Transactions American Geophysical Union, v. 95.
Lederer, G., Cottle, J., Larson, K., 2014, Linking the Manaslu granite to its source using monazite petrochronology. GSA Abstracts with Programs, v. 46.
Lederer, G., 2014, Timescales of crustal anatexis during collisional orogenesis: insight from monazite petrochronology of Himalayan leucogranites, Linkages and feedbacks in orogenic systems: GSA Penrose Conference.
Lederer, G., Cottle, J. Larson, K., McAtamney, J, Moulton, K., Kellett, D., 2013, Petrochronologic study of granites in the eastern Nepal Himalaya, Eos Transactions American Geophysical Union, v. 94.
Lederer, G., Cottle, J., Jessup, M., Langille, J., and Ahmad, T., 2011, Monazite in Himalayan leucogranites: investigating melt systematics in the mid-crust, GSA Abstracts with Programs, v. 43, p. 609.
Lederer, G., Cottle, J., Jessup, M., Langille, J., and Ahmad, T., 2010, Temporal constraints on partial melting and deformation in the Himalayan mid-crust, Leo Pargil Dome, NW India, Eos Transactions American Geophysical Union, v. 91.
Lederer, G., Cottle, J., Jessup, M., Langille, J., and Ahmad, T., 2010, Petrochronologic constraints on partial melting in the Leo Pargil Dome, NW India, Geochimica et Cosmochimica Acta, v. 74, p. A572.
Lederer, G., Cottle, J., Jessup, M., Langille J., and Ahmad, T., 2010, Time-scales of crustal melting within the Leo Pargil Dome, NW India, in Leech, M.L., Klemperer, S.L., and Mooney, W.D., eds., Proceedings of the 25th Himalaya-Karakoram-Tibet Workshop: U.S. Geological Survey Open-File Report 2010-1099, 242 p.
Lederer, G., and Bailey, C., 2009, Geology and structural history of the Blue Ridge basement complex in Albemarle County, Virginia, GSA Abstracts with Programs, v. 41, p. 56.
Contributing Author:
Ambrose, T., Larson, K., Guilmette, C., Cottle, J., Lederer, G., Buckingham, H., 2014, Ductile extrusion, underplating, and out-of-sequence thrusting within the Himalayan metamorphic core, Kanchenjunga, Nepal, GSA Abstracts with Programs, v. 46.
McKinney, S., Cottle, J., Lederer, G., Granneman, P., 2014, Evaluating mechanisms for rare earth element mineralization in Proterozoic gneiss, Music Valley, CA, Geochimica et Cosmochimica Acta
McAtamney, J., Cottle, J., Larson, K., Lederer, G., Rai. S.M., 2013, Microstructural insights into strain variation along the Main Central thrust system; eastern Nepal Himalaya, Geological Society of America Abstracts with Programs, v. 45.
Langille, J., Jessup, M., Cottle, J., Lederer, G., and Ahmad, T., 2011, Insights into metamorphism, crustal melting, and exhumation of the Leo Pargil Dome, Western Himalaya, from monazite geochronology, Geological Society of America Abstracts with Programs, v. 43, p. 608.
Langille, J., Jessup, M., Cottle, J., Lederer, G., and Ahmad, T., 2010, Kinematic and timing constraints on the Leo Pargil Shear Zone: Implications for extension during exhumation of the Leo Pargil Dome, NW India, Geological Society of America Abstracts with Programs, v. 42, p. 619.
Jessup, M., Cottle, J., Langille, J., Lederer, G., and Ahmad, T., 2010, Strain partitioning and crustal melting within the Leo Pargil Dome, NW India, Geological Society of America Abstracts with Programs, v. 42, p. 664.
Langille J., Jessup, M, Cottle, J., Lederer, G., and Ahmad, T., 2010, Timing of metamorphism and extension in the western Himalaya: Leo Pargil Dome, NW India, Geochimica et Cosmochimica Acta, v. 74, p. A558.
Langille, J., Jessup, M., Cottle, J., Lederer, G., and Ahmad, T., 2010, Timing of metamorphism and extension in the western Himalaya: Leo Pargil Dome, NW India, in Leech, M.L., Klemperer, S.L., and Mooney, W.D., eds., Proceedings of the 25th Himalaya-Karakoram-Tibet Workshop: U.S. Geological Survey Open-File Report 2010-1099, 242 p.
Jessup, M., Cottle, J., Langille, J., Lederer, G., and Ahmad, T., 2010, Contrasting dome formation along the southern margin of the Tibetan plateau: Leo Pargil Dome and Ama Drime Massif, India/Tibet, in Leech, M.L., Klemperer, S.L., and Mooney, W.D., eds., Proceedings of the 25th Himalaya-Karakoram-Tibet Workshop: U.S. Geological Survey Open-File Report 2010-1099, 242 p.
Laskowski, A., Bailey, C., Nicholls, O., Garber, J., Knieser, B., Lederer, G., and Murray, L., 2009, The Sugar Hollow Basin: a Neoproterozoic half graben complex in the central Virginia Blue Ridge, Geological Society of America Abstracts with Programs, v. 41, p. 55.
Gattuso, A.P., Bailey, C., Lemon, C., Lederer, G., Hartmann, A., and Knuth, F., 2008, Geology of the Crozet 7.5’ quadrangle, Blue Ridge Province, Virginia, Geological Society of America Abstracts with Programs, v. 40, p. 12.