Igneous petrology and Tectonics
Office: EOS-Main 305 Phone: 778-240-1278
1) Geochemistry and tectonics of convergent margins: impact of slab windows/ridge subduction on magmagenic environment; temporal-compositional linkages related to progression from nascent to mature-stage magmatism; timescales of arc activity, maturation, and termination.
2) Planetary evolution: What's Earth been doing: long-term continuous crustal growth, or early segregation followed by crustal recycling at subduction zones?
3) Relationship between copper-gold mineralization and subduction: Are these metals coming out of the subducted sediment component, or out of the mantle?
Tools: Radiogenic isotopes, plutonic rock suite classification, plate kinematics and plate-margin reconstructions.
CURRENT PROJECT: Temporal and geochemical evolution of a subduction cycle: a case study of the Mesozoic Nicola Arc, southern Quesnel Terrane, Canadian Cordillera.
This project is in completion stages. Please, feel free to 'harass' me with offers of real, tangible employment, with a salary, even? Is that how the employment scene still works? I can hardly remember, I've been stuck in s-k-u-l-e for way too long. Anyways, grad-student-lifestyle bitterness aside, I can say I still love the work itself, and I do have some very cool results coming out imminently as even cooler papers -- Guaranteed to help you fall asleep on those insomniatic nights, if the chamomile tea (snerp!) and/or smooth tunes aren't doing the trick for ya.
1. Mesozoic U-Pb geochronology and magmatic trends of the southern Quesnel and Stikine terranes, Canadian Cordillera: episodic versus continuous emplacement style for the Nicola Arc. [submitted: Canadian Journal of Earth Sciences]
2. A lead-isotopic method for vectoring of Copper-Gold mineralization in the Mesozoic Nicola Arc assemblage, southern Quesnel Terrane, Canadian Cordillera. [in prep: Economic Geology]
3. Identifying slab contributions in arc magmas during early stages of a subduction cycle, Mesozoic Nicola Arc assemblage, southern Quesnel Terrane, Canadian Cordillera. [in prep: Journal of Petrology]
4. Tracing Precambrian sediments into the Nicola Arc subduction zone: Isotopic verifiation for a North American (continental) affinity for the "accreted" Quesnel Terrane, Canadian Cordillera. [in prep: Geological Society of America Bulletin]
Breitsprecher, K., and Thorkelson, D.J., 2009. Neogene kinematic evolution of the Nazca–Antarctic–Phoenix slab windows beneath Patagonia and the Antarctic Peninsula. Tectonophysics 464: 10-20.
Thorkelson, D.J., and Breitsprecher, K. 2005. Partial melting of slab window margins: genesis of adakitic and non-adakitic magmas. Lithos 79: 25-41.
Breitsprecher, K., Thorkelson, D.J., Groome, W.G., and Dostal., J., 2003. Geochemical confirmation of the Kula-Farallon slab window beneath the Pacific Northwest in Eocene time. Geology 31: 351-354.
Dostal, J., Breitsprecher, K., Church, B.N., Thorkelson, D.J., and Hamilton, T.S., 2003. Eocene melting of Precambrian lithospheric mantle: analcime-bearing volcanic rocks from the Challis-Kamloops Belt of south central British Columbia. Journal of Volcanology and Geothermal Research 126: 303-326.
TEACHING: Sessional Instructor, 2003-2009 (UBC, SFU, Douglas College)
Lower div: Intro Geology, Intro Mineralogy, Intro Petrology.
Upper div: Igneous Petrology, Tectonic History of North America, Marine Geology (co-instructed).
Guest lecturer (upper): Geochemistry (arc-geochemistry), Economic Geology (tectonic context of porphyry deposits).
Commendations: Mineral Exploration Roundup, AME Student Research Poster award (2008, 2010)
Scholarships: NSERC PGS-D3 (Doctoral scholarship, 2005-2007); Geoscience BC Scholarship (2007, 2008)
Project Grants: Geological Survey of Canada (TGI-3 Initiative): 2005, 2007-2009. $40,000 GeoscienceBC (2006) $24,500