PBS-SEPM Luncheon - Dustin Sweet

The Ancestral Rocky Mountains: New Perspectives on an Enigmatic Orogenic Event

Dr. Dustin Sweet
Department of Geosciences
Texas Tech University

The ancestral Rocky Mountains (ARM) were an intraplate collage of Precambrian-cored uplifts and intervening late Paleozoic sedimentary basins that encompassed an area from modern Oklahoma to Utah. Although many of the details are debated, the most commonly attributed tectonic model for ARM development is intraplate stress from sequential intercontinental suturing along Ouachita-Marathon belt. After uplift ceased, the nearly unanimous portrayal for ARM uplifts is erosional beveling into early Triassic. However, recent developments suggest that at least within the core ARM region (e.g. Anadarko and Paradox basins) experienced an episode of broad regional subsidence as indicated by: 1) burial of up to 1000 m of topographic relief on the Precambrian-cored highlands and 2) significant (300-1000 m) post-tectonic accommodation recorded in sedimentary basins. Isostatic adjustment, after ARM horizontal stresses ceased, of a high-density crustal root that is spatially coincident with the core ARM region has recently been proposed to account for the phenomena. This phase of load-induced subsidence likely occurred around the Pennsylvanian-Permian boundary and implies that ARM basin models must account for two modes of subsidence. This presentation will focus on the field relationships that led to the load-induced model and more recent work being done (largely by graduate students) to test the model.

Speaker Dr. Dustin Sweet
Dustin E. SweetCurriculum VitaeDepartment of Geosciences, Science Building, Room 318, Texas Tech University, Lubbock, TX 79409-1053 Contact information: Name: Dustin Edman Sweet E-mail: dustin.sweet@ttu.eduHome Phone: (405) 659-5007 Office Phone: (806) 742-0225 Education2003-09 University of Oklahoma, School of Geology and Geophysics, PhD.-4.0 GPA Dissertation title: Glaciation in Equatorial Pangaea: Testing the ...

Dustin E. Sweet
Curriculum Vitae
Department of Geosciences, Science Building, Room 318, Texas Tech University, Lubbock, TX 79409-1053


Contact information:


Name: Dustin Edman Sweet E-mail: dustin.sweet@ttu.edu
Home Phone: (405) 659-5007 Office Phone: (806) 742-0225


Education
2003-09 University of Oklahoma, School of Geology and Geophysics, PhD.-4.0 GPA Dissertation title: Glaciation in Equatorial Pangaea: Testing the hypothesis in the Pennsylvanian-Permian Fountain Formation (Colorado) [advisor: Dr. Gerilyn S. Soreghan]
2000-03 Boise State University, Department of Geology, M.S.-4.0 GPA Thesis title: Tectonostratigraphy of the Central Pequop Mountains, Elko County, Nevada. [advisor: Dr. Walter S. Snyder]
1996-2000 Boise State University, Department of Geology, B.S.-3.28 GPA Thesis title: Jurassic Sedimentary Sequence in the Izee Terrane of West-Central, Idaho [advisor: Dr. C.J. Northrup]


Teaching experience
Texas Tech University
Instructor:
GEOL 4325, Sedimentology & Stratigraphy (2011, 2012)
GEOL 5426, Sequence Stratigraphy (2012, 2013)
GEOL 5422, Sedimentary Geology of Carbonates (2012)
GEOL 5001, Field Geology of Carbonates (2012)
University of Oklahoma
Instructor:
GEOL 3003, Stratigraphy and Structure for Petroleum Engineers (2006-08)
Teaching Assistant:
GEOL 3123, Introduction to Field Geology, (2006)
GEOL 4113, Depositional Systems and Stratigraphy, (2004, 2005)
GEOL 1124, Earth History, (2004)
GEOL 1114, Physical Geology, (2003, 2007)
Boise State University
Instructor:
GEOL 323, Petrology, sedimentary portion, (2003)
GEOL 324, Petrography, sedimentary portion, (2003)
GEOL 310, Sedimentation and Stratigraphy (lecture & lab), (2002)
Teaching Assistant:
GEOL 482, Field Camp, Sardinia, Italy (2002, 2003)
GEOL 324, Petrography, sedimentary portion, (2002)
GEOL 102, Historical Geology, (2001, 2002)
GEOL 100, Fundamentals of Geology, (2001)
GEOL 310, Sedimentation and Stratigraphy, (2000, 2001)

Work Experience
• Texas Tech University, Assistant Professor (2011-present)
• Chevron Energy Technology Company, Stratigrapher (2009-2011)
• Chevron Energy Technology Company Internship (2007, 2008)
• Field research, central Colorado (2007-2008)
• Field research and well logging, western and central Colorado (2004-06)
• Field research in the Ural Mountains, Russia (2001)
• Master’s thesis field research in the Central Pequop Mtns., Nevada (2000-01)
• Mapping team leader, EDMAP program, Monroe Butte 7.5’ quad., Idaho (1999)
Chevron Energy Technology Projects
• Prospect mapping and maturation in west Africa [January-March, 2011]
• Regional upper Cretaceous paleogeographic maps of west Africa (southern Gabon, Republic of Congo, Angola) [April-December, 2010]
• Assessed the prospectivity of a post salt Cretaceous deepwater sandstone play in the Republic of Congo through the integration of seismic, well and analog data [January-March, 2010]
• Lower Congo Basin Presalt Play Risk GENV Workshop, Presented paleogeographic maps and finalized the workshop workflow and results report [September-October, 2009]
• Created Neocomian-Aptian (presalt) paleogeography of the western Atlantic margin (Lower Congo Basin) through the integration of 2-D seismic, 3-D seismic, well data, analogue and models [April-December, 2009]
• Utilized 2-D seismic, climate models and geologic literature to assess paleogeography, paleoclimate, regional stratigraphy, basin formation, structure, and petroleum systems in Baffin Bay (Greenland)—intern project [April-June, 2008]
• Utilized 2-D seismic and well data to determine sand delivery pathways as reservoir risk assessment for 2007 Caribe Bid round in Rioacha Field and surrounding region (Columbia)—intern project [May-August, 2007]
Awards, Honors and Service
• Ben Hare Most Outstanding Graduate Research, 2009
• Outstanding Paper of the Year, The Mountain Geologist, 2008
• University of Oklahoma Graduate College Outstanding Teaching Award, 2007
• DeGolyer Presidential Fellow, University of Oklahoma, 2007
• Geochemistry Faculty search committee, graduate representative, 2007
• Student Advisory Committee, School of Geology & Geophysics, 2006
• Stan Cunningham Excellence in teaching award, 2003-2004
• Teaching assistant of the year, Boise State Geology Club Award, 2001-2002
• Will Burnham Scholarship: academic year 1999-2000, 2001-2002
• Dean’s List with Honors: spring 1997, Fall 1998, Fall 1999, Spring 2000

Research Funding (Requests & Awards)
• Survivability of glacially induced quartz grain microtextures during glacio-fluvial transport, NSF-EAR-Sedimentary Geo & Paleobiology & EAR-Geomorphology, $140,859, January 2013, Pending
• Testing a Two-phase subsidence model for the ancestral Rocky Mountains in the Taos Trough region of Northern New Mexico, NSF-EAR-Sedimentary Geo & Paleobiology, $115, 036, July 2012, Declined
• Survivability of glacially induced quartz grain microtextures during glacio-fluvial transport, NSF-EAR-Sedimentary Geo & Paleobiology & EAR-Geomorphology, $144,437, January 2012, Declined
• SEPM Presidential Fund—student grant ($1000), 2008
• J.D. Love Field Geology Fellowship ($1000), Wyoming Geological Society, 2007
• Colorado Scientific Society Research Grant ($500), 2007
• Sigma Xi Grants-in-Aid of Research ($500), 2006
• Geological Society of America, Graduate Student Research Grants ($2000), 2005
• Nevada Petroleum Society, Student Research Grant ($1000), 2001
Short Courses & Workshops
• Hedberg Research Conference-Late Paleozoic Tectonics and Hydrocarbon Systems of western Pangaea [2003]
• Late Paleozoic Icehouse Workshop, National Science Foundation sponsored [2004]
• Sequence stratigraphy, Instructors: Kirt Campion (ExxonMobil) & Art Donovan (BP) [2005]
• Continental trace fossils, SEPM short course, Instructor: Stephen Hasiotis [2005]
• Predictive stratigraphy, St. Anthony Falls Laboratory, Instructor: Marty Perlmutter & Chris Paola [2007]
• Rift Fill workshop, Chevron Energy Technology Center, Instructor: Christopher Scholz [2008]
• Basin Analysis: Chevron Energy Technology, Instructor: Barry Katz [2008]
• RiskOG Risk and Uncertainty School, Chevron Exploration Review Team and Rose & Associates, Instructors: Truett Enloe (Chevron) & Bob Otis (Rose & Associates) [2009]
• Applied Subsurface Geologic Mapping, Subsurface Consultants & Associates, Instructor: Siamak Agah [2009]
• Earth Science Pathways Training, Chevron Energy Technology Company [2009]
• Seismic Fundamentals, Texseis, Inc., Instructor: Mike Graul [2009]
• Interpretation of 3D Seismic Data, Nautilus, Instructor: Alistair Brown [2010]
• Applied Petroleum Geochemistry, Chevron Energy Technology Company, Instructors: Joe Curiale, Richard Parrish and Fang Lin [2010]
• Formation Evaluation, Chevron Energy Technology Company, Instructor: Barry Reik [2010]
• Tying Seismic Data to Wells, Chevron Energy Technology Company, Instructor: Jennifer Zhang and Patrick Ditty [2010]


Publications
Peer Reviewed Papers
Soreghan, G.S. and Sweet, D.E., in revision, Evidence for Glaciation in the late Paleozoic Ancestral Rocky Mountains, and Implications for Upland Glaciation in Tropical Pangaea. Journal of Geology.
Soreghan, G.S., Marra, K.R., Kaplan, S.A., Balco, G., Sweet, D.E., Soreghan, M.J. and Blum, M., in review, Late Cenozoic drainage evolution of the northeastern Colorado Plateau inferred from stratigraphy and geochronology of the Quaternary sediments in and around Unaweep Canyon. Geosphere.
Balco, G., Soreghan, G.S., Sweet, D.E. and Marra, K.R., in revision, Cosmogenic-nuclide burial ages for Pleistocene sedimentary fill in Unaweep Canyon, Colorado, USA. Quaternary Geology.
Sweet, A.C., Soreghan, G.S., Sweet, D.E., Soreghan, M.J., and Madden, A.S., 2013, A re-intepretation of the source and origin for the middle Permian (Flowerpot-Blaine) redbeds in Oklahoma: Palaeogeographic and Palaeoclimatic implications. Sedimentary Geology, v. 284-285, p. 181-196.
Sweet, D.E. and Soreghan, G.S., 2012, Estimating magnitudes of relative sea-level change in a coarse-grained fan delta system: Implications for Pennsylvanian glacioeustasy. Geology, V. 40, p. 979-982.
Soreghan, G.S., Keller, G.R., Gilbert, M.C., Chase, C.G., and Sweet, D.E., 2012, Load-induced subsidence of the ancestral Rocky Mountains recorded by preservation of Permian landscapes. Geosphere, V. 8, no. 3, p. 654-668.
Sweet, D.E. and Soreghan, G.S., 2010, Application of quartz sand microtextural analysis to infer cold-climate weathering for the equatorial Fountain Formation (Pennsylvanian-Permian, Colorado). Journal of Sedimentary Research, v. 80, p. 666-677.
Sweet, D.E. and Soreghan, G.S., 2010, Late Paleozoic tectonics and paleogeography of the Ancestral Front Range: Structural, stratigraphic and sedimentological evidence from the Fountain Formation (Manitou Springs, Colorado). Geological Society of America Bulletin, v. 122, p. 575-594.
Soreghan, G.S., Soreghan, M.J., Poulsen, C.J., Young, R.A, Sweet, D.E. and Davogustto, O.C., 2009, Anomalous cold in Pangaean tropics: Reply to Discussion. Geology, p. e193-e194.
Soreghan, G.S., Soreghan, M.J., Sweet, D.E., and Moore, K.D., 2009, Alluvial fan or proglacial outwash? An alternative interpretation for the proximal Cutler Formation (upper Paleozoic, Paradox Basin). Journal of Sedimentary Research, v. 79, p. 495-522.
Soreghan, G.S., Sweet, D.E., Marra, K.R., Eble, C.F., Soreghan, M.J., Elmore, R.D., Kaplan, S.A., and Blum, M.D., 2009, An exhumed Late Paleozoic canyon in the Rocky Mountains: Reply to Discussion. Journal of Geology, v. 117, p. 215-220.
Sweet, D.E. and Soreghan, G.S., 2008, Polygonal Cracking in Coarse Clastics Records Cold Temperatures in the Equatorial Fountain Formation (Pennsylvanian-Permian, Colorado). Palaeogeography, Palaeoclimatology, Palaeoecology, v. 268, no. 3-4, p. 193-204.
Soreghan, G.S., Soreghan, M.J., Poulsen, C.J., Young, R.A, Sweet, D.E. and Davogustto, O.C., 2008, Anomalous cold in Pangaean tropics. Geology, v. 36, No. 8, p. 659-662.
Moore, K.D., Soreghan, G.S. and Sweet, D.E., 2008, Stratigraphic and structural relations in the proximal Cutler Formation of the Paradox Basin: Implications for the timing of movement on the Uncompahgre fault. The Mountain Geologist, v. 45, no. 2, p. 49-68.
Soreghan, G.S., Sweet, D.E., Marra, K.R., Eble, C.F., Soreghan, M.J., Elmore, R.D., Kaplan, S.A., and Blum, M.D., 2007, An exhumed Late Paleozoic canyon in the Rocky Mountains. Journal of Geology, v. 115, p. 473-481.


Extended Abstracts
Soreghan, G.S., Soreghan, M.J. and Sweet, D.E., 2009, Hypothesized glaciation in tropical Pangaea: The challenge of assessing upland glaciation. 27th International Association of Sedimentary Geology, Abstracts and Programs.
Schiappa, Tamra A., Snyder, W.S., Trexler, J.H., Davydov, V.I., and Sweet, D., 2003, Depositional Architecture of Basins of the Upper Paleozoic Antler Foreland, Northern Pangaea: Examples from Nevada, USA. XVth International Congress on Carboniferous and Permian Stratigraphy, Abstracts and Programs, p. 468-469.
Snyder, Walter S., Schiappa, Tamra A., Trexler, James H., Cashman, P., Davydov, V.I., Sweet, D., 2003, Permo-Carboniferous tectonostratigraphic framework for Western North America: Implications for global correlation. XVth International Congress on Carboniferous and Permian Stratigraphy, Utrecht Netherlands, Abstracts and Programs, p. 510-512.
Sweet, D. and Snyder, W.S., 2002, Middle Pennsylvanian through Early Permian Tectonically Controlled Basins: Evidence from the Central Pequop Mountains, Northeast Nevada. AAPG Hedberg Research Conference-Late Paleozoic Tectonics and Hydrocarbon Systems of Western North America—The Greater Ancestral Rocky Mountains, p. 74-77.
Snyder, W. S., Trexler, J. H., Jr., Davydov, V., I., Cashman, P., Schiappa, T. A., and Sweet, D., 2002, Upper Paleozoic Tectonostratigraphic Framework for the Western Margin of North America. AAPG Hedberg Research Conference-Late Paleozoic Tectonics and Hydrocarbon Systems of Western North America-The Greater Ancestral Rocky Mountains, p. 58-61.
Abstracts (*indicates student authors)
Carsrud, C.*, Watters, A. J.*, Sweet, D. (2013). A Pennsylvanian Age for the Fountain Formation constrained by litholologic comparison of overlying eolian units. GSA Abstracts with Programs, v. 45.
Baird, H.*, Sweet, D., Horita, J. (2013). Carbonate Stable Isotopes from Soil Cores from Playa Lakes, Southern High Plains, Texas. GSA Abstracts with Programs, v. 45.
Mathis, B. A.*, Sweet, D. (2013). Deciphering early Pennsylvanian paleogeography of the ancestral Rocky Mountains in the Taos trough region through soft-sedimentary fold analysis, Sangre de Cristo Mountains, New Mexico. GSA Abstracts with Programs, v. 45.
Sweet, D. (2013). Load-induced subsidence model of the core Ancestral Rocky Mountains: The hypothesis and preliminary tests. GSA Abstracts with Programs, v. 45.
Dunne, G.*, Sweet, D., Barnes, M., Baird, H.*, Hudnall, W. (2013). Whole-rock geochemical climate signatures of paleosols recovered from playa cores, Southern High Plains, Texas. GSA Abstracts with Programs, v. 45.
Watters, A.J.* and Sweet, D.E., 2012, Early Permian Wind Parameters recorded in the Lyons Formation, Manitou Springs, Colorado. GSA Abstracts with Programs, v. 44, no. 6.
Findlay, C.P. III* and Sweet, D.E., 2012, Modeling competency through volume expansion of fine-grained debris flows housed within the Fountain Formation, Colorado. GSA Abstracts with Programs, v. 44, no. 6.
Soreghan, G.S. and Sweet, D.E., 2010, Evidence for Upland Glaciation in Western Tropical Pangaea
Sweet, D.E. and Soreghan, G.S., 2009, Magnitude of early Pennsylvanian (Morrow-Atokan) eustatic change: Constraints from a fan-delta setting. AAPG Annual Meeting—Programs with Abstracts.
Soreghan, G.S., Soreghan, M.J., Hamilton, M.A. and Sweet, D.E., 2008, Ice, dust and cold in the Late Paleozoic tropics. AAPG Annual Meeting—Programs with Abstracts.
Sweet, D.E. and Soreghan, G.S., 2007, SEM textures of quartz from the upper Paleozoic Fountain Formation (Manitou Springs, Colorado) suggest a possible glacial influence on sedimentation. GSA Abstracts with Programs, v. 39, no. 6.
Soreghan, G.S. (Lynn), Sweet, Dustin E., Marra, Kristen R., Eble, Cortland F., Soreghan, Michael J., Elmore, R. Douglas, Kaplan, Sara A., and Blum, Michael D., 2006, A Paleozoic Landscape in the Rocky Mountains. GSA Abstracts with Programs, v. 38, no. 6.
Sweet, D.E. and Soreghan, G.S., 2005, Periglacial Features in the Paleoequatorial Fountain Formation (Permo-Pennsylvanian, Colorado)?. Eos Transactions, AGU, 86(52), Fall Meeting Supplement, PP11B-1466.
Soreghan, G.S., Soreghan, M.J., Eble, C.F., Sweet, D., Davogustto, O., Young, R.A. and Elmore, R.D., 2005, Late Paleozoic Deglaciation in Western Equatorial Pangaea. Eos Transactions, AGU, 86(52), Fall Meeting Supplement, T11D-0466.
Sweet, D., and Soreghan, G.S., 2005, Periglacial Features in the Fountain Formation (Permo-Pennsylvanian, Colorado)?. GSA Abstracts with Programs, v. 37, no. 5.
Kaplan, S.A., Soreghan, G.S., Sweet, D., and Blum, M.D., 2005, The History of the Ancestral Gunnison River Through Western Unaweep Canyon and Gateway (Colorado). GSA Abstracts with Programs, v. 37, no. 5.
Soreghan, G.S., Marra, K.R., Sweet, D., Eble, C.F., and Soreghan, M.J., 2005, Preliminary Results of Deep Drilling in Western Unaweep Canyon (Colorado): A Paleozoic to Cenozoic History Revealed. GSA Abstracts with Programs, v. 37, no. 5.
Sweet, D. et al., 2004, Style and Spatial Distribution of the C5 Unconformity (Desmoinesian) in Eastern Nevada: Implications for the Destruction of the Ely Basin and Initiation of the Hogan Basin. GSA Abstracts with Programs, v. 36, no. 5.
Sweet, D., Snyder, Walter S., Trexler, J.H. Jr., 2002, Middle Pennsylvanian through Early Permian Regional Tectonic Unconformities in Northeastern and Eastern Nevada. GSA Abstracts with Programs, v. 34, no. 6.
Elias, E., Sweet, D., and Northrup, C.J., 2002, Structural Analysis of the Variscan Nappe Zone, Porto Corallo, Sardinia, Italy: GSA Abstracts with Programs, v. 34, no. 6.
Sweet, D., Snyder, W.S., Davydov, V.I., Trexler, J.H.Jr., and Groves, J.R., 2001, Upper Paleozoic Tectonic Unconformities in the Central Pequop Mountains, Nevada. GSA Abstracts with Programs, v. 33, no. 5, P47.
Sweet, D., 2000, A Jurassic Sedimentary Sequence in the Izee Terrane of West-Central, Idaho. GSA Abstracts with Programs, v. 32, no. 5, p. A40.


 

Full Description
Organizer PBS-SEPM

When?

Tue, April 16, 2013
11:30 a.m. - 1 p.m.
(GMT-0500) US/Central

Event has ended

Where?

Midland Center
Midland, TX 79701