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GEOLOGIC NOTE |
1 Department of Geology, University of Wisconsin–Oshkosh, 800 Algoma Boulevard, Oshkosh, Wisconsin 54901; Lehrmann{at}uwosh.edu
2 Department of Geology, University of Kansas, Lawrence, Kansas 66045; present address: University of Nevada–Reno, Reno, Nevada 89557
3 Department of Geology, University of Kansas, Lawrence, Kansas 66045
4 Department of Geology, University of Kansas, Lawrence, Kansas 66045
5 Louisiana State University, Baton Rouge, Louisiana 70803
6 Geological Survey of Canada, Vancouver, British Columbia, Canada, V6B 5J3
7 Geological Survey of Guangxi, Guilin, Guangxi, People's Republic of China
8 Guizhou Bureau of Geology, Guiyang, Guizhou, People's Republic of China
9 Department of Geology, University of Wisconsin–Oshkosh, Oshkosh, Wisconsin 54901; present address: Chevron North America Exploration and Production, McKittrick, California 93251
10 Department of Geology, University of Wisconsin–Oshkosh, Oshkosh, Wisconsin 54901; present address: Anadarko Petroleum Corporation, Houston, Texas 77251
11 Department of Geology, University of Wisconsin–Oshkosh, Oshkosh, Wisconsin 54901; present address: ExxonMobil Upstream Research Company, Houston, Texas 77252
12 Department of Geology, University of Wisconsin–Oshkosh, Oshkosh, Wisconsin 54901; present address: Shell Exploration and Production Company, Houston, Texas 77079
13 Department of Geology, University of Wisconsin–Oshkosh, Oshkosh, Wisconsin 54901; present address: Hess Corporation, Houston, Texas 77002
14 Department of Geology, University of Wisconsin–Oshkosh, Oshkosh, Wisconsin 54901; present address: Anadarko Petroleum Corporation, Houston, Texas 77251
15 Department of Geology, Univer sity of Wisconsin–Oshkosh, Oshkosh, Wisconsin 54901; present address: Newmont Mining Company, Elko, Nevada 89803
Daniel Lehrmann received his bachelor's degree from the University of Wisconsin–Oshkosh, his M.S. degree from the University of Wisconsin–Madison, and his Ph.D. from the University of Kansas. He worked as a research geologist for Exxon Production Research from 1993 to 1996. Since 1996, he has been a faculty member at the University of Wisconsin–Oshkosh.
Pei Donghong received his bachelor's degree from the Xinjiang Petroleum Institute and his M.S. degree from the Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation. He conducted research for this project during his graduate studies at the University of Kansas. He is currently a graduate student in geophysics at the University of Nevada–Reno.
Paul Enos is Emeritus Distinguished Professor at the University of Kansas, where he taught from 1982 to 2003 and where he received a B.S. degree in geology in 1956. He earned an M.S. degree at Stanford University and his Ph.D. from Yale University. From 1964 to 1970, he was a research geologist at Shell Development Company and was a faculty member at the State University of New York Binghamton from 1970 to 1982.
Marcello Minzoni received his B.S. and M.S. degrees from the University of Ferrara in Italy. He is currently completing his Ph.D. at the University of Kansas. Starting January 2007, he will be working for Shell International Exploration and Production Company. His interests are focused on the influence of tectonics on carbonate-platform evolution and termination.
Brooks B. Ellwood received his bachelor's degree from Florida State University and his M.S. degree and his Ph.D. from the University of Rhode Island Graduate School of Oceanography. He did postdoctoral research at Ohio State University and was a faculty member at the University of Georgia and the University of Texas at Arlington, where he was acting chair. In 1999, he took the chair's position at Louisiana State University and is currently a faculty member there.
Michael J. Orchard received his B.Sc. degree and his Ph.D. from the University of Hull in England and subsequently undertook postdoctoral research at Cambridge before joining the Geological Survey of Canada in 1979.
Zhang Jiyan is a senior geologist, recently retired from the Guangxi Geological Survey. He received his bachelor's degree from the Chengdu College of Geology. His interests are sedimentary geology and regional geology.
Wei Jiayong is a senior geologist, recently retired from the Guizhou Bureau of Geology, where he had served since 1957. He received his bachelor's degree from China College of Geology, Beijing. His interests are sedimentary geology, paleontology, and regional geology.
Pete Dillett received his bachelor's degree from the University of Wisconsin–Oshkosh and his M.S. degree from the University of Kansas. He joined Chevron North America Exploration and Production in 2004, where he works as an earth scientist in California. His interests are carbonate sequence stratigraphy and reservoir-monitoring technologies.
Jon Koenig received his bachelor's degree from the University of Wisconsin–Oshkosh and his M.S. degree from Baylor University. He joined Anadarko Petroleum Company in 2005, where he works as a development geologist. His interests are carbonate sedimentology and facies models.
Kelley Steffen received her bachelor's degree from the University of Wisconsin–Oshkosh and her M.S. degree from the University of Miami, Rosenstiel School of Marine and Atmospheric Sciences. She has been a research geologist for ExxonMobil Upstream Research since 2005. Her interests are carbonate sedimentology and modern processes.
Dominic Druke received his bachelor's degree from the University of Wisconsin–Oshkosh and his M.S. degree from New Mexico State University. He joined Shell Exploration and Production Company in 2005, where he works as an exploration geologist for onshore United States. His interests are sedimentary geology, stratigraphy, and structural geology.
Jordayna Druke received her bachelor's degree from the University of Wisconsin–Oshkosh and her M.S. degree is in progress from New Mexico State University. She recently joined Hess Oil Corporation. Her interests are sedimentary geology, sequence stratigraphy, and salt tectonics.
Benjamin Kessel received his bachelor's degree from the University of Wisconsin–Oshkosh and his M.S. degree from Utah State University. He joined Anadarko Petroleum Corporation in 2005 and is currently working as a development geologist in the Rockies Conventional Group. His interests are stratigraphy, sedimentary geology, and regional and global tectonics.
Trent Newkirk received his bachelor's degree from the University of Wisconsin–Oshkosh and is currently working on his M.S. degree from Northern Arizona University and works at the Newmont Mining Company as a geologist on the Carlin Trend, developing underground economic potential. His interests are volcanology, volcaniclastic sedimentation, sedimentary geology, and emplacement processes.
The Nanpanjiang Basin of south China contains four exceptionally well-exposed, isolated Triassic carbonate platforms. Detailed mapping of two-dimensional transects and description of stratigraphic sections allow the reconstruction of facies architecture, sequence stratigraphy, and evolution of the platforms. Biostratigraphy, magnetic-susceptibility profiles, and volcanic-ash horizons allow chronostratigraphic correlation and, thus, a basinwide evaluation of mechanisms controlling platform evolution.
A comparison of platform architecture demonstrates that southerly platforms have substantially greater thickness, backstepping geometry, pinnacle development, and earlier drowning that resulted from greater tectonic subsidence proximal to a probable convergent margin along the southern perimeter of the basin. Felsic volcanics thicken southward and contributed to the termination of the southernmost platform, indicating the development of a volcanic arc along the southern margin of the South China tectonic block. The northernmost isolated platform had greater longevity and lesser accumulation and lacks backstepping and pinnacle phases of development. Basin-margin intertonguing relationships, or lack thereof, demonstrate that earlier siliciclastic influx into the basin to the south and concurrent starved-basin conditions to the north impacted the evolution of platform-margin geometries.
Comparative analysis of platform evolution shows that the timing and rates of tectonic subsidence controlled the timing of platform termination by drowning, backstep geometries, pinnacle development, and overall platform thickness. The timing of siliciclastic basin fill dictated differences in platform-margin geometries such as slope angle, relief above basin floor, and the presence or absence of basinward platform progradation. Despite the dramatic differences in platform architecture, eustatic sea level fluctuations imparted a basinwide sequence-stratigraphic signal.
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