Geological Society of America Bulletin
نویسنده
چکیده
Seismic reflection profiles, drill-hole data, and geologic maps delimit the form of normal faults and Tertiary sedimentary rocks in the southern half of the Cache Valley basin in northern Utah. Dips of faults and sedimentary rocks were estimated from time-migrated reflection profiles by using the stacking velocities for the data. At the southern end of the basin, the East Cache fault zone is listric; it shows 50°W dips near the surface and ≈20°W dips at depth. The fault zone has been the site of ≈5.6 km of net dip slip. Tertiary rocks dip 18°E–25°E and exhibit a rollover geometry above the fault zone. No faults are interpreted on the western side of the basin. In the central part of the basin in Utah, the East Cache fault is a single fault that dips at least 45°W near the surface and is the site of 4.5–6.4 km of net dip slip. Here, the basin is bounded to the west by the West Cache fault, which is the site of at least 1 km of net slip that increases northward to 2 km of net slip. Slip on the East Cache fault resulted in planar, east-dipping, older Tertiary rocks near the bottom of the basin. Younger Tertiary strata, with southwest, west, and northwest dips, reflect complex tilting due to slip on the West and East Cache faults. Anticlines in the Tertiary basin-fill deposits are present in the central part of the basin and may reflect changes in normal-fault geometry at depth. Northward, dip slip on the East Cache fault zone decreases to 2.5 km. The basin is broad, shallow, and filled with nearly flat lying Tertiary rocks. This area, near the north-south midpoint of the basin, is bounded by the West and East Cache faults, but slip on the West Cache fault appears to diminish northward. A north-trending reflection profile tied to both drill-hole data and the east-trending seismic profiles indicates that the basin is deeper in the southern end. The along-strike changes in fault geometry, the amount of fault-slip, the subsurface form of the basin-filling sedimentary rocks, and the form of the basin indicate a complex history of faulting and deposition during its formation. This study and other recent ones from the Basin and Range province indicate that such complexities may be typical of many Tertiary basins in the region.
منابع مشابه
Cordilleran Section of the Geological Society of America.
cordilleran section of the geological society of america. Book lovers, when you need a new book to read, find the book here. Never worry not to find what you need. Is the cordilleran section of the geological society of america your needed book now? That's true; you are really a good reader. This is a perfect book that comes from great author to share with you. The book offers the best experien...
متن کاملPaleotemperature Estimation Using Leaf-Margin Analysis: Is Australia Different?
s with Program, v. 22,7, p. A350. GREENWOOD, D.R., and CHRISTOPHEL, D.C., 2004, The origins and Tertiary history of Australian ‘‘Tropical’’ rainforests: in Bermingham, E., Dick, C., and Moritz, C., eds., Tropical Rainforests: Past, Present, and Future: Chicago University Press, Chicago. GREENWOOD, D.R., MOSS, P.T., ROWETT, A.I., VADALA, A.J., and KEEFE, R.L., 2003, Plant communities and climate...
متن کاملApplication of Electron Probe Microanalysis to the Study of Geological and Planetary Materials.
The impact of electron probe microanalysis on the study of geological and planetary materials has been tremendous. Electron microprobes evolved into routine analytical instruments in geological research laboratories as instrument capabilities improved and applications to geologic/planetary materials expanded. The contributions of electron probe microanalysis to the characterization of minerals,...
متن کاملGeological Society of America Bulletin
The relationship between temperature and O content relative to that for a Cretaceous belemnite of the Pee Dee formation previously reported (Epstein, Buchsbaum, Lowenstam, and Urey, 1951) has been redetermined using modified procedures for removing organic matter from shells, and is found to be t (°O = 16.5 4.38 + 0.145*, where 8 is the difference in per mil of the O to O ratio between the samp...
متن کاملAn Affiliate of the AMERICAN ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE
s of the Joint Meeting of the . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 New Jersey Academy of Science and the Mid-Atlantic Chapter, Ecological Society of America Officers of The Academy President Paul A. X. Bologna, Ph.D. Past President Laura Lorentzen, Ph.D. Secretary Eric Iannacone, Ph.D. Treasurer Sonia Arora, Ph.D. Editor, The Bulletin Michael J. Kennis...
متن کامل