New approach to time correlation in Proterozoic rocks: sequence boundaries in the Brigham Group, Utah
Conference
·
· Geol. Soc. Am., Abstr. Programs; (United States)
OSTI ID:6614662
The concepts of depositional sequence analysis, derived from seismic stratigraphy, have been applied to the Upper Proterozoic and Lower Cambrian Brigham Group, an apparently conformable succession of fluvial to shallow-marine quartzite, conglomerate, mudstone, and subordinate volcanic rocks, as much as 5000 m thick, and cropping out in western Utah and southeastern Idaho. Detailed stratigraphic logs and facies mapping in the Wasatch, Sheeprock, Drum, and Canyon Ranges suggest the presence of 4 or perhaps 5 regional unconformities or sequence boundaries. Stratigraphic relations such as onlap and truncation tend to be subtle, and in most places they are distinguished with difficulty from faulted contacts. Most of the sequence boundaries identified correspond with formation contacts, because sequence boundaries cannot be readily detected when underlying and overlying facies are the same; other formation contacts, defined by arbitrary cut-off between laterally intertonguing facies or by gradational changes in the lithology of quartzite, are not a sequence boundaries. The results from the Brigham Group are significant because they suggest a new way of establishing time correlation in unfossiliferous siliciclastic rocks of Proterozoic age. Several samples of felsic tuff have been collected form the Inkom Formation for U-Pb dating of zircon, but the analyses have not yet been completed.
- Research Organization:
- Columbia Univ., Palisades, NY (USA)
- OSTI ID:
- 6614662
- Report Number(s):
- CONF-8510489-
- Conference Information:
- Journal Name: Geol. Soc. Am., Abstr. Programs; (United States) Journal Volume: 17
- Country of Publication:
- United States
- Language:
- English
Similar Records
Preliminary basin analysis of late Proterozoic-Cambrian post-rift strata, southeast Idaho thrust belt
Sequence boundaries in Proterozoic successions: a comparison of the Brigham Group (Utah) and Wilpena Group (South Australia), with implications for sea-level change and global correlation
Preliminary basin analysis of Late Proterozoic and Early Cambrian Brigham Group, southeastern Idaho
Conference
·
Sat Aug 01 00:00:00 EDT 1987
· AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)
·
OSTI ID:5863995
Sequence boundaries in Proterozoic successions: a comparison of the Brigham Group (Utah) and Wilpena Group (South Australia), with implications for sea-level change and global correlation
Conference
·
Mon Dec 31 23:00:00 EST 1984
· Geol. Soc. Am., Abstr. Programs; (United States)
·
OSTI ID:6654629
Preliminary basin analysis of Late Proterozoic and Early Cambrian Brigham Group, southeastern Idaho
Conference
·
Fri Aug 01 00:00:00 EDT 1986
· Am. Assoc. Pet. Geol., Bull.; (United States)
·
OSTI ID:7042144
Related Subjects
58 GEOSCIENCES
580100* -- Geology & Hydrology-- (-1989)
580203 -- Geophysics-- Geophysical Survey Methods-- (1980-1989)
AGE ESTIMATION
ALLUVIAL DEPOSITS
CAMBRIAN PERIOD
CORRELATIONS
DEPOSITION
FEDERAL REGION VIII
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
GEOLOGIC HISTORY
GEOLOGY
GEOPHYSICAL SURVEYS
IGNEOUS ROCKS
ISOTOPE DATING
NORTH AMERICA
PALEOZOIC ERA
PRECAMBRIAN ERA
ROCKS
SEDIMENTARY ROCKS
SEISMIC SURVEYS
STRATIGRAPHY
SURVEYS
USA
UTAH
VOLCANIC ROCKS
580100* -- Geology & Hydrology-- (-1989)
580203 -- Geophysics-- Geophysical Survey Methods-- (1980-1989)
AGE ESTIMATION
ALLUVIAL DEPOSITS
CAMBRIAN PERIOD
CORRELATIONS
DEPOSITION
FEDERAL REGION VIII
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
GEOLOGIC HISTORY
GEOLOGY
GEOPHYSICAL SURVEYS
IGNEOUS ROCKS
ISOTOPE DATING
NORTH AMERICA
PALEOZOIC ERA
PRECAMBRIAN ERA
ROCKS
SEDIMENTARY ROCKS
SEISMIC SURVEYS
STRATIGRAPHY
SURVEYS
USA
UTAH
VOLCANIC ROCKS