Depositional setting and paleogeography of Ordovician Vinini Formation, central Nevada
Conference
·
· AAPG Bulletin (American Association of Petroleum Geologists); (United States)
OSTI ID:5200444
- California State Univ., Long Beach (United States)
The eugeoclinal strata of the Ordovician Vinini Formation composes most of the Roberts Mountains allochthon (RMA). Its stratigraphy, reconstructed in the Roberts Mountains, can be precisely correlated throughout much of the RMA and into coeval strata of the autochthonous miogeocline by means of graptolite and conodont biostratigraphy. The Vinini is a mixture of clastic lithologies with some limestone and greenstone. Coarse clastics, characterized by well-rounded and well-sorted sands derived from cratonic sources, occur in two separate intervals and provide critical data on depositional and paleogeographic setting. The lower interval, hundreds of meters thick, was deposited in the latest Ibexian-earliest Whiterockian and can be closely correlated throughout central Nevada. It is a mixture of quartz sandstone, siltstone, limestone, and calcareous sandstone, deposited by turbidity flows during a lowstand of sea level. Both eastern and western sources have been interpreted for these sands. The upper interval is a prominent, pure quartzite up to 20 m thick deposited as a prograding blanket of sand in the latest Whiterockian-earliest Mohawkian. It occurs in the Vinini in the northern Toquima Range and in a parautochthonous sequence of transitional strata in the southern Toiyabe Range. This interval represents the most basinward edge of the Eureka Quartzite, which was also deposited across the miogeocline. The presence of sand of the Eureka Quartzite in the RMA indicates that the basin in which the RMA strata were deposited was immediately adjacent to the margin of North America in the Ordovician.
- OSTI ID:
- 5200444
- Report Number(s):
- CONF-9103128--
- Conference Information:
- Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Journal Volume: 75:2
- Country of Publication:
- United States
- Language:
- English
Similar Records
Paleogeography and evolution of the Ordovician/Silurian (Whiterockian-Llandoverian) continental margin in central Nevada
Shelf-bypass route for lower Whiterockian quartz sandstones of Vinini Formation in Roberts Mountains, central Nevada
Paleozoic stratigraphy and tectonics in northernmost Nevada: Implications for the nature of the Antler orogeny
Conference
·
Thu Jan 31 23:00:00 EST 1991
· AAPG Bulletin (American Association of Petroleum Geologists); (United States)
·
OSTI ID:5141833
Shelf-bypass route for lower Whiterockian quartz sandstones of Vinini Formation in Roberts Mountains, central Nevada
Conference
·
Wed Mar 31 23:00:00 EST 1993
· Geological Society of America, Abstracts with Programs; (United States)
·
OSTI ID:5290054
Paleozoic stratigraphy and tectonics in northernmost Nevada: Implications for the nature of the Antler orogeny
Conference
·
Wed Mar 31 23:00:00 EST 1993
· Geological Society of America, Abstracts with Programs; (United States)
·
OSTI ID:5022951
Related Subjects
58 GEOSCIENCES
580000* -- Geosciences
CARBONATE ROCKS
CORRELATIONS
DEPOSITION
DEVELOPED COUNTRIES
FEDERAL REGION IX
GEOLOGIC AGES
GEOLOGIC FORMATIONS
GEOLOGIC HISTORY
GEOLOGY
LIMESTONE
LITHOLOGY
NEVADA
NORTH AMERICA
ORDOVICIAN PERIOD
PALEONTOLOGY
PALEOZOIC ERA
ROCKS
SEDIMENTARY ROCKS
STRATIGRAPHY
USA
580000* -- Geosciences
CARBONATE ROCKS
CORRELATIONS
DEPOSITION
DEVELOPED COUNTRIES
FEDERAL REGION IX
GEOLOGIC AGES
GEOLOGIC FORMATIONS
GEOLOGIC HISTORY
GEOLOGY
LIMESTONE
LITHOLOGY
NEVADA
NORTH AMERICA
ORDOVICIAN PERIOD
PALEONTOLOGY
PALEOZOIC ERA
ROCKS
SEDIMENTARY ROCKS
STRATIGRAPHY
USA