Northwest vergent folding in the Harmony Formation, north central Nevada: Lower Paleozoic tectonics revisited
Conference
·
· Geological Society of America, Abstracts with Programs; (United States)
OSTI ID:5100222
The Upper Cambrian to Lower Ordovician Harmony Formation is an arkosic sandstone composed of coarse graded beds of turbiditic sandstone, siltstone and shale that crops out at Battle Mountain, the Sonoma Range, and the Hot Springs Range of north central Nevada. Regional mapping by Hotz and Willden in 1964 suggested that west vergent folding was the main structural feature of the Harmony Formation in the Hot Springs Range. In this study, over 1,600 bedding measurements in the Harmony Formation have been collected in the Hot Springs Range. 300 of these measurements include positively defined facing directions. A stereo plot of poles to bedding falls along a great circle with a pole at N36E, plunging 23[degree]NE. A well defined cluster of poles to overturned beds along the northwestern part of the great circle confirms the report by Hotz and Willden, and indicates bedding overturned toward the northwest. Important conclusions from this data set are (1) the fold orientations in the Harmony Formation and the Valmy Formation in the Hot Springs Range are clearly different, (2) the east-vergent deformation reported by others in rocks of the Roberts Mountains terrane did not affect the Harmony Formation in the Hot Springs Range and therefore (3) major Paleozoic structural boundaries between the Harmony Formation and rocks of Roberts Mountains terrane must exist. Both the Harmony Formation and the Roberts Mountains terrane are unconformably overlain by Pennsylvanian rocks indicating a pre-Pennsylvanian age for both deformation events. The different pre-Pennsylvanian structural characteristics of these two terranes demonstrate that they evolved with separate pre-Pennsylvanian tectonic histories.
- OSTI ID:
- 5100222
- Report Number(s):
- CONF-9305259--
- Conference Information:
- Journal Name: Geological Society of America, Abstracts with Programs; (United States) Journal Volume: 25:5
- Country of Publication:
- United States
- Language:
- English
Similar Records
Devono-Mississippian sedimentary environments at the type Antler orogen at Battle Mountain, Nevada
Paleozoic stratigraphy and tectonics in northernmost Nevada: Implications for the nature of the Antler orogeny
U-Pb detrital zircon geochronology of the Harmony Formation, central Nevada
Conference
·
Mon Dec 31 23:00:00 EST 1984
· Geol. Soc. Am., Abstr. Programs; (United States)
·
OSTI ID:6461694
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
U-Pb detrital zircon geochronology of the Harmony Formation, central Nevada
Conference
·
Mon Dec 31 23:00:00 EST 1984
· Geol. Soc. Am., Abstr. Programs; (United States)
·
OSTI ID:5811511