Title: Geologic map of the southern part of the White Cloud Point quadrangle, White Pine County, Nevada
Author: Jeffrey Lee
Year: 2023
Series: Open-File Report 2023-07
Version:
Format: map sheet: 30 x 19.5 inches, color; text: 5 pages, b/w
Scale: 1:24,000
This 1:24,000-scale geologic map of the southern part of the White Cloud Point 7.5-minute quadrangle is located along the northwest tip of the northern Snake Range metamorphic core complex and the northeastern part of Spring Valley. The northern Snake Range metamorphic core complex exposes a low-angle normal slip detachment fault, the northern Snake Range décollement (NSRD), that juxtaposes an upper plate of unmetamorphosed Middle Cambrian to Permian miogeoclinal rocks cut by normal faults and a lower plate dominated by metamorphosed and ductilely thinned and stretched Neoproterozoic to Middle Cambrian metaclastic and marble rocks intruded by Mesozoic and Cenozoic plutons and dikes.
In the map area, the lower plate to the NSRD is composed of Early to Middle Cambrian metaclastic and marble rocks and crosscutting late Eocene rhyolite porphyry dikes. The late Eocene–late Oligocene ductile thinning and stretching deformation fabrics, characteristic of most of the lower plate exposed across the northern Snake Range (Lee et al., 2017), die out in the map area. On the western flank of the range, Lower Cambrian metaclastic rocks expose an older penetrative deformational fabric, defined by a foliation that dips more steeply west compared to bedding. The intersection of these two planes defines a NNW-trending intersection lineation. Quartz grains in the quartzites exhibit a stretching lineation along the intersection lineation, defining an intersection-stretching lineation (Lee, 1990). To the east, Middle Cambrian marbles define an isoclinal recumbent syncline. The upper plate to the NSRD is composed of normal faulted Middle to Upper Cambrian, Mississippian, Pennsylvanian, and Permian miogeoclinal rocks intruded by a late Eocene dacite. Exposed across the western and northern parts of the map area are older alluvial deposits of Quaternary age and lacustrine, sand, and gravel deposits equivalent(?) in age to Lake Bonneville. Quaternary normal faults cut the older alluvial deposits.
NBMG open-file reports have not been formally peer reviewed. This geologic map was funded in part by the USGS National Cooperative Geologic Mapping Program under STATEMAP award number G21AC10873.
Suggested citation:
Lee, J., 2023, Geologic map of the southern part of the White Cloud Point quadrangle, White Pine County, Nevada: Nevada Bureau of Mines and Geology Open-File Report 2023-07, scale 1:24,000, 5 p.
© Copyright 2023 The University of Nevada, Reno. All Rights Reserved.
