Geologic map of the Vigo NE quadrangle, Lincoln County, Nevada
Dataset Identification:
Resource Abstract:
This map of the Vigo NE quadrangle, Lincoln County, Nevada records the distribution, stratigraphy, and structural relationships
of Tertiary intracaldera lavas and tuffs in the southeastern part of the Kane Springs Wash caldera, extracaldera Tertiary
and upper Paleozoic rocks, and late Cenozoic surficial deposits both within and outside the caldera. The alkaline to peralkaline
Kane Springs Wash caldera is the youngest (14 Ma) of three chemically related metaluminous to peralkaline calderas (Boulder
Canyon caldera, 15 Ma; Narrow Canyon caldera, 16 Ma) of the nested Kane Springs Wash caldera complex. The chemistry of this
caldera complex became progressively more alkalic with time, in contrast to the older calc-alkalic calderas and caldera complexes
to the north that migrated progressively southward in eastern Nevada. The increasingly peralkaline eruptions from the Kane
Springs Wash caldera complex reached a climax that was simultaneous with the end of both rapid extension and magmatism in
this part of the Basin and Range. Using the assumption that degree of tilting is related to the degree of extension, the rate
of extension increased until the abrupt halt at about 14 Ma. Silicic volcanism terminated at the Kane Springs Wash caldera
followed only by local sporadic basaltic eruptions that ended by about 8 Ma. The northern boundary of an east-west-trending
amagmatic corridor appears in the Vigo NE quadrangle south of the Kane Springs Wash caldera.
Citation
Title Geologic map of the Vigo NE quadrangle, Lincoln County, Nevada