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Reappraisal of the relationship between the northern Nevada rift and Miocene extension in the northern Basin and Range Province

Geology

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DOI: 10.1130/G33512.1

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Abstract

The northern Nevada rift is a prominent mafic dike swarm and magnetic anomaly in north-central Nevada inferred to record the Middle Miocene (16.5-15.0 Ma) extension direction in the northern Basin and Range province in the western United States. From the 245°-250° rift direction, Basin and Range extension is inferred to have shifted 45° clockwise to a modern direction of 290°-300° during the late Miocene. The region surrounding the northern Nevada rift was actively extending while the rift formed, and these domains are all characterized by extension oriented 280°-300°. This direction is distinctly different from the rift direction and nearly identical to the modern Basin and Range direction. Although the rate, structural style, and distribution of Basin and Range extension appear to have undergone a significant change in the late Miocene (ca. 10 Ma), the overall spreading direction does not. Middle Miocene extension was directed perpendicular to the axis of the thickest crust formed during Mesozoic shortening and this orientation may reflect gravitational collapse of this thick crust. Orientation of northern Nevada rift dikes may reflect a short-lived regional stress field related to the onset of Yellowstone hotspot volcanism.

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Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Reappraisal of the relationship between the northern Nevada rift and Miocene extension in the northern Basin and Range Province
Series title:
Geology
DOI:
10.1130/G33512.1
Volume
41
Issue:
2
Year Published:
2013
Language:
English
Publisher:
Geological Society of America
Contributing office(s):
Earthquake Science Center
Description:
4 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geology
First page:
211
Last page:
214
Country:
United States
State:
California;Idaho;Montana;Nevada;Oregon;Utah;Washington;Wyoming