The UA Campus Repository is experiencing systematic automated, high-volume traffic (bots). Temporary mitigation measures to address bot traffic have been put in place; however, this has resulted in restrictions on searching WITHIN collections or using sidebar filters WITHIN collections. You can still Browse by Title/Author/Year WITHIN collections. Also, you can still search at the top level of the repository (use the search box at the top of every page) and apply filters from that search level. Export of search results has also been restricted at this time. Please contact us at any time for assistance - email repository@u.library.arizona.edu.

Show simple item record

Apatite and zircon fission-track dates from the northern Plomosa Mountains, La Paz County, west-central Arizona

dc.contributor.authorFoster, D.A.
dc.contributor.authorSpencer, J.E.
dc.date.accessioned2018-09-29T02:09:21Z
dc.date.available2018-09-29T02:09:21Z
dc.date.issued1992-10-13
dc.identifier.citationFoster, D.A. and Spencer, J.E., 1992, Apatite and zircon fission-track dates from the northern Plomosa Mountains, La Paz County, west-central Arizona. Arizona Geological Survey Open File Report, OFR-92-09, 11 p.
dc.identifier.urihttp://hdl.handle.net/10150/629648
dc.descriptionFission-track thermochronologic data have the potential to reveal aspects of the timing, rate, and style of crustal extension tectonics. Previous fission-track studies in the footwalls of detachment faults in the Basin and Range Province of western North America have found monotonic decreases in apparent fission-track age in the slip direction of the faults (e.g., Fitzgerald and others, 1991; Foster and others, 1991, in press). This pattern has been interpreted as recording the time at which progressively deeper parts of the footwalls to the detachments have moved through the annealing zone for fission-tracks in apatite. In this study we analyzed fission-tracks in apatite and zircon from samples of Proterozoic crystalline rock from a south to north transect across the northern Plomosa Mountains, Arizona (Figure 1). The transect runs from about 100 meters structurally below the Tertiary unconformity (DF90-226) north to the deepest exposed structural levels in the range (DF90-220) beneath the Tertiary Plomosa detachment fault (Scarborough and Meader, 1981). In addition, one sample (DF90-221) is from a detached block of basement in the hanging wall of the Plomosa fault in the northern-most part of the range. The fission-track data from these samples constrain the low temperature (<250 C) thermal history of the northern Plomosa Mountains and have implications for the timing and rate of displacement on the Plomosa detachment. The data also have implications for nature of extension in this range which occupied a position near the breakaway region for detachments in the Whipple tilt domain (Spencer and Reynolds, 1991). ( 11 pages )
dc.language.isoen
dc.relation.ispartofseriesOFR-92-09
dc.relation.urlhttps://library.azgs.arizona.edu/
dc.rightsArizona Geological Survey. All rights reserved.
dc.subjectArizona Geological Survey Open File Reports
dc.subjectPlomosa Mountains
dc.subjectLa Paz County
dc.subjectArizona
dc.subjectfaults
dc.subjectcrustal extension tectonics
dc.subjectfission-tracking
dc.subjectzircon
dc.subjectapatite
dc.subjectProterozoic
dc.subjectBasin and Range Province
dc.subjectdetachment fault
dc.titleApatite and zircon fission-track dates from the northern Plomosa Mountains, La Paz County, west-central Arizona
csdgm.bounding.west-113.752
csdgm.bounding.east-113.148
csdgm.bounding.north34.2254
csdgm.bounding.south33.7883
dc.description.collectioninformationDocuments in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu.
refterms.dateFOA2018-09-29T02:09:21Z


Files in this item

Thumbnail
Name:
OFR_92_9.pdf
Size:
1.094Mb
Format:
PDF
Download

This item appears in the following Collection(s)

Show simple item record