The Santa Cruz River terraces near Tubac, Santa Cruz County, Arizona

Persistent Link:
http://hdl.handle.net/10150/191884
Title:
The Santa Cruz River terraces near Tubac, Santa Cruz County, Arizona
Author:
Helmick, Walter Robert,1950-
Issue Date:
1986
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Nine Quaternary surfaces along the Santa Cruz River reflect degradation subsequent to basin filling. Five alluvial-geomorphic surfaces represent stages of aggradation in a net trend of channel downcutting. Upstream of the mountain-bounding fault, longitudinal surface profiles do not converge in a downstream direction and downstream of this zone there are no thicker sediment wedges. This indicates that the mountain front was tectonically inactive and climatic change initiated shifts from aggradation to degradation. Terrace soils indicate that four major climatic changes have occurred in the region. These changes resulted in downcutting events during the early Pleistocene, mid-Pleistocene, late Pleistocene and early Holocene. The timing of last movement on two piedmont faults indicates that they were active during the late Pleistocene. Oxalate to dithionite extractable iron ratios are a maximum for early Holocene soils, declining to minimum values for early Pleistocene soils.
Type:
Thesis-Reproduction (electronic); text
LCSH Subjects:
Hydrology.; Terraces (Geology) -- Arizona -- Tubac Region.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Geosciences; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Bull, William B.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleThe Santa Cruz River terraces near Tubac, Santa Cruz County, Arizonaen_US
dc.creatorHelmick, Walter Robert,1950-en_US
dc.contributor.authorHelmick, Walter Robert,1950-en_US
dc.date.issued1986en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractNine Quaternary surfaces along the Santa Cruz River reflect degradation subsequent to basin filling. Five alluvial-geomorphic surfaces represent stages of aggradation in a net trend of channel downcutting. Upstream of the mountain-bounding fault, longitudinal surface profiles do not converge in a downstream direction and downstream of this zone there are no thicker sediment wedges. This indicates that the mountain front was tectonically inactive and climatic change initiated shifts from aggradation to degradation. Terrace soils indicate that four major climatic changes have occurred in the region. These changes resulted in downcutting events during the early Pleistocene, mid-Pleistocene, late Pleistocene and early Holocene. The timing of last movement on two piedmont faults indicates that they were active during the late Pleistocene. Oxalate to dithionite extractable iron ratios are a maximum for early Holocene soils, declining to minimum values for early Pleistocene soils.en_US
dc.description.notehydrology collectionen_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.subject.lcshHydrology.en_US
dc.subject.lcshTerraces (Geology) -- Arizona -- Tubac Region.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGeosciencesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.chairBull, William B.en_US
dc.contributor.committeememberSchreiber, Joseph F.en_US
dc.contributor.committeememberHendricks, David M.en_US
dc.identifier.oclc213298119en_US
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