Show simple item record

dc.contributor.advisorSchreiber, J. F. Jr.en_US
dc.contributor.authorBalcer, Richard Allen
dc.date.accessioned2012-09-15T01:50:01Z
dc.date.available2012-09-15T01:50:01Z
dc.date.issued1984
dc.identifier.urihttp://hdl.handle.net/10150/244091
dc.description.abstractThe Pantano Formation comprises 1,250 m of alluvial, fluvial, lacustrine, and volcanic rocks deposited in a basin formed in response to regional extension during mid- Tertiary time in southeastern Arizona. During deposition, the locations and composition of sediment source areas varied as contemporaneous uplift occurred adjacent to the basin. The lower half of the formation was deposited as alluvial fans that prograded northward, westward, and southward; the upper half was deposited during southwestward retreat of alluvial fan deposition and the onset of lacustrine deposition. An andesite flow separates the two depositional regimes. Radiometric dates of 24.4 ± 2.6 m.y. B.P. for the andesite and 36.7 ± 1.1 m.y. B.P. for a rhyolitic tuff disconformably underlying the formation indicate that deposition occurred during Oligocene to early Miocene time. Proper stratigraphic sequencing and description, paleocurrent analysis, and gravel provenance study aided in understanding the depositional history of the formation.
dc.language.isoen_USen_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 Antevs Library, Department of Geosciences, and 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 or the department.en_US
dc.subjectabsolute ageen_US
dc.subjectalluvial fansen_US
dc.subjectandesitesen_US
dc.subjectArizonaen_US
dc.subjectBasin and Range Provinceen_US
dc.subjectbasinsen_US
dc.subjectCenozoicen_US
dc.subjectdatesen_US
dc.subjectenvironmenten_US
dc.subjectgeochronologyen_US
dc.subjectigneous rocksen_US
dc.subjectinterpretationen_US
dc.subjectlacustrine environmenten_US
dc.subjectMioceneen_US
dc.subjectNeogeneen_US
dc.subjectNorth Americaen_US
dc.subjectPaleogeneen_US
dc.subjectPantano Formationen_US
dc.subjectPima County Arizonaen_US
dc.subjectprovenanceen_US
dc.subjectrhyolitesen_US
dc.subjectsedimentary basinsen_US
dc.subjectsedimentary rocksen_US
dc.subjectsedimentationen_US
dc.subjectsouthern Arizonaen_US
dc.subjectterrestrial environmenten_US
dc.subjectTertiaryen_US
dc.subjectUnited Statesen_US
dc.subjectvolcanic rocksen_US
dc.subjectGeology, Stratigraphic -- Mioceneen_US
dc.subjectGeology, Stratigraphic -- Oligoceneen_US
dc.subjectSedimentation and deposition -- Arizona -- Cienega Gap Regionen_US
dc.subjectSedimentation and deposition -- Arizona -- Pima Countyen_US
dc.titleStratigraphy and Depositional History of the Pantano Formation (Oligocene-Early Miocene), Pima County, Arizonaen_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.contributor.chairSchreiber, J. F. Jr.en_US
dc.identifier.oclc11848541
thesis.degree.grantorUniversity of Arizonaen_US
thesis.degree.levelmastersen_US
dc.contributor.committeememberDickinson, W. R.en_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineGeosciencesen_US
thesis.degree.nameM.S.en_US
dc.description.noteAntevs Libraryen_US
dc.description.collectioninformationThis item is part of the Geosciences Theses collection. It was digitized from a physical copy provided by the Antevs Library, Department of Geosciences, University of Arizona. For more information about items in this collection, please email the Antevs Library, antevs@geo.arizona.edu.en_US
dc.contributor.creatorBalcer, Richard Allenen_US
dc.identifier.georef1985-081718
refterms.dateFOA2018-04-05T01:28:10Z
html.description.abstractThe Pantano Formation comprises 1,250 m of alluvial, fluvial, lacustrine, and volcanic rocks deposited in a basin formed in response to regional extension during mid- Tertiary time in southeastern Arizona. During deposition, the locations and composition of sediment source areas varied as contemporaneous uplift occurred adjacent to the basin. The lower half of the formation was deposited as alluvial fans that prograded northward, westward, and southward; the upper half was deposited during southwestward retreat of alluvial fan deposition and the onset of lacustrine deposition. An andesite flow separates the two depositional regimes. Radiometric dates of 24.4 ± 2.6 m.y. B.P. for the andesite and 36.7 ± 1.1 m.y. B.P. for a rhyolitic tuff disconformably underlying the formation indicate that deposition occurred during Oligocene to early Miocene time. Proper stratigraphic sequencing and description, paleocurrent analysis, and gravel provenance study aided in understanding the depositional history of the formation.


Files in this item

Thumbnail
Name:
azu_td_geo_0036_sip1_pg108_m.tif
Size:
220.7Mb
Format:
TIFF image
Description:
Geologic Map of a Portion of ...
Thumbnail
Name:
azu_td_geo_0036_sip1_w.pdf
Size:
12.22Mb
Format:
PDF
Description:
Master's Thesis Full PDF

This item appears in the following Collection(s)

Show simple item record