Alexandria Digital Research Library

Interactions of tectonics, climate, and deposition in intermontane basins on the margin of the Puna Plateau, NW Argentina

Author:
Jiron, Rebecca Lydia
Degree Supervisor:
Douglas W. Burbank
Place of Publication:
[Santa Barbara, Calif.]
Publisher:
University of California, Santa Barbara
Creation Date:
2015
Issued Date:
2015
Topics:
Geomorphology, Geology, and Sedimentary geology
Keywords:
Andes
Stratigraphy
Structural geology
Tectonics and climate
Intermontane basin
U-Pb geochronology
Genres:
Online resources and Dissertations, Academic
Degree Grantor:
University of California, Santa Barbara. Geological Sciences
Dissertation:
Ph.D.--University of California, Santa Barbara, 2015
Description:

Intermontane basins are illuminating stratigraphic archives of deformation, denudation, and environmental conditions within the heart of actively growing mountain ranges. Commonly, however, it is difficult to determine from the sedimentary record of an individual basin whether basin formation, aggradation, and dissection were controlled primarily by climatic, tectonic, or lithological changes and whether these drivers were local or regional in nature. By comparing the onset of deposition, sediment-accumulation rates, incision, deformation, changes in fluvial connectivity, and sediment provenance in two interrelated intermontane basins, we can identify diverse controls on basin evolution. This work focuses on the Humahuaca basin and the Casa Grande basin, two adjacent intermontane basins currently connected by a bedrock gorge through the Sierra Alta, in the Eastern Cordillera of NW Argentina at ∼23-24°S. We combine detailed geologic mapping, stratigraphic analysis of measured sections, provenance data, and geochronology to reconstruct the history of deformation, deposition, basin isolation, and incision in these basins. The exceptional time control provided by U-Pb geochronology of numerous volcanic ashes contained within the Neogene-Quaternary basin fill combined with an unambiguous magnetostratigraphic record in the Humahuaca basin enables the comparison of multiple types of datasets, e.g., sediment-accumulation rates, timing of deformation on individual faults, detrital zircon provenance, paleocurrents ,and sedimentary facies, from both basins to discriminate between potential controls on specific events in each basin's history.

Physical Description:
1 online resource (199 pages)
Format:
Text
Collection(s):
UCSB electronic theses and dissertations
ARK:
ark:/48907/f3tb16dx
ISBN:
9781339471778
Catalog System Number:
990046179810203776
Rights:
Inc.icon only.dark In Copyright
Copyright Holder:
Rebecca Jiron
File Description
Access: Public access
Jiron_ucsb_0035D_12800.pdf pdf (Portable Document Format)
Table S1 - LA-ICPMS zircon U-Pb geochronology data from ashes.xlsx vnd.openxmlformats-officedocument.spreadsheetml.sheet (Microsoft Excel 2007+, OpenDocument Text, Office Open XML Workbook)
Table S2 - Magnetostratigraphy data.xlsx vnd.openxmlformats-officedocument.spreadsheetml.sheet (Microsoft Excel 2007+, OpenDocument Text, Office Open XML Workbook)
Table S3 - Detrital zircon data.xlsx vnd.openxmlformats-officedocument.spreadsheetml.sheet (Microsoft Excel 2007+, OpenDocument Text, Office Open XML Workbook)
Table S4 - Structural data.xls vnd.ms-excel (Microsoft Excel)