The Resource Detrital zircon geochronology of the Upper Miocene Boleo Formation in the Santa Rosalia, Baja California Sur, Mexico, by Matthew William Henry

Detrital zircon geochronology of the Upper Miocene Boleo Formation in the Santa Rosalia, Baja California Sur, Mexico, by Matthew William Henry

Label
Detrital zircon geochronology of the Upper Miocene Boleo Formation in the Santa Rosalia, Baja California Sur, Mexico
Title
Detrital zircon geochronology of the Upper Miocene Boleo Formation in the Santa Rosalia, Baja California Sur, Mexico
Statement of responsibility
by Matthew William Henry
Creator
Contributor
Author
Degree supervisor
Subject
Genre
Language
eng
Summary
The Santa Rosalía Basin (SRB), Baja California Sur, is a transtentional to rift basin that formed during the opening of the Gulf of California. The Boleo Formation is the oldest and dominant sedimentary fill of the SRB, but its age is poorly constrained. We carried out a U-Pb detrital zircon study of the Boleo Formation to constrain its maximum depositional age. The Boleo Formation has basal limestone and gypsum sections that may be time transgressive. These are overlain by a much thicker clastic sequence, with coarsening upward cycles of mudstone, sandstone, and conglomerate. The formation also includes bedded Cu-Zn-Co-Mn ore deposits (known as mantos) that cap the conglomerate on each cycle, numbered 1, 2, 3 and 4 (from top to bottom of section). Sandstone samples were collected for U-Pb detrital zircon geochronology below each manto and in a clastic layer within the gypsum. A field wash table was constructed as a first step to concentrate heavy minerals and further processed in the lab using standard zircon separation methods yielding roughly 1,000 zircons per sample. We analyzed 315 zircons per sample by LA-ICPMS. Detrital zircon U-Pb ages from the Boleo Formation range dominantly from Late Miocene through Early Cretaceous, with minor Paleozoic and Precambrian ages. Only 5 to 22 grains per sample are less than 1̃0 Ma, and of those, all stratigraphic levels are dominated mostly by 9̃ Ma zircons, except for the stratigraphically highest sample. Zircons from the top section of the Boleo Formation form a coherent group of 3 with a TuffZirc age of 5.5-5.7 Ma and an age of 8.9 (+0.04/-0.10) Ma for the base. The 8.9 Ma below the lowest copper bed and limestone in the Boleo Formation marks the maximum age of the inception of the Santa Rosalia basin which is also constrained by underling rift transition volcanic rocks. These zircon-based age results indicate the existence of a seaway in the gulf region after 8.9 Ma and certainly by 5.5-5.7 Ma paralleling Late Miocene crustal extension in the Gulf of California and development of the offshore Guaymas Basin
Cataloging source
UMK
http://library.link/vocab/creatorDate
1983-
http://library.link/vocab/creatorName
Henry, Matthew William
Degree
M.S.
Dissertation note
(Department of Geosciences).
Dissertation year
2019.
Granting institution
University of Missouri-Kansas City,
Illustrations
illustrations
Index
no index present
Literary form
non fiction
Nature of contents
  • dictionaries
  • bibliography
  • theses
http://library.link/vocab/relatedWorkOrContributorName
Niemi, Tina M.
http://library.link/vocab/subjectName
  • Santa Rosalía (Baja California Sur, Mexico)
  • Geology, Stratigraphic
  • Zircon
Label
Detrital zircon geochronology of the Upper Miocene Boleo Formation in the Santa Rosalia, Baja California Sur, Mexico, by Matthew William Henry
Instantiates
Publication
Copyright
Note
  • "A thesis in Environmental and Urban Geosciences."
  • Advisor: Tina M. Niemi
  • Vita
Antecedent source
not applicable
Bibliography note
Includes bibliographical references (pages 94-103)
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Color
black and white
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Contents
Introduction -- Background -- Methodology -- Results -- Discussion -- Conclusion -- Appendix A. U-Th-Pb decay system -- Appendix B. Isochron dates from Busby et al., 2018 -- Appendix C. Stratigraphic columns from sample collection outcrops within the Boleo Fm -- Appendix D. Final weights of samples after field processing -- Appendix E. Elemental mapped sample images -- Appendix F. Intensities for 206/238, after Ludwig (2012) -- Appendix G. Concordia diagrams for all six samples (<20 Ma) -- Appendix H. Histograms on ages of all six samples -- Appendix I. Data for detrital all six samples -- Appendix J. Map with sample location of this study and Busby et al. (2018, in revision)
Control code
1155044940
Dimensions
unknown
Extent
1 online resource (104 pages)
File format
one file format
Form of item
online
Level of compression
mixed
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations.
Quality assurance targets
not applicable
Specific material designation
remote
System control number
(OCoLC)1155044940
System details
  • The full text of the thesis is available as an Adobe Acrobat .pdf file; Adobe Acrobat Reader required to view the file
  • Mode of access: World Wide Web
Label
Detrital zircon geochronology of the Upper Miocene Boleo Formation in the Santa Rosalia, Baja California Sur, Mexico, by Matthew William Henry
Publication
Copyright
Note
  • "A thesis in Environmental and Urban Geosciences."
  • Advisor: Tina M. Niemi
  • Vita
Antecedent source
not applicable
Bibliography note
Includes bibliographical references (pages 94-103)
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Color
black and white
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Contents
Introduction -- Background -- Methodology -- Results -- Discussion -- Conclusion -- Appendix A. U-Th-Pb decay system -- Appendix B. Isochron dates from Busby et al., 2018 -- Appendix C. Stratigraphic columns from sample collection outcrops within the Boleo Fm -- Appendix D. Final weights of samples after field processing -- Appendix E. Elemental mapped sample images -- Appendix F. Intensities for 206/238, after Ludwig (2012) -- Appendix G. Concordia diagrams for all six samples (<20 Ma) -- Appendix H. Histograms on ages of all six samples -- Appendix I. Data for detrital all six samples -- Appendix J. Map with sample location of this study and Busby et al. (2018, in revision)
Control code
1155044940
Dimensions
unknown
Extent
1 online resource (104 pages)
File format
one file format
Form of item
online
Level of compression
mixed
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations.
Quality assurance targets
not applicable
Specific material designation
remote
System control number
(OCoLC)1155044940
System details
  • The full text of the thesis is available as an Adobe Acrobat .pdf file; Adobe Acrobat Reader required to view the file
  • Mode of access: World Wide Web

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