Show simple item record

Use of high-resolution oxygen isotope sclerochronology of turritellid gastropods to reconstruct seasonal-scale precipitation regimes

dc.contributor.authorScholz, Serena
dc.date.accessioned2022-01-29T18:48:52Z
dc.date.available2022-01-29T18:48:52Z
dc.date.issued2020-04
dc.identifier.urihttps://hdl.handle.net/2027.42/171484en
dc.descriptionThesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Geology or Earth and Environmental Sciences, Department of Earth and Environmental Sciencesen_US
dc.description.abstractDuring the Mid-Miocene Climatic Optimum (MMCO, 14.7-17.3 Ma), global temperatures were warmer than present, and similar to predicted temperatures for the coming century. Limited paleoclimate data exists from the tropics during this period, despite its potential as an analog for future climate conditions. This study presents new subannual stable isotope data (δ18O and δ13C) from a large population of Miocene Turritella gastropods from the Jimol and Castilletes formations of the Guajira peninsula, Colombia. Turritellids are aragonitic marine mollusks that live in shallow coastal waters, and their rapid growth rates allow for high-resolution subannual records. We compare these fossils to modern Turritella gastropods from multiple tropical localities to reconstruct subannual climate conditions. The seasonal range in δ18O in the modern shells correlates with the seasonal variance of local precipitation, once temperature seasonality is accounted for. The Miocene fossils show larger (sometimes >2‰) seasonal variation in δ18O than modern Turritella from the same location, suggesting increased seasonality of precipitation in Miocene northern Colombia relative to today. We propose that this increased seasonality of precipitation was due to a more northerly position of the ITCZ during the Mid-Miocene. The resulting wet Miocene paleoenvironment is in stark contrast to semi-arid conditions on the Guajira Peninsula today, indicating that this area of tropical South America has undergone a drastic environmental change since the Miocene.en_US
dc.language.isoen_USen_US
dc.titleUse of high-resolution oxygen isotope sclerochronology of turritellid gastropods to reconstruct seasonal-scale precipitation regimesen_US
dc.typeArticleen_US
dc.subject.hlbsecondlevelGeological Sciences
dc.subject.hlbtoplevelScience
dc.contributor.affiliationumEarth and Environmental Sciences, Department ofen_US
dc.contributor.affiliationumcampusAnn Arboren_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/171484/1/Scholz_Serena_MSThesis_2020.pdf
dc.identifier.doihttps://dx.doi.org/10.7302/3996
dc.description.mappingc5a42028-499d-4e85-9fdc-dc71e2baca26en_US
dc.description.filedescriptionDescription of Scholz_Serena_MSThesis_2020.pdf : MS thesis
dc.description.depositorSELFen_US
dc.working.doi10.7302/3996en_US
dc.owningcollnameEarth and Environmental Sciences, Department of


Files in this item

Show simple item record

Remediation of Harmful Language

The University of Michigan Library aims to describe library materials in a way that respects the people and communities who create, use, and are represented in our collections. Report harmful or offensive language in catalog records, finding aids, or elsewhere in our collections anonymously through our metadata feedback form. More information at Remediation of Harmful Language.

Accessibility

If you are unable to use this file in its current format, please select the Contact Us link and we can modify it to make it more accessible to you.