Show simple item record

dc.contributor.advisorDavid McGee.en_US
dc.contributor.authorChen, Christine Y.(Christine Yifeng)en_US
dc.contributor.otherJoint Program in Oceanography/Applied Ocean Science and Engineering.en_US
dc.contributor.otherMassachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences.en_US
dc.contributor.otherWoods Hole Oceanographic Institution.en_US
dc.date.accessioned2020-10-18T21:41:57Z
dc.date.available2020-10-18T21:41:57Z
dc.date.copyright2020en_US
dc.date.issued2020en_US
dc.identifier.urihttps://hdl.handle.net/1721.1/128075
dc.descriptionThesis: Ph. D., Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2020en_US
dc.descriptionCataloged from PDF of thesis. Vita.en_US
dc.descriptionIncludes bibliographical references (pages 181-211).en_US
dc.description.abstractCarbonates are prevalent in many modern and ancient lacustrine settings, but reconstructions of past lake levels or environments from such materials have been hindered by poor chronology. Uranium-thorium (U-Th) dating has the potential to fill a gap in current geochronological tools for such archives, but past attempts have been confounded by poor understanding of the complex makeup of lacustrine carbonates, leading to misguided conclusions on both the utility of certain geochronological tools as well as the age of these deposits. This thesis showcases strategies for the successful application of U-Th geochronology to two types of lacustrine carbonates: lake bottom sediments and tufa deposits. Chapter 2 presents a systematic approach to U-Th dating carbonate-rich lake sediments using the ICDP sediment core from Lake Junín, Peru.en_US
dc.description.abstractChapters 3-5 seek to demonstrate the descriptive power of combining precise U-Th dates on tufas and other carbonates with geologic observations of their depositional context at all scales-from the outcrop to the microscale. Here, the tufas originate from a transect of closed-basin lakes in the central Andes of northern Chile. With improved sample selection and leveraging of the incontrovertible constraints of stratigraphy and coevality, we are able to test the validity of U-Th data. Combining quality-controlled geochronological constraints with careful characterization of different carbonate facies can yield new insight on the character of lake level changes. These case studies offer frameworks for interpreting scattered geochronologic data of any size or system. By embracing the noise in our data, we now have a richer understanding of the controls on uranium in these deposits.en_US
dc.description.abstractOf all the lessons learned, we hold the following as most important: for the determination of the age of lacustrine carbonates, geologic context--in the form of sedimentological observations, additional geochemical data, and paleoecological descriptions--is of equal importance to the numerical accuracy and precision of geochronological measurements.en_US
dc.description.statementofresponsibilityby Christine Y. Chen.en_US
dc.format.extent211 pagesen_US
dc.language.isoengen_US
dc.publisherMassachusetts Institute of Technologyen_US
dc.rightsMIT theses may be protected by copyright. Please reuse MIT thesis content according to the MIT Libraries Permissions Policy, which is available through the URL provided.en_US
dc.rights.urihttp://dspace.mit.edu/handle/1721.1/7582en_US
dc.subjectJoint Program in Oceanography/Applied Ocean Science and Engineering.en_US
dc.subjectEarth, Atmospheric, and Planetary Sciences.en_US
dc.subjectWoods Hole Oceanographic Institution.en_US
dc.titleU-Th dating of lacustrine carbonatesen_US
dc.typeThesisen_US
dc.description.degreePh. D.en_US
dc.contributor.departmentJoint Program in Oceanography/Applied Ocean Science and Engineeringen_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciencesen_US
dc.contributor.departmentWoods Hole Oceanographic Institutionen_US
dc.identifier.oclc1199138805en_US
dc.description.collectionPh.D. Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution)en_US
dspace.imported2020-10-18T21:41:45Zen_US
mit.thesis.degreeDoctoralen_US
mit.thesis.departmentEAPSen_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record