CONSTRAINTS ON THE DEPOSITIONAL AGES OF LESSER HIMALAYAN ROCKS IN CENTRAL NEPAL AND THEIR STRUCTURAL IMPLICATIONS

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dc.contributor.advisorMartin, Aaronen_US
dc.contributor.authorBurgy, Katherine Dianeen_US
dc.contributor.departmentGeologyen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2013-07-10T05:30:31Z
dc.date.available2013-07-10T05:30:31Z
dc.date.issued2009en_US
dc.description.abstractThe lack of good exposures and paucity of datable horizons in central Nepal has hindered the ability of geologists to piece together a relatively cohesive and straightforward stratigraphic succession within the Lesser Himalaya. U-Pb isotopic analyses of detrital zircons from the Modi Khola valley indicates maximum depositional ages of ~1875 Ma for the Kuncha Formation, ~1800 Ma for the Fagfog Formation, and ~ 1780 Ma for the Kushma Formation. The intrusive 1831 ± 17 Ma Ulleri augen gneiss provides a minimum depositional age bound for the Kuncha. Combined, these data suggest the Kuncha Formation is the oldest member of the Lesser Himalayan series in central Nepal. Additionally, 13C data suggest the Malekhu Formation of the Lakharpata Group was deposited before ca. 1250 Ma. A field mapping comparison based on the redefined stratigraphy indicates the Ramgarh thrust is located >10 km farther south than previously mapped, potentially reducing regional shortening estimates.en_US
dc.identifier.urihttp://hdl.handle.net/1903/14376
dc.subject.pqcontrolledGeologyen_US
dc.subject.pqcontrolledPetrologyen_US
dc.subject.pqcontrolledGeochemistryen_US
dc.subject.pquncontrolledDetritalen_US
dc.subject.pquncontrolledHimalayaen_US
dc.subject.pquncontrolledModi Kholaen_US
dc.subject.pquncontrolledNepalen_US
dc.subject.pquncontrolledStratigraphyen_US
dc.subject.pquncontrolledZirconen_US
dc.titleCONSTRAINTS ON THE DEPOSITIONAL AGES OF LESSER HIMALAYAN ROCKS IN CENTRAL NEPAL AND THEIR STRUCTURAL IMPLICATIONSen_US
dc.typeThesisen_US

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