Complex Garnet Zoning from Lawsonite Eclogite from South of the Motagua Suture Zone, Guatemala

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dc.contributor.advisorLapen, Thomas J.
dc.contributor.committeeMemberSisson, Virginia B.
dc.contributor.committeeMemberRobinson, Alexander C.
dc.contributor.committeeMemberKhan, Shuhab D.
dc.contributor.committeeMemberHarlow, George E.
dc.creatorBradley, Deborah 1985-
dc.date.accessioned2020-01-04T03:49:10Z
dc.date.createdMay 2019
dc.date.issued2019-05
dc.date.submittedMay 2019
dc.date.updated2020-01-04T03:49:11Z
dc.description.abstractSerpentinite mélange of the Guatemalan suture zone hosts the exhumed remains of one of the coldest subduction zones in the world. The mélange contains several different metamorphic rocks, including lawsonite eclogite. Well-preserved lawsonite eclogite is particularly rare, and is preserved only in high-pressure, low-temperature metamorphism wherein exhumation is rapid. Though lawsonite eclogite is well-preserved, the full extent of the P-T-t path this HP-LT rock experienced is contentious, with two competing proposed P-T paths: one with a prograde path with garnet growth from 300 to 480 °C at 1.1-2.6 GPa, and another with a prograde path from 470 to 520 °C at 2-2.5 GPa. Combining major, trace, and rare earth element (REE) garnet concentrations with crystal size distribution analysis, X-ray element maps, REE modeling, and Sm-Nd age data, constraints are placed on the prograde P-T-t path of these HP-LT metabasites. My data reveal a complex zoning in major, trace, and rare earth elements. Core to rim concentration profiles define normal prograde zoning, but deviated from this zoning towards the rim, with restricted regions of complex zoning in garnet compatible elements (e.g., Mn and HREEs), with a decrease of these elements at the rim. This complex zoning is related to changes in bulk composition, fluid availability, and garnet growth rate, which indicates that garnet experienced different stages of growth over a protracted period, perhaps as long as 33 Ma. The overall variability of chemical zoning between eclogite samples in the mélange, it is also apparent that different P-T histories may be recorded in different eclogite blocks.
dc.description.departmentEarth and Atmospheric Sciences, Department of
dc.format.digitalOriginborn digital
dc.format.mimetypeapplication/pdf
dc.identifier.urihttps://hdl.handle.net/10657/5781
dc.language.isoeng
dc.rightsThe author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).
dc.subjectEclogite
dc.subjectGarnet
dc.subjectLawsonite
dc.subjectGuatemala
dc.subjectHP-LT metamorphism
dc.titleComplex Garnet Zoning from Lawsonite Eclogite from South of the Motagua Suture Zone, Guatemala
dc.type.dcmiText
dc.type.genreThesis
local.embargo.lift2021-05-01
local.embargo.terms2021-05-01
thesis.degree.collegeCollege of Natural Sciences and Mathematics
thesis.degree.departmentEarth and Atmospheric Sciences, Department of
thesis.degree.disciplineGeology
thesis.degree.grantorUniversity of Houston
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy

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