Geochemical Diagnostics of Metasedimentary Dark Inclusions: a Case Study from the Peninsular Ranges Batholith, California

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dc.contributor.advisorLee, Cin-Ty A.en_US
dc.contributor.committeeMemberDasgupta, Rajdeepen_US
dc.contributor.committeeMemberLenardic, Adrianen_US
dc.creatorLiao, Kelleyen_US
dc.date.accessioned2013-07-24T19:35:38Zen_US
dc.date.accessioned2013-07-24T19:35:42Zen_US
dc.date.available2013-07-24T19:35:38Zen_US
dc.date.available2013-07-24T19:35:42Zen_US
dc.date.created2012-12en_US
dc.date.issued2013-07-24en_US
dc.date.submittedDecember 2012en_US
dc.date.updated2013-07-24T19:35:43Zen_US
dc.description.abstractDark enclaves rich in amphibole and biotite are ubiquitous in granitoid rocks and generally thought to represent fragments of mafic magmas, cumulates or restites. However, magmatic assimilation of metamorphic or sedimentary country rock can also form dark enclaves. To develop criteria for identifying dark enclaves of non-magmatic origin, we investigated dark enclaves from a complete spectrum of light (carbonate- or feldspar-rich) to dark (amphibole-rich, biotite-rich, or composite) enclaves, reflecting progressive thermal and chemical equilibration with host tonalite from the Domenigoni Valley pluton in the Peninsular Ranges Batholith, California. Metasedimentary dark enclaves have a number of major and trace element characteristics that overlap those of literature-compiled igneous dark enclaves. Comparison to modeled igneous differentiation paths shows metasedimentary enclaves can have anomalous CaO and K2O contents for a given SiO2, but other major element systematics may not deviate noticeably from igneous differentiation trends. In addition, the fact that there are literature-compiled mafic enclaves trending towards high K2O and high CaO suggests that not all mafic enclaves are of igneous origin. While the majority of dark enclaves may not be metasedimentary, this work provides some criteria for identifying enclaves should a case of metasedimentary origin arise.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationLiao, Kelley. "Geochemical Diagnostics of Metasedimentary Dark Inclusions: a Case Study from the Peninsular Ranges Batholith, California." (2013) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/71667">https://hdl.handle.net/1911/71667</a>.en_US
dc.identifier.slug123456789/ETD-2012-12-270en_US
dc.identifier.urihttps://hdl.handle.net/1911/71667en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectDark enclavesen_US
dc.subjectMetasedimentaryen_US
dc.subjectProtolithen_US
dc.subjectWall rock assimilationen_US
dc.subjectMetamorphismen_US
dc.titleGeochemical Diagnostics of Metasedimentary Dark Inclusions: a Case Study from the Peninsular Ranges Batholith, Californiaen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentEarth Scienceen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
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