Isotopic systematics of ultramafic and mafic rocks of the Taitao ophiolite, southern Chile
| dc.contributor.advisor | Walker, Richard J | en_US |
| dc.contributor.author | Schulte, Ruth Frost | en_US |
| dc.contributor.department | Geology | en_US |
| dc.contributor.publisher | Digital Repository at the University of Maryland | en_US |
| dc.contributor.publisher | University of Maryland (College Park, Md.) | en_US |
| dc.date.accessioned | 2007-06-22T05:31:57Z | |
| dc.date.available | 2007-06-22T05:31:57Z | |
| dc.date.issued | 2007-03-14 | |
| dc.description.abstract | A variety of ultramafic and mafic rocks from a well-mapped sampling of the ~6 Ma Taitao Ophiolite, Chile, have been examined. Calculated initial 187Os/188Os ratios of the peridotitic rocks range from 0.1168 to 0.1282. Similar ranges of Os isotopic compositions have been reported for abyssal peridotites, peridotites, and chromites from other ophiolites. A correlation between Mg # of primary olivine and Os isotopic compositions of whole rock peridotites suggests that the isotopic variability is due to variable extents of partial melting at ~1.5 Ga. This conclusion is also supported by a linear correlation between 187Re/188Os and 187Os/188Os. The ancient melting event requires that this km-scale block of the mantle remained isolated and unmixed within the convecting upper mantle for a period of ~1.5 Ga. The results are comparable to global observations of Os isotopic compositions in mid-ocean ridge basalts versus abyssal peridotites, but the geologic relations here are well-defined. | en_US |
| dc.format.extent | 2714389 bytes | |
| dc.format.mimetype | application/pdf | |
| dc.identifier.uri | http://hdl.handle.net/1903/6705 | |
| dc.language.iso | en_US | |
| dc.subject.pqcontrolled | Geochemistry | en_US |
| dc.subject.pqcontrolled | Geochemistry | en_US |
| dc.subject.pquncontrolled | isotope geochemisty | en_US |
| dc.subject.pquncontrolled | osmium | en_US |
| dc.subject.pquncontrolled | ophiolites | en_US |
| dc.subject.pquncontrolled | convecting upper mantle | en_US |
| dc.subject.pquncontrolled | chromites | en_US |
| dc.title | Isotopic systematics of ultramafic and mafic rocks of the Taitao ophiolite, southern Chile | en_US |
| dc.type | Thesis | en_US |
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