Rhenium^Osmium Isotope and Platinum-Group Element Constraints on the Origin and Evolution of the 127 Ga Muskox Layered Intrusion
isotope systematics determined for the entire preserved stratigraphy of the 127 Ga Muskox intrusion provide an exceptional view of magma chamber processes and mineralization in the main plutonic system of the Mackenzie large igneous province (LIP).We present new Re^Os isotope data for the intrusion,...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Published: |
2007
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| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.570.7313 http://www.mantleplumes.org/WebDocuments/dayetal_jpet_2008.pdf |
| Summary: | isotope systematics determined for the entire preserved stratigraphy of the 127 Ga Muskox intrusion provide an exceptional view of magma chamber processes and mineralization in the main plutonic system of the Mackenzie large igneous province (LIP).We present new Re^Os isotope data for the intrusion, together with PGE and trace element abundances, and oxygen and Sm^Nd isotope data on samples that include local crustal materials, layered series perido-tites, stratiform chromitites, marginal and roof zone rocks, and the Muskox Keel feeder dyke. Intrusive rocks span wide ranges in initial isotopic compositions (gOsiþ10 to þ 876; eNdi04 to 66; d18OOlþ 55 to þ 69ø) and highly siderophile element abundances (HSE: PGE and Re; Re 002^105 ppb; Pt 023^ 115 ppb; Os 002 to4 200 ppb). HSE and fluid-immobile trace element abundance variations are consistent with relative compat-ibilities expected for cumulate rocks. The most radiogenic Os and |
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