Geochemistry of late Cretaceous granitoids from northeastern Washington: implication for genesis of two-mica Cordilleran granites
Journal Article
·
· Geology; (United States)
Mesozoic two-mica granites and I-type granodiorites from northeastern Washington have initial /sup 87/Sr//sup 86/Sr ratios around 0.7100, similar to many other Cordilleran granitoids. Metapelite and calcsilicate country rocks, equivalent to the Belt Supergroup, have measured /sup 87/Sr//sup 86/Sr ratios in the range of 0.91 to 0.98. Unlike many of their Cordilleran counterparts, the northeastern Washington two-mica granites are enriched in U, Rb, and other incompatible elements, and therefore cannot have been derived from depleted lower crust sedimentary sources. Both the two-mica granites and the I-type granodiorites have similar rare-earth-element and trace-element enrichment patterns. Trace-elements modeling shows that it is feasible to derive the two-mica granites by 60% partial melting of a granodiorite-like source. The close association of Cordilleran metamorphic core complexes and older I-type granodiorites with two-mica granites supports this model.
- Research Organization:
- Univ. of Arizona, Tucson (USA)
- OSTI ID:
- 7188802
- Journal Information:
- Geology; (United States), Journal Name: Geology; (United States) Vol. 16:5; ISSN GLGYB
- Country of Publication:
- United States
- Language:
- English
Similar Records
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Conference
·
Tue Dec 31 23:00:00 EST 1991
· Geological Society of America, Abstracts with Programs; (United States)
·
OSTI ID:6137463
Petrochemical and Mineralogical Constraints on the Source and Processes of Uranium Mineralisation in the Granitoids of Zing-Monkin Area, Adamawa Massif, NE Nigeria
Journal Article
·
Wed Dec 14 23:00:00 EST 2011
· Natural Resources Research (New York, N.Y.)
·
OSTI ID:22043832
Progressive mixing of isotopic reservoirs during magma genesis at the Sierrita porphyry copper deposit, Arizona: Inverse solutions
Journal Article
·
Thu Sep 01 00:00:00 EDT 1988
· Geochimica et Cosmochimica Acta; (USA)
·
OSTI ID:5180455
Related Subjects
58 GEOSCIENCES
580400* -- Geochemistry-- (-1989)
ACTINIDES
ALKALI METALS
ALKALINE EARTH ISOTOPES
BETA DECAY RADIOISOTOPES
CHEMISTRY
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTS
ENRICHMENT
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FEDERAL REGION X
GEOCHEMISTRY
GEOLOGIC HISTORY
GEOLOGIC MODELS
GRANITES
HOURS LIVING RADIOISOTOPES
IGNEOUS ROCKS
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPE RATIO
ISOTOPES
METALS
MICA
NORTH AMERICA
NUCLEI
PLUTONIC ROCKS
RADIOISOTOPES
RARE EARTHS
ROCKS
RUBIDIUM
STABLE ISOTOPES
STRONTIUM 86
STRONTIUM 87
STRONTIUM ISOTOPES
URANIUM
USA
WASHINGTON
580400* -- Geochemistry-- (-1989)
ACTINIDES
ALKALI METALS
ALKALINE EARTH ISOTOPES
BETA DECAY RADIOISOTOPES
CHEMISTRY
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTS
ENRICHMENT
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FEDERAL REGION X
GEOCHEMISTRY
GEOLOGIC HISTORY
GEOLOGIC MODELS
GRANITES
HOURS LIVING RADIOISOTOPES
IGNEOUS ROCKS
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPE RATIO
ISOTOPES
METALS
MICA
NORTH AMERICA
NUCLEI
PLUTONIC ROCKS
RADIOISOTOPES
RARE EARTHS
ROCKS
RUBIDIUM
STABLE ISOTOPES
STRONTIUM 86
STRONTIUM 87
STRONTIUM ISOTOPES
URANIUM
USA
WASHINGTON