87Sr/86Sr and 18O/16O isotopic systematics and geochemistry of granitoid plutons across a steeply-dipping boundary between contrasting lithospheric blocks in western Idaho
Article Abstract:
Granitoid plutons in contrasting lithospheric blocks in western Idaho were analyzed to determine the strontium and oxygen isotopic and elemental geochemistry of the area under study. Results indicate an abrupt geochemical boundary ranging from tonalite to granite in four plutonic complexes. This is the result of the boundary between accreted terranes from oceanic arcs and the continental margin. The change in crustal characteristics, documented in the elemental composition of the intrusions, is deep indicating a vertical boundary.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1992
User Contributions:
Comment about this article or add new information about this topic:
Behavior of isotopic systematics during deformation and metamorphism: a Hf, Nd and Sr isotopic study of mylonitized granite
Article Abstract:
Compositional analysis of deformed granite from a mylonite zone in Harquahala Mountains, AZ, was undertaken to determine the effects of metamorphism and deformation on the isotopic composition of rocks. Results indicate that the hafnium and neodymium isotopic systems were relatively immobile compared to the strontium isotopic system. This indicates that a analysis of the hafnium and neodymium isotopic composition of rocks will give a reliable model with which to infer age information.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1992
User Contributions:
Comment about this article or add new information about this topic:
Behavior of isotopic systematics during deformation and metamorphism: a Hf, Nd and Sr isotopic study of mylonitized granite
Article Abstract:
The errors in Rb concentrations were amended to reproduce Rb-Sr isotopic results. The changes do not affect the results that the Rb-Sr systematics of the mylonitized granites are disturbed compared to Sm-Nd and Lu-Hf systems. The new analyses considered duplicate results from Arizona and Wisconsin laboratories and calculations by total spiking.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1995
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Phase equilibria and oxygen isotopes in the evolution of metapelitic migmatites: a case study from the Pre-Alpine basement of Northern Switzerland
- Abstracts: Geometry of thin-skinned tectonic systems in relation to detachment layer thickness in sedimentary basins. Rifted margin formation in the south Tyrrhenian Sea: a high-resolution seismic profile across the north Sicily passive continental margin
- Abstracts: Survival patterns and mortality sources of herbivorous insects: some demographic trends. Relations among assemblage size, host specialization, and climatic variability in North American parasitoid communities
- Abstracts: The Mud Tank carbonatite complex, central Australia - an example of metasomatism at mid-crustal levels. A new Italian carbonatite occurrence at Cupaello (Rieti) and its genetic significance