Geochemical stratigraphy of the Huronian continental volcanics at Thessalon, Ontario: contributions of two-stage crustal fusion
Article Abstract:
The Huronian low-Ti continental volcanics at Thessalon, Ontario have been subjected to systematic stratigraphic geochemical and compositional variation analysis. The tholeiite basaltic and rhyolite systems are classified into mafic end-members (MEMs), basaltic to intermediate fractionates, felsic dacites, rhyolites with high light rare earth element (LREE) but low large-ion lithophile element (LILE) and rhyolites with depleted LREE but abundant LILE. Moreover, the MEMs show low SiO2 levels and high Ti/Zr ratios with an average of 85. The results indicate an extensive two-stage contamination of mafic crustal fusion and crystal fractionation.
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:
Late cretaceous rift-related upwelling and melting of the Trindade starting mantle plume head beneath western Brazil
Article Abstract:
The Late-Cretaceous impact zone of the Trindade mantle plume underneath western and central Brazil is studied. It is shown that intensified lithospheric extension above the western margin of the postulated impact zone allowed a larger upwelling and melting of Trindade plume. It is also shown that the ocean-island basalts came from convecting-mantle-source melts at depths of 80-100 km. and a temperature of 1500 degrees Centrigrade.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1997
User Contributions:
Comment about this article or add new information about this topic:
The limited extent of plume-lithosphere interactions during continental flood-basalt genesis: geochemical evidence from Cretaeous magmatism in Southern Brazil
Article Abstract:
Researchers discuss the magmatic episodes experienced by Southern Brazil during the early-Cretaceous period, focusing on each episodes' distinct melt genesis in the earth's mantle. Topics include evaluation of potassic and sodic magmas, melting of subcontinental lithospheric mantle, and melting differences during the early- and late-Cretaceous periods.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1999
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Some thermomechanical aspects of the subduction of continental lithosphere
- Abstracts: Petrological constraints and PT path of Devonian collapse tectonics within the Scandinavian mountain belt (Western Gneiss Region, Norway)
- Abstracts: Tectonic history of the eastern edge of the Alexander Terrane, southeast Alaska. GPS-determination of along-strike variation in Cascadia margin kinematics: implications for relative plate motion, subduction zone coupling, and permanent deformation
- Abstracts: Relationship between northwestern Tasmania and East Gondwanaland in the Late Cambrian/Early Ordovician: paleomagnetic evidence
- Abstracts: Continuous-time models of host-parasitoid interactions. Inferring host-parasitoid stability from patterns of parasitism among patches