Petrogenesis of late stage magmatism at Hold with Hope, East Greenland
Article Abstract:
The geochemical data of basalt sequence found in Hold with Hope, East Greenland, were analyzed to shed light on the interaction between mantle-derived magmas and the continental lithosphere. The Sr and Nd isotope ratios of the rocks in the Myggbukta caldera complex showed coherent variations. Broad correlations with major element differentiation indices suggest that the continental component was incorporated during magmatic differentiation favoring a crustal contamination process. The dominant cause of trace element enrichment was fractional crystallization.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1998
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Spatial variations of Sr and Nd isotope ratios of Cretaceous-Paleogene granitoid rocks, Southwest Japan arc
Article Abstract:
The spatial variations of Sr and Nd isotopes of Cretaceous-Paleogene granitoid rocks are analyzed. Results show that granitoid magmas are derived from isotopically distinct lower crust-upper mantle sources in both North and South Zones. Moreover, granitoid rocks of the North Zone have low initial Sr isotope ratios, whereas granitoid rocks from the South Zone have high initial Sr isotope ratios. Lastly, the geographical variation in Sr and Nd isotopes is due to compositionally different magma sources beneath the North and South Zones.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1992
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Petrogenesis and significance of late Caledonian granitoid magmatism in western Norway
Article Abstract:
The granitoid rocks found in the late Ordovician Solund-Stavfjord Ophiolite Complex, west Norwegian Caledonides, contain isotopic elements coming from mantle-derived and continental sources. The rocks, which are metaluminous to peraluminous, exhibit decoupled Rb-Sr and Sm-Nd isotope systems and low levels of 87Sr/86Sr ratios. Furthermore, the introduction of mantle-derived magmas into the crust during obduction of the ophiolite complex has led to the development of sedimentary rocks of mixed mafic/continental compositions.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1992
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- Abstracts: Evidence for contemporaneous yet contrasting styles of granite magmatism during extensional collapse of the northeast Greenland Caledonides
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