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Pre-eruptive Magmatic Conditions at Augustine Volcano, Alaska, 2006: Evidence from Amphibole Geochemistry and Textures 21 Aug 2013 | 11:40 am
Variations in the geochemistry and texture of amphibole phenocrysts erupted from Augustine Volcano in 2006 provide new insights into pre- and syn-eruptive magma storage and mixing. Amphiboles are rare...
Identifying Relic Igneous Garnet and Clinopyroxene in Eclogite and Granulite, Breaksea Orthogneiss, New Zealand 21 Aug 2013 | 11:40 am
Eclogite and omphacite granulite occur interlayered on centimetre to decametre scales to form the Cretaceous Breaksea Orthogneiss, with assemblages reflecting peak conditions of P 1·8 GPa and T 850°C....
New Thermodynamic Models and Calculated Phase Equilibria in NCFMAS for Basic and Ultrabasic Compositions through the Transition Zone into the Uppermos... 21 Aug 2013 | 11:40 am
Phase equilibria calculated with thermocalc for simplified mantle ultrabasic and basic bulk compositions in Na2O–CaO–FeO–MgO–Al2O3–SiO2 (NCFMAS) at depths down to the Transition Zone and uppermost low...
The Residual or Roof Zone of the Bushveld Complex, South Africa 21 Aug 2013 | 11:40 am
The geological succession of an area in the southeastern Bushveld Complex, South Africa is described here, in which up to 700 m of monzonitic rocks, more evolved than in currently proposed stratigraph...
Very Low- to Low-grade Metamorphic Processes Related to the Collisional Assembly of Avalonia in SE Cape Breton Island (Nova Scotia, Canada) 21 Aug 2013 | 11:40 am
To better understand geodynamic processes related to the assembly of various belts of volcanic–sedimentary rocks in the Avalonian Mira terrane of SE Cape Breton Island (protolith ages 680–560 Ma) we i...
Metasomatism in the Ultrahigh-pressure Svartberget Garnet-peridotite (Western Gneiss Region, Norway): Implications for the Transport of Crust-derived ... 21 Aug 2013 | 11:40 am
Garnet-peridotites often contain veins or layers of pyroxenite and eclogite of uncertain origin. We investigate the Svartberget garnet-peridotite from the northernmost ultrahigh-pressure domain in the...
Experimental Equilibrium Tested by Plagioclase Loop Widths 21 Aug 2013 | 11:40 am
The plagioclase loop width is defined as AnS – AnL where S and L are solid and liquid, respectively, and An is the mole fraction (or per cent) An/(An + Ab). It is measured from the plagioclase composi...
Petrology and Geochemistry of the Crust-Mantle Boundary in a Nascent Arc, Massif du Sud Ophiolite, New Caledonia, SW Pacific 21 Aug 2013 | 11:40 am
The Massif du Sud ophiolite, New Caledonia, SW Pacific, is one of the largest exposed ultramafic bodies on Earth. The ophiolite consists of a mantle section of ultra-depleted tectonite harzburgite, ov...
New Constraints from Garnetite on the P-T Path of the Khondalite Belt: Implications for the Tectonic Evolution of the North China Craton 21 Aug 2013 | 11:40 am
Garnetite pods containing >60 mol % garnet in association with garnet-bearing quartz-rich lenses are sporadically distributed in the Khondalite Belt, North China Craton. The mineral assemblages and mi...
Heterogeneous Zircon Cargo in Voluminous Late Paleozoic Rhyolites: Hf, O Isotope and Zr/Hf Records of Plutonic to Volcanic Magma Evolution 13 Jul 2013 | 06:33 pm
Voluminous rhyolitic lavas and ignimbrites (c. 34 000 km3) were formed in the NE German Basin in a post-collisional setting at c. 295 Ma. Trace elements, Hf and 18O have been measured in dated magmati...
