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The Karamea Batholith in the Buller terrane of the South Island New Zealand forms part of an extensive Middle-Late Devonian belt of magmatic activity along, or close to, the Paleo-Pacific margin of Gondwana. The belt includes the I- and S-type granites of the Lachlan Fold Belt in SE Australia and coeval rocks in Antartica. The northern half of the Karamea Batholith comprises five main intrusive...
Relics suggesting an early high-pressure eclogite facies stage have been identified in the garnet and clinopyroxene-bearing amphibolites of the Tatra Mountains, in the Variscan basement of the Western Carpathians, Slovakia. In these rocks, primary omphacite (Cpx I) has been wholly converted to symplectites of diopside (Cpx II) and plagioclase. Apart from minor inclusions in the garnet cores, amphibole...
The Igaliko Nepheline-Syenite Complex of Gardar age (1300-1120 Ma) includes carbonatite, lamprophyre, basalt, trachybasalt, phonolite and rhyolite dykes. The relationship of carbonatite magma to the other magma types in this area is not immediately obvious. Field, geochemical and petrological studies suggest three equally acceptable models for the evolution of the carbonatites. Here we present...
Minor magmatic intrusions (dykes and explosion pipes) of lamprophyric and carbonatitic compositions occur on several islands in the Gulf of Kandalaksha (White Sea, Kola Peninsula, Russia). The lamprophyre dykes yielded K-Ar ages of 368 ± 15 Ma and 360 ± 16 Ma, similar to the majority of alkaline rocks from the Kola Alkaline Province. Mineralogical data (presence of perovskite and sodalite, absence...
High-pressure clinopyroxenes in metasomatic mafic rocks (rodingites and metagabbros containing titanoclinohumite) and eclogites from the Voltri Massif (Ligurian Western Alps) retain primary, two-phase aqueous inclusions (H 2 O + NaCl ± KCl). In the metasomatized rocks the inclusions align with the c axes and the cleavage planes of diopside. The eclogites display mylonitic textures: primary...
The formation of layers in mafic intrusions has been explained by various processes, making it the subject of much controversy. The concept that layering originates from gravitational settling of crystals has been superseded in recent years by models involving in situ fractional crystallization. Here we present evidence from the Centre Hill complex that both processes may be operative simultaneously...
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