Showing papers in "Lithos in 1985"

TL;DR: In this paper, an explanation of these relationships by fracturing an incompletely crystallized host, rather than by entirely post magmatic fracturing with subsequent diking, is postulated to be consistent with experimental date and certain petrologic observations.

TL;DR: The petrology and geochemistry of komatiites at four localities in the Abitibi Greenstone Belt are presented in this article, where the effects of alteration, crystal fractionation and partial melting on their geochemistry are considered.

TL;DR: The Lanzo ultramafics of the Western Alps have shown a history of decompression at relatively high temperature (1150-950°C) from the spinel-lherzolite field to the plagioclase lherzolate field as discussed by the authors, which led to the opening of the small Piedmont-Ligurian basin.

TL;DR: The nature and origin of silicified serpentinite in the Semail nappe of Oman is described and discussed in this article, where the formation was caused by fracturing of the basal serpentinite by late tectonic events followed by dissolution of serpentine and precipitation of silica under slightly acidic, high-pCO 2 groundwater conditions.

TL;DR: In this paper, Ramaman microprobe spectrometers were applied to analysis of the gaseous phase in individual fluid inclusions in minerals from alkalic igneous rock types and associated hydrothermal veins from the Gardar province, south Greenland.

TL;DR: In this article, chemical and isotopic data from three major plutons of the Blue Tier Batholith support a model in which each granite type is formed from separate melts derived from partial melting of a range of protoliths and disproves an in situ crystal fractionation model which links all granitoid types.

TL;DR: In this article, the metamorphic grade in west Uusimaa, SW Finland, increases from low- to intermediate-amphibolite facies in the west (Island of Kemio) up to granulite faces in the middle and eastern parts.

TL;DR: In this article, the geometrical relations between secondary F.I. trails and regional stress fields are used to establish the chronology of both during a region's geological evolution.

TL;DR: In this paper, it was concluded that the growth of garnet at the interface with micas ceased when the {110} surface of the garnet came into contact with the basal plane of the micas in the tectonic c-axis direction.

TL;DR: The Shionomisaki igniferous complex as discussed by the authors was formed autochthonously in the sedimentary basin which was the forearc basin during the Miocene, and the existence of such an igneous complex suggests a forearc origin for the igneous members of some ophiolite complexes, and provides evidence against the view that all ophiliite complexes containing igneous rocks of abyssal affinities must have formed in mid-oceanic ridges.

TL;DR: In this article, two plutonic intrusions were selected according to the geotectonic site of their emplacement, namely the Tah intrusion and the Kharsareh intrusion.

TL;DR: In this paper, it was concluded that the gabbroic Oslo rift rocks are produced through a two-stage crystallization history combined with crustal contamination, and the final stage of evolution the magmas were to different degrees contaminated by Precambrian amphibolite facies and Cambro-Silurian carbonaceous country rock.

TL;DR: Chilled pillow margins, dike margins and interpillow hyaloclastites from the extrusive sequences of the Troodos ophiolite, Cyprus, reveal two compositional groups of glasses as mentioned in this paper.

TL;DR: In this paper, a water-deficient mylonite zone from the Pyrenees is characterized by incomplete breakdown of sillimanite + orthoclase in the stability field of muscovite + quartz, pure-CO 2 fluid inclusions, limited postkinematic grain growth and high differential stresses during deformation as indicated by recrystallized quartz grain size.

TL;DR: Garnet-bearing pyriclasites have been found within the Monts du Lyonnais formation near St. Andrela-Cote, in the eastern part of the Massif Central as mentioned in this paper.

TL;DR: Cordierite-hypersthene as discussed by the authors has been found in the high-grade West Uusimaa Complex, SW Finland with metamorphic conditions at respectively 550-650°C, 3-5 kbar, low H 2 O activity and 710-810°C.

TL;DR: In this paper, four main thrust units have been differentiated in the Kalak Nappe Complex of northeastern Porsangerhalvoya. All exhibit Barrovian type prograde metamorphism.

TL;DR: In this article, a single phase calcic amphibole with the intermediate composition between actinolite and hornblende was confirmed by analytical electron microscope and X-ray diffraction studies.

TL;DR: Basaltic stalacties suspended from the ceiling of a large lava tube at Kilauea, Hawaii, have totally enclosed vesicles whose walls are covered with euhedral FeTi oxide and silicate crystals as mentioned in this paper.

TL;DR: In this paper, the Artfjallet gabbro is judged to be close to their original magmatic compositions, which can be used to estimate the crystallization conditions. But the results are limited by the country-rock metamorphism and the presence of plagioclase.

TL;DR: The Loma Pelada pluton is a zoned low-calcium moderately peraluminous muscovite granite with accessory epidote, sphene and spessartite-almandine garnet.