Results 191 to 200 of about 6,856 (206)
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Contributions to Mineralogy and Petrology, 1992
Mica pyroxenite xenoliths, occurring as the cores of nephelinite and ijolite bombs in the pyroclastic deposits of the active volcano Oldoinyo Lengai, have undergone metasomatism in which K was lost and Fe2+ and Ti gained. This is unlike the alkali and ferric iron addition that typifies most examples of metastomatism adjacent to peralkaline igneous ...
J. B. Dawson, J. V. Smith
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Mica pyroxenite xenoliths, occurring as the cores of nephelinite and ijolite bombs in the pyroclastic deposits of the active volcano Oldoinyo Lengai, have undergone metasomatism in which K was lost and Fe2+ and Ti gained. This is unlike the alkali and ferric iron addition that typifies most examples of metastomatism adjacent to peralkaline igneous ...
J. B. Dawson, J. V. Smith
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Chemical Geology, 2014
Abstract In the subduction-related Catalina Schist, reaction zones or ‘rinds’ developed at contacts of metamorphosed mafic blocks with chemically distinct melange matrix. These rinds exhibit complex chemical compositions that defy simple, single-process explanations.
Sarah C. Penniston-Dorland +4 more
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Abstract In the subduction-related Catalina Schist, reaction zones or ‘rinds’ developed at contacts of metamorphosed mafic blocks with chemically distinct melange matrix. These rinds exhibit complex chemical compositions that defy simple, single-process explanations.
Sarah C. Penniston-Dorland +4 more
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Proceedings of the Yorkshire Geological Society, 1992
SUMMARY K-Ar isotopic ages of illite-bearing iron carbonates associated with metasomatism of the Great Limestone are argued to relate to mineralisation which occurred between 252±5 and 240±6Ma. There is evidence that the ages of some of the illites investigated may have been partially reset by later hydrothermal events occurring between 240Ma
J. M. Davison +2 more
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SUMMARY K-Ar isotopic ages of illite-bearing iron carbonates associated with metasomatism of the Great Limestone are argued to relate to mineralisation which occurred between 252±5 and 240±6Ma. There is evidence that the ages of some of the illites investigated may have been partially reset by later hydrothermal events occurring between 240Ma
J. M. Davison +2 more
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Geochemistry International, 2012
The paper addresses the composition and genesis of endogenous borates from hypabyssal skarn deposits of Japan (Honshu Island) that were formed after dolomitic, rhodochrosite, and calcareous marbles in the contact aureoles of magmatic intrusions of diverse felsicity (from granites to diorite-monzonites).
S. M. Aleksandrov, M. A. Troneva
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The paper addresses the composition and genesis of endogenous borates from hypabyssal skarn deposits of Japan (Honshu Island) that were formed after dolomitic, rhodochrosite, and calcareous marbles in the contact aureoles of magmatic intrusions of diverse felsicity (from granites to diorite-monzonites).
S. M. Aleksandrov, M. A. Troneva
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2012
Heat-liberating events, such as igneous intrusions emplaced into cool crustal rocks, will result not only in loss of heat to the surrounding environment, but also in the transport of volatile components, which are responsible for metasomatic processes.
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Heat-liberating events, such as igneous intrusions emplaced into cool crustal rocks, will result not only in loss of heat to the surrounding environment, but also in the transport of volatile components, which are responsible for metasomatic processes.
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1987
Two types of hydrothermal alteration can be recognized in a biotite granite of Variscan age in Northern Switzerland. The first is related to the intrusion of the granite and lead to the replacement of K-spar and biotite by muscovite, of plagioclase by sericite and calcite and to a chloritization of biotite. This process affected the granite as a whole.
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Two types of hydrothermal alteration can be recognized in a biotite granite of Variscan age in Northern Switzerland. The first is related to the intrusion of the granite and lead to the replacement of K-spar and biotite by muscovite, of plagioclase by sericite and calcite and to a chloritization of biotite. This process affected the granite as a whole.
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TRANSFORMATION OF ORGANIC MATTER DURING METASOMATIC ALTERATION
International Geology Review, 1989Ye. S. Larskaya +6 more
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METASOMATIC ALTERATION AND OXYGEN ISOTOPIC COMPOSITIONS OF IGNEOUS CAIs FROM CK3 CHONDRITES
Goldschmidt2023 abstracts, 2023Alexander Krot +5 more
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Micas in metasomatically altered granites of the acid series
International Geology Review, 1971L.F. Syritso +3 more
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ORE-BEARING METASOMATICALLY ALTERED LIMESTONES OF THE BLACK SHALE ASSOCIATION
International Geology Review, 1990A. G. Zhabin +5 more
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