Results 71 to 80 of about 501 (102)
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A spessartite-rich alteration assemblage from the Bega Granite, N.S.W., Australia
Lithos, 1974Abstract Pipe deposits of quartz-bismuthinite-molybdenite in the roof zone of a granitic pluton metasomatised to a leucocratic soda syenite are surrounded by concentric spessartitic and sericitic alteration zones. Chemical and petrographic data on the alteration zones are presented. It is suggested that the alteration has formed from laterally moving
I. Plimer
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A Composite Spessartite–Appinite Intrusion From Port-Na-Blagh, County Donegal, Ireland
Geological Journal, 1989AbstractA sheet‐like appinite from Breaghy Head, North Donegal, is closely associated with a spessartite intrusion. Field, mineralogical, and geochemical similarities indicate that the parent magmas were very similar, and the appinite magma may have been derived from the spessartite by small degrees of crystal fractionation.
R. Elsdon, S. P. Todd
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Composition and origin of xenocrysts in the Eastern Shore spessartite dykes, Nova Scotia
, 2023 The Eastern Shore dykes are a swarm of mantle-derived spessartite (lamprophye) dykes in the Sheet Harbour area of eastern Nova Scotia. Two of the dykes, Pleasant Harbour-Borgles Island and Popes Harbour, contain abundant xenoliths and xenocrysts. Some of the xenoliths are granulite-facies metamorphic rocks that in previous studies were shown to contain
Gan, Yuzhe
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Elasticity of Some Mantle Crystal Structures 3. Spessartite-Almandine Garnet
Journal of Geophysical Research, 1974The single-crystal elastic constants and their pressure derivatives for a spessartite-almandine garnet ((Mn, Fe)3Al2Si3O12) have been determined at room temperature by the pulse echo overlap method. The elastic constants at P = 1 bar are C11 = 3.085 Mbar, C12 = 1.123 Mbar, and C44 = 0.948 Mbar, within 3% of previous measurements on Mn-Fe and Mg-Fe ...
Gene Simmons
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Exploration and Mining Geology, 2000
Wawa has long been a center of mineral exploration activity and diamonds have been reported in the area since the 1930s. However, diamond exploration did not begin in the area in earnest until 1991. In 1993, Sandor Surmacz and Marcelle Hauseux of Saminex began a prospecting program in the area which culminated in their discovery of the “Sandor” diamond
R. Thomas, C. Gleeson
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Wawa has long been a center of mineral exploration activity and diamonds have been reported in the area since the 1930s. However, diamond exploration did not begin in the area in earnest until 1991. In 1993, Sandor Surmacz and Marcelle Hauseux of Saminex began a prospecting program in the area which culminated in their discovery of the “Sandor” diamond
R. Thomas, C. Gleeson
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, 2015 Highlights: • Northwestern Iranian lamprophyres have alkaline and calc-alkaline nature. • Studied lamprophyres are emplaced during Late Cretaceous to Late Miocene time.
M. Aghazadeh +5 more
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