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- W186781037 abstract "The granitic complex forming the Ansons Bay Batholith (300) km2)in northeastern Tasmania, is composed of a variety of granitoids whichintrude the low-grade regionally metamorphosed Ordivician to LowerDevonian Mathinna Beds.The granitoids are divided into five major types based on maficmineralogy, plagioclase composition and textural variation. Geochemicalevidence suggests that the granodiorite, microgranite and biotite-,garnet-biotite, and alkali feldspar granites have been derived byRayleigh fractional crystallization of a melt from a ~hemically inhomogeneoussource region. Major and trace element modelling of the biotite-,garnet-biotite, and alkali feldspar granites explains the linear trendobserved between these granites by 25% fractional crystallization of asolid composed of 64% plagioclase, 20% biotite, and 16% K-feldspar.Late Devonian dolerite dykes (up to 10 km long) associated withlate stage crystallization of the granites, may provide an upper age limitto the Tabberabberan Orogeny within the Ansons Bay Batholith.An agmatic migmatite, 2 km south of Eddystone Point, has aK-fe1dspar-cordierite hornfels facies mineral assemblage. P-T conditionsof 1 kb and 600°C are inferred for the migmatite formation. Granitecontamination and Mathinna Bed xenoliths are largely restricted to themigmatite contact.Mafic xenoliths from both the granodiorite and garnet-biotitegranites have cognate (cumulate) origins and are unrelated to thecountry rocks. The aplitic xenoliths from the garnet-biotite granites,however, are interpreted as dismembered alkali feldspar dykes.The mafic mineral assemblages from the garnet-biotite granitessuggest low pressure conditions (1 kb) of emplacement at temperatures0 close to 700 C. Garnet-biotite (cordierite) geothermometry and feldspargeothermometry confirm these temperatures." @default.
- W186781037 created "2016-06-24" @default.
- W186781037 creator A5085559657 @default.
- W186781037 date "1982-12-01" @default.
- W186781037 modified "2023-09-27" @default.
- W186781037 title "The geology and geochemistry of the Ansons Bay Batholith, N.E Tasmania" @default.
- W186781037 hasPublicationYear "1982" @default.
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