Recrystallization of oscillatory zoned zircon: some geochronological and petrological implications
Article Abstract:
The presence of large amounts of contaminants during magmatic crystallization results in the formation of oscillatory zoned zircons with interspersed patches of unzoned zircons. The unzoned zircon substitution of zoned zircon can serve as a basis for determining the recrystallization of oscillatory zoned zircon. The recrystallization of oscillatory zoned zircon, which starts after the primary crystallization from the magma is finished, involves the exchange and migration of contaminant elements from interacting rock formations into the zoned zircon. Moreover, the unzoned zircon possesses lower levels of U, Th and Pb than the primary zoned zircon.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1992
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Multiple zircon growth and recrystallization during polyphase last carboniferous to Triassic metamorphism in granulites of the Ivrea zone (Southern Alps): an ion microprobe (SHRIMP) study
Article Abstract:
Zircons from a granulite of the Ivrea zone differ in their response to granulite facies metamorphism with respect to crystal morphology and U/Pb ages. Detrital zircons in the metasediment developed an isometric overgrowth due to addition of Zr decomposing during anatectic melting. The overgrowth started in the late carboniferous age, earlier than in the adjacent psammitic layer. The delay in melting was caused by different positions of the solidus in the psammitic layer and was initiated by a thermal pulse and/or by a depression, supported by shell morphology of the Zircon overgrowth.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1996
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Internal structures of zircons from Archean granites from the Darling Range batholith: implications for zircon stability and the interpretation of zircon U-Pb ages
Article Abstract:
Advances in analysing techniques have made it possible to undertake U-Pb age determination in zircon fragments weighing under one microgram. A new study investigates the internal structures of zircon from the late Archean Darling Range Batholith, Australia, to determine their origins and their geological significance. The presence of secondary decomposition structures in zircons suggests that the initial closed system reconstitution of zircons is caused by slow cooling at high temperatures.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1998
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