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New constraints on the age and evolution of the Wishbone Ridge, southwest Pacific Cretaceous microplates, and Zealandia-West Antarctica breakup

Mortimer, N; Hoernle, K; Hauff, F; Palin, J; Dunlap, William James; Werner, Roberto; Faure, K


We present analytical results from four dredge locations across the eastern Zealandia continental margin and adjacent ocean crust. The 115 Ma dacites dredged from the West Wishbone Ridge (WWR) are isotopically primitive, weakly adakitic, slabderived lavas. The 97 Ma A-type granites and a basalt from the easternmost Chatham Rise enlarge the known area of postsubduction Gondwana magmatism. Amphibolite-grade schists from a fault block south of the Chatham Rise provide a critical bridge between the...[Show more]

CollectionsANU Research Publications
Date published: 2006
Type: Journal article
Source: Geology
DOI: 10.1130/G22168.1


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