Slow‐to‐Fast Deformation in Mafic Fault Rocks on an Active Low‐Angle Normal Fault, Woodlark Rift, SE Papua New Guinea

Autor: M. Mizera, T. Little, C. Boulton, D. Prior, E. Watson, J. Biemiller, J. White, Norio Shigematsu
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Geochemistry, Geophysics, Geosystems, Vol 21, Iss 11, Pp n/a-n/a (2020)
Druh dokumentu: article
ISSN: 1525-2027
DOI: 10.1029/2020GC009171
Popis: Abstract Slip on the active Mai'iu low‐angle normal fault in Papua New Guinea that dips 15–24° at the surface has exhumed in its footwall a single, continuous fault surface across a >25‐km‐wide dome. Derived from a metabasaltic protolith, the fault zone consists of a 275°C–370°C. In a foliated cataclasite unit at shallower crustal levels (T ≈ 150°C–275°C), metasomatic reactions accompanied fluid‐assisted mass transfer processes that accommodated aseismic, distributed shearing; pseudotachylites and ultracataclasites in the same unit indicate that such creep was punctuated by episodes of seismic slip—after which creep resumed. At the shallowest levels (T
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