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Nasivi shear zone

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Journal Article
Journal: Economic Geology
Published: 01 August 1993
Economic Geology (1993) 88 (5): 1053-1083.
... is evident along the Nasivi shear zone, caused by a northwesterly evolution and migration of intrusion and hydrothermal activity. Porphyry-style, subeconomic copper-gold mineralization and associated alteration occurred at depth in the Nasivi shear zone at the center of the caldera, approximately...
Journal Article
Journal: Economic Geology
Published: 01 September 2011
Economic Geology (2011) 106 (6): 975-998.
.... Fault rocks were mostly brittle cataclasites or breccias, but some clay-rich zones displayed ductile structures. Many veins overprinted faults, with a change from shear-mode to opening-mode deformation. Stockwork veins formed a mesh composed of two orthogonal sets: one with northeast-southwest...
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Series: Reviews in Economic Geology
Published: 01 January 2000
DOI: 10.5382/Rev.13.08
EISBN: 9781629490205
... and the Nasivi shear zone (Fig. 6 d; Anderson and Eaton, 1990 ). Most vein systems occupy vertical or steeply dipping structures (Cripple Creek, Porgera), but low-angle structures can also be mineralized, e.g., the “flatmakes” ( Anderson and Eaton, 1990 ). Some mineralization is also hosted by hydrothermal...
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Journal Article
Published: 01 February 1991
Journal of the Geological Society (1991) 148 (1): 115-127.
... is bounded to the northeast by the Nasivi Shear Zone, to the southeast by a northeast-striking, subvertical fault (Fig. S), and tohe south by an east-trending, north-dipping (approximately 70") fault (Fig. 8). The northwestern boundary is apparently a hinge rather than a fault. At approximately the same time...
Journal Article
Journal: Economic Geology
Published: 01 May 2003
Economic Geology (2003) 98 (3): 479-493.
... and the northwest-trending Nasivi shear zone. The basaltic lavas of the Tavua caldera were extruded between 5.2 and 4.6 Ma ( Setterfield et al., 1992 ; Begg, 1996 ; Begg and Gray, 2002 ). Low-grade porphyry-style copper mineralization is spatially associated with epithermal gold mineralization in and along steep...
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