The British-Irish Palaeocene Igneous Province (BPIP) is an ideal testing ground for the influence... more The British-Irish Palaeocene Igneous Province (BPIP) is an ideal testing ground for the influence of crustal composition on ascending magmas as four major tectono-stratigraphic terranes are traversed on a transect from Skye and Rum in the North, to the Mourne Mtns, Carlingford and Slieve Gullion in the South. These crustal blocks are bounded by major crustal discontinuities, the Moine Thrust,
Geochimica Et Cosmochimica Acta Supplement, Jul 1, 2008
... G. MACPHERSON 1, JON P. DAVIDSON 1, RICHARD C. PRICE 2, JOHN A. GAMBLE 3 AND IAN E. SMITH 4 1... more ... G. MACPHERSON 1, JON P. DAVIDSON 1, RICHARD C. PRICE 2, JOHN A. GAMBLE 3 AND IAN E. SMITH 4 1Department of Earth Sciences, University of Durham, UK (colin.macpherson@ durham.ac.uk) 2School of Earth Sciences, University of Waikato, New Zealand ...
ABSTRACT For active or dormant andesite volcanoes, detailed, stratigraphically controlled, geoche... more ABSTRACT For active or dormant andesite volcanoes, detailed, stratigraphically controlled, geochemical and petrological information enables an understanding of the magma supply and plumbing system feeding eruptions at the surface. This can establish a basis for predictive eruption models and thus for hazard prediction and management. The potential for petrography to inform volcanic hazard management is demonstrated by comparing two andesitic volcanoes located at the southern end of the Taupo Volcanic Zone in New Zealand's North Island. Ngauruhoe has been constructed over the past 3-5 ka and last erupted in 1975. Nearby Ruapehu has a much longer eruptive history extending back beyond 230 ka B.P. Despite their close spatial proximity, the two volcanoes show geochemical contrasts suggesting that each magmatic system has operated separately. The petrology and geochemistry (major and trace element chemistry, U-series isotopes, Sr and Nd isotopes) of eruptives from each volcano reflect magma evolution in a complex magma storage and plumbing system with magma chemistry strongly influenced by fractional crystallisation and crustal assimilation but in the case of Ngauruhoe there is evidence for cyclicity in the evolution of magma batches and this appears to be driven by periodic replenishment of the magmatic system from the mantle. In contrast, the past 2 ka of eruptive history at Ruapehu reflects random tapping of shallow, volume magma reservoirs.
Http Dx Doi Org 10 1080 00288306 1993 9514588, Mar 23, 2010
Abstract To the north of New Zealand, the oceanic Tonga‐Kermadec island arc system strikes roughl... more Abstract To the north of New Zealand, the oceanic Tonga‐Kermadec island arc system strikes roughly NNE‐SSW and intersects the continental shelf of New Zealand in the vicinity of the Whakatane arc volcano, a submarine edifice which rises around 1000 m from the surrounding seafloor. A major bathymetric slope‐break here coincides with the proposed oceanic‐continental transition zone. Northwest of the Whakatane volcano, dredging on Colville Knolls recovered samples of deformed Mesozoic (?) metasedimentary rocks, ...
New Zealand Journal of Geology and Geophysics, 1994
... caused arising directly or indirectly in connection with or arising out of the use of this ..... more ... caused arising directly or indirectly in connection with or arising out of the use of this ... and most of the dikes are charged with secondary carbonate, zeolite, and clay minerals ... the dikes, the mobility of K during alteration processes must be considered when evaluating the reliability ...
Journal of Volcanology and Geothermal Research, 2006
New multibeam mapping and whole-rock geochemistry establish the first order definition of the mod... more New multibeam mapping and whole-rock geochemistry establish the first order definition of the modern submarine Kermadec arc between 30° and 35° S. Twenty-two volcanoes with basal diameters >5 km are newly discovered or fully-mapped for the first time; Giggenbach, Macauley, Havre, Haungaroa, Kuiwai, Ngatoroirangi, Sonne, Kibblewhite and Yokosuka. For each large volcano, edifice morphology and structure, surficial deposits, lava fields,
The active southern Havre Trough (35020 '- 37øS) backarc basin is interpreted to for... more The active southern Havre Trough (35020 '- 37øS) backarc basin is interpreted to form from the evolution and interaction of migrating cross-arc magmatism, and the progressive development of longitudinal rift grabens. The proposed migration of the proto-Kermadec arc front from the Colville arc at- 5 Ma to the active Kermadec arc margin is recorded by the construction of arc edifices
The geochemical character of the mantle wedge in convergent margin settings is investigated using... more The geochemical character of the mantle wedge in convergent margin settings is investigated using the high field strength and transition elements Ti, Zr, V, Sc and Y in basaltic rocks from island arcs and associated back-arc basins. Systematic differences are observed in the ...
The British-Irish Palaeocene Igneous Province (BPIP) is an ideal testing ground for the influence... more The British-Irish Palaeocene Igneous Province (BPIP) is an ideal testing ground for the influence of crustal composition on ascending magmas as four major tectono-stratigraphic terranes are traversed on a transect from Skye and Rum in the North, to the Mourne Mtns, Carlingford and Slieve Gullion in the South. These crustal blocks are bounded by major crustal discontinuities, the Moine Thrust,
Geochimica Et Cosmochimica Acta Supplement, Jul 1, 2008
... G. MACPHERSON 1, JON P. DAVIDSON 1, RICHARD C. PRICE 2, JOHN A. GAMBLE 3 AND IAN E. SMITH 4 1... more ... G. MACPHERSON 1, JON P. DAVIDSON 1, RICHARD C. PRICE 2, JOHN A. GAMBLE 3 AND IAN E. SMITH 4 1Department of Earth Sciences, University of Durham, UK (colin.macpherson@ durham.ac.uk) 2School of Earth Sciences, University of Waikato, New Zealand ...
ABSTRACT For active or dormant andesite volcanoes, detailed, stratigraphically controlled, geoche... more ABSTRACT For active or dormant andesite volcanoes, detailed, stratigraphically controlled, geochemical and petrological information enables an understanding of the magma supply and plumbing system feeding eruptions at the surface. This can establish a basis for predictive eruption models and thus for hazard prediction and management. The potential for petrography to inform volcanic hazard management is demonstrated by comparing two andesitic volcanoes located at the southern end of the Taupo Volcanic Zone in New Zealand's North Island. Ngauruhoe has been constructed over the past 3-5 ka and last erupted in 1975. Nearby Ruapehu has a much longer eruptive history extending back beyond 230 ka B.P. Despite their close spatial proximity, the two volcanoes show geochemical contrasts suggesting that each magmatic system has operated separately. The petrology and geochemistry (major and trace element chemistry, U-series isotopes, Sr and Nd isotopes) of eruptives from each volcano reflect magma evolution in a complex magma storage and plumbing system with magma chemistry strongly influenced by fractional crystallisation and crustal assimilation but in the case of Ngauruhoe there is evidence for cyclicity in the evolution of magma batches and this appears to be driven by periodic replenishment of the magmatic system from the mantle. In contrast, the past 2 ka of eruptive history at Ruapehu reflects random tapping of shallow, volume magma reservoirs.
Http Dx Doi Org 10 1080 00288306 1993 9514588, Mar 23, 2010
Abstract To the north of New Zealand, the oceanic Tonga‐Kermadec island arc system strikes roughl... more Abstract To the north of New Zealand, the oceanic Tonga‐Kermadec island arc system strikes roughly NNE‐SSW and intersects the continental shelf of New Zealand in the vicinity of the Whakatane arc volcano, a submarine edifice which rises around 1000 m from the surrounding seafloor. A major bathymetric slope‐break here coincides with the proposed oceanic‐continental transition zone. Northwest of the Whakatane volcano, dredging on Colville Knolls recovered samples of deformed Mesozoic (?) metasedimentary rocks, ...
New Zealand Journal of Geology and Geophysics, 1994
... caused arising directly or indirectly in connection with or arising out of the use of this ..... more ... caused arising directly or indirectly in connection with or arising out of the use of this ... and most of the dikes are charged with secondary carbonate, zeolite, and clay minerals ... the dikes, the mobility of K during alteration processes must be considered when evaluating the reliability ...
Journal of Volcanology and Geothermal Research, 2006
New multibeam mapping and whole-rock geochemistry establish the first order definition of the mod... more New multibeam mapping and whole-rock geochemistry establish the first order definition of the modern submarine Kermadec arc between 30° and 35° S. Twenty-two volcanoes with basal diameters >5 km are newly discovered or fully-mapped for the first time; Giggenbach, Macauley, Havre, Haungaroa, Kuiwai, Ngatoroirangi, Sonne, Kibblewhite and Yokosuka. For each large volcano, edifice morphology and structure, surficial deposits, lava fields,
The active southern Havre Trough (35020 '- 37øS) backarc basin is interpreted to for... more The active southern Havre Trough (35020 '- 37øS) backarc basin is interpreted to form from the evolution and interaction of migrating cross-arc magmatism, and the progressive development of longitudinal rift grabens. The proposed migration of the proto-Kermadec arc front from the Colville arc at- 5 Ma to the active Kermadec arc margin is recorded by the construction of arc edifices
The geochemical character of the mantle wedge in convergent margin settings is investigated using... more The geochemical character of the mantle wedge in convergent margin settings is investigated using the high field strength and transition elements Ti, Zr, V, Sc and Y in basaltic rocks from island arcs and associated back-arc basins. Systematic differences are observed in the ...
Uploads
Papers by John Gamble