Location and migration of Miocene–Quaternary volcanic arcs in the SW Pacific region

Mortimer, Nick; Gans, Phillip B.; Palin, J. Michael; Meffre, Sébastien; Herzer, R. H.; Skinner, D. N. B.

doi:10.1016/j.jvolgeores.2009.02.017

Cited by 85 publications

(80 citation statements)

References 37 publications

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“…In this model, Late Devonian magmatic rocks that yield N-MORB to arc-type geochemical signatures and host VMS-style deposits are indicative of a rifted arc setting, with the Taupo-Tonga-Kermadec arc system of the southwest Pacifi c Ocean as a modern analogue (e.g., Mortimer et al, 2010). N-MORB to backarc basin-type basalts and chert of the lower Station Creek Formation suggest that Late Devonian-early Mississippian extension led to the opening of a Sea of Japan-like ocean basin between the Wrangellia arc and Craig subterrane passive margin.…”

Section: Wrangellia (Wr Inmentioning

confidence: 99%

Late Paleozoic assembly of the Alexander-Wrangellia-Peninsular composite terrane, Canadian and Alaskan Cordillera

Beranek

Staal

McClelland

et al. 2014

Geological Society of America Bulletin

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Late Paleozoic assembly of the AlexanderWrangellia-Peninsular composite terrane is recorded by two phases of regional deformation, metamorphism, and magmatism within basement complexes of the Alexander (Craig and Admiralty subterranes), Wrangellia, and Peninsular terranes in the Canadian and Alaskan Cordillera. New secondary ion mass spectrometry (SIMS) and chemical abrasionisotope dilution-thermal ionization mass spectrometry (CA-ID-TIMS) zircon U-Pb ages, whole-rock major-and trace-element and Nd-Sr isotope geochemical compositions, and geological fi eld observations of late Paleozoic igneous rocks were used to identify the precise timing and signifi cance of this tectonism in the Saint Elias Mountains region of southwestern Yukon and eastern Alaska. Middle to Late Pennsylvanian (301-307 Ma) igneous rocks, herein assigned to the Barnard Glacier suite, were preferentially emplaced along the Wrangellia-Craig subterrane boundary and mainly comprise syenitic plutons that intrude Paleozoic country rocks with evidence of Pennsylvanian or older (D1) deformation. We propose that Barnard Glacier suite magmatism was produced by a slab breakoff event after the consumption of a narrow backarc ocean basin and early Pennsylvanian collision between the WrangelliaPeninsular arc and Craig subterrane passive margin. Early Permian (284-291 Ma) dioritic to granodioritic rocks, herein assigned to the Donjek Glacier suite, comprise the vestiges of an extensive magmatic system within the Craig subterrane of southwestern Yukon and southeastern Alaska. The available data suggest that the Donjek Glacier suite represents part of a short-lived, Early Permian arc that initiated along the outboard margin of the Craig subterrane-Wrangellia-Peninsular block after Pennsylvanian collision and slab breakoff. At two fi eld localities in southwestern Yukon, Paleozoic country rocks with D1 fabrics are also intruded by sills and dikes of the Donjek Glacier suite that show evidence of ca. 285 Ma regional deformation and metamorphism (D2). Field evidence for Early Permian tectonism in the Saint Elias Mountains implies direct connections with coeval deformation and metamorphism in the Admiralty subterrane, a microcontinent in the Admiralty Island region of southeastern Alaska that developed separately from the Craig subterrane prior to the Early Per mian. D2 tectonism was likely related to the entry of the Admiralty subterrane margin into the Early Permian subduction zone, which resulted in collision and fi nal amalgamation of the Alexander-Wrangellia-Peninsular composite terrane. Our tectonic scenarios require the currently accepted confi guration of the Alexander terrane (com posite of the Craig and Admiralty subterranes) to have only existed after the Early Permian collision between the Admiralty subterrane and the previously assembled Craig subterrane-Wrangellia-Peninsular terrane. Biogeographic and other geological data suggest that the two-part assembly of the AlexanderWrangellia-Peninsular composite terrane took place along a convergent margin t...

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Section: Wrangellia (Wr Inmentioning

confidence: 99%

Late Paleozoic assembly of the Alexander-Wrangellia-Peninsular composite terrane, Canadian and Alaskan Cordillera

Beranek

Staal

McClelland

et al. 2014

Geological Society of America Bulletin

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“…This is also supported by the similar Nd and Pb isotope ratios of about 0.51304 and 18.69 in tonalites compared to 0.51303-0.51307 and 18.61-18.71 in the lavas (Barker et al, 2013;Turner et al, 1997). Zircons from one Raoul Island tonalite sample were dated and yield an age of 1.25 Ma (Mortimer et al, 2010) which is similar to the age of the submarine Boat Cove Formation (1.4 to 0.6 Ma) indicating that at least some tonalites are coeval to the earliest stages of volcanic activity in the area. Previous work on felsic rocks from Raoul Island concluded that the SiO 2 -rich melts were formed either by fractional crystallization (Barker et al, 2013;Haase et al, 2011;Smith et al, 2010) or by partial melting of older island arc crust (Smith et al, 2006).…”

Section: The Formation Of Tonalites In the Raoul Island Magmatic Systemmentioning

confidence: 56%

“…Mineralogical and geochemical compositions indicate that the plutonic xenoliths are parts of the magmatic system of the young Raoul Island volcanoes rather than representing older island crust (Brothers and Searle, 1970;Turner et al, 1997). This is supported by the U-Pb age of 1.25 Ma obtained for zircon in one tonalitic xenolith (Mortimer et al, 2010). Xenoliths are abundant in lavas from Raoul Island (Brothers and Searle, 1970) and the specimen in this study were collected from the 1.4 to 0.6 Ma-old submarine Boat Cove Formation (Smith et al, 2010) in the SE part of the island (Fig.…”

Section: Geological Settingmentioning

confidence: 79%

“…7), which are more likely magmatic temperatures for these rocks. Mortimer et al (2010) calculated the whole-rock Zr-saturation temperature and the Ti-in-zircon temperature for the 1.25 Ma tonalite found in Matatirohia Tephra and obtained temperatures of 748°C and 715°C ± 30°C, respectively. These temperatures are consistent with the temperature of unaltered amphibole cores from another tonalite xenolith from the same area which yielded temperatures of 760-795°C and pressures of 0.65-0.90 kbar (Barker et al, 2013).…”

Section: Barometry and Thermometry On The Xenolithsmentioning

confidence: 99%

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The magmatic evolution of young island arc crust observed in gabbroic to tonalitic xenoliths from Raoul Island, Kermadec Island Arc

Haase

Lima

Krumm

et al. 2014

Lithos

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“…For symbols, refer to caption to Figure 3. arc volcanism (e.g. Mortimer et al 2010). Remagnetisation in the Waipapa Terrane may be due to fluid migration associated with those events.…”

Section: Remagnetisation Eventmentioning

confidence: 99%

Post-remagnetisation vertical axis rotation and tilting of the Murihiku Terrane (North Island, New Zealand)

Lagemaat

Boschman

Kamp

et al. 2017

New Zealand Journal of Geology and Geophysics

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We collected palaeomagnetic sample sets from Murihiku Terrane, North Island to constrain its palaeolatitude during the Late Triassic-Jurassic. The majority of the sample host rocks were remagnetised. However, a few samples show a magnetic signal that possibly recorded a primary remanent magnetisation. These samples preliminarily indicate that Murihiku Terrane was located at c. 63°S during the Early Jurassic. The remagnetised samples reveal significant post-remagnetisation tectonic rotation and tilting of the host rocks. We estimated an 83 ± 5 Ma timing of remagnetisation by plotting the palaeolatitude data on the apparent polar wander path of northern Zealandia. Samples from southernmost sites have lower inclination, which we interpret as reflecting eastward post-remagnetisation tilt of this region by 20°. In addition, declination data indicate large-scale post-remagnetisation rotation of Port Waikato and Awakino Gorge areas. This study contributes to the ongoing debate on the age and tectonic origin of oroclines in New Zealand basement. ARTICLE HISTORY

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Location and migration of Miocene–Quaternary volcanic arcs in the SW Pacific region

Cited by 85 publications

References 37 publications

Late Paleozoic assembly of the Alexander-Wrangellia-Peninsular composite terrane, Canadian and Alaskan Cordillera

Late Paleozoic assembly of the Alexander-Wrangellia-Peninsular composite terrane, Canadian and Alaskan Cordillera

The magmatic evolution of young island arc crust observed in gabbroic to tonalitic xenoliths from Raoul Island, Kermadec Island Arc

Post-remagnetisation vertical axis rotation and tilting of the Murihiku Terrane (North Island, New Zealand)

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