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Journal articles on the topic 'Petrogenesis New Zealand'

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Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

Lindsay, Jan M., Tim J. Worthington, Ian E. M. Smith, and Philippa M. Black. "Geology, petrology, and petrogenesis of Little Barrier Island, Hauraki Gulf, New Zealand." New Zealand Journal of Geology and Geophysics 42, no. 2 (June 1999): 155–68. http://dx.doi.org/10.1080/00288306.1999.9514837.

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2

Serre, Simon H., Quinten H. A. van der Meer, Tod E. Waight, James M. Scott, Carsten Münker, Tonny B. Thomsen, and Petrus J. le Roux. "Petrogenesis of amphibole megacrysts in lamprophyric intraplate magmatism in southern New Zealand." New Zealand Journal of Geology and Geophysics 63, no. 4 (August 19, 2020): 489–509. http://dx.doi.org/10.1080/00288306.2020.1801771.

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3

Daczko, NR, S. Emami, AH Allibone, and IM Turnbull. "Petrogenesis and geochemical characterisation of ultramafic cumulate rocks from Hawes Head, Fiordland, New Zealand." New Zealand Journal of Geology and Geophysics 55, no. 4 (December 2012): 361–74. http://dx.doi.org/10.1080/00288306.2012.719910.

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4

Price, R. C., R. B. Stewart, J. D. Woodhead, and I. E. M. Smith. "Petrogenesis of High-K Arc Magmas: Evidence from Egmont Volcano, North Island, New Zealand." Journal of Petrology 40, no. 1 (January 1, 1999): 167–97. http://dx.doi.org/10.1093/petroj/40.1.167.

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5

Patterson, Des B., and Ian J. Graham. "Petrogenesis of andesitic lavas from Mangatepopo valley and Upper Tama lake, Tongariro volcanic centre, New Zealand." Journal of Volcanology and Geothermal Research 35, no. 1-2 (September 1988): 17–29. http://dx.doi.org/10.1016/0377-0273(88)90003-0.

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6

Prentice, Marlena L., Adrian Pittari, Shaun L. L. Barker, and Vicki G. Moon. "Volcanogenic processes and petrogenesis of the early Pleistocene andesitic-dacitic Maungatautari composite cone, Central Waikato, New Zealand." New Zealand Journal of Geology and Geophysics 63, no. 2 (August 29, 2019): 210–26. http://dx.doi.org/10.1080/00288306.2019.1656259.

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7

Graham, Ian J., Brian L. Gulson, Jeffrey W. Hedenquist, and Karen Mizon. "Petrogenesis of Late Cenozoic volcanic rocks from the Taupo Volcanic Zone, New Zealand, in the light of new lead isotope data." Geochimica et Cosmochimica Acta 56, no. 7 (July 1992): 2797–819. http://dx.doi.org/10.1016/0016-7037(92)90360-u.

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8

Hood, Steven D., Campbell S. Nelson, and Peter J. J. Kamp. "Petrogenesis of diachronous mixed siliciclastic‐carbonate megafacies in the cool‐water Oligocene Tikorangi formation, Taranaki Basin, New Zealand." New Zealand Journal of Geology and Geophysics 46, no. 3 (September 2003): 387–405. http://dx.doi.org/10.1080/00288306.2003.9515016.

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9

Cooper, Alan F. "Petrology and petrogenesis of an intraplate alkaline lamprophyre-phonolite-carbonatite association in the Alpine Dyke Swarm, New Zealand." New Zealand Journal of Geology and Geophysics 63, no. 4 (October 31, 2019): 469–88. http://dx.doi.org/10.1080/00288306.2019.1684324.

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10

Graham, Ian J., and Timothy Worthington. "Petrogenesis of Tauhara Dacite (Taupo Volcanic Zone, New Zealand) - Evidence for magma mixing between high-alumina andesite and rhyolite." Journal of Volcanology and Geothermal Research 35, no. 4 (December 1988): 279–94. http://dx.doi.org/10.1016/0377-0273(88)90024-8.

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11

Graham, I. J., and J. W. Cole. "Petrogenesis of andesites and dacites of White Island volcano, Bay of Plenty, New Zealand, in the light of new geochemical and isotopic data." New Zealand Journal of Geology and Geophysics 34, no. 3 (September 1991): 303–15. http://dx.doi.org/10.1080/00288306.1991.9514468.

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12

Waight, T. E., R. C. Price, R. B. Stewart, I. E. M. Smith, and J. Gamble. "Stratigraphy and geochemistry of the Turoa area, with implications for andesite petrogenesis at Mt Ruapehu, Taupo Volcanic Zone, New Zealand." New Zealand Journal of Geology and Geophysics 42, no. 4 (December 1999): 513–32. http://dx.doi.org/10.1080/00288306.1999.9514858.

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13

Price, R. C., J. A. Gamble, I. E. M. Smith, R. Maas, T. Waight, R. B. Stewart, and J. Woodhead. "The Anatomy of an Andesite Volcano: a Time–Stratigraphic Study of Andesite Petrogenesis and Crustal Evolution at Ruapehu Volcano, New Zealand." Journal of Petrology 53, no. 10 (August 18, 2012): 2139–89. http://dx.doi.org/10.1093/petrology/egs050.

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14

Spandler, Carl J., Richard J. Arculus, Stephen M. Eggins, John A. Mavrogenes, Richard C. Price, and Anthony J. Reay. "Petrogenesis of the Greenhills Complex, Southland, New Zealand: magmatic differentiation and cumulate formation at the roots of a Permian island-arc volcano." Contributions to Mineralogy and Petrology 144, no. 6 (March 2003): 703–21. http://dx.doi.org/10.1007/s00410-002-0424-z.

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15

McCoy-West, Alex J., Joel A. Baker, Kevin Faure, and Richard Wysoczanski. "Petrogenesis and Origins of Mid-Cretaceous Continental Intraplate Volcanism in Marlborough, New Zealand: Implications for the Long-lived HIMU Magmatic Mega-province of the SW Pacific." Journal of Petrology 51, no. 10 (August 28, 2010): 2003–45. http://dx.doi.org/10.1093/petrology/egq046.

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16

Price, Richard C., Ian E. M. Smith, Robert B. Stewart, John A. Gamble, Kerstin Gruender, and Roland Maas. "High-K andesite petrogenesis and crustal evolution: Evidence from mafic and ultramafic xenoliths, Egmont Volcano (Mt. Taranaki) and comparisons with Ruapehu Volcano, North Island, New Zealand." Geochimica et Cosmochimica Acta 185 (July 2016): 328–57. http://dx.doi.org/10.1016/j.gca.2015.12.009.

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17

van der Meer, Q. H. A., T. E. Waight, M. J. Whitehouse, and T. Andersen. "Age and petrogenetic constraints on the lower glassy ignimbrite of the Mount Somers Volcanic Group, New Zealand." New Zealand Journal of Geology and Geophysics 60, no. 3 (April 27, 2017): 209–19. http://dx.doi.org/10.1080/00288306.2017.1307232.

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18

Bierlein, Frank P., and David Craw. "Petrogenetic character and provenance of metabasalts in the aspiring and Torlesse Terranes, South Island, New Zealand: Implications for the gold endowment of the Otago Schist?" Chemical Geology 260, no. 3-4 (March 2009): 301–15. http://dx.doi.org/10.1016/j.chemgeo.2009.01.016.

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19

Brackman, Adam J., and Joshua J. Schwartz. "The formation of high-Sr/Y plutons in cordilleran-arc crust by crystal accumulation and melt loss." Geosphere, February 11, 2022. http://dx.doi.org/10.1130/ges02400.1.

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Bulk-rock data are commonly used in geochemical studies as a proxy for melt compositions in order to understand the evolution of crustal melts. However, processes of crystal accumulation and melt migration out of deep-crustal, crystal-rich mush zones to shallower storage regions raise questions about how faithfully bulk-rock compositions in plutons approximate melt compositions. This problem is particularly acute in the lower crust of arcs, where melt reservoirs are subject to periodic melt extraction that leaves behind a cumulate residue. Here, we examine bulk-rock data from the perspective of high-Sr/Y plutonic rocks in the lower crust of a well-exposed Early Cretaceous cordilleran-arc system in Fiordland, New Zealand. We test the validity of using high-Sr/Y bulk-rock compositions as proxies for melts by comparing bulk-rock compositions to melts modeled from >100 major- and trace-element analyses of 23 magmatic clinopyroxene grains from the same samples. The sampling locations of the igneous clinopyroxenes and encompassing bulk rocks are distributed across ~550 km2 of exhumed lower crust and are representative of Mesozoic lower-crustal arc rocks in the Median batholith. We confirm that bulk-rock data have characteristics of high-Sr/Y plutons (Sr/Y >50, Na2O >3.5 wt%, Sr >1000 ppm, and Y <20 ppm), features that have been previously interpreted to indicate the presence of garnet as a residual or fractionating phase. In contrast to bulk rocks, igneous clinopyroxenes have low Sr (<100 ppm), high Y (25–100 ppm), and low molar Mg# [100 × Mg/(Mg + Fe)] values (60–70), which are consistent with derivation from fractionated, low-Sr/Y melts. Chondrite-normalized rare-earth-element patterns and Sm/Yb values in clinopyroxenes also show little to no evidence for involvement of garnet in the source or in differentiation processes. Fe-Mg partitioning relationships indicate that clinopyroxenes are not in equilibrium with their encompassing bulk rocks but could have been in equilibrium with melt compositions determined from chemometry of coexisting igneous hornblendes. Moho-depth calculations based on bulk-rock Sr/Y values also yield Moho depths (average = 69 km) that are inconsistent with Moho depths based on bulk-rock Ce/Y, contact aureole studies, Al-in-horn- blende crystallization pressures, and our modeled clinopyroxene crystallization pressures. These data indicate that most Mesozoic high-Sr/Y bulk rocks in the lower crust of Fiordland are cumulates formed by plagioclase + amphibole + clinopyroxene accumulation and interstitial melt loss from crystal-rich mush zones. Our data do not support widespread fractionation of igneous garnet nor partial melting of a garnet-bearing source in the petrogenesis of these melts. We speculate that melt extraction and the production of voluminous cumulates in the lower crust were aided by unusually high heat flow and high magma addition rates associated with an Early Cretaceous arc flareup. We conclude that bulk-rock compositions are poor proxies for melt compositions in the lower crust of the Median batholith, and geochemical modeling of these high-Sr/Y bulk rocks would overemphasize the role of garnet in their petrogenesis.

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20

Sas, May, Phil Shane, Takeshi Kuritani, Georg F. Zellmer, Adam J. R. Kent, and Mitsuhiro Nakagawa. "Mush, melts and metasediments: A history of rhyolites from the Okataina Volcanic Centre, New Zealand, as captured in plagioclase." Journal of Petrology, May 1, 2021. http://dx.doi.org/10.1093/petrology/egab038.

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Abstract The Okataina Volcanic Centre (OVC), located in the Taupo Volcanic Zone, New Zealand, is a dominantly rhyolitic magmatic system in an arc setting, where eruptions are thought to be driven by mafic recharge. Here, Sr-Pb isotopes, and compositional and textural variations in plagioclase phenocrysts from ten rhyolitic deposits (two caldera, one immediately post-caldera, four intra-caldera, and three extra-caldera) are used to investigate the OVC magmatic system and identify the sources and assimilants within this diverse mush zone. Plagioclase interiors exhibit normal and reverse zoning, and are commonly in disequilibrium with their accompanying glass, melt inclusions, and whole rock compositions. This indicates that the crystals nucleated in melts that differed from their carrier magma. In contrast, the outermost rims of crystals exhibit normal zoning that is compositionally consistent with growth in cooling and fractionating melts just prior to eruption. At the intra-crystal-scale, the total suite of 87Sr/86Sr ratios are highly variable (0.7042–0.7065 ± 0.0004 average 2se), however, the majority (95%) of the crystals are internally homogeneous within error. At whole-crystal-scale (where better precision is obtained) 87Sr/86Sr ratios are much more homogeneous (0.70512–0.70543 ± 0.00001 average 2se) and overlap with their host whole rock Sr isotopic ratios. Whole-crystal Pb isotopic ratios also largely overlap with whole rock Pb ratios. The plagioclase and whole rock isotopic compositions indicate significant crustal assimilation (≥20%) of Torlesse-like metasediments (local basement rock) by a depleted mid-ocean ridge mantle magma source, and Pb isotopes require variable fluid-dominant subduction flux. The new data support previous petrogenetic models for OVC magmas that require crystal growth in compositionally and thermally distinct magmas within a complex of disconnected melt-and-mush reservoirs. These reservoirs were rejuvenated by underplating basaltic magmas that serve as an eruption trigger. However, the outermost rims of the plagioclase imply interaction between silicic melts and eruption-triggering mafic influx is largely limited to heat and volatile transfer, and results in rapid mobilization and syn-eruption mixing of rhyolitic melts. Finally, relatively uniform isotopic compositions of plagioclase indicate balanced contributions from the crust and mantle over the lifespan of the OVC magmatic system.

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21

Zellmer, Georg F., Jun-Ichi Kimura, Claudine H. Stirling, Gert Lube, Phil A. Shane, and Yoshiyuki Iizuka. "Genesis of Recent Mafic Magmatism in the Taupo Volcanic Zone, New Zealand: Insights into the Birth and Death of Very Large Volume Rhyolitic Systems?" Journal of Petrology 61, no. 2 (February 2020). http://dx.doi.org/10.1093/petrology/egaa027.

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Abstract Mafic magmatism of the rifting Taupo Volcanic Zone (TVZ) of the North Island, New Zealand, is volumetrically minor, but is thought to tap the material that provides the heat source for voluminous rhyolite production through partial melting of the crust, which ultimately results in very large volume explosive eruptions. We have studied the major and trace element chemistry of 14 mafic samples from across the entire TVZ, and the U isotopic composition of whole-rocks, groundmasses and separates of mafic mineral phases from a selection of nine samples (with the remaining five too sparsely phyric for mineral separation). Some minerals yield significant 234U enrichments despite groundmass and whole-rock close to 238U–234U secular equilibrium, pointing to uptake of variably hydrothermally altered antecrystic minerals prior to the eruption of originally sparsely phyric to aphyric mafic magmas. However, incompatible trace element patterns indicate that there are three chemically distinct groups of samples, and that samples may be used to derive primary melt compositions. We employ the latest version of the Arc Basalt Simulator (ABS5) to forward model these compositions, deriving mantle source parameters including mantle fertility, slab liquid flux, mantle volatile content, degree of melting, and P–T conditions of melt segregation. We show that mafic rocks erupted in areas of old, now inactive calderas constitute low-degree, deep melts, whereas those in areas of active caldera-volcanism are high-degree partial melts segregated from a less depleted source at an intermediate depth. Finally, high-Mg basaltic andesites erupted in the SW and NE of the TVZ point to a fertile, shallow mantle source. Our data are consistent with a petrogenetic model in which mantle melting is dominated by decompression, rather than fluid fluxing, and progresses from shallow to deeper levels with time. Melt volumes initially increase to a tipping point, at which large-scale crustal melting and caldera volcanism become prominent, and then decrease owing to progressive depletion of the mantle wedge by melting, resulting in the dearth of heat provided and eventual cessation of very large volume rhyolitic volcanism. ABS5 modelling therefore supports the notion of a direct link between the chemistry of recently erupted mafic magmas and the long-term activity and evolution of rhyolitic volcanism in the TVZ.

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