Age and provenance of granitoid clasts in Moeatoa Conglomerate, Kawhia Syncline, New Zealand

Graham, Ian; Korsch, R. J.

doi:10.1080/03036758.1990.10426731

Cited by 22 publications

(10 citation statements)

References 21 publications

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“…This is supported by Keane (1986) and Graham & Korsch (1990) who noted that some clasts in the Moeatoa Conglomerate were hydrothermally altered. Dickinson & Suczek (1979), Dickinson et al (1983), and Marsaglia & Ingersoll (1992).…”

Section: Temporal Variations In Modal Abundancesupporting

confidence: 65%

“…The granitoids and metamorphic rocks suggest derivation from a plutonic and low-to mediumgrade regionally metamorphosed terrane from a continental interior. The plutonic rocks were supplied in only minor amounts and were most common in the latest Triassic Moeatoa Conglomerate, in which Keane (1986) and Graham & Korsch (1990) described a variety of granitoids (granites, granodiorites, tonalites, quartz monzodiorites, and hypabyssal equivalents). Furthermore, some rocks have been hydrothermally altered, probably in conjunction with intermediate to silicic volcanism.…”

Section: Discussionmentioning

confidence: 99%

“…Alternating sandstones and mudstones are generally well bedded and graded, and show features typical of turbidite deposition (Ballance & Campbell 1993). Turbidite facies range from conglomerate dominated (e.g., the Moeatoa Conglomerate; Keane 1986;Graham & Korsch 1990) to mud dominated (e.g., at Port Waikato; Ballance 1988). Some facies contain fining-upward, coarsening-upward, and coarsening-to-finingupward cycles, compatible with submarine fan deposition (Boggs 2001).…”

Section: Geologic Settingmentioning

confidence: 99%

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Provenance history of a Late Triassic‐Jurassic Gondwana margin forearc basin, Murihiku Terrane, North Island, New Zealand: Petrographic and geochemical constraints

Briggs

Middleton

Nelson

2004

New Zealand Journal of Geology and Geophysics

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The Murihiku Terrane in the North Island was a forearc basin adjacent to a volcanic arc along the eastern margin of Gondwana during the Mesozoic. The rocks that infill the basin are mainly volcaniclastic sandstones and mudstones, often turbiditic, with sparse shellbeds, rhyolitic tuffs, carbonaceous sandstones, plant beds, concretionary horizons, and rare thick granitoid-rich conglomerates. Petrographic studies of the rock fragments in the sandstones show that andesites are the dominant lithic type, but there is a wide range of other lithologies, including dacites, rhyolites, ignimbrites, granitoids, quartzofeldspathic mica schists, rare amphibolites, and reworked mudstones and sandstones. The sandstones are texturally and mineralogically immature and suggest deposition relatively close to a source of high relief, undergoing physical rather than chemical weathering in cool-to cold-temperate conditions. Geochemical analyses of 67 whole-rock volcaniclastic sandstones and siltstones indicate that they were derived from an active and dissected volcanic arc in a convergent margin setting built upon relatively thin continental crust. Modal petrographic data and whole-rock geochemistry both confirm that there were systematic variations with time in the composition of clastic material being supplied to the basin. From the Late Triassic to Middle Jurassic, there was a decrease in silicic volcanic material, plutonics, and metamorphics, and an increase in the supply of andesitic detritus. This was followed in the Late Jurassic by a broader range of volcanic detritus, varying from basaltic andesite to rhyolite, which may have been caused by progressive extension of the volcanic arc and thinning of the crust, a precursor to the breakup of Gondwana in the Early-Middle Cretaceous. Comparison with the Southland segment of the Murihiku Terrane in the South Island suggests that there were significant along-arc source variations, with relatively less silicic but greater andesitic and continental crust contributions in the North Island than in Southland. This may be analogous to the modern Taupo-Kermadec arc where there is a south-north along-arc transition from a continental to an oceanic arc.

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Section: Temporal Variations In Modal Abundancesupporting

confidence: 65%

Section: Discussionmentioning

confidence: 99%

Section: Geologic Settingmentioning

confidence: 99%

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Provenance history of a Late Triassic‐Jurassic Gondwana margin forearc basin, Murihiku Terrane, North Island, New Zealand: Petrographic and geochemical constraints

Briggs

Middleton

Nelson

2004

New Zealand Journal of Geology and Geophysics

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“…However, such bulk compositional data provide no information on the age of detritus being supplied; the usual assumption with poorly sorted subangular clastic rocks is that detritus is first cycle. The few New Zealand provenance studies involving radiometric dating of detritus include Graham & Korsch (1990; Rb-Sr dating of conglomerate clasts), Ireland (1992; U-Pb dating of detrital zircon in sandstones), and Adams & Kelley (1998; Ar-Ar dating of detrital muscovite).…”

Section: Introductionmentioning

confidence: 99%

Relationships between the brook street Terrane and Median Tectonic Zone (Median Batholith): Evidence from Jurassic conglomerates

Tulloch

Kimbrough

Landis

et al. 1999

New Zealand Journal of Geology and Geophysics

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“…These rocks occur in the Nelson and Fjordlands blocks to the northeast and southwest, respectively, of Gillespie's Beach. Late Triassic to early Jurassic ages are displayed by granitic cobbles in conglomerates (226 ± 6 Ma, Graham & Korsch 1990), the Sams Creek peralkaline granite (226 ± 1.1 Ma, Tulloch 1992), and some metarhyolites (~200 Ma, King et al 1985). A younger, major subduction-related event consisting of I-type magmatism occurred between 156 and 130 Ma (Kimbrough et al 1993(Kimbrough et al , 1994a.…”

Section: Thsio 4 Ages and The Regional Geology Of South Islandmentioning

confidence: 99%

COMPOSITION AND Th - U - TOTAL Pb AGES OF HUTTONITE AND THORITE FROM GILLESPIE'S BEACH, SOUTH ISLAND, NEW ZEALAND

Förster¹,

Harlov²,

Milke³

2000

The Canadian Mineralogist

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The average result of 49 electron-microprobe spot analyses of huttonite (monoclinic ThSiO 4 ) from its type locality, Gillespie's Beach, southern Westland, New Zealand, yields the following chemical composition (in wt.%, ± 1 standard deviation in italics in parentheses): P 2 O 5 0. 43 (0.13 . The chondrite-normalized REE patterns are umbrella-like, with Gd being the most prominent rare-earth element. The P, U, Fe, and total REE contents of the grains studied differ strongly from those of the type material published by Pabst & Hutton (1951) . Th -U -total Pb dating reveals a late Tertiary (Miocene) age for the huttonite. The thorite records older ages, from late Triassic-early Jurassic to early Tertiary. All ages coincide with major metamorphic or magmatic events on South Island. Rocks that formed in the experimentally derived P-T stability field of huttonite are unknown in the area. There thus are suggestions of discrepancies between the experimental data on huttonite-thorite phase relations and those observed in natural systems.Keywords: huttonite, thorite, electron-microprobe analysis, Th -U -total Pb age, regional geology, Gillespie's Beach, SouthIsland, New Zealand. SOMMAIRELa composition moyenne de la huttonite (ThSiO 4 monoclinique), déterminée à partir de 49 analyses ponctuelles à la microsonde électronique d'échantillons de la localité-type, Gillespie's Beach, Westland du sud, en Nouvelle-Zélande, est comme suit (en % pondéraux, ± 1 écart-type en italiques entre parenthèses): P . Une datation fondée sur les teneurs en Th, U et Pb total révèle un âge tertiaire tardif (miocène) de formation de la huttonite. En revanche, la thorite indique un âge de formation plus ancien, allant de triassique tardif ou jurassique précoce à tertiaire précoce. Tous les âges coïncident avec des événements métamorphiques ou magmatiques majeurs à South Island. On ne connait pas de roches qui ont été formées dans des conditions P-T qui correspondent au champ de stabilité de la huttonite, telles qu'établies par expériences. Les relations de phases entre thorite et huttonite déduites à partir des études expérimentales ne concordent pas bien avec les observations de terrain.(Traduit par la Rédaction)

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Age and provenance of granitoid clasts in Moeatoa Conglomerate, Kawhia Syncline, New Zealand

Cited by 22 publications

References 21 publications

Provenance history of a Late Triassic‐Jurassic Gondwana margin forearc basin, Murihiku Terrane, North Island, New Zealand: Petrographic and geochemical constraints

Provenance history of a Late Triassic‐Jurassic Gondwana margin forearc basin, Murihiku Terrane, North Island, New Zealand: Petrographic and geochemical constraints

Relationships between the brook street Terrane and Median Tectonic Zone (Median Batholith): Evidence from Jurassic conglomerates

COMPOSITION AND Th - U - TOTAL Pb AGES OF HUTTONITE AND THORITE FROM GILLESPIE'S BEACH, SOUTH ISLAND, NEW ZEALAND

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