Geochemistry of the Greenland Group (early Ordovician), New Zealand

Nathan, Simon

doi:10.1080/00288306.1976.10426314

Cited by 73 publications

(33 citation statements)

References 23 publications

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“…Essential characteristics of these rocks have been discussed by Gage (1948), Laird (1972), Cooper (1974), Adams et aI. (1975), and Nathan (1976Nathan ( , 1978 and are summarised below.…”

Section: Regional Geological Settingmentioning

confidence: 99%

Geology, geochemistry, mineralisation, and metal zoning of the McConnochie greisenised granite, Reefton district, Westland, New Zealand

Pirajno¹

1982

New Zealand Journal of Geology and Geophysics

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A high-level, small gramtic body, informally named McConnochie greisenised granite, was emplaced within Greenland Group rocks, probably above the roof region of a subjacent pluton, in the Reefton-Victoria Range area of Westland, New Zealand.The McConnochie greisenised granite is a highly evolved member of a granite series forming the western margin of the Karamea Batholith in the area of study and shows an apparent overall S-type chemistry. It was originally a granodiorite which was subjected to varying degrees of postmagmatic alteration (greisenisation) during the Cretaceous. The greisenisation affected both the original granodiorite body (endogreisen) and the surrounding country rock (exogreisen).Mineralisation occurs in both endogreisen and exogreisen rocks and consists of pyrite, marcasite, chalcopyrite, molybdenite, minor sphalerite, and native bismuth. Sn mineralisation probably occurred near the top of the greisenised granite cupola, but was later removed by erosion. This is shown by a vertical geochemical zonation in which Sn values decrease with depth in the drill core, whereas Cu and Mo are enriched in the lower and more greisenised parts of the granite body.It is possible that muscovitisation of biotite is, at least in part, responsible for the release of the ore metals during greisenisation and associated hydrothermal activity.

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“…Essential characteristics of these rocks have been discussed by Gage (1948), Laird (1972), Cooper (1974), Adams et aI. (1975), and Nathan (1976Nathan ( , 1978 and are summarised below.…”

Section: Regional Geological Settingmentioning

confidence: 99%

Geology, geochemistry, mineralisation, and metal zoning of the McConnochie greisenised granite, Reefton district, Westland, New Zealand

Pirajno¹

1982

New Zealand Journal of Geology and Geophysics

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“…The Buller Terrane is composed of a uniform sequence of quartzose greywacke (Greenland Group;Nathan 1976) that is intruded and metamorphosed by Paleozoic (370-310 Ma) biotite and/or muscovite-bearing granites, granodiorites, and tonalites (Karamea Suite;Aronson 1968;Tulloch 1983Tulloch , 1988. Early Cretaceous granitoids of the Rahu and Separation Point Suites are subordinate to Karamea Suite granitoids in the Buller Terrane (Tulloch 1988).…”

Section: ° E 100km N 175°fmentioning

confidence: 99%

Transpressional development of the Australia‐Pacific boundary through southern South Island, New Zealand: Constraints from Miocene‐Pliocene sediments, Waiho‐1 borehole, South Westland

Sutherland

1996

New Zealand Journal of Geology and Geophysics

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“…Chondrite normalised spider diagrams for rare earth elements (after Saunders & Tarney, 1984) Also the negative anomaly also implies a less fractionated source probably of andesitic origin. In tectonic settings where plagioclase is not found, there is no evidence of systematic Eu enrichment in sediments over co-existing muds (Nathan, 1976;Bhatia, 1985). This accounts for the depletion of Eu especially in sands that have been re-worked.…”

Section: Rare Earth Elements Geochemistrymentioning

confidence: 93%

Provenance Studies of Sandstone Facies Exposed Near Igbile Southwestern Nigeria: Petrographic and Geochemical Approach

Ikhane¹,

Akintola²,

Bankole³

et al. 2014

JGG

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The petrography, as well as the major, trace and rare earth element compositions of ten (10) sandstone samples of Maastrichtian Afowo Formation exposed near Igbile, Southwestern Nigeria, have been investigated to determine their provenance, source area weathering conditions, paleoclimate and tectonic setting using petrographic analysis and Inductively Coupled Plasma -Mass Spectrometry (ICP-MS).Results of the petrographic analysis revealed that quartz is the most dominant detrital mineral with (86%) followed by weathered plagioclase feldspar (5.10%) and rock fragments (10.9%). The quartz grain is sub-angular to sub-rounded in shape and the sandstones were classified as quartz arenites, sublitharenites and subarkoses based on framework composition of quartz, feldspar and rock fragment plots. This suggests a recycled orogen source for the sandstones and deposition in a humid climate, evidenced by the weathered feldspars. Eleven (11) major, seventeen (17) trace and fourteen (14) rare earth elements were obtained from the geochemical analysis. The major elements values range in concentration from 0.01%-81.39% with SiO 2 being the dominant oxide followed by Al 2 O 3 and Fe 2 O 3 constituting over 95% of the major oxides; K 2 O, TiO 2 , Na 2 O, CaO, MgO and P 2 O 5 made up the remaining 5%. The average ratio of SiO 2 /Al 2 O 3 valued 4.31 for the sandstone is appreciably high indicating that it has been heavily weathered. The trace elements range in concentration from 0.2 ppm-1651.2 ppm with Zr being the most dominant element an indication of orogenic recycling. The rare earth elements range in concentration from 0.01 ppm-163.7 ppm with Ce having the highest concentration, depicting that the sandstones were deposited in an oxidizing environment. Also, the trace element relationship illustrated from the spider plot shows chemical coherence and uniformity of the sandstones. The chondrite normalized rare earth elements (REE) plot shows enrichment in the Light REE over the heavy REE for the sediment with strong negative Eu anomaly values between (0.57-0.69) suggesting a felsic provenance derived from upper continental crust for the sandstones.

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Geochemistry of the Greenland Group (early Ordovician), New Zealand

Cited by 73 publications

References 23 publications

Geology, geochemistry, mineralisation, and metal zoning of the McConnochie greisenised granite, Reefton district, Westland, New Zealand

Geology, geochemistry, mineralisation, and metal zoning of the McConnochie greisenised granite, Reefton district, Westland, New Zealand

Transpressional development of the Australia‐Pacific boundary through southern South Island, New Zealand: Constraints from Miocene‐Pliocene sediments, Waiho‐1 borehole, South Westland

Provenance Studies of Sandstone Facies Exposed Near Igbile Southwestern Nigeria: Petrographic and Geochemical Approach

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