Origin and evolution of mid-Cretaceous, garnet-bearing, intermediate and silicic volcanics from Canterbury, New Zealand

Barley, M. E.

doi:10.1016/0377-0273(87)90047-3

Cited by 37 publications

(35 citation statements)

References 35 publications

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“…Approximately coeval, but geochemically distinct, volcanics occur at Mt Somers in central Canterbury (Barley 1987), some 300 km to the southwest. The compositions of all of the alkaline igneous units from Marlborough indicate that they were erupted in an extensional, intraplate, tectonic regime.…”

Section: Significance Of Inferred Teratan Basaltsmentioning

confidence: 99%

Burnt Creek Formation and Late Cretaceous basin development in Marlborough, New Zealand

Crampton

Laird

1997

New Zealand Journal of Geology and Geophysics

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Burnt Creek Formation is a Cretaceous sedimentary unit that has been identified from a restricted geographic area southeast of the Ouse Fault in the Coverham-Kekerengu valley region, Marlborough. It comprises a fining-upwards succession of conglomerate, pebbly mudstone, sandstone, sandstone-siltstone couplets, siltstone, and contorted beds. Coarser beds are inferred to have been deposited by a range of submarine sediment gravity-flow processes, in particular debris flows and turbidity currents, in an outer neritic or upper bathyal environment. Burnt Creek Formation was deposited during the Mangaotanean and Teratan ages (middle Turonian-early Santonian). Older parts of the formation occupy a small (c. 1 km across), east-west or northeast-southwest trending, asymmetric basin. They record onlap of an incised valley or deposition adjacent to a synsedimentary fault that was downthrown to the north.The Ouse Fault is inferred to have been a major normal fault during the Clarence Epoch (Albian-Cenomanian) and for at least part of the Raukumara Epoch (CenomanianSantonian). Regional extension in Marlborough is suggested also by the presence of Ngaterian (latest Albian -late Cenomanian) and probable Teratan (early Coniacian -early Santonian) intraplate, alkaline basalts. In the Miocene the Ouse Fault was reactivated as a reverse fault, and crustal shortening of perhaps several kilometres juxtaposed the Cretaceous successions now found on either side of the fault.

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Section: Significance Of Inferred Teratan Basaltsmentioning

confidence: 99%

Burnt Creek Formation and Late Cretaceous basin development in Marlborough, New Zealand

Crampton

Laird

1997

New Zealand Journal of Geology and Geophysics

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“…Phenocrysts are quartz, sanidine, and plagioclase, plus minor biotite, garnet, magnetite, ilmenite, allanite, and zircon. Barley (1987) also reported orthopyroxene and monazite, but the only orthopyroxene seen by the present authors appeared to be xenocrystic, and no monazite was identified.…”

Section: Woolshed Creek Ignimbritementioning

confidence: 75%

“…These indicate a peraluminous composition. In addition, the characteristic K>Na and initial Sr-isotope >0.708 (Barley 1987) indicate that the ignimbrites are of S-type composition. Rb (204-258 ppm) displays a marked positive correlation with SiC>2, consistent with its incompatible nature, whereas Sr (71-129 ppm), Ba (482-1243 ppm), Y (41-80 ppm), and Zr (140-317 ppm) show marked negative correlations with SiC> 2 , indicating they are compatible.…”

Section: Elemental Variationmentioning

confidence: 99%

“…The Mount Somers Volcanics Group members have been sampled comprehensively by Oliver (1977) and Barley (1987). These workers established that the group represents a calc-alkaline suite of peraluminous rhyolites and dacites, and medium-high-K andesites.…”

Section: Geochemistrymentioning

confidence: 99%

“…These workers established that the group represents a calc-alkaline suite of peraluminous rhyolites and dacites, and medium-high-K andesites. Barley (1987) interpreted volcanism as being the result of magma flux from the mantle, in which the andesites evolved from mantle-derived tholeiitic magmas by fractional crystallisation and assimilation of lower crustal material, and the dacites and rhyolites were derived by partial melting of dominantly quartzofeldspathic Torlesse sediments.…”

Section: Geochemistrymentioning

confidence: 99%

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Stratigraphic and petrological variation of the Mount Somers Volcanics Group, mid Canterbury, New Zealand

Smith

Cole

1996

New Zealand Journal of Geology and Geophysics

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Mt Somers, mid Canterbury, New Zealand, consists of seven temporally distinct Upper Cretaceous volcanic formations which together form the Mount Somers Volcanics Group. These formations are the Surrey Hills Tuff, Barrosa Andesite, Woolshed Creek Ignimbrite (new name), Somers Rhyolite, Somers Ignimbrite (new name), volcanic conglomerates and tuffs, and Hinds River Dacite.Surrey Hills Tuff comprises both massive and bedded rhyolitic tuff and records the first explosive silicic volcanism at Mt Somers. Barrosa Andesite occurs as porphyritic pyroxene andesite flows, breccias, and shallow intrusives in the north and northwest of the area and is considered to represent an eroded stratocone. The main period of silicic volcanism began with the formation of Woolshed Creek Ignimbrite, a black, glassy, porphyritic vitrophyre containing up to 15% lithic fragments. Its massive, glassy nature is due to fusion by the overlying Somers Rhyolite, which comprises nearly 1000 m thickness of coalesced rhyolite lava domes with minor lava flows and shallow intrusives. The rhyolites are porphyritic with phenocrysts of sanidine, quartz, plagioclase, and minor garnet and iron oxide in a devitrified groundmass. Somers Rhyolite is overlain by Somers Ignimbrite Formation-high grade ignimbrites with an extant volume of >6.8 km 3 that were erupted from a source to the north of Mt Somers. The ignimbrites form numerous sheets that represent major, temporally discrete deposits that ponded within a paleotopographic depression. They have the same mineralogy as the rhyolite. The emplacement of successive sheets followed rapidly with the overall eruption perhaps occurring over a time period of days to weeks. At the end of the ignimbrite eruptions, volcanic laharic conglomerates and tuffs were deposited, of which only small remnants remain in a restricted area to the northwest side of Mt Somers. Finally, plagioclase-phyric and biotite-phyric andesite and dacite dikes, considered to be related to Hinds River Dacite, were emplaced through earlier Mount Somers Volcanics Group units. G95037 Received 11 May 1995; accepted 7 March 1996The Somers ignimbrites and rhyolite are geochemically related and are both derived from a deep crustal source by partial melting of quartzofeldspathic Torlesse Supergroup sediments. Geochemical zonation in ignimbrites reflects extraction from a compositionally zoned magma chamber comprising more differentiated magma overlying less differentiated magma. Andesite dikes that postdate Somers Ignimbrite Formation are geochemically related to Hinds River Dacite.

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Compositional Zoning and Cation Diffusion in Garnets

Chakraborty¹,

Ganguly²

1991

Advances in Physical Geochemistry

168

111

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Origin and evolution of mid-Cretaceous, garnet-bearing, intermediate and silicic volcanics from Canterbury, New Zealand

Cited by 37 publications

References 35 publications

Burnt Creek Formation and Late Cretaceous basin development in Marlborough, New Zealand

Burnt Creek Formation and Late Cretaceous basin development in Marlborough, New Zealand

Stratigraphic and petrological variation of the Mount Somers Volcanics Group, mid Canterbury, New Zealand

Compositional Zoning and Cation Diffusion in Garnets

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