The chemical variation and evolution of the super-units of the segmented Coastal Batholith

Atherton, M. P.; Sanderson, Leonie

doi:10.1007/978-1-4899-5820-4_18

Cited by 31 publications

(20 citation statements)

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“…The essentially identical characteristics of the other DVla granitoids described by Allibone et al (1993a, b) and Cox & Allibone (1991) are also consistent with an I-type classification. Rb, Sr, Na2O, K2O, and A12O3 contents of these rocks are similar to those documented in Cordilleran I-type granitoids developed in volcanic arcs along continental margins (e.g., Atherton & Sanderson 1985).…”

Section: Petrogenesis Source Criteria and Tectonic Setting Of The Dsupporting

confidence: 52%

“…This set of petrographic and geochemical features is not typical of either S-type or I-type granitoids as described by White & Chappell (1983). DVlb suite Sr, Na 2 O, and A1 2 O 3 contents are considerably higher and exhibit steeper negative correlations with SiO 2 than typical Cordilleran I-type granitoids, similar to the DVla suite rocks (e.g., Atherton & Sanderson 1985), although these features are partly analogous to the chemistry of tonalites and trondhjemites (e.g., Manduca et al 1992;Barnes et al 1992).…”

Section: Source Criteria and Petrogenesis Of Dvla And Dvlb Suitesmentioning

confidence: 84%

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Granitoids of the Dry Valleys area, southern Victoria Land: Geochemistry and evolution along the early Paleozoic Antarctic Craton margin

Allibone

Cox

Smillie

1993

New Zealand Journal of Geology and Geophysics

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Field relationships and geochemistry indicate granitoid plutons of the Dry Valleys area comprise at least three petrogenetically distinct suites. The older Dry Valleys 1a (DV1a) suite, comprising the Bonney, Catspaw, Denton, Cavendish, and Wheeler Plutons and hornblende-biotite orthogneisses, and Dry Valleys 1b (DV1b) suite, comprising the Hedley, Valhalla, St Johns, Dun, Calkin, and Suess Plutons, biotite granitoid dikes and biotite orthogneisses, were emplaced before prominent swarms of Vanda mafic and felsic dikes. Both the DV1a and DV1b suites are time transgressive, with older intrusions in each suite being emplaced during the later stages of deformation of the Koettlitz Group. Younger granitoids that postdate the majority of the Vanda dikes include: the Dry Valleys 2 (DV2) suite, comprising the Pearse and Nibelungen Plutons plus several smaller, unnamed plugs; and the Harker, Swinford, Orestes, and Brownworth Plutons with identical field relationships and enclaves but distinct chemistries.Chemical characteristics and limited Rb-Sr isotopic dating indicate plutonism before c. 500 Ma was dominated by the Cordilleran I-type DV1a suite, inferred to have developed during melting above a west-dipping subduction zone along the Antarctic Craton margin. The chemical characteristics of the DV1b suite indicate large-scale melting of a quartzofeldspathic protolith lacking residual plagioclase, but containing refractory garnet. Potential DV1b suite source rocks include metamorphosed immature sediments, possibly underplated along the subduction zone associated with DV1a magmatism, or older granitoid orthogneisses. Major DV1b plutonism at 490 Ma marks the end of subduction-related plutonism in southern Victoria Land. Younger DV2 alkalicalcic, Caledonian I-type plutonism is inferred to have formed in response to uplift and extension between 480 and 455 Ma. G92027 Received 2 June 1992; accepted 29 April 1993Lack of DV2 suite correlatives and Vanda mafic and felsic dikes in northern Victoria Land suggests significantly different tectonomagmatic histories along the early Paleozoic Antarctic Craton margin.

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Section: Petrogenesis Source Criteria and Tectonic Setting Of The Dsupporting

confidence: 52%

Section: Source Criteria and Petrogenesis Of Dvla And Dvlb Suitesmentioning

confidence: 84%

Granitoids of the Dry Valleys area, southern Victoria Land: Geochemistry and evolution along the early Paleozoic Antarctic Craton margin

Allibone

Cox

Smillie

1993

New Zealand Journal of Geology and Geophysics

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“…ment is emplaced along the axis of a marginal basin (Section 7.5) into country rocks consisting of 'new' crust; lavas, dykes, sills and basic plutons. It is probable that all of the magmas which built up this segment were derived by crystal fractionation of mantle-derived parental basalts with comparatively little crustal involvement (Atherton & Sanderson 1985), as evidenced by their low 87Sr/86Sr ratios. However, it is important to realize that the young crust into which this segment of the batholith is emplaced will be isotopically similar to the primary magmas and thus crustal contamination may in fact be extensive but not detectable isotopically.…”

Section: Nd-srisotopesmentioning

confidence: 99%

Igneous Petrogenesis

Wilson

2000

330

383

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“…According to Atherton and Sanderson (1985) the western slopes of the Peruvian Andes North of 14°S are comprised of granodioritic plutons, such as the Cordillera Blanca Batholith and the Coastal Batholith. Although the composition of batholiths (and corresponding volcanic extrusions) show some regional chemical variation from basic to acidic (Atherton and Sanderson, 1985) the overall chemical TM composition delivered to Peruvian sediments is andesitic.…”

Section: Lithogenic Background For Peruvian Upwelling Sedimentsmentioning

confidence: 99%