Geochemical magma type discrimination: application to altered and metamorphosed basic igneous rocks

Winchester, J. A.; Floyd, P. A.

doi:10.1016/0012-821x(76)90207-7

Cited by 748 publications

(299 citation statements)

References 44 publications

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“…14d and e). 821 Ma Bikou basalts (Wang et al, 2008); 3: 828 Ma Jinchuan mafic-ultramafic intrusions (Li et al, 2005); 4: 824 Ma Quruqtagh dolerites dikes 5: 820-850 Ma Yingfeng-Aolaoshan dolerite dikes and flood basalts (Lu et al, 2008; this study); 6: 847 Ma CFB protolith of Yuka eclogites (Song et al, 2010); 7: 877 Ma protolith of Xitieshan eclogites (Zhang et al, 20118: 828-838 Ma protolith of Dulan eclogites Yu et al, 2013); 9: 828 Ma mafic to ultramafic dikes and sills of North Guangxi (Li et al, 1999); 10: ~850 Ma Zhenzhushan bimodal volcanic rocks, Wuyi basalts/gabbros, Gangbian alkaline complex and Shenwu dolerite dikes (Li et al, 2008b(Li et al, , 2010aShu et al, 2011) (Winchester and Floyd, 1976). (b) Ti/Y versus (Sm/Yb) n (subscript n denotes "chondrite-normalized").…”

Section: Tectonic Evolution From Supercontinental Breakup To Continenmentioning

confidence: 73%

An 850–820Ma LIP dismembered during breakup of the Rodinia supercontinent and destroyed by Early Paleozoic continental subduction in the northern Tibetan Plateau, NW China

Song

Allen

et al. 2016

Precambrian Research

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Section: Tectonic Evolution From Supercontinental Breakup To Continenmentioning

confidence: 73%

An 850–820Ma LIP dismembered during breakup of the Rodinia supercontinent and destroyed by Early Paleozoic continental subduction in the northern Tibetan Plateau, NW China

Song

Allen

et al. 2016

Precambrian Research

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“…They are characterized by variable Mg # (100×Mg 2+ /(Fe 2+ +Mg 2+ )) (35-67), Cr (3.08-578 ppm) and Ni (12.4-107 ppm) contents. These rocks have Nb/Y ratios of 0.19-0.96, plotting exclusively in the subalkaline-basalt field on the Nb/Y versus Zr/TiO 2 diagram of Winchester and Floyd (1976) (Fig. 6a).…”

Section: Geochemical Characteristicsmentioning

confidence: 99%

Metasomatized lithosphere–asthenosphere interaction during slab roll-back: Evidence from Late Carboniferous gabbros in the Luotuogou area, Central Tianshan

Tang

Wang

Wyman

et al. 2012

Lithos

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“…The immobile nature of Ti, Zr, P, Y, Nb means that they are neither affected by low-temperature alteration nor by metamorphism (e.g., Winchester and Floyd 1976;Pearce and Norry 1979) in the metamorphic P-T range experienced by the studied samples. This is supported by the fairly good correlation on variation diagrams of Zr.…”

Section: Geochemistrymentioning

confidence: 98%

Tectonic significance of Triassic mafic rocks in the June Complex, Sanandaj–Sirjan zone, Iran

et al. 2017

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This study concentrates on the petrological and geochemical investigation of mafic rocks embedded within the voluminous Triassic June Complex of the central Sanandaj-Sirjan zone (Iran), which are crucial to reconstruct the geodynamics of the Neotethyan passive margin. The Triassic mafic rocks are alkaline to sub-alkaline basalts, containing 43.36-49.09 wt% SiO 2 , 5.19-20.61 wt% MgO and 0.66-4.59 wt% total alkalis. Based on MgO concentrations, the mafic rocks fall into two groups: cumulates (Mg# = 51.61-58.94) and isotropic basaltic liquids (Mg# = 24.54-42.66). In all samples, the chondrite-normalized REE patterns show enrichment of light REEs with variable (La/Yb) N ratios ranging from 2.48 to 9.00, which confirm their amalgamated OIB-like and E-MORB-like signatures. Enrichment in large-ion lithophile elements and depletion in high field strength elements (HFSE) relative to the primitive mantle further support this interpretation. No samples point to crustal contamination, all having undergone fractionation of olivine ? clinopyroxene ? plagioclase. Nevertheless, elemental data suggest that the substantial variations in (La/Sm) PM and Zr/Nb ratios can be explained by variable degrees of partial melting rather than fractional crystallization from a common parental magma. The high (Nb/Yb) PM ratio in the alkaline mafic rocks points to the mixing of magmas from enriched and depleted mantle sources. Abundant OIB alkaline basalts and rare E-MORB appear to be linked to the drifting stage on the northern passive margin of the Neotethys Ocean.

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Geochemical magma type discrimination: application to altered and metamorphosed basic igneous rocks

Cited by 748 publications

References 44 publications

An 850–820Ma LIP dismembered during breakup of the Rodinia supercontinent and destroyed by Early Paleozoic continental subduction in the northern Tibetan Plateau, NW China

An 850–820Ma LIP dismembered during breakup of the Rodinia supercontinent and destroyed by Early Paleozoic continental subduction in the northern Tibetan Plateau, NW China

Metasomatized lithosphere–asthenosphere interaction during slab roll-back: Evidence from Late Carboniferous gabbros in the Luotuogou area, Central Tianshan

Tectonic significance of Triassic mafic rocks in the June Complex, Sanandaj–Sirjan zone, Iran

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