Oceanic plagiogranite

Coleman, Robert G.; Peterman, Zell E.

doi:10.1029/jb080i008p01099

Cited by 346 publications

(156 citation statements)

References 32 publications

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“…The low-index glass is enriched in silica and sodium, and is similar to the immiscible low-index glass of the experimental products of Massion and Koster von Groos (1973). The composition of this low-index glass nearly coincides with that of the plagiogranite of Coleman and Peterman (1975).…”

Section: Liquid Immiscible Droplet (Plate 2)mentioning

confidence: 62%

“…The low-index glass in the mesostasis of the massive lava of Leg 46 (Figure 2) has a composition of plagiogranite of Coleman and Peterman (1975). Petrographic data indicate that the mesostasis represent the residual melt after 95 to 98 per cent of the groundmass has crystallized.…”

Section: Discussionmentioning

confidence: 99%

“…The fractionation behavior of ocean-floor Figure 1. The hatched area is the compositional field of plagiogranite, CT; continental trondhjemite, GR; granophyre, taken from Coleman and Peterman (1975).…”

Section: Discussionmentioning

confidence: 99%

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Segregation Vesicles and Immiscible Liquid Droplets in Oceanfloor Basalt of Hole 396B, IPOD/DSDP Leg 46

Sato¹

1979

Initial Reports of the Deep Sea Drilling Project

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Section: Liquid Immiscible Droplet (Plate 2)mentioning

confidence: 62%

Section: Discussionmentioning

confidence: 99%

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Segregation Vesicles and Immiscible Liquid Droplets in Oceanfloor Basalt of Hole 396B, IPOD/DSDP Leg 46

Sato¹

1979

Initial Reports of the Deep Sea Drilling Project

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“…6). The geochemical similarity between the north Kozara acid rocks and the plagiogranites occurring in Upper Jurassic ophiolites of the Eastern Vardar Zone is present, although the former do not have the trondhjemitic composition, typical for oceanic plagiogranites (Coleman & Peterman 1975;Coleman & Donato 1979). Plagiogranites are generally interpreted as originating from: i) extensive fractionation of parental tholeiitic magma (e.g.…”

Section: The Origin Of Acid Magmatism: a Petrogenetic Link To The Basmentioning

confidence: 99%

The Upper Cretaceous ophiolite of North Kozara – remnants of an anomalous mid-ocean ridge segment of the Neotethys?

Cvetković¹,

Šarić²,

Grubić³

et al. 2014

Geologica Carpathica

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This study sheds new light on the origin and evolution of the north Kozara ophiolite, a part of the Sava-Vardar Zone. The Sava-Vardar Zone is regarded as a relict of the youngest Tethyan realm in the present-day Balkan Peninsula. The north Kozara ophiolite consists of a bimodal igneous association comprising isotropic to layered gabbros, diabase dykes and basaltic pillow lavas (basic suite), as well as relicts of predominantly rhyodacite lava flows and analogous shallow intrusions (acid suite). The rocks of the basic suite show relatively flat to moderately light-REE enriched patterns with no or weak negative Eu-anomaly, whereas those of the acid suite exhibit steeper patterns and have distinctively more pronounced Eu-and Sr-negative anomalies. Compared to the known intra-ophiolitic granitoids from the Eastern Vardar Zone, the acid suite rocks are most similar to those considered to be oceanic plagiogranites. The new geochemical data suggest that the basic suite rocks are similar to enriched mid-ocean ridge basalts. The geochemical characteristics of the acid suite rocks indicate that their primary magmas most probably originated via partial melting of gabbros from the lower oceanic crust. Our study confirms the oceanic nature of the north Kozara Mts rock assemblage, and suggests that it may have formed within an anomalous ridge setting similar to present-day Iceland.

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“…These rocks are generally grouped under the generic term``plagiogranite'' [Coleman and Peterman, 1975]. Stage 3 plutonic rocks typically intrude at high levels within the plutonic complex, forming tabular, sill-like plutons between the layered gabbros and the sheeted dike complex.…”

Section: Stage 3: Maturitymentioning

confidence: 99%

Birth, death, and resurrection: The life cycle of suprasubduction zone ophiolites

Shervais

2001

Geochem Geophys Geosyst

455

275

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[1] Abstract: Suprasubduction zone (SSZ) ophiolites display a consistent sequence of events during their formation and evolution that suggests that they form in response to processes that are common to all such ophiolites. This sequence includes the following: (1) birth, which entails the formation of the ophiolite above a nascent or reconfigured subduction zone; this stage is typically characterized by the eruption of arc tholeiite lavas and the formation of layered gabbros and sheeted dike complex; (2) youth, during which is continued melting of refractory asthenosphere (depleted during birth) occurs in response to fluid flux from the subducting slab, with extensional deformation of the older plutonic suite, eruption of refractory lavas, and the intrusion of wehrlite-pyroxenite; (3) maturity, with the onset of semistable arc volcanism, typically calc-alkaline, as the subduction zone matures and stabilizes, and the intrusion of quartz diorite and eruption of silicic lavas; and (4) death, which is the sudden demise of active spreading and ophiolite-related volcanism, which in many cases is linked to collision with an active spreading center and the onset of shallow underthrusting of the buoyant spreading axis; expressed as dikes and lavas with oceanic basalt compositions that crosscut or overlie rocks of the older suites; (5) resurrection, with emplacement by obduction onto a passive margin or accretionary uplift with continued subduction. The early stages (1± 3) may be diachronous, and each stage may overlap in both time and space. The existence of this consistent progression implies that ophiolite formation is not a stochastic event but is a natural consequence of the SSZ tectonic setting.

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Oceanic plagiogranite

Cited by 346 publications

References 32 publications

Segregation Vesicles and Immiscible Liquid Droplets in Oceanfloor Basalt of Hole 396B, IPOD/DSDP Leg 46

Segregation Vesicles and Immiscible Liquid Droplets in Oceanfloor Basalt of Hole 396B, IPOD/DSDP Leg 46

The Upper Cretaceous ophiolite of North Kozara – remnants of an anomalous mid-ocean ridge segment of the Neotethys?

Birth, death, and resurrection: The life cycle of suprasubduction zone ophiolites

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