Petrogenesis of plagiogranites from the Troodos Ophiolite Complex, Cyprus

Marien, Chris S.; Hoffmann, J. Elis; Garbe-Schönberg, Carl-Dieter; Münker, Carsten

doi:10.1007/s00410-019-1569-3

Cited by 20 publications

(12 citation statements)

References 97 publications

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“…Concerning the Tethyan realm, plagiogranites have been recognized as dikes and beds in the ophiolithic rocks of the western Alps, in Corsica, and in the northern Apennines (Castelli et al, 2002;Montanini et al, 2006). Also if the oceanic plagiogranites are volumetrically minor in the ophiolitic sequences, their origin has been largely debated due to importance of these rocks to understand the Earth's continental lithosphere evolution of (Marien et al, 2019). Several authors (Berndt et al, 2005) proposed that the plagiogranites are the products of fractional crystallization of mid-ocean ridge basalt (MORB) magma at low pressures conditions including, for instance, those exposed in the Oman, Cyprus, Serbia and Turkey ophiolitic sequences (Milovanovic et al, 2012;Kocsal et al, 2017;Marien et al, 2019).…”

Section: Marco Ligi (Cnr -Ismar)mentioning

confidence: 99%

“…Also if the oceanic plagiogranites are volumetrically minor in the ophiolitic sequences, their origin has been largely debated due to importance of these rocks to understand the Earth's continental lithosphere evolution of (Marien et al, 2019). Several authors (Berndt et al, 2005) proposed that the plagiogranites are the products of fractional crystallization of mid-ocean ridge basalt (MORB) magma at low pressures conditions including, for instance, those exposed in the Oman, Cyprus, Serbia and Turkey ophiolitic sequences (Milovanovic et al, 2012;Kocsal et al, 2017;Marien et al, 2019). Others Authors (Koepke et al, 2007) have suggested an origin by partial melting (i.e.…”

Section: Marco Ligi (Cnr -Ismar)mentioning

confidence: 99%

“…The aim of this research is to characterize for the first time, with a petrological and geochemical study, the plagiogranites from the ophiolitic rocks of the North Calabria Unit of Pollino Massif and to discuss their origin and geodynamic significance. We also compare the geochemical data of these plagiogranites with those of Western Alps (Castelli and Lombardo, 2007) and Northern Apennines (Borsi et al, 1996;Montanini et al, 2006) and with further Mediterranean plagiogranites such as Turkey (Koksal et al, 2017), Cyprus (Marien et al, 2019), Serbia (Milovanovic et al, 2012 and Oman (Dylek & Furnes, 2009). The results of this work will provide new contributions and constaints about the geodynamic evolution of the Tethyan realm.…”

Section: Marco Ligi (Cnr -Ismar)mentioning

confidence: 99%

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GEOLOGY WITHOUT BORDERS - 90° Congresso della Società Geologica Italiana

Barghini¹,

Pratesi²,

Gardiol³

et al. 2021

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Miramare Castle in Trieste (Italy) with mountains in background (Photo 7915319 © Jackallxxx | Dreamstime.com).Papers, data, figures, maps and any other material published are covered by the copyright own by the Società Geologica Italiana. DISCLAIMER: The Società Geologica Italiana, the Editors are not responsible for the ideas, opinions, and contents of the papers published; the authors of each paper are responsible for the ideas opinions and contents published.La Società Geologica Italiana, i curatori scientifici non sono responsabili delle opinioni espresse e delle affermazioni pubblicate negli articoli: l'autore/i è/sono il/i solo/i responsabile/i.

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Section: Marco Ligi (Cnr -Ismar)mentioning

confidence: 99%

Section: Marco Ligi (Cnr -Ismar)mentioning

confidence: 99%

Section: Marco Ligi (Cnr -Ismar)mentioning

confidence: 99%

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GEOLOGY WITHOUT BORDERS - 90° Congresso della Società Geologica Italiana

Barghini¹,

Pratesi²,

Gardiol³

et al. 2021

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“…In addition to the B isotope analysis, the Sr isotopic composition of each textural unit was determined following the procedure described in Marien et al (2019). Approximately 200 mg aliquots of globule, andesitic groundmass and interface fragmented material were used.…”

Section: Boron and Sr Isotope Analysismentioning

confidence: 99%

“…Strontium separation was carried out using the same aliquot of digested globule, andesitic groundmass and interface aliquots. Strontium was separated from the sample matrix using the method reported by Marien et al (2019). The Sr isotope composition, and Rb and Sr contents of each aliquot were determined using a Thermo Scientific Neptune MC-ICP-MS located at University of Cologne (Germany).…”

Section: Boron and Sr Isotope Analysismentioning

confidence: 99%

Formation mechanisms of macroscopic globules in andesitic glasses from the Izu–Bonin–Mariana forearc (IODP Expedition 352)

Fonseca

Michely²,

Kirchenbaur

et al. 2020

Contrib Mineral Petrol

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The Izu–Bonin–Mariana volcanic arc is situated at a convergent plate margin where subduction initiation triggered the formation of MORB-like forearc basalts as a result of decompression melting and near-trench spreading. International Ocean Discovery Program (IODP) Expedition 352 recovered samples within the forearc basalt stratigraphy that contained unusual macroscopic globular textures hosted in andesitic glass (Unit 6, Hole 1440B). It is unclear how these andesites, which are unique in a stratigraphic sequence dominated by forearc basalts, and the globular textures therein may have formed. Here, we present detailed textural evidence, major and trace element analysis, as well as B and Sr isotope compositions, to investigate the genesis of these globular andesites. Samples consist of $$\hbox {K}_2\hbox {O}$$ K 2 O -rich basaltic globules set in a glassy groundmass of andesitic composition. Between these two textural domains a likely hydrated interface of devitrified glass occurs, which, based on textural evidence, seems to be genetically linked to the formation of the globules. The andesitic groundmass is Cl rich (ca. $$3000\, \mu \hbox {g/g}$$ 3000 μ g/g ), whereas globules and the interface are Cl poor (ca. $$300\, \mu \hbox {g/g}$$ 300 μ g/g ). Concentrations of fluid-mobile trace elements also appear to be fractionated in that globules and show enrichments in B, K, Rb, Cs, and Tl, but not in Ba and W relative to the andesitic groundmass, whereas the interface shows depletions in the latter, but is enriched in the former. Interestingly, globules and andesitic groundmass have identical Sr isotopic composition within analytical uncertainty ($$^{87}\hbox {Sr}/^{86}\hbox {Sr}$$ 87 Sr / 86 Sr of $$0.70580 \pm 10$$ 0.70580 ± 10 ), indicating that they likely formed from the same source. However, globules show high $$\delta ^{11}$$ δ 11 B (ca. + 7$$\permille$$ ‱ ), whereas their host andesites are isotopically lighter (ca. – 1 $$\permille$$ ‱ ), potentially indicating that whatever process led to their formation either introduced heavier B isotopes to the globules, or induced stable isotope fractionation of B between globules and their groundmass. Based on the bulk of the textural information and geochemical data obtained from these samples, we conclude that these andesites likely formed as a result of the assimilation of shallowly altered oceanic crust (AOC) during forearc basaltic magmatism. Assimilation likely introduced radiogenic Sr, as well as heavier B isotopes to comparatively unradiogenic and low $$\delta ^{11}\hbox {B}$$ δ 11 B forearc basalt parental magmas (average $$^{87}\hbox {Sr}/^{86}\hbox {Sr}$$ 87 Sr / 86 Sr of 0.703284). Moreover, the globular textures are consistent with their formation being the result of fluid-melt immiscibility that was potentially induced by the rapid release of water from assimilated AOC whose escape likely formed the interface. If the globular textures present in these samples are indeed the result of fluid-melt immiscibility, then this process led to significant trace element and stable isotope fractionation. The textures and chemical compositions of the globules highlight the need for future experimental studies aimed at investigating the exsolution process with respect to potential trace element and isotopic fractionation in arc magmas that have perhaps not been previously considered.

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