Melt impregnation phases in the mantle section of the Ślęża ophiolite (SW Poland)

Wojtulek, Piotr; Puziewicz, Jacek; Ntaflos, Theodoros

doi:10.1016/j.chemer.2016.03.004

Cited by 7 publications

(9 citation statements)

References 33 publications

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“…In this regard, all clinopyroxenes differ from residual abyssal peridotite clinopyroxenes (Seyler et al, 2003) except for two samples in augite composition (Figure 6e). Moreover, the Al 2 O 3 and Cr 2 O 3 contents of most clinopyroxenes in the clinopyroxenite show close distribution with secondary clinopyroxene (compared with Nozaka (2005), Seyler et al (2007), and Wojtulek et al (2016)). However, the harzburgitic clinopyroxenes exhibit modified characters ( Figure 6e).…”

Section: Clinopyroxenementioning

confidence: 84%

“…Conversely, two clinopyroxene samples with high Al 2 O 3 contents showed abyssal character, indicative of residual clinopyroxene in the clinopyroxenites. Overall, clinopyroxenes from the clinopyroxenites with lower Cr 2 O 3 and Al 2 O 3 content than modified clinopyroxenes in the host harzburgites displayed secondary clinopyroxene characteristics, as suggested by Nozaka (2005) and Wojtulek et al (2016); see Figure 6e.…”

Section: Origin Of the Clinopyroxenite Dykesmentioning

confidence: 91%

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Mineral records of the pyroxenites formed within harzburgites (Ulaş, Sivas, Turkey): implications on petrogenesis and tectonic setting

Bilici¹,

Kolayli²

2018

Turkish J Earth Sci

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In this article, the petrological processes of the clinopyroxenite dykes and host peridotites occurring in Ulaş District (Sivas, mid-Anatolia, Turkey) are discussed. The new geochemical data from major minerals in the clinopyroxenite dykes and host harzburgites revealed differences to the supra-subduction zone (SSZ)-type pyroxenites and peridotites. In particular, the NiO content of olivines in the host harzburgites showed the signature of the mantle, whereas rare olivines of the clinopyroxenites had a NiO content and Fo number that were inferior to those of mantle peridotites. The high Mg-number of clinopyroxenes in the clinopyroxenites was likely associated with the partial remelting of the host harzburgites. Additionally, the rare earth element pattern of clinopyroxenes from the studied clinopyroxenites exhibited a similar pattern to those of the other SSZ or fore-arc clinopyroxenes. Additionally, the low Mgnumber and relatively high Cr-number of spinels in the clinopyroxenites showed similarity to the subduction-related origin. Based on textural and geochemical evidence, the harzburgites were interpreted as depleted mantle rock, which was modified by melt-peridotite interactions. Consequently, the pyroxenites likely occurred as a crystallizing or cumulative zone of the SSZ-type melt and the minerals were gained from partial melting of the harzburgites through the interaction with such magma.

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Section: Clinopyroxenementioning

confidence: 84%

Section: Origin Of the Clinopyroxenite Dykesmentioning

confidence: 91%

Mineral records of the pyroxenites formed within harzburgites (Ulaş, Sivas, Turkey): implications on petrogenesis and tectonic setting

Bilici¹,

Kolayli²

2018

Turkish J Earth Sci

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“…The style of serpentinization in the BBM is similar to that in other serpentinite massifs belonging to the Central-Sudetic Ophiolites: the Gogołów-Jordanów and Szklary. They also recorded at least two steps of alteration: pseudomorphic and non-pseudomorphic ones (Dubińska and Gunia 1997;Wojtulek et al 2016b).…”

Section: Western Part Of the Braszowice-brzeźnica Massifmentioning

confidence: 99%

“…For example, serpentinites from the Lanzo Massif in Western Alps contain similar mineral succession represented by lizardite -antigorite -secondary olivine associated with chlorite or secondary clinopyroxene, amphibole and chlorite (Debret et al 2013 (Godard et al 2000), ophiolitic lherzolites (Bodinier 1988) and serpentinites from the Gogołów-Jordanów serpentinite Massif (Wojtulek et al 2016b) are added for comparison.…”

Section: Western Part Of the Braszowice-brzeźnica Massifmentioning

confidence: 99%

“…The former was analysed at the Kraków Research Centre, Institute of Geological Sciences, Polish Academy of Sciences. For details of analytical procedure see Wojtulek et al (2016b). The latter was analysed at the Institute of Geology of the Czech Academy of Science in Prague using an Element 2 ICP-MS coupled with an UP-213 213-nm NdYAG laser ablation system.…”

Section: Petrography and Mineral Chemistrymentioning

confidence: 99%

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MORB melt metasomatism and deserpentinization in the peridotitic member of Variscan ophiolite: an example of the Braszowice–Brzeźnica serpentinites (SW Poland)

Wojtulek¹,

Puziewicz²,

Ntaflos³

2017

J. Geosci.

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The Variscan Braszowice-Brzeźnica Massif (SW Poland) consists of gabbros and serpentinized peridotites with gabbro veins. Antigorite serpentinites form the western part of the Massif, whereas tremolite peridotites, tremolite serpentinites and lizardite-chrysotile serpentinites are found at the contact with granite intrusion in the east. Sparse relics of clinopyroxene, olivine and chromite were studied within the antigorite serpentinites. Clinopyroxene I The serpentinites of the Braszowice-Brzeźnica Massif were formed supposedly immediately below the paleo-Moho in the ocean-spreading setting. Chemistry of clinopyroxene I from antigorite serpentinites resembles, in terms of major elements and REE, clinopyroxenes that originate due to MORB-like melt percolation through abyssal peridotites. The coexisting olivine I with both chromite I and II supposedly shared a similar origin. Composition of chromite suggests the back-arc setting of the Braszowice-Brzeźnica Massif. Clinopyroxene II and olivine II have major-element compositions indicative of metamorphic origin at expense of serpentine ± magnetite (deserpentinization). The deserpentinization assemblage occurring in serpentinites (antigorite-olivine-clinopyroxene) was formed probably under low-grade metamorphic conditions. The tremolite-bearing rocks record the thermal metamorphism by granite intrusion. Braszowice-Brzeźnica Massif, Bohemian Massif Received: 4 December 2016; accepted: 21 June 2017; handling editor: E. Jelínek constitute group of gabbroic and serpentinitic outcrops, with subordinate metabasalts (Kryza and Pin 2010). The geochemical affinity of the Central-Sudetic ophiolites has been relatively well studied. The Ślęża Ophiolite, which is the most complete ophiolitic sequence in the region, was considered to having originated in the mid-ocean ridge or back-arc setting (Pin et al. 1988).The peridotite members of the Central-Sudetic ophiolites are heavily serpentinized, nevertheless they contain non-serpentine phases which record information about ocean rift processes and later metamorphism (Wojtulek et al. 2016a, b, and references therein). Keywords: Variscan ophiolite, peridotitic member, MORB melt percolation, clinopyroxene,In this paper we describe the non-serpentine phases occurring in highly serpentinized ultramafic rocks from the Braszowice-Brzeźnica Massif, a small ophiolite slice belonging to the Central-Sudetic ophiolites. We show that some of these minerals originated due to melt percolation in the uppermost part of the mantle, probably close to the paleo-Moho. We also show that part of the

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The Central-Sudetic ophiolites – Remnants of the SSZ-type Devonian oceanic lithosphere in the European part of the Variscan Orogen

et al. 2022

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Melt impregnation phases in the mantle section of the Ślęża ophiolite (SW Poland)

Cited by 7 publications

References 33 publications

Mineral records of the pyroxenites formed within harzburgites (Ulaş, Sivas, Turkey): implications on petrogenesis and tectonic setting

Mineral records of the pyroxenites formed within harzburgites (Ulaş, Sivas, Turkey): implications on petrogenesis and tectonic setting

MORB melt metasomatism and deserpentinization in the peridotitic member of Variscan ophiolite: an example of the Braszowice–Brzeźnica serpentinites (SW Poland)

The Central-Sudetic ophiolites – Remnants of the SSZ-type Devonian oceanic lithosphere in the European part of the Variscan Orogen

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