The Jurassic South Albanian ophiolites: MOR- vs. SSZ-type ophiolites

Hoeck, Volker; Koller, Friedrich; Meisel, Thomas; Onuzi, Kujtim; Kneringer, E.

doi:10.1016/s0024-4937(02)00163-9

Cited by 87 publications

(64 citation statements)

References 15 publications

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“…The ophiolites of the eastern belt are of Early to Middle Jurassic age (Fig. 4) and show supra-subduction zone (SSZ) and mid-ocean ridge (MOR) affinities in accordance to the model of Bébien et al (1998) and Hoeck et al (2002). They consist mainly of lherzolites and gabbros; interlayered pyroxenitic dykes and minor harzburgites and serpentinites (Hoeck et al, 2002;Kocks et al, 2007) have been described as well.…”

Section: Mirdita Zonesupporting

confidence: 69%

Evolution of ancient Lake Ohrid: a tectonic perspective

et al. 2010

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Abstract. Lake Ohrid Basin is a graben structure situated in the Dinarides at the border of the Former Yugoslavian Republic of Macedonia (FYROM) and Albania. It hosts one of the oldest lakes in Europe and is characterized by a basin and range-like geological setting together with the halfgraben basins of Korca, Erseka and Debar. The basin is surrounded by Paleozoic metamorphics in the northeast and north and Mesozoic ultramafic, carbonatic and magmatic rocks in the east, northwest, west and south. Paleocene to Pliocene units are present in the southwest. With the basin development,

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Section: Mirdita Zonesupporting

confidence: 69%

Evolution of ancient Lake Ohrid: a tectonic perspective

et al. 2010

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“…Composite blocks of tholeiitic extrusives suggest that the high-Ti and medium-Ti magmatism may be temporally and spatially closely interrelated. Similar overlaping of contrasting magma types seems to be very common in Neotethyan ophiolites as exemplared by the Mirdita ophiolites in Albania (Bébien et al 2000;Hoeck et al 2002;Bortolotti et al 2002;Dilek et al 2007). …”

Section: Tectonomagmatic Significance Of Tholeiitic Basaltsmentioning

confidence: 71%

Geochemistry, petrology and tectonomagmatic significance of basaltic rocks from the ophiolite mélange at the NW External-Internal Dinarides junction (Croatia)

Slovenec¹,

Lugović²,

Vlahović³

2010

Geologica Carpathica

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Abstract:At the NW inflexion of the Sava-Vardar Suture Zone ophiolite mélanges, known as the Kalnik Unit, form the surface of the slopes of several Pannonian inselbergs in the SW Zagorje-Mid-Transdanubian Zone. The Mt Samoborska Gora ophiolite mélange, thought to be a part of the Kalnik Unit, forms a separate sector obducted directly onto Dinaric Triassic carbonate sediments. Basaltic rocks, the only magmatic rocks incorporated in the mélange, include MiddleTriassic (Illyrian-Fassanian) alkali within-plate basalts and Middle Jurassic (uppermost Bathonian-Lower Callovian) tholeiitic basalts. The latter sporadically constitute composite olistoliths, and are geochemically divided into N-MORBlike (high-Ti basalts) and transitional MORB/IAT (medium-Ti basalts). These geochemically different rocks suggest crystallization at various tectonomagmatic settings, which is also indicated by the rock paragenesis and host clinopyroxene compositions. Alkali basalts reflect melts derived from an OIB-type enriched mantle source [Ti/V= 62.2-82.4; (La/Lu) cn = 6.4-12.8] with Nd-Sr isotope signatures close resembling the Bulk Earth [ε Nd(T=235 Ma) = + 1.6 to + 2.5]. They are recognized as preophiolite continental rift basin volcanic rocks that closely predate the opening of the Repno oceanic domain (ROD) of the Meliata-Maliac ocean system. The high-Ti and medium-Ti basalts from composite blocks derived from a similar depleted mantle source (ε Nd(T=165 Ma) =+ 6.01 vs. + 6.35) succesively metasomatized by expulsion of fluids from a subducting slab leading to a more pronounced subduction signature in the latter [Ti/V= 31.6-44.8 and (Nb/La) n = 0.67-0.90 vs. Ti/ V= 21.5-33.9 and (Nb/La) n = 0.32-0.49]. These composite blocks indicate crust formation in an extensional basin spreading over the still active subducting ridge. The majority of high-Ti basalts may represent the fragments of older crust formed at a spreading ridge and incorporated in the mélange of the accretionary wedge formed in the proto-arc-fore-arc region. The Mt Samoborska Gora ophiolite mélange represents the trailing edge of the Kalnik Unit as a discrete sector that records the shortest stage of tectonomagmatic evolution related to intraoceanic subduction in the ROD.

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“…A particular Fe -Ti mineralization, related to Fe-gabbro, is also present. For this belt is characteristic the crystallization order: olivine+chromite+plagioclase+clinopyroxene and geochemical features of association high-Ti basalts, that an oceanic spreading system without any influence of subdacted related processes Shallo et al, 1995;Hoeck et al, 2002). The western ophiolite belt is originated from magmatic source that was less depleted, 5-10% (Koller et al, 2009;.…”

Section: Introductionmentioning

confidence: 99%