Late Precambrian Balkan-Carpathian ophiolite — a slice of the Pan-African ocean crust?: geochemical and tectonic insights from the Tcherni Vrah and Deli Jovan massifs, Bulgaria and Serbia

Savov, Ivan P.; Ryan, Jeffrey G.; Haydoutov, Ivan; Schijf, Johan

doi:10.1016/s0377-0273(01)00216-5

Cited by 38 publications

(11 citation statements)

References 29 publications

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“…The basement of the _ Istanbul terrane is exposed in the Bolu Massif, whereas basement units of the Zonguldak terrane crop out in small inliers further east in the Quésada 1990, Abramovitz et al 1999, Guterch et al 1999, Miller et al 1999, Unrug et al 1999, Chantraine et al 2001, Savov et al 2001, Bandres et al 2002, Chen et al 2002, Dörr et al 2002, Gubanov 2002, Linnemann and Romer (2002, Murphy et al 2002, Neubauer 2002, Pin et al 2002, Romano et al 2004, Gürsu and Göncüoglu 2005, Okay et al 2008Ustaömer et al 2005Ustaömer et al , 2009. GTZ Gavrovo-Tripolitza-Ionian Zone, P Pindos Zone, VA Vardar-Axios Zone.…”

Section: Stratigraphy Of the _ Istanbul Terranementioning

confidence: 99%

Detrital zircon ages from a Lower Ordovician quartzite of the İstanbul exotic terrane (NW Turkey): evidence for Amazonian affinity

Ustaömer

Gerdes

Zulauf

2009

Int J Earth Sci (Geol Rundsch)

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NW Turkey is a mosaic of several continental and oceanic units, that were amalgamated by collisional and strike-slip tectonics. One of the continental units is the _ Istanbul terrane, the Palaeozoic strata of which comprise an Early Ordovician to Early Carboniferous transgressive sedimentary sequence. The basement to the Palaeozoic succession is exposed in the Bolu Massif and is represented by a thick meta-volcanic unit intruded by Late Neoproterozoic (ca. 575 Ma) felsic magma. This meta-igneous basement is considered to be a sliver of the Cadomian magmatic arc. Unconformably overlying Early Ordovician strata start with red fluvial clastics (ca. 3,000 m), overlain by shallow marine quartzites (\250 m). Detrital zircons were separated from an Ordovician quartzite sample located 5 m above the contact with the underlying red fluvial clastics. We have dated a total of 99 zircon grains by U-Pb method using laser ablation-sector field-inductively coupled plasma mass spectrometer (LA-SF-ICP-MS). The ages (97% are [90% concordant) range from 530 to 2550 Ma. The dominance (44 grains) of Neoproterozoic zircon ages (around 540, 570, 600-640 and 700-800 Ma) rules out any link of the _ Istanbul terrane with Baltica. The large amount (40 grains) of Grenvillian and Meso-to Palaeo-proterozoic ages (around 1.0-1.2, 1.3-1.6, 1.7-1.8, and 1.9-2.1 Ga) in the zircon population further rules out a link to Cadomian and Minoan terranes, but is indicative for Amazonian source areas. The new age data suggest the _ Istanbul terrane to be a peri-Gondwanan terrane that was located at the northwestern margin of Gondwana close to Amazonia. This terrane should have travelled a large distance in the Phanerozoic times.

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Section: Stratigraphy Of the _ Istanbul Terranementioning

confidence: 99%

Detrital zircon ages from a Lower Ordovician quartzite of the İstanbul exotic terrane (NW Turkey): evidence for Amazonian affinity

Ustaömer

Gerdes

Zulauf

2009

Int J Earth Sci (Geol Rundsch)

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“…Major and some trace element (Cr, Ni, V, Co, Sc, Zn, Cu, Sr, Ba, Mn) abundances were analyzed at the University of South Florida by direct current plasma‐atomic emission spectrometry (DCP‐AES) following HF‐HClO 4 acid digestions, or following LiBO 2 fluxed‐fusion digestions. LiBO 2 fluxed‐fusion digestion techniques follow those described by Savov et al [2001] in that furnace temperatures were maintained at 1125°C to encourage complete digestion of ultramafic samples. HF‐HClO 4 methods for major and trace element analysis followed our procedures for Li determinations (see below), save that as a final step, an aliquot of the sample solution was diluted 1:1 with a 2000 ppm Li solution (made with ultra‐pure Li 2 CO 3 ), to negate matrix effect problems which can occur during DCP‐AES analysis.…”

Section: Sample Selection and Analytical Methodsmentioning

confidence: 99%

Geochemistry of serpentinized peridotites from the Mariana Forearc Conical Seamount, ODP Leg 125: Implications for the elemental recycling at subduction zones

Savov¹,

Ryan²,

D’Antonio³

et al. 2005

Geochem Geophys Geosyst

203

174

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[1] Recent examinations of the chemical fluxes through convergent plate margins suggest the existence of significant mass imbalances for many key species: only 20-30% of the to-the-trench inventory of large-ion lithophile elements (LILE) can be accounted for by the magmatic outputs of volcanic arcs. Active serpentinite mud volcanism in the shallow forearc region of the Mariana convergent margin presents a unique opportunity to study a new outflux: the products of shallow-level exchanges between the upper mantle and slab-derived fluids. ODP Leg 125 recovered serpentinized harzburgites and dunites from three sites on the crests and flanks of the active Conical Seamount. These serpentinites have U-shaped rare earth element (REE) patterns, resembling those of boninites. U, Th, and the high field strength elements (HFSE) are highly depleted and vary in concentration by up to 2 orders of magnitude. The low U contents and positive Eu anomalies indicate that fluids from the subducting Pacific slab were probably reducing in nature. On the basis of substantial enrichments of fluid-mobile elements in serpentinized peridotites, we calculated very large slab inventory depletions of B (79%), Cs (32%), Li (18%), As (17%), and Sb (12%). Such highly enriched serpentinized peridotites dragged down to depths of arc magma generation may represent an unexplored reservoir that could help balance the input-output deficit of these elements as observed by Plank and Langmuir (1993, 1998) and others. Surprisingly, many species thought to be mobile in fluids, such as U, Ba, Rb, and to a lesser extent Sr and Pb, are not enriched in the rocks relative to the depleted mantle peridotites, and we estimate that only 1-2% of these elements leave the subducting slabs at depths of 10 to 40 km. Enrichments of these elements in volcanic front and behind-the-front arc lavas point to changes in slab fluid composition at greater depths.

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“…In addition to the various crystalline belts of the Arabian-Nubian Shield, numerous other Pan-African Neoproterozoic belts that occurred across Gondwana do form crustal segments that are currently widely scattered over several regions. Examples of such segments include those located in western India (de Wall et al 2012), Sri Lanka (Dissanayake & Chandrajith, 1999), the Seychelles (Ashwal, Demaiffe & Torsvik, 2002), Australia (Dalziel, 1991;Veevers, 2003Veevers, , 2004, East Antarctica (Jacobs et al 1998), Madagascar , the crudely Ushaped belt that girdles Africa as the Arabian-Nubian Shield and the Mozambique belt (Abdel-Rahman, 1995;Meert & Lieberman, 2008), along with other crustal segments in eastern Brazil ( Silva et al 2005a ;Silva, McNaughton & Fletcher, 2005b), in the Avalon 'suspect' terrains of Newfoundland / Nova Scotia (Krogh et al 1988;Keppie & Dostal, 1991) and in the Balkans (Haydoutov & Yanev, 1997;Savov et al 2001).…”

Section: D From Fragmented Rodinia To United Plates Of Gondwana: Rmentioning

confidence: 99%

Geochemistry, age and origin of the Mons Claudianus TTG batholith (Egypt): insight into the role of Pan-African magmatism in uniting plates of Gondwana

Abdel‐Rahman

2018

Geol. Mag.

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The tonalite–trondhjemite–granodiorite (TTG) Mons Claudianus Batholith (MCB) of Egypt is subsolvus, metaluminous to mildly peraluminous, exhibits wide ranges of SiO2, Al2O3, Sr, Rb, Zr, shows large Ba enrichment, is moderately enriched in rare earth elements (REE) and is depleted in K, Ti, Nb, Y, Hf and heavy REE (HREE), reflecting strong arc geochemical signatures. Moderate fractionation of REE and lack of Eu anomaly characterize the MCB. It is typical of high-Al TTGs of volcanic-arc affinities. U–Pb–zircon dating produced a Pan-African age of 664.12 ± 0.38 Ma. The MCB exhibits 87Sr/86Sr isotopic compositions of 0.70352–0.70626 (initial Sr ratio of 0.70259) and 143Nd/144Nd ratios of 0.51261–0.51276 (εNd; –0.5 to +2.4), suggestive of a mantle source. Anatexis of a basaltic slab under eclogitic conditions leaving garnet in the residue produces high-Al TTG rocks characterized by low Yb values (<1.8 ppm). Values (in ppm) of Yb (0.65–1.8), Y (2.2–19), Nb (1.2–6.4), and ratios of Nb/Ta (7–17), (La/Yb)N of 11.7, Sr/Y and Zr/Sm (58 and 45, respectively) are all consistent with anatexis of a basaltic slab under eclogitic conditions, leaving garnet in the residue to produce this high-Al TTG suite. The data conform to magma generation via partial melting (F = 0.25–0.50) leaving 15–25 % garnet in the residue. Voluminous synorogenic magmatic pulses, resulting from slab melting during the closure of the Mozambique Ocean via convergence of east and west Gondwana, produced the MCB and similar large batholiths forming the core of Pan-African belts. These belts welded together vestiges of fragmented Rodinia, assembling them into a united Gondwana.

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Late Precambrian Balkan-Carpathian ophiolite — a slice of the Pan-African ocean crust?: geochemical and tectonic insights from the Tcherni Vrah and Deli Jovan massifs, Bulgaria and Serbia

Cited by 38 publications

References 29 publications

Detrital zircon ages from a Lower Ordovician quartzite of the İstanbul exotic terrane (NW Turkey): evidence for Amazonian affinity

Detrital zircon ages from a Lower Ordovician quartzite of the İstanbul exotic terrane (NW Turkey): evidence for Amazonian affinity

Geochemistry of serpentinized peridotites from the Mariana Forearc Conical Seamount, ODP Leg 125: Implications for the elemental recycling at subduction zones

Geochemistry, age and origin of the Mons Claudianus TTG batholith (Egypt): insight into the role of Pan-African magmatism in uniting plates of Gondwana

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