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Permo–triassic and Liassic tethyan Oceanic tracts within the Pontide Belt Along the Southern Margin of Eurasia, Northern Anatolia

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Acta Geologica Sinica(English Edition) 2017年第S1期91卷 33-34页

作者： E.SARIFAKIOGLU Y.DILEK M.SEVIN S.PEHLIVAN O.K EMIR A.MOLLER t.bayanova I.UYSAL M.KELES General Directorate of Mineral Research & Explor Department of Geology & Env.Earth Science Miami University the University of Kansas Department of Geology Geol.Inst.of the Kola Science Centre of the RAS Dept.of Geol.Engineering Karadeniz Technical University Makro Yet.Madencilik

the Pontide belt in northern turkey includes three major tectonic terranes,the Strandja Massif（Sj M）,and the Istanbul（ISZ）and Sakarya Zones（SZ）(Fig.1).We present new age and geochemical data from ophiolites and ophiolitic mélanges within the Sakarya Zone and show that these mafic–ultramafic rocks are the remnants of tethyan oceanic lithosphere formed in different tectonic *** main ophiolite occurrences investigated in this study along the Karakaya Suture（KS）are associated with the latest triassic Cimmeride orogeny,and in the Küre–Yusufeli ophiolite belt are part of the Alpide *** Karakaya Suture Zone ophiolites in northern west turkey are comprised mainly of the Denizgoren（?anakkale）ophiolite,Bo?azk?y（Bursa）,Geyve（Sakarya）,Almac?k（Düzce）and?ele（Bolu）*** Denizg?ren ophiolite largely contains upper mantle peridotites,which are equivalents of the Permo–triassic Lesvos peridotites and mélange units farther SW in the northern Aegean *** Bo?azk?y ophiolite includes serpentinite and metagabbro,and the Almac?k and Geyve ophiolites display an almost complete Penrose–type sequence consisting of serpentinizeduppermantleperidotites,cumulate ultramafic–mafic rocks,isotropic gabbros,dolerite and plagiogranite dikes,and extrusive rocks.U–Pb zircon dating of plagiogranite dikes from?ele has revealed an igneous age of 260 Ma,and 255,235,227 Ma from Almac?k（Bozkurt et al.,2012a,b）.Consistent with the previouslypublished Permo–triassic age,we obtained a 268.4±6.3 Ma U–Pb zircon age from a plagiogranite dike within the Almacik ophiolite to the *** KS ophiolite belt containing the?ele,Almac?k,Geyve ophiolites within the SZ extends westward into the Armutlu Peninsula and then into the Biga Peninsula（***?ren ophiolite）and most likely connects with the remnants of the triassic Meliata–Meliac ocean basin（Stampfli and Borel,2002）in the Balkan *** KS ophiolites also continue eastward within the Pontide Belt into the Elekda?ophiolite（e

关键词： triassic and Liassic tethyan Oceanic tracts within the Pontide Belt Along the Southern Margin of Eurasia rock KS Pb Permo Northern Anatolia

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New U-Pb and Sm-Nd Data and REE Distribution in Sulphides of Paleoproterozoic PGE Layered Intrusions in the Arctic Part of the Fennoscandian Shield

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Open Journal of Geology 2019年第11期9卷 768-782页

作者： tamara bayanova Irina Elizarova Pavel Serov Nadezhda Ekimova Evgeny Kunakkuzin Ekaterina Steshenko Yury Neradovsky Markku Iljina Dmitry Zhirov Geological Institute of the Kola Science Centre Russian Academy of Sciences Apatity Russia Institute of the North Industrial Environmental Problems of the Kola Science Centre Russian Academy of Sciences Apatity Russia Geological Survey of Finland Rovaniemi Finland

the U-Pb (on zircon) and Sm-Nd analysis is a popular isotope-geochronological tool for estimating the age of rocks from PGE mafic-ultramafic intrusions. Sulphides can be used to study the geochronology of ore processes as well, since they should indicate the time of ore mineralization. Gabbronorite has been sampled from the Passivaara reef at the Penikat layered intrusion (Finland) for U-Pb and Sm-Nd isotope single zircon analyses in order to separate sulphide minerals. the Sm-Nd isotope age of gabbronorite has been dated at 2426 ± 36 Ma;eNd(t) = −1.4 ± 0.4. the Sm-Nd isotope age on sulphides and rock-forming minerals reflects the crystallization time of the ore-bearing gabbronorite from the Passivaara reef of the Penikat layered intrusion. the mass-spectrometer analytical environment and modes of operation have been adjusted to detect REE in sulphide minerals on example of pyrite from the PGE Penikat layered intrusion (Finland) and chalcopyrite from the talnakh deposit (Norilsk area, Russia) has been estimated. the total REE content in pyrite is ca. 3.5 ppm, which is enough to define the Sm-Nd age of pyrite. the study shows how to use the mineral/chondrite spectra to evaluate the accuracy of the REE analytical results on example of State Standard Sample 2463 (Russia).

关键词： Platinum Group Elements Layered Intrusion Rare Earth Elements Uranium-Lead and Samarium-Neodymium Analyses Zircon Sulphide Minerals Fennoscandian Shield

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