Early Cambrian S-type granites in the Sakarya Zone, NE Turkey: A record for transition from subduction to post-collisional extension deduced from U-Pb zircon age and Nd-Hf isotopes

被引:10
作者
Karsli, Orhan [1 ]
Sengun, Firat [2 ]
Dokuz, Abdurrahman [3 ]
Aydin, Faruk [1 ]
Kandemir, Raif [4 ]
Kristoffersen, Magnus [5 ]
Santos, Jose Francisco [6 ]
Hofmann, Mandy [7 ]
Duygu, Levent [8 ]
机构
[1] Karadeniz Tech Univ, Dept Geol Engn, TR-61080 Trabzon, Turkey
[2] Canakkale Onsekiz Mart Univ, Dept Min & Mineral Extract, Can Vocat Coll, TR-17400 Canakkale, Turkey
[3] Gumushane Univ, Dept Geol Engn, TR-29100 Gumushane, Turkey
[4] Recep Tayyip Erdogan Univ, Dept Geol Engn, TR-53100 Rize, Turkey
[5] Univ Oslo, Dept Geosci, POB 1047, N-0316 Oslo, Norway
[6] Univ Aveiro, Dept Geociencias, Geobiotec, P-3810193 Aveiro, Portugal
[7] Museum Mineral & Geol, Senckenberg Nat Hist Sammlungen Dresden, Dresden, Germany
[8] Gen Directorate Mineral Res & Explorat, TR-06530 Ankara, Turkey
关键词
Tornquist Ocean; Early Cambrian; Metagreywacke; S-type granite; Sakarya Zone; Yusufeli area; NE Turkey; PERI-GONDWANAN TERRANES; GEOCHEMICAL CONSTRAINTS; TRACE-ELEMENT; RHEIC OCEAN; MELT EXTRACTION; MAGMATISM; EVOLUTION; ORIGIN; AREA; PONTIDES;
D O I
10.1016/j.lithos.2022.106809
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Cadomian realms have recently received much attention in the Alpine-Mediterranean orogenic belts, with discontinuous outcrops extending from the Alps to the Istanbul Zone, Menderes Massif, Taurides in Turkey and Iran as well. However, they have not been identified in the Sakarya Zone, northern Turkey to date. Here, we present, for the first time, zircon U-Pb geochronology, zircon Hf-isotopes and trace elements as well as whole-rock geochemistry and Nd-isotopes from the Karamese metagranitoid in the Yusufeli (Artvin) area, NE Turkey. The zircon U-Pb age data demonstrate that the Karamese metagranitoid intruded into the Precambrian basement units in the Early Cambrian (ca. 534-530 Ma). Zircon overgrowths in the Karamese metagranitoid interpreted as a result of metamorphic overprint yielded ages of 328 Ma. This age indicates that the Sakarya Zone experienced the Variscan metamorphic events at 328 Ma. The Early Cambrian metagranitoid shows that some rocks in the basement of the Sakarya Zone date back to Precambrian in age. The Karamese metagranitoid is an S-type granite, with high modal content of muscovite (similar to 10%). The samples show highly peraluminous [A/CNK = molar Al2O3/(CaO + K2O + Na2O) = 1.34-1.58] and medium-K calc-alkaline geochemical affinities. The Karamese metagranitoid displays low REE concentrations and a slight positive Eu anomaly and show slightly light REEs and LILEs enrichments, and HFSEs depletions. The samples have negative epsilon(Nd)(t) of -4.76 to -2.90 and epsilon(Hf) (t) of -4.75 to -1.08 values. These geochemical-isotopic characteristics reveal that the Karamase metagranitoid originated through fluid-absent muscovite dehydration melting of heterogeneous metasedimentary source rocks (mostly greywacke), with a minor input of juvenile mafic melt. We argue that the Early Paleozoic metagranitoids along the eastern Sakarya Zone is an expression of crustal thinning in the Cadomian orogenic belt in northern Gondwana, with the tectonic turnover from convergent margin to crustal extension possibly induced by break-off of Tornquist oceanic lithosphere which is a branch of Iapetus Ocean during Early Cambrian.
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