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Metamorphic evolution of the Karakaya Complex in northern Turkey based on phyllosilicate mineralogy
Date
2015-04-01
Author
TETİKER, SEMA
YALÇIN, HÜSEYİN
BOZKAYA, ÖMER
Göncüoğlu, Mehmet Cemal
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Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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The Triassic Karakaya Complex (KC) of the Sakarya Composite Terrane in northern Turkey is traditionally subdivided into two units. The Lower Karakaya Complex (LKC) consists of a tectonic m,lange with blocks of metabasic rocks, metacarbonates, meta-arenites and metapelites that have been affected by high pressure/low temperature metamorphism. It is followed by a low pressure/low temperature metamorphic overprint; the latter is the only metamorphic event in some tectonic slivers of the LKC. The Upper Karakaya Complex (UKC) units are primarily composed of diagenetic to low-grade metamorphic rocks, comprising Late Permian and Triassic cherts and blocks of OIB-type volcanic rocks interfingering with Anisian limestones. LKC slide-blocks of variable sizes are frequently observed within the UKC. Phyllosilicates of LKC and UKC were examined for their abundance, crystallinity, polytype and b cell dimension. Trioctahedral chamositic chlorites have IIb polytype and phengites 2 M (1) polytypes in the LKC units and 2 M (1) + 1 M + 1M (d) polytypes of phengitic dioctahedral illites in the UKC units. Kubler index data correspond to the low anchizone and epizone for the LKC units, and to the high diagenesis-low anchizone, and in part to the epizone for the UKC units. The b values of illites are consistent with a high-pressure facies series for the LKC, but only intermediate-pressure facies for the UKC. According to textural features, mineral paragenesis, clay transformations, index minerals, and b values, the lower-middle parts of the LKC represent an accretional tectonic setting, whereas the UKC units reflect pressure temperature conditions of an extensional basin affected by high heat flow.
Subject Keywords
Low-grade metamorphism
,
X-ray-diffraction
,
Aipea nomenclature committee
,
Radiolarian cherts
,
Northwest Turkey
,
Clay-minerals
,
Antalya unit
,
Muscovite
,
Anatolia
,
Chlorite
URI
https://hdl.handle.net/11511/32429
Journal
MINERALOGY AND PETROLOGY
DOI
https://doi.org/10.1007/s00710-014-0364-0
Collections
Graduate School of Natural and Applied Sciences, Article
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S. TETİKER, H. YALÇIN, Ö. BOZKAYA, and M. C. Göncüoğlu, “Metamorphic evolution of the Karakaya Complex in northern Turkey based on phyllosilicate mineralogy,”
MINERALOGY AND PETROLOGY
, pp. 201–215, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/32429.