| Petrographic and Geochemicial Characteristics of the K?z?loren Formation (Upper Triassic-Lower Jurassic) in the Akp?nar (Konya, Turkey) Area |
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| 引用本文： | Ali Müjdat ?ZKAN,and Ay?e ELMAS.Petrographic and Geochemicial Characteristics of the K?z?loren Formation (Upper Triassic-Lower Jurassic) in the Akp?nar (Konya, Turkey) Area[J].Acta Geologica Sinica,2012,86(6):1455-1470. |
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| 作者姓名： | Ali Müjdat ?ZKAN and Ay?e ELMAS |
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| 作者单位： | 1 Department of Geological Engineering, Selcuk University, 42079 Konya, Turkey .2 Graduate School of Natural and Applied Sciences, Selcuk University, Konya, Turkey |
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| 基金项目： | Support from the Graduate School of Natural and Applied Sciences of Selcuk University is gratefully acknowledged. The authors cordially thank Assistant Professor Dr Suayip Kupeli (Selcuk University) for REE data analyses. |
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| 摘 要： | This paper describes the occurrence of dolomite and the mechanism of dolomitization of the Upper Triassic-Lower Jurassic K?z?loren Formation in the autochthonous Bolkardag? unit of the middle Taurus Mountains in south western Turkey. Dolomites were analyzed for geochemical, isotopic and crystallographic variation. Dolomites occur as a replacement of precursor carbonate and cement. The dolomite crystals range from <10 to ~1000 μm existing as both replacements and cements. Sr concentrations range between 84 and 156 ppm, and the molar Sr/Ca ratios of dolomitizing fluids are estimated to range between 0.0066 to 0.013 ratios. Dolomites are Ca-rich (with average CaCO3 and MgCO3 equal to 56.43 and 43.57 mol%, respectively) and they are non-stoichiometric, with an average Sr=116 ppm, Na=286 ppm, Mn=81 ppm, Fe=1329 ppm, and δ18O and δ13C ranges from –0.6‰ to –6.1‰ Pee Dee Belemnite PDB], and +1.2 to +3.9‰ PDB. The North American Shale Composition NASC]-normalized rare earth element (REE) values of the both limestone and dolomite sample groups show very similar REE patterns characterized by small positive Eu (mean=1.32 and mean=1.42, respectively) and slightly or considerably negative Ce (mean=0.61 and mean=0.72, respectively) anomalies and a clear depletion in all REE species. The K?z?loren Formation dolomites have been formed as early diagenetic from mixing zone fluids at the tidal-subtidal environment and at the late diagenetic from basinal brines at the shallow-deep burial depths.
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| 关 键 词： | dolomite K?z?loren Akp?nar peritidal petrography geochemistry |
| 收稿时间： | 9/9/2011 12:00:00 AM |
| 修稿时间： | 2012/3/10 0:00:00 |
Petrographic and Geochemicial Characteristics of the Kızıloren Formation (Upper Triassic‐Lower Jurassic) in the Akpınar (Konya,Turkey) Area |
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| Authors: | Ali Müjdat
ZKAN Aye ELMAS |
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| Abstract: | This paper describes the occurrence of dolomite and the mechanism of dolomitization of the Upper Triassic‐Lower Jurassic K?z?loren Formation in the autochthonous Bolkardag? unit of the middle Taurus Mountains in south western Turkey. Dolomites were analyzed for geochemical, isotopic and crystallographic variation. Dolomites occur as a replacement of precursor carbonate and cement. The dolomite crystals range from <10 to ～1000 μm existing as both replacements and cements. Sr concentrations range between 84 and 156 ppm, and the molar Sr/Ca ratios of dolomitizing fluids are estimated to range between 0.0066 to 0.013 ratios. Dolomites are Ca‐rich (with average CaCO3 and MgCO3 equal to 56.43 and 43.57 mol%, respectively) and they are non‐stoichiometric, with an average Sr=116 ppm, Na=286 ppm, Mn=81 ppm, Fe=1329 ppm, and δ18O and δ13C ranges from ?0.6‰ to ?6.1‰ Pee Dee Belemnite PDB], and +1.2 to +3.9‰ PDB. The North American Shale Composition NASC]‐normalized rare earth element (REE) values of the both limestone and dolomite sample groups show very similar REE patterns characterized by small positive Eu (mean=1.32 and mean=1.42, respectively) and slightly or considerably negative Ce (mean=0.61 and mean=0.72, respectively) anomalies and a clear depletion in all REE species. The K?z?loren Formation dolomites have been formed as early diagenetic from mixing zone fluids at the tidal‐subtidal environment and at the late diagenetic from basinal brines at the shallow‐deep burial depths. |
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| Keywords: | dolomite K?z?loren Akp?nar peritidal petrography geochemistry |
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