Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1346/CCMN.2017.064067 |
AN APPROACH TO GENESIS OF SEPIOLITE AND PALYGORSKITE IN LACUSTRINE SEDIMENTS OF THE LOWER PLIOCENE SAKARYA AND PORSUK FORMATIONS IN THE SIVRIHISAR AND YUNUSEMRE-BICER REGIONS (ESKISEHIR), TURKEY | |
Kadir, Selahattin1; Eren, Muhsin2; Irkec, Taner3; Erkoyun, Hulya1; Kulah, Tacit4; Onalgil, Nergis1; Huggett, Jennifer5 | |
通讯作者 | Kadir, Selahattin |
来源期刊 | CLAYS AND CLAY MINERALS
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ISSN | 0009-8604 |
EISSN | 1552-8367 |
出版年 | 2017 |
卷号 | 65期号:5页码:310-328 |
英文摘要 | The Lower Pliocene lacustrine sediments of the Sakarya and Porsuk Formations in the Sivrihisar and Yunusemre-Bicer regions consist of claystone, argillaceous carbonate, carbonate, and evaporites. No detailed studies of paleoclimatic conditions have been performed previously. The present study aimed to determine the depositional environment and paleoclimatic conditions for the formation of these economically important sepiolite/palygorskite/carbonate/evaporite deposits based on detailed mineralogical, geochemical, and isotopic studies. Samples from various lacustrine sediments were examined using polarized-light microscopy, X-ray diffraction, scanning electron microscopy, and chemical and isotopic analysis methods. Dolomites are predominantly of micrite, which is partly recrystallized to dolomicrosparite/dolosparite close to desiccation fractures. The presence of ostracods and dacycladecean algae in the carbonates reflects a restricted depositional environment. The formation of sepiolite and palygorskite fibers, either as cement between/enclosing dolomite and/or as calcite crystals, reflects occasional changes in physicochemical conditions provided by fluctuations in the lake-water level and influx of groundwater in relation to climatic changes during and after dolomite precipitation. The positive correlations of Sigma REE with Al2O3, Nb, high-field-strength elements, and transition elements are due to alteration of feldspar and hornblende in the volcanic units. The high values of Ba and Sr relative to Cr, Co, Ni, and V also indicate that felsic rather than ophiolitic rocks were the parent material. The crossplot of whole-rock SiO2 vs. Al2O3+K2O+Na2O and V/Cr ratio suggests deposition of carbonate-dolomitic sepiolite-sepiolitic dolomite under arid climate and oxic conditions, whereas the Ni/Co and V/(V+Ni) ratios of the sediments indicate deposition of organic-bearing sepiolite/palygorskite under anoxic-dysoxic conditions. An enrichment in delta 13C and delta 18O values of dolomite with respect to calcite is probably due to differences in mineral fractionations. The delta 34S and delta 18O values and 87 Sr/86 Sr isotope ratios for gypsum suggest an intensely evaporitic lacustrine environment fed by an older marine evaporitic source. The Si, Al, Mg, Ca, and enhanced TOT/C required for periodic precipitation of organic-rich brown sepiolite/palygorskite characterize deposition in a swampy environment, while dolomitic sepiolite and sepiolitic dolomite formed in ponds by partial drying of the main alkaline lake. |
英文关键词 | Dolomite Gypsum Lower Pliocene Palygorskite Sepiolite Sivrihisar Yunusemre-Bicer Turkey |
类型 | Article |
语种 | 英语 |
国家 | Turkey ; England |
收录类别 | SCI-E |
WOS记录号 | WOS:000423279600002 |
WOS关键词 | CENTRAL ANATOLIA ; MIDDLE MIOCENE ; GEOCHEMISTRY ; BASIN ; DEPOSITS ; SULFATE ; OCCURRENCES ; ENVIRONMENT ; MINERALOGY ; MUDSTONES |
WOS类目 | Chemistry, Physical ; Geosciences, Multidisciplinary ; Mineralogy ; Soil Science |
WOS研究方向 | Chemistry ; Geology ; Mineralogy ; Agriculture |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/198119 |
作者单位 | 1.Eskisehir Osmangazi Univ, Dept Geol Engn, TR-26480 Eskisehir, Turkey; 2.Mersin Univ, Dept Geol Engn, TR-33343 Mersin, Turkey; 3.Anitta Pk Sitesi, 2853 Cad 32,Daire 3-15, TR-06810 Ankara, Turkey; 4.Dumlupinar Univ, Dept Geol Engn, TR-43100 Kutahya, Turkey; 5.Nat Hist Museum, Dept Earth Sci, London, England |
推荐引用方式 GB/T 7714 | Kadir, Selahattin,Eren, Muhsin,Irkec, Taner,et al. AN APPROACH TO GENESIS OF SEPIOLITE AND PALYGORSKITE IN LACUSTRINE SEDIMENTS OF THE LOWER PLIOCENE SAKARYA AND PORSUK FORMATIONS IN THE SIVRIHISAR AND YUNUSEMRE-BICER REGIONS (ESKISEHIR), TURKEY[J],2017,65(5):310-328. |
APA | Kadir, Selahattin.,Eren, Muhsin.,Irkec, Taner.,Erkoyun, Hulya.,Kulah, Tacit.,...&Huggett, Jennifer.(2017).AN APPROACH TO GENESIS OF SEPIOLITE AND PALYGORSKITE IN LACUSTRINE SEDIMENTS OF THE LOWER PLIOCENE SAKARYA AND PORSUK FORMATIONS IN THE SIVRIHISAR AND YUNUSEMRE-BICER REGIONS (ESKISEHIR), TURKEY.CLAYS AND CLAY MINERALS,65(5),310-328. |
MLA | Kadir, Selahattin,et al."AN APPROACH TO GENESIS OF SEPIOLITE AND PALYGORSKITE IN LACUSTRINE SEDIMENTS OF THE LOWER PLIOCENE SAKARYA AND PORSUK FORMATIONS IN THE SIVRIHISAR AND YUNUSEMRE-BICER REGIONS (ESKISEHIR), TURKEY".CLAYS AND CLAY MINERALS 65.5(2017):310-328. |
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