Arid
DOI10.1346/CCMN.2016.0640206
MINERALOGY, GEOCHEMISTRY, AND GENESIS OF SEPIOLITE AND PALYGORSKITE IN NEOGENE LACUSTRINE SEDIMENTS, ESKISEHIR PROVINCE, WEST CENTRAL ANATOLIA, TURKEY
Kadir, Selahattin1; Erkoyun, Hulya1; Eren, Muhsin2; Huggett, Jennifer3; Onalgil, Nergis1
通讯作者Kadir, Selahattin
会议名称Euroclay Conference
会议日期2015
会议地点Edinburgh, SCOTLAND
英文摘要

Sepiolite and palygorskite are ccommon as layers and nodules in the Neogene lacustrine sediments of the Eskisehir area. This study aims to determine their mineralogical and geochemical characteristics, plus the distribution of these economically important sepiolite and palygorskite deposits within the lacustrine environment. Using these data the research goes on to discuss the environmental conditions for their formation. Sepiolite and palygorskite layers are associated with dolomite, marlstone, and argillaceous limestone. The sepiolite nodules (meerschaum), which are former magnesite gravels, are observed in the Upper Miocene reddish-brown fluvial deposits derived from the ophiolite and its fracture-infills at the northern margin of the basin. Sepiolite and palygorskite are only sparsely associated with dolomite and accessory magnesite, quartz, feldspar, and amphibole. Sepiolite and palygorskite fibers formed as oriented platy fan, interwoven, and knitted aggregates in the absence of dolomite indicated precipitation from supersaturated solution. Sepiolite and palygorskite fibers edging dolomite crystals postdate dolomite and formed through precipitation in a vadose environment under semi-arid to arid climatic conditions. High values of Mg+Fe+Ni and enrichment of light rare earth elements (LREE) relative to middle rare earth elements (MREE) and heavy rare earth elements (HREE), Sr content, depletion of Rb+Ba and K, and negligible negative Eu anomalies all reflect the derivation from the Paleozoic metamorphic and Upper Cretaceous ophiolitic rocks. Locally, Upper Miocene to Lower Pliocene volcanic, volcanoclastic, and fluvio-lacustrine sedimentary rocks supplied the required Si, Mg, Al, and Fe for precipitation of Al-sepiolite and Mg-palygorskite with average structural formulae of Si11.91Al0.09O30Mg6.60Al0.78Fe0.13 (OH)(4)Na0.12K0.06(OH2)(4).nH(2)O and Si7.74Al0.26O20Mg2.52Al1.13Fe0.38(OH)(2)(OH2)(4)Na0.32K0.14 Ca-0.12.nH(2)O, respectively. In contrast to the layered sepiolites, the absence of Al and high Ni content in sepiolite nodules suggest formation through replacement of magnesite gravels at shallow burial in an alkaline environment. The calculated meerschaum sepiolite chemical formula is: Si12.02O30Mg7.87Fe0.01(OH)(4)Na0.3K0.03(OH2)(4).nH(2)O.


英文关键词Argillaceous Carbonate Dolomite Eskisehir Meerschaum Sepiolite Neogene Palygorskite Sepiolite Turkey
来源出版物CLAYS AND CLAY MINERALS
ISSN0009-8604
EISSN1552-8367
出版年2016
卷号64
期号1-2
页码145-166
出版者CLAY MINERALS SOC
类型Article;Proceedings Paper
语种英语
国家Turkey;England
收录类别SCI-E ; CPCI-S
WOS记录号WOS:000381953000008
WOS关键词CLAY-MINERALS ; HYDROGEN ISOTOPE ; SOUTHERN TURKEY ; METEORIC WATERS ; MADRID BASIN ; MERSIN AREA ; MG-RICH ; OXYGEN ; DEPOSITS ; SPAIN
WOS类目Chemistry, Physical ; Geosciences, Multidisciplinary ; Mineralogy ; Soil Science
WOS研究方向Chemistry ; Geology ; Mineralogy ; Agriculture
资源类型会议论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/305549
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.Nat Hist Museum, Dept Earth Sci, Cromwell Rd, London SW7 5BD, England
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Kadir, Selahattin,Erkoyun, Hulya,Eren, Muhsin,et al. MINERALOGY, GEOCHEMISTRY, AND GENESIS OF SEPIOLITE AND PALYGORSKITE IN NEOGENE LACUSTRINE SEDIMENTS, ESKISEHIR PROVINCE, WEST CENTRAL ANATOLIA, TURKEY[C]:CLAY MINERALS SOC,2016:145-166.
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