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• W2153332672 abstract "Kaolin deposits, situated approximately 20 km south of Hisarc›k, have been formed by the alteration of dacite and dacitic tuffs related to the Miocene volcanism associated with extensional tectonics. The Hisarc›k kaolin deposits occur in the K›z›lcukur, Ulafllar and Kurtdere areas. Kaolinite is the only clay mineral associated with α- quartz, K-feldspar, plagioclase, alunite, natroalunite and hematite in some kaolins, whereas, other kaolinite accompanies smectite, which represents a moderate kaolinization. Low-cristobalite is the dominant silica mineral in these kaolins. In spite of strong kaolinization, the kaolins contain a high amount of finely-disseminated α-quartz in places, resulting in low Al2O3 values (13.80 wt% at the lowest). Variation in the thermal regime of the palaeohydrothermal system may affect the solubility of silica. In rainy seasons, due to a temperature drop, dissolved silica may be precipitated with the clays. The mineralogical zonations reveal that hydrothermal alteration is the main cause for the development of the kaolin deposits in the region. Hydrothermal silicification becomes more intense upwards. It results from dissolved silica moving in that direction, replacing and silicifying surrounding rocks, forming a silica zone (silica gossan) above the kaolin deposits. Basically, these silica gossans are the striking features on the exploration of the hydrothermal kaolin deposits. In places, the kaolin deposits also include thin silica veins and veinlets. Trace-element distribution data may not conclusively help to clarify the processes through which the kaolin formed. On the other hand, Pb and Sr enrichment within the deposits is supportive of the magmatic origin of hydrothermal solution. This is attributed to extensive Miocene volcanic activities in western Turkey. However, the data show that corrosive solutions, which may have arisen from the magma, have played a role in the kaolinization process together with hot meteoric waters. SEM studies show that there is a phase transition from montmorillonite to kaolinite. Ozet: Hisarc›k'›n yaklafl›k 20 km guneyinde bulunan kaolin yataklar›, gerilme tektonii ile iliflkili olan Miyosen volkanizmas› urunu dasit ve dasitik tuflerin alterasyonu sonucu oluflmufllard›r. Hisarc›k kaolenleri K›z›lcukur, Ulafllar ve Kurtdere bolgelerinde oluflmufltur. Baz› kaolin yataklar›nda tek kil minerali olarak bulunan kaolinit, alfa- kuvars, K-feldispat, plajiyoklaz, alunit, natro alunite ve hematit ile birlikte bulunur. Dier taraftan, baz› kaolenlerde, kaolinite ek olarak simektit de bulunmakta olup, bu durum orta fliddette bir kaolenleflmeyi ifade etmektedir. Bu kaolenler, fazla miktarda alfa-kristobalit icerir. Yer yer, kaolenlerin kuvvetli kaolenleflmeye ramen, yuksek miktarda ince taneli sac›lm›fl alfa-kuvars bulundurmas› sonucu, oldukca dufluk deerlerde Al2O3 (en dufluk deer % 13.80) icerirler. Paleohidrotermal sistemdeki termal rejim degifliklii, silika cozunurlulu¤unu etkiler. Yamurlu mevsimlerde, s›cakl›¤›n duflmesi sonucu, silika kil icerisinde cokelir. Cal›flma sahas›ndaki mineralojik zonlanma, hidrotermal alterasyonun, bolgedeki kaolenlerin oluflumunda ana faktor olduunu gostermektedir. Hidrotermal silisleflme yukar›ya doru oldukca etkilidir. fioyleki, eriyik halindeki silisin yukar› doru hareket ederek ustteki kayaclar› silisifiye etmesi sonucunda kaolen yataklar›n›n ust kesimlerinde silika zonlar› (silika gossan) oluflmufltur. Silika gossan'lar hidrotermal kaolen yataklar›n›n aranmas›nda belirleyici unsurlard›r. Kaolen yataklar›, yer yer ince silis damar ve damarc›klar› da icerirler. ‹z element da¤›l›m›, kaolenleflmeyi oluflturan yontemlerin tesbitinde tam bir bilgi vermemekle beraber, kaolen yataklar›ndaki Pb ve Sr zenginleflmesi, hidrotermal solusyonlar›n mamatik kaynakl› olabilecei sav›n› desteklemektedir. Bununla beraber, yukar›daki veriler, mamadan yukselen eritici solusyonlar›n s›cak meteorik sularla birlikte kaolenleflme iflleminde rol oynad›¤›n› gostermektedir. SEM cal›flmalar›, montmorillonitten kaolinite doru bir faz gecifli olduunu gostermektedir." @default.
• W2153332672 created "2016-06-24" @default.
• W2153332672 creator A5067791546 @default.
• W2153332672 date "2007-03-14" @default.
• W2153332672 modified "2023-09-25" @default.
• W2153332672 title "Origin of Kaolin Deposits: Evidence From the Hisarcık (Emet-Kütahya) Deposits, Western Turkey" @default.
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