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THE PRELIMINARY RESULTS ON THE KAOLINISATION OF TERTIARY VOLCANIC ROCKS IN THE BIGA PENINSULA (LAPSEKI-CANAKKALE), TURKEY
Abstract
This study presents preliminary results of our study on the kaolinisation of Tertiary magmatic units in the Biga Peninsula. Volcanic and intrusive rocks of Tertiary age crop out in the vicinity of the Harmancık and \"U\ccpınar villages of \cCanakkale country, Lapseki town. Volcanic rocks consist of andesites, basalts and rhyolites, whereas intrusive rocks consist of granitic plutons. The granitic intrusions cut the volcanic rocks. Kaolin deposits appears to have formed within the andesitic rocks. The kaoline deposit is located at nearly 3km northeast of \"U\ccpınar village. Outcrops of the deposit extends along a north-south trend with a width of 200- 250 m and a length of 600-700 m, reaching 10-15 m in thickness. The presence of clays minerals accompanied with feldspars and kaolinite indicates that the solutions from which the clay minerals precipitated were enriched in some alkali and alkali-earth ions. This implies weak kaolinisation. Besides, sudden and sharp temperature fluctuation of the solution due to seasonal rainfall seems to have prevented mobile silica movement upwards and resulted high amount of finely dispersed $\alpha$-quartz(SiO2>75\%) within the kaolin deposits. And as a results, the dissolved silica did not replace and silicify the main rocks and therefore, a “silica-gossan” did not develop. This can also be considered as another evidence for weak kaolinisation. We argue that the kaolinisation within the study area was formed by hydrothermal fluids circulating through the faults.
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