Organic petrography of graptolite fragments from Turkey |
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| Authors: | Fariborz Goodarzi |
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| Institution: | Institute of Sedimentary and Petroleum Geology, 3303 — 33rd Street N.W., Calgary, Alberta T2L 2A7, Canada |
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| Abstract: | The reflectance and bireflectance of graptolite fragments (Silurian-Ordovician) from southeast Turkey were examined and the morphology was described using reflected light microscopy. The dispersion of maximum and minimum reflectance of graptolites sectioned parallel and perpendicular to the bedding was also determined. The graptolites were anisotropic and the anisotropy was stronger for sections perpendicular to the bedding. The graptolite fragments show two types of surface morphology: granular and non-granular. The granular type had a rough surface and granular anisotropy, the non-granular fragments showed a smooth surface and basic anisotropy. The fine internal structure of graptolite was evident under crossed-polars. The reflectance of graptolite increased with depth and was higher than other organic material, e.g. bitumen, found in the same sediment. The present study indicates that the reflectance of graptolite in sediment can be used to determine the maturity of the dediment. |
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| Keywords: | Petrography Graptolite Reflectance |
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