The Oltu Gemstone is located in the north of Oltu town (Erzurum–NE Turkey) city as a low rank coal. The Oltu Gemstone occurs as lenticular forms with thickness not exceeding centimeter size and lateral continuity of a few meters within the Liassic–Lower Malm Olurdere Formation consisting chiefly of claystone, sandstone, and volcanics. Coals that are operated as Oltu Gemstone are represented by very high TOC (67.39–78.56% wt), high hydrogen index (HI) values (314–379 mg HC/g TOC) and very low oxygen index (OI) values (1–3 mg CO₂/g TOC). Low Pr/Ph ratios indicate that coals were prevented from oxidation and deposited under anoxic conditions. In Oltu Gemstone samples, C₂₉ dominates over C₂₇ and C₂₈ steranes. In general, high (C₁₉ + C₂₀)/C₂₃ tricyclic terpane, low Ts/(Ts + Tm), diasterane/sterane, and C₃₁R/C₃₀ hopane ratios were recorded. C₂₉ MA steroids dominate with respect to others, and the C₂₉/(C₂₈ + C₂₉) MA ratio is mostly high. DBT/P ratio of Oltu Gemstone samples has low values. T_max values of Oltu Gemstone samples (between 416 and 436 °C) reflect immature–early mature character. 22S/(22R + 22S) homohopane, 20S/(20R + 20S), and ββ/(αα + ββ) sterane ratios and low moretane/hopane ratios, relatively high C₂₈-TA/(C₂₉-MA + C₂₈-TA), MA(I)/MA(I + II), TA(I)/TA(I + II), MPI-3 (β/α MP), and MDR ratios indicate early mature character for the Oltu Gemstone samples.

中文翻译：

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土耳其安那托利亚东北部埃尔祖鲁姆地区奥尔图宝石（煤）的有机地球化学和沉积环境

奥尔图（Oltu）宝石位于奥尔图镇（埃尔祖鲁姆–土耳其东北）北部，为低品位煤。奥尔图（Loltu）宝石以透镜状形式出现，厚度不超过厘米大小，并且在主要由粘土岩，砂岩和火山岩组成的Liassic-Lower Malm Olurdere组内具有几米的横向连续性。用作奥尔图宝石的煤具有极高的总有机碳（67.39-78.56％wt），高的氢指数（HI）值（314-379 mg HC / g TOC）和极低的氧指数（OI）值（1- 3 mg CO ₂ / g TOC）。低的Pr / Ph比表明，可以防止煤炭在缺氧条件下发生氧化和沉积。在奥尔图（Oltu）宝石样品中，C ₂₉比C ₂₇和C ₂₈甾烷占优势。一般而言，高（C_记录了19 + C ₂₀）/ C ₂₃三环戊烷，低Ts /（Ts + Tm），非甾烷/甾烷和C ₃₁ R / C ₃₀ hop烷的比率。C ₂₉ MA类固醇相对于其他类固醇占主导地位，并且C ₂₉ /（C ₂₈ + C ₂₉）MA类比大部分较高。奥尔图宝石样品的DBT / P比值较低。Oltu宝石样品的T _max值（介于416和436°C之间）反映了未成熟的早期特征。22S /（22R + 22S）同庚烷，20S /（20R + 20S）和ββ/（αα+ββ）甾烷比率和较低的茂铁/烷比率，相对较高的C ₂₈ -TA /（C ₂₉ -MA + C ₂₈-TA），MA（I）/ MA（I + II），TA（I）/ TA（I + II），MPI-3（β/αMP）和MDR比表明Oltu宝石样品的早期成熟特征。