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首页> 外文期刊>Carbonates and Evaporites >A rare natural gypsum ooide (Gypsolites) in an evaporitic playa lake of late miocene (?) to pliocene age in central Anatlia, Turkey
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A rare natural gypsum ooide (Gypsolites) in an evaporitic playa lake of late miocene (?) to pliocene age in central Anatlia, Turkey

机译：土耳其中部后期中新世（？）到中新世年龄的蒸发普拉亚湖中的一种罕见的天然石膏油化物（Gypsolites）

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Gyposolites are found in the western part of Polatli town, Polatli-Sivrihisar basin, about 90 km from Ankara, Turkey. Gypsolites are observed in a transition zone between a siliciclastic marginal lake and an evaporitic inner lake. The ooide-bearing strata have a small to moderate thickness (10 to 50 cm), are laterally restricted, and partially exhibit a sandy appearance, including various amounts of volcanoclastic grain and mud pellets. They sometimes show micro-gradations, parallel or cross-laminations and rippled surfaces, in which macroscopically there are evidences of biogenic activity such as fossil tracks and burrows, but microbial activity is intensively present within the gypsum cortex, yielding micro-moldic porosity. Gypsolites fabrics suggest either (I) they occur under bacterial activity in local salines or short-lived ponds that occupied the low-energy part of the lake or (ii) weak currents or wind activity exert a significant influence on the gypsolites fabric. Some traces of microbial mats within the cortex and micro-gradations, parallel or cross-laminations indicate that the concomitance of bacterial activity and inorganic processes contributed to the construction of gypsum ooide structures in the Neogene evaporitic lake environment.
机译：在距土耳其安卡拉约90公里的Polatli-Sivrihisar盆地Polatli镇的西部发现了滑坡岩。在硅质碎屑边缘湖和蒸发内湖之间的过渡带中观察到石膏滑石。含油化物地层厚度小至中等（10至50厘米），受侧向限制，部分呈沙质状，包括各种数量的火山碎屑颗粒和泥粒。它们有时表现出微梯度，平行或交叉分层以及波纹状表面，在宏观上有生物活性的证据，例如化石痕迹和洞穴，但是在石膏皮层中强烈存在微生物活性，产生了微孔隙。石膏溶胶织物表明（I）它们是在细菌活动下在局部盐分或占湖泊低能部分的短寿命池塘中发生的；或者（ii）弱电流或风活动对石膏溶胶织物有重大影响。皮质内的微生物垫的痕迹以及微观层次，平行或交叉的层状表明，细菌活性和无机过程的结合有助于在新近纪蒸发湖环境中构造石膏油化物结构。

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