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首页> 外文期刊>Sedimentology: Journal of the International Association of Sedimentologists >Quartz types in the Upper Pennsylvanian organic-rich Cline Shale (Wolfcamp D), Midland Basin, Texas: Implications for silica diagenesis, porosity evolution and rock mechanical properties
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Quartz types in the Upper Pennsylvanian organic-rich Cline Shale (Wolfcamp D), Midland Basin, Texas: Implications for silica diagenesis, porosity evolution and rock mechanical properties

机译：中宾夕法尼亚有机有机含量的石英类型（Wolfcamp D），德克萨斯州米德兰盆地：对二氧化硅成岩作用，孔隙度演化和岩石机械性能的影响

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摘要

The origin and form of quartz in mudrocks has significant implications for interpretation of depositional environments, diagenetic pathways, mechanisms of porosity reduction and rock mechanical-property evolution. Quartz types in the Upper Pennsylvanian Cline Shale, Midland Basin, Texas, were examined using a combination of field-emission scanning electron microscopy-based energy-dispersive spectroscopy elemental mapping (to determine mineralogy) and scanning electron microscopy-based cathodoluminescence imaging (to determine quartz types) with the goal of elucidating a high-resolution imaging protocol at the micrometre scale for shale petrology. Also, the unconfined compressive rock strength of shale samples with contrasting proportions of different quartz types was measured using Equotip Bambino analyses. The results suggest that extrabasinal detrital quartz, which accounts for an average of 26 vol.% of the rock in all analyzed samples, is the dominant form of quartz in the Cline Shale. The intergranular clay-size microquartz, which accounts for an average of 10 vol.% of the rock in all analyzed samples, is the dominant form of authigenic quartz. Dissolved radiolarians and sponge spicules are likely sources of silica for clay-size microquartz and other authigenic quartz showing pale-mauve to dark greyish cathodoluminescence colour. Some authigenic quartz in the form of intragranular pore filling and mollusc skeletal replacement displays bright-reddish cathodoluminescence colour, which may be associated with silica released at a different time in the rock's diagenetic history, such as during smectite illitization. Porosity reduction in the Cline Shale predominantly resulted from compaction because of extremely low intergranular volume and the general lack of early cementation. Quartz form significantly impacts rock mechanical properties in the Cline Shale: widely distributed intergranular clay-size microquartz cement is a major factor controlling rock strength. This correlation also applies to other mudrock successions of various geological ages, tectonic histories and lithologies.
机译：石英中石英的起源和形式对沉积环境，成岩途径，孔隙度降低机制和岩石机械性能的解释具有显着影响。使用现场发射扫描电子显微镜的能量分散光谱分子映射（以确定矿物学）和基于矿物学显微镜的阴极发光成像的基于现场排放扫描电子显微镜的组合来检查上宾夕法尼亚州德克萨斯州上宾夕法尼亚群岛页岩的石英类型石英类型）目的是以阐明Shale PoRology的微米标度的高分辨率成像协议。此外，使用Equot Bambino分析测量具有对比不同石英型比较的页岩样品的非束缚压缩岩体强度。结果表明，综合性扭转石英，平均占26体积的岩石中的岩石中的百分比，是克莱斯页岩中石英的主要形式。晶体粘土尺寸的微序列，平均占10体积的岩石中的岩石中的所有分析样本的百分比，是Authigenic石英的主要形式。溶解的放射性解体和海绵穗的可能是二氧化硅的粘土尺寸微序列和其他Aherigenic石英的来源，表现为浅淡紫色至深灰色的阴极发光颜色。一些Authigenic石英以鞘内孔隙填充和软体动物骨骼替代品的形式显示出亮 - 微的阴极致发光颜色，这可能与在岩石的成岩病史中不同时间释放的二氧化硅相关联，例如在蒙脱石中。由于极低的骨间体积和普遍缺乏早期胶结，克莱氏植物的孔隙率减少主要是由压实引起的。石英形式显着影响克莱拉莱斯中的岩石力学性能：广泛分布的晶间粘土尺寸微型微水泥是控制岩石强度的主要因素。这种相关性也适用于各种地质年龄，构造历史和岩性的其他混浊演替。

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