Fingerprints of fluid flow: Chemical diagenetic history of the Jurassic Navajo Sandstone, southern Utah, USA
Fingerprints of fluid flow: Chemical diagenetic history of the Jurassic Navajo Sandstone, southern Utah, USA
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DOI：
10.2110/jsr.2005.045
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发表时间：
2005-07-01
影响因子：
2
通讯作者：
Chan, MA
中科院分区：
文献类型：
--
作者：
Beitler, B;Parry, WT;Chan, MA
在侏罗纪纳瓦霍砂岩中，成岩氧化铁、粘土和碳酸盐胶结物的彩色露头暴露反映了流体-岩石相互作用的多阶段历史。整个犹他州南部在微观和露头尺度上存在特征矿物学和地球化学变异性。我们确定了六个常见的成岩相，并评估形成机制，共生关系，蚀变事件之间的相对时间。成岩相具有鲜明的视觉特征，在矿物学、主要氧化物、微量元素和碳氧同位素方面存在差异。它们包括红色和漂白砂岩、弥散和结核状氧化铁沉淀物以及碳酸盐结核。这些相的发展需要在间隙流体环境的变化和开放的地球化学系统与全盆流体流动和氧化还原条件的变化。古水文和成岩条件的时空变化反映了地层结构、流体流动和盆地演化之间的复杂耦合和反馈。
Colorful outcrop exposures of diagenetic iron oxide, clay, and carbonate cements in the Jurassic Navajo Sandstone reflect a multi-phase history of fluid-rock interactions. Characteristic mineralogical and geochemical variability occurs on microscopic and outcrop scales throughout southern Utah. We identify six common diagenetic facies and evaluate formation mechanisms, paragenetic relationships, and relative timing between alteration events. The diagenetic facies have distinctive visual characteristics, variations in mineralogy, major oxides, trace elements, and carbon and oxygen isotopes. They include red and bleached sandstone, diffuse and concretionary iron oxide precipitates, and carbonate concretions. Development of these facies requires changes in the interstitial fluid environment and an open geochemical system with basinwide fluid flow and variations in redox conditions. Spatial and temporal changes in paleohydrologic and diagenetic conditions indicate complex coupling and feedbacks between stratigraphic architecture, fluid flow, and basin evolution.