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- W3174755429 abstract "This contribution provides a comparison between laminated microbial structures formed in saline lacustrine environments (lower and middle Miocene in the Sierra de Alcubierre and Montes de Castejón) and fluvial to fluvio-lacustrine environments (middle to upper Miocene in the Muela de Borja and Montolar hill), in the Ebro Basin. Saline and freshwater conditions were deduced from sedimentological features and stable isotope composition (δ13C and δ18O) of the carbonate facies. Primarily the focus is on laminae and lamination: shape, thickness, textural features, and lamina arrangement.In the saline carbonate lacustrine record, stromatolites and rare oncolites consist of calcite and dolomite, and occur as thin planar, domed, and stratiform stromatolites. These forms are always associated with laminated limestones and dolostones that include ripple and horizontal lamination, and hummocky cross-stratification. In the microbialites, micrite, microsparite, and sparite define three types of simple laminae that generally are grouped into composite dark and light laminae. The laminae are thin, flat to slightly undulate, with very smooth cross-sectional shapes. Preserved microbial components are rare and, when present, consist of loose filamentous bodies or rare tubes sub-perpendicular to lamination.In the freshwater environment (open-lake and fluvial record) abundant oncolites, calcite-coated stems and minor stromatolites consist of low-Mg calcite. These components formed in gently channeled streams and open lakes, with tufaceous palustrine fringes. The shape of oncolites reflects the morphology of the nuclei. The laminae consist of micrite, microsparite, and sparite, forming simple and composite laminae. The laminae are generally thick, gently undulate to wavy in cross section. There are multiple ranges of lamination. Microbial bush-shaped and fan-shaped bodies, set perpendicular to sub-perpendicular to lamination, are abundant, which makes the laminae wavy to crinkly and porous.It is suggested that salinity exerted some control on the types of microbes and/or their style of development, which impacted the geometry of the laminae. In all cases, the lamina arrangement into cycles can record seasonal to multi-annual changes in climate parameters. In contrast, gross morphology of microbialites was highly influenced by depth and hydrodynamics, and largely by the nucleus morphology in the case of oncolites and stem coatings." @default.
- W3174755429 created "2021-07-05" @default.
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- W3174755429 date "2021-01-01" @default.
- W3174755429 modified "2023-10-01" @default.
- W3174755429 title "Lacustrine and Fluvial Carbonate Microbialites in the Neogene of the Ebro Basin, Spain: A Summary of Up-to-Date Knowledge" @default.
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- W3174755429 doi "https://doi.org/10.1007/978-3-030-66576-0_6" @default.
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