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Showing 1 to 18 of 18 for “"travertine"”.
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Geochemical records in travertine veins at the Green River CO2 seeps (Utah)
… compositions from 100m to 10km scales. Tufa/travertine (CaCO3) deposits form at modern springs, and historic deposits form along both faults. Fossil travertine veins can be dated by U-Th chronology and preserve chemical signatures of the fluids they form from: trace metals, δ234Ui and …
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Microbial phylogenetic diversity preserved in facies-specific modern, recent, Holocene and Pleistocene hot-spring travertine deposits of Yellowstone and Turkey
… carbonate (CaCO3) limestone deposits called travertine. Microbial 16S rRNA gene sequences preserved within Modern travertine deposited within the Proximal Slope Facies (PSF) at Mammoth Hot Springs (MHS), Yellowstone National Park, has been directly compared with analogous Holocene-Late …
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Travertine from Egypt's Western Desert: a terrestrial record of North African paleohydrology and paleoclimate during the late Pleistocene
… in the desert. In this study, we show that the travertine record of Egypt's Western Desert constitutes a promising terrestrial proxy for North African paleohydrology. Integrating our reconnaissance sampling of travertine and modern groundwaters from five important oasis areas with data from …
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U-series dating, geochemistry, and geomorphic studies of travertines and springs of the Springerville area, east-central Arizona, and tectonic implications.
High CO2 springs and related travertine deposits of the Springerville area of east-central Arizona provide an exceptional field laboratory for understanding travertine-depositing spring systems. U-series dating of travertines provides an opportunity to unravel paleohydrologic and neotectonic …
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Structural Controls of the MacFarlane Geothermal System, Humboldt County, Nevada: New Insights Based on Detailed Geologic Mapping, Shallow Temperature Surveys, and Magnetic Data
… system. MacFarlane hot springs and the travertine fissure ridges lie within a relay ramp. The relay ramp is formed between two overlapping, north-northeast-striking, west-dipping Holocene normal faults exposed in Lake Lahontan sediments. Other mapped faults near the hot spring include a …
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GEOCHRONOLOGY, GEOCHEMISTRY, AND TECTONIC CHARACTERIZATION OF QUATERNARY LARGE-VOLUME TRAVERTINE DEPOSITS IN THE SOUTHWESTERN UNITED STATES AND THEIR IMPLICATIONS FOR CO2 SEQUESTRATION
Travertines are freshwater carbonates that precipitate from carbonic groundwater due to the degassing of CO2. Travertine deposits are often situated along faults that serve as conduits for CO2-charged groundwater and their geochemistry often records mixing of deeply-derived fluids and volatiles …
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Uranium-series geochronology and stable isotope analysis of travertine from Soda Dam, New Mexico : a Quaternary record of episodic spring discharge and rivern incision in the Jemez Mountains hydrothermal system
… geochronology provides data on timing of travertine deposition at Soda Dam, and a paleohydrologic record for the Valles Caldera hydrothermal system in Northern New Mexico for at least the last 500 ka. Travertine-depositing springs occur in San Diego Canyon, the only surface drainage outlet …
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Entwicklung einer Mikrobeprobung zur Th/U-Datierung und Anwendung an quartären Travertinen aus dem Thüringer Becken
Die Datierung von sekundären Karbonaten, wie Travertinen ist von großer Wichtigkeit, da archäologisch interessante Funde, wie Werkzeuge und Knochenfragmente im Travertin konserviert wurden. Travertine bestehen aus mindestens drei Calcitphasen, aus feinkörnigem, primärgebildetem Mikrit, aus …
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Physical and chemical controls on carbonate precipitation in surficial hot springs and subterranean cold springs
… pattern. Yellowstone carbonates, called the travertine terraced ponds, precipitate at rates of 0.4 - 0.8 mm/day from 38°C spring water that is about 48 times supersaturated with respect to calcite (Qcaicite = 48). Fogelpole carbonates, called speleothem rimmed pools, precipitate from l6°C …
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Geochemical characteristics and microbial diversity of CO2-rich mound springs of the Tierra Amarilla anticline, New Mexico
… in north-central New Mexico. This series of travertine-depositing CO2-rich springs is located along the boundary zone between the Colorado Plateau and Rio Grande rift, on the southern extension of the Nacimiento fault at the Tierra Amarilla anticline (TA). Geochemical data on the spring …
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Complex Fluid Dynamics: From Laminar to Geophysical Flows
… between aqueous chemistry and the underlying travertine. We show how these correlations can be used to reconstruct ancient depositional environments. We also present highly successful minimal models which explain the formation of depositional facies and large scale travertine motifs, including …
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Microstructural, geochronologic and thermochronologic evidence for both Paleo- and Mesoproterozoic displacement across the Gneiss Canyon shear zone : lower Granite Gorge, Grand Canyon, Arizona
… slow cooling from 200-150 oC between 1.2-0.8 Ga. Travertine Grotto K-feldspar modeling suggests cooling from ~300 oC at ~1300 Ma to ~200 oC by ~1100 Ma. This slower late cooling suggests burial of the Travertine Grotto block as a result of ~1.4 Ga west-side-up thrusting across the GCSZ. The …
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STRUCTURAL EVOLUTION OF THE RIO GRANDE RIFT: SYNCHRONOUS EXHUMATION OF RIFT FLANKS FROM 20-10 MA, EMBRYONIC CORE COMPLEXES, AND FLUID-ENHANCED QUATERNARY EXTENSION
… along the western edge of the Albuquerque basin, travertine deposits are cut by extensional veins that record anomalously high strain rates during the Quaternary at this location. The fluids that precipitated the travertine and calcite in veins also contain a small component of deeply-derived …
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Limit analysis of the Great Hall of Trajan's Markets in Rome using equilibrium methods
… static loading. Furthermore, sliding between the travertine blocks is not a consideration under static loading of the vault.
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Urban spiritual retreat
… and meeting and dining spaces. A massive travertine wall that divides public (profane) and private (sacred) spaces, is the main geometrical, focal and symbolic element to which the three buildings relate. In the design of this project the questions of what constitutes the necessary …
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Relative Timing of Porphyroblast Growth and Peak Metamorphism in the Lower Granite Gorge, Grand Canyon, Arizona.
… that forms the main tectonic fabric (S2). Travertine Canyon, east of the shear zone, preserves lower amphibolite grade Paleoproterozoic rocks with subvertical NE-trending fabric (S2). Prophyroblasts contain inclusion trails parallel to, and similar in morphology to, S2 indicating that …
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Seasonal Effects on the Geochemical Evolution of the Logsdon River, Mammoth Cave, Kentucky
… inputs from the plateau and precipitation of travertine along the flow path. Although values for all parameters are greater in summer than winter, the trend in evolution is similar for both seasonal extremes. The nature of the transition from summer to winter conditions in the aquifer was …
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CARBONIC SPRINGS AS DISTAL MANIFESTATIONS OF THE JEMEZ GEOTHERMAL SYSTEM, SAN YSIDRO, NEW MEXICO, HIGHLIGHTING THE IMPORTANCE OF FAULT PATHWAYS AND HYDROCHEMICAL MIXING.
… are warm (20oC) to hot (60oC) and all deposit travertine, pH ranges from 5.38 – 6.94; conductivities range from 3300 - 20000µS and PCO2 ranges from -0.94 to 0.93. San Ysidro springs look similar in major anions and cations to Penasco springs (both along the Nacimiento fault) and each shows a …