...LIAM J. DORNEY,; JUDITH TOTMAN PARRISH,; MARJORIE A. CHAN,; STEPHEN T. HASIOTIS ABSTRACT Carbonate deposits in the Jurassic Navajo Sandstone of Utah reflect deposition in interdune lakes and springs. Interdune-lake deposits consist of flat-lying carbonate units. Springs formed tufa mounds...

...Benjamin Bourel; Jean-David Moreau; Vincent Trincal; Anne-Véronique Walter-Simonnet Abstract Tufas bearing plant macroremains are uncommon in the Causses Basin (southern France). Here, we report a new fossiliferous tufa deposits at Mende, in Lozère. This palaeontological site is the first...

..., Italy; Tel.: +39 091 23861622; Email: giovanna.scopelliti@unipa.it editorial responsability and handling by G. Ottonello. 03 2 2014 30 6 2014 © Società Geologica Italiana, Roma 2015 2015 Società Geologica Italiana waterfall tufa speleothems stable carbon and oxygen...

...Jon E. Spencer; P. Jonathan Patchett; Philip A. Pearthree; P. Kyle House; Andrei M. Sarna-Wojcicki; Elmira Wan; Jennifer A. Roskowski; James E. Faulds Abstract The lower Pliocene Bouse Formation in the lower Colorado River Valley (southwestern USA) consists of basal marl and dense tufa overlain...

...M. Cinta Osácar; Concha Arenas; Marta Vázquez-Urbez; Carlos Sancho; Luis F. Auqué; Gonzalo Pardo A bstract : A 12-year study (2000–2012) of the stable isotopes of recent fluvial tufas has been performed in the Monasterio de Piedra Natural Park (River Piedra, NE Iberian Peninsula), an area...

... sign. To test the Holocene age assumption we dated shorelines from two lake systems, Ngangla Ring Tso and Chabyer Tsaka (Zabuye), using 14 C and U-Th dating of shoreline tufas ( Fig. 1 ; Fig. DR1 and Tables DR1 and DR2 in the Data Repository). Tufas (CaCO 3 ) precipitated on shorelines of closed...

...Paul M. (Mitch) Harris; James Ellis; Samuel J. Purkis Abstract Select lacustrine and marine depositional settings show a spectrum of styles of carbonate deposition and illustrate the types of carbonates, with an emphasis on microbialites and tufa, to be expected in early rift settings. Early rift...

... and associated with carbonate tufa that precipitated from the ancient lake or declining seaway waters formed along the steep walls of the valley over a period of 1,000 years or more. Paleoenvironmental conditions likely conducive to formation of these unusual bioherms include: non-normal marine salinity, warm...

... spectacularly in Ikka Fjord in southwest Greenland as submarine carbonate tufa columns. Here, ikaite is formed as a result of submarine spring water mixing with cold seawater. As ikaite disintegrates at temperatures above 6–7°C, it has been speculated that global warming could endanger this unique habitat...

... to the precipitation of calcium carbonate, or tufa, which can impair drainage and clog filter fabrics, which in turn can lead to premature failure of roads and other infrastructure systems. Tufa precipitation of RCA has been studied in various states, but no studies have been conducted on RCA containing a coarse...

..., or left open. However, detailed macroscopic, microscopic, and geochemical analyses of these features reveal that they are, instead, macrophyte (stem) encrustations that form in standing water. While these features form in a manner similar to paludal tufa, they do not resemble typical tufa deposits (e.g...

... substratum. A critical geological re-interpretation of this area indicates that the Quaternary succession, composed by a relatively thin veneer of terrigenous deposits and by calcareous tufas , is the result of five major stages of drainage reorganization. The data from this study indicate that, similarly...

.... Sedimentation is mainly biogenic with the laying down of thick charophyte-rich tufas interbedded with silty layers in distal areas and palaeosols in proximal areas. These alternations point to four major deposit sequences with lowstand phases. The first two phases are dated at ca. 2426 and 1869 cal B.P...

...Dustin K. Rainey; Brian Jones Abstract The Fall Creek Tufa is a relict, mid- to late-Holocene freshwater carbonate spring deposit that is formed almost entirely of calcite-encased Cratoneuron commutatum gametophytes. The spring is presently active, emitting 13 °C meteorically derived waters...

...Akihiro Kano; Risa Hagiwara; Tatsuya Kawai; Masako Hori; Jun Matsuoka Abstract The stable-isotope composition of a tufa collected on subtropical Miyako Island, southern Japan, records climatic and hydrologic changes over a 15-year period (1989–2003). A total of 450 subsamples taken at increments...

...Akihiro Kano; Tatsuya Kawai; Jun Matsuoka; Takuji Ihara Abstract Individual rainfall events are recorded as thin clay bands in annually laminated, freshwater-carbonate tufa. Runoff from rainfall events entrains clay that then adheres to the tufa surface. A specimen collected from southwest Japan...

...Michael R. Rosen; Greg B. Arehart; Michael S. Lico Abstract Large tufa mounds (>3 m tall, with a basal circumference of 5 m) have been discovered on the margin of Big Soda Lake, Nevada, USA. These tufa mounds are rooted at a maximum of 4 m below the current lake surface and are actively forming...

...Sandy Bonny; Brian Jones Abstract At the Miette Hot Springs site, relict tufa stretches for nearly 500 m along the west side of Sulphur Creek valley and rises up to 30 m above the valley floor. The tufa, composed of low-Mg calcite, precipitated from waters discharged from a line of perched springs...

...Mona L. Becker; Jennifer M. Cole; E. Troy Rasbury; Vicki A. Pedone; Isabel P. Montañez; Gilbert N. Hanson Abstract Uranium concentrations of 42 to 169 ppm in fibrous calcite from spring-deposited tufa in the middle Miocene Barstow Formation, California, are among the highest reported for calcite...

...David Dian Zhang; Yingjun Zhang; An Zhu; Xing Cheng Abstract Waterfall tufa is widely distributed around the world, especially in tropical and subtropical karst areas. In these areas river water is generally supersaturated with respect to calcite, and the precipitation occurs mainly at waterfall...