The AA. propose a model of tufa sedimentation and analyse the factors controlling the location and development of the tufa structures in the Mijares River canyon (eastern Iberian range). They pay special attention to neotectonic activity of faults
as an agent that controls the morphotopographical and hydrodynamic context in which tufa development takes place during the Quaternary. Estimates of tufa deposition rates have also been calculated.
An environmental of fluvial tufas in the monsoonal tropics, Barkly karst, northern Australia
Australia ; Karst ; Microstructure ; Model ; Monsoon ; Palaeo-environment ; Queensland ; Tropical zone ; Tufa
This paper presents an environmental model that will aid interpretation of fossil fluvial tufas throughout monsoonal Australia. In the Barkly karst, northern Australia, tufas form in dam, cascade and pool/waterhole geomorphic environments. Each
environment is represented in the morphostratigraphical record by a specific combination of tufa geomorphic units and facies associations. A diverse array of tufa facies is present, including microphytic, larval, calcite raft, macrophytic and allochtonous
Although large dimension tufa deposits are widely distributed throughout drier karst areas of Southern Africa, active tufa precipitation is rare. This report records a site of limited, but rapid tufa deposition at Gorrokop on the Gaap Plateau
Reconnaissance studies of the tufa deposits of the Napier Range, N. W. Australia
The aims of this paper are to describe a previously unrecorded suite of tufas from N. W. Australia. Simple geochemical and petrographical data are used to compare the different tufa types with each other and with tufas from other areas
, and to investigated the role of organisms in their formation. Finally, the results of this study are used to draw some general conclusions on the nature and importance of tufas in such tropical semiarid karst areas.
C 14 dating ; Croatia ; Fluvial processes ; Geochemistry ; Holocene ; Interglacial ; Karst ; Oxygen 18 ; Palaeo-environment ; Quaternary ; Th/U dating ; Tufa
The AA. present ages obtained by both U-Th and C 14 dating methods and the results of analyses of the stable isotope compositions of carbon (δC 13) and oxygen (δO 18) of tufa deposits from the Krka River area. The results are compared with C 14
and U-Th ages of tufa deposits from the Plitvice Lakes area and with C 14 ages of speleothem samples collected in numerous caves in the Dinaric Karst. The systematic differences between the δO 18 values of tufa formed in the Krka River and Plitvice Lakes
Temperate and semi-arid tufas in the Pleistocene to recent fluvial barrage system in the Mediterranean area : the Ruidera Lakes Natural Park (Central Spain)
Albacete ; Carbonate ; Dam ; Lacustrine sedimentation ; Lake ; Mediterranean area ; Quaternary ; Sedimentary ; Spain ; Th/U dating ; Tufa
The main aims of this article are to illustrate the genesis and evolution of a temperate semi-arid fluvial Pleistocene to Recent carbonate system in a Mediterranean area and to establish the different stages of tufa formation and its
Uranium-series age estimates and paleoclimatic significance of pleistocene tufas from the Lahontan Basin, California and Nevada
The AA. report data on the distribution of the isotopes of uranium and thorium in water and sediment from two drainage systems in the Lahontan Basin. These data are used to perform model calculations of ages of tufa samples from the Lahontan Basin
Uranium-series dating of carbonate (tufa) deposits associated with Quaternary fluctuations of Pyramid Lake, Nevada
C 14 dating ; Dating ; Geochronology ; Isotope dating ; Lake ; Lake level ; Nevada ; Pleistocene ; Quaternary ; Tufa ; United States of America ; Uranium
This study provides a record for the timing and magnitude of lake-level fluctuation in the Pyramid Lake subbasin during part of the last 400,000 yr. The AA. use uranium-series methods to determine the ages of some of the tufa varieties discussed
Late Holocene fluvial change in a tufa-depositing stream : Davys Creek, New South Wales, Australia
Australia ; Climatic variation ; Fluvial erosion ; Fluvial terrace ; Holocene ; Karst ; New South Wales ; Palaeo-environment ; Stratigraphy ; Stream ; Tufa
In this study, the first of its type in temperate Australia, the AA. used geomorphological and sedimentological evidence preserved in fossil tufas and alluvial terraces to investigate the fluvial history of Davys Creek. The nature and timing
Origin and evolution of tufa mounds related to artesian karstic springs in Isona area (Pyrenees, NE Spain)
Carbonate rock ; Geochronology ; Geophysics ; Hydrogeology ; Isotope dating ; Karst ; Model ; Pyrénées ; Sedimentology ; Spain ; Spring ; Tufa
This work analyses a suite of relict tufa mounds generated by artesian karstic springs in Isona area (Spanish Pyrenees). The paper provides an evolutionary geological model for these peculiar depositional landforms addressing the hydrogeological
), the geochronology of the buid-ups and the stable-isotope composition of the springwaters and tufa deposits.
Agricultural land use ; Climatic variation ; Human impact ; Interglacial ; Lithology ; Malta ; Mediterranean area ; Palaeo-environment ; Palynology ; Pedogenesis ; Pollen analysis ; Quaternary ; Soil erosion ; Stratigraphy ; Tufa
In this paper, examples of typical Mediterranean Quaternary lithofacies, including tufa and slope, fluvial, coastal, aeolian and cave deposits are described from the Maltese Islands.The deposits are correlated and their climatic signal