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    The role of fluids in faulting deformation:a case study from the Dead Sea Transform (Jordan)
    International Journal of Earth Sciences (2005)
    Ch. JanssenRolf L. RomerA. Hoffmann‐RotheBirgit MingramPeter DulskiPeter M�llerH. Al‐Zubi
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    Keywords:
    Isotopes of strontium
    Topics:
    earthquake and tectonic studies
    Geology and Paleoclimatology Research
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    The nature, origin and physicochemical controls of hydrothermal Mo-Bi mineralization in the Cadillac deposit, Quebec, Canada
    Mineralium Deposita (1998)
    H. TanerAnthony E. Williams‐JonesScott A. Wood
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    Hydrothermal activity and mineralization of Xiaolong gold deposit,western Jiangxi Province
    Mineralium Deposita (2011)
    Dong Guo
    Lithology
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    The use of burial diagenetic calcite cements to determine the controls upon hydrocarbon emplacement and mineralization on a carbonate platform, Derbyshire, England
    Geological Society London Special Publications (1996)
    Cathy HollisG. M. WalkdenCathy Hollis
    Abstract Late diagenetic calcite cements in the Upper Dinantian limestones of the Derbyshire Platform are contemporaneous with both hydrocarbon emplacement and Mississippi Valley-type (MVT) mineralization. Calcite cementation began during the progressive burial of the Derbyshire Platform and the surrounding basins, principally within fractures generated during the waning effects of Upper Carboniferous extension. Six burial calcite cements can be recognized in dilational vein systems. Successive veins contain progressively more mature hydrocarbon inclusions, and calcite cements are intergrown with fluorite, baryte, galena and sphalerite in increasing quantities. Compacting Dinantian-Namurian shales in basins adjacent to the platform offer the most likely sources of fluids, trace elements and hydrocarbons. Fluids entered the platform along major fault systems, and circulated using smaller fracture systems, precipitating calcite. The final phases of calcite cementation and the main phase of MVT mineralization coincided with the onset of the Variscan Orogeny. A model is now established relating fluid flow to Variscan tectonic events in northern Britain.
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    Ca, Sr, O and D isotope approach to defining the chemical evolution of hydrothermal fluids: Example from Long Valley, CA, USA
    Geochimica et Cosmochimica Acta (2013)
    Shaun T. BrownB. Mack KennedyDonald J. DePaoloShaul HurwitzWilliam C. Evans
    Isotopes of strontium
    Anhydrite
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    Microbially influenced formation of Mg‐calcite and Ca‐dolomite in the presence of exopolymeric substances produced by sulphate‐reducing bacteria
    Terra Nova (2013)
    Tomaso R. R. BontognaliJudith A. McKenzieR. WarthmannCrisógono Vásconcelos
    Abstract Some species of sulphate‐reducing bacteria ( SRB ) are known to mediate the formation of dolomite and Mg‐calcite. However, their exact role in the mineralization process remains elusive. Here, we present the result of a laboratory experiment that was designed to test whether formation of carbonate minerals by SRB can occur in the absence of living cells, through passive mineralization of their exopolymeric substances ( EPS ). SRB capable of mediating dolomite were cultivated in the laboratory, allowing them to secrete EPS . Microbial activity within the cultures was subsequently inhibited with antibiotics. Only after this step, Ca 2+ and Mg 2+ were added to the solution and carbonate minerals could form. Mg‐calcite and disordered Ca‐dolomite precipitated in association with EPS . The mol.% of Mg 2+ in the crystals increased with longer incubation times. This result demonstrates that organic compounds produced by SRB can mediate the formation of Ca‐Mg carbonates in the absence of an active metabolism.
    Sulfate-Reducing Bacteria
    Carbonate minerals
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    A technique for determining low concentrations of total carbonate in geologic materials
    Chemical Geology (1982)
    Jim BarkerS. Chatten
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    Carbonic acid
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    Geochemical characteristics of hydrothermal sediments for baritic rocks of Erlangping Group in northern Qinling Mountains and their significance for mineralization
    Global geology (2007)
    Jianguang Ren
    There exist bedded baritic rocks and copper polymetallic deposits which are sandwiched conformably in the Erlangpin Group of northern Qinling Mountains.The baritic rocks contain Al2O3 and TiO2 in lower contents,with concentration of thermal fluid compositions such as As,Sb,Ba,Ag and Hg.The ratio of trace elements U and Th is more than 1.The total REE is low(averaging 27.78×10-6).The ΣREE patterns display ΣLREE-rich but ΣHREE-depletion,with positive Eu anomaly and negative Ce anomaly,which is similarly to REE distribution pattern of chondrite within normalized typical hydrothermal deposits in TAG region.The results show the baritic rocks belonging to type of hot-water deposit.The paragenetic relationship of hydrothermal sedimentogenic baritic rocks and copper polymetalic deposits manifest that the copper polymetalic deposits are formed by the submarine hydrothermal exhalative lithogenesis and mineralization.
    Citations (2)