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  • Dr Michelle Harris

    I use a combination of petrology and geochemistry on samples recovered from ocean crust through scientific ocean drilling to address key questions about the timing, distribution and magnitude of hydrothermal fluid fluxes in the upper and lower ocean crust. I also use calcium carbonate veins precipitated from low temperature hydrothermal fluids

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  • Svenja Jöns

    Rausch S, Böhm F, Bach W, Klügel A, Eisenhauer A (2013): Calcium carbonate veins in ocean crust record a threefold increase of seawater Mg/Ca in the past 30 Million years.

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  • Geochemistry, Geophysics, Geosystems

    The vein filling in the basalt consists of clay minerals (smectite and saponite), calcium carbonates, quartz, and pyrite. All four minerals occur in centimeter-thick veins, in some cases with several generations of calcium carbonate. Pyrite is present in veins and in both host rocks. Veins in the basalt are more or less

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  • mercury and molybdenum are the metals with copper and veins

    mercury and molybdenum are the metals with copper and veins being deposited In from ESCI 1001 at University of Minnesota-Twin Cities

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  • The evolution of the equatorial thermocline and the early

    The tropical Pacific thermocline strength, depth, and tilt are critical to tropical mean state and variability. During the early Pliocene (~3.5 to 4.5 Ma), the Eastern Equatorial Pacific (EEP) thermocline was deeper and the cold tongue was warmer than today, which resulted in a mean state with a reduced zonal sea surface temperature gradient or El Padre.

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  • Carbonate veins reveal chemistry of ancient seawater

    Calcium carbonate veins record the chemical evolution of seawater as it flows through the ocean crust and reacts with the rock. The composition of past seawater can therefore be determined from

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  • Calcium carbonate veins in ocean crust record a threefold

    Request PDF | Calcium carbonate veins in ocean crust record a threefold increase of seawater Mg/Ca in the past 30 Million years | Chemical (Sr, Mg) and isotopic (δ18O, 87Sr/86Sr) compositions of

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  • Reconstructing past seawater Mg/Ca and Sr/Ca from mid-ocean

    We estimated past oceanic Mg/Ca and Sr/Ca ratios from suites of 1.6- to 170-million-year-old calcium carbonate veins that had precipitated from seawater-derived fluids in ocean ridge flank basalts. Our data indicate that before the Neogene, oceanic Mg/Ca and Sr/Ca ratios were lower than in the modern ocean.

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  • Reconstructing Past Seawater Mg/Ca and Sr/Ca Veins Rosalind M

    Veins from Mid-Ocean Ridge Flank Calcium Carbonate Reconstructing Past Seawater Mg/Ca and Sr/Ca This copy is for your personal, non-commercial use only. colleagues, clients, or customers by clicking here. If you wish to distribute this article to others, you can order high-quality copies for your following the guidelines here.

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  • Calcium carbonate veins in ocean crust record a threefold

    Calcium carbonate veins in ocean crust record a threefold increase of seawater Mg/Ca in the past 30 Million years By Svenja Rausch, Florian Böhm, Wolfgang Bach, Andreas Klügel and Anton Eisenhauer

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  • GEOL 1404 | Vocabulary Questions and Study Guide

    Distinctly laminated accumulations of calcium carbonate having rounded, branching, or frondose shape and believed to form as a result of the metabolic activity of marine algae. They are usually found in the high intertidal to low supratidal zones.

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  • Calcium carbonate veins in ocean crust record a threefold

    Calcium carbonate veins in ocean crust record a threefold increase of seawater Mg/Ca in the past 30 Million years By Svenja Rausch, Florian Böhm, Wolfgang Bach, Andreas Klügel and Anton Eisenhauer

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  • The effects of secular calcium and magnesium

    The concentrations of dissolved magnesium [Mg 2+] and calcium [Ca 2+] are of particular importance for the carbon cycle because these ions greatly reduce the activity of carbonate ion [CO 3 2−] via strong anion-cation interaction [e.g., Garrels and Thompson, 1962; Millero and Schreiber, 1982] and because [Ca 2+] is a direct factor in the

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  • mid-ocean ridges: 51 Research Articles

    Calcium carbonate veins in ocean crust record a threefold increase of seawater Mg/Ca in the past 30 million years Fulltext Access 10 Pages 2013 Distribution of the biomass-dominant pelagic fish, Bathylagus euryops (Argentiniformes: Microstomatidae), along the northern Mid-Atlantic Ridge

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  • Rausch, S et al. (2013): Calcium carbonate vein

    A plausible scenario is intensified carbonate production due to increased alkalinity input to the oceans from silicate weathering, which in turn is a result of subduction-zone recycling of CO2 from pelagic carbonate formed after the Cretaceous slow-down in ocean crust production rate.

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  • Rausch, S et al. (2013): (Table S1) Calcium carbonate vein

    In supplement to: Rausch, S et al. (2013): Calcium carbonate veins in ocean crust record a threefold increase of seawater Mg/Ca in the past 30 million years.Earth and

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  • mid-ocean ridges: 51 Research Articles

    Calcium carbonate veins in ocean crust record a threefold increase of seawater Mg/Ca in the past 30 million years Fulltext Access 10 Pages 2013 Distribution of the biomass-dominant pelagic fish, Bathylagus euryops (Argentiniformes: Microstomatidae), along the northern Mid-Atlantic Ridge

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  • Using Calcium Isotopic Composition of Calcium Carbonate Veins

    Calcium carbonate vein formation in the oceanic crust has been proposed as a climate-sensitive feedback mechanism that regulates the carbon cycle on million-year timescales. The suggestion has been that higher pCO2 levels may drive changes in ocean temperature and pH that increase seafloor alteration, releasing more calcium from oceanic basalt. This results in more removal of carbon from Earth

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  • Title: Hydrothermal alteration of the ocean crust : insights

    Carbonate veins from the Juan de Fuca Ridge and Ocean Drilling Program Site 1256 record a sufficient decrease in the fluid Sr-isotopic composition with temperature to balance the global ocean Sr budget, however, this result cannot be reconciled with the observation of Davis et al. (2003) that the studied ocean crust has exchanged insufficient

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  • Earth and Planetary Science

    ganic marine cements (Sandberg, 1983), low-temperature calcium carbonate veins in oceanic crust (Coggon et al., 2010), and bio-genic carbonates (Dickson, 2002; Stanley and Hardie, 1998). Simi-lar covariation between seawater Mg/Ca and climate, observed on hundred million year timescales throughout the Phanerozoic (the

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  • What is Calcium Carbonate?

    Calcium carbonate, or CaCO3, comprises more than 4% of the earth’s crust and is found throughout the world. Its most common natural forms are chalk, limestone, and marble, produced by the sedimentation of the shells of small fossilized snails, shellfish, and coral over millions of years. Although all three forms are identical in chemical

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  • High sea surface temperatures in tropical

    The western warm pools of the Atlantic and Pacific oceans are a critical source of heat and moisture for the tropical climate system. Over the past five million years, global mean temperatures

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  • The role of calcium in regulating

    Fluid-inclusion data and carbonate mineralogical records are also Ca from mid-ocean ridge flank calcium carbonate veins. veins in ocean crust record a threefold increase of seawater Mg/Ca

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  • Calcium isotopes as a record of the marine calcium cycle

    calcium to seawater is riverine input, although hydrothermal fluids may account for ∼17% of total calcium input to the ocean (Tipper et al., 2010). The main output flux is the deposition of carbonate-bearing sediments, but evaporite deposition and alteration of oceanic crust are also important sinks for calcium.

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  • Calcium carbonate veins in ocean crust record a threefold

    Calcium carbonate veins in ocean crust record a threefold increase of seawater Mg/Ca in the past 30 million years. Author links open overlay panel Svenja Rausch a Florian Böhm b Wolfgang Bach a Andreas Klügel a Anton Eisenhauer b

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  • Calcium carbonate veins in ocean crust record a threefold

    Request PDF | Calcium carbonate veins in ocean crust record a threefold increase of seawater Mg/Ca in the past 30 Million years | Chemical (Sr, Mg) and isotopic (δ18O, 87Sr/86Sr) compositions of

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  • Reconstructing Past Ocean Chemistry

    Calcium carbonate veins record the chemical evolution of seawater as it flows through the ocean crust and reacts with the rock. The composition of past seawater can therefore be determined from suites of calcium carbonate veins that precipitated millions of years ago in ancient ocean crust.

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  • Carbonate Veins Offer Look At Chemistry Of Ancient Oceans

    Calcium carbonate veins record the chemical evolution of seawater as it flows through the ocean crust and reacts with the rock. The composition of past seawater can therefore be determined from suites of calcium carbonate veins that precipitated millions of years ago in ancient ocean crust.

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  • History of carbonate ion concentration over the last 100

    gle d11B-based pH record available at the time (Pearson and Palmer, 2000), the latter of which has recently been revised (Anagnostou et al., 2016). Since then, multiple new and more robust data sets on past ocean carbonate chemistry, atmospheric CO 2, and major ion seawater composition have been published. This has prompted us to perform new CO

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  • 12.6 Sediment Distribution – Introduction to Oceanography

    Near mid-ocean ridge systems where new oceanic crust is being formed, sediments are thinner, as they have had less time to accumulate on the younger crust. As you move away from the ridge spreading center the sediments get progressively thicker (see section 4. 5), increasing by approximately 100-200 m of sediment for every 1000 km distance from

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