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网页2000年1月1日 Abstract. Carbonate fixation in the ocean proceeds in three basic modes: abiotically, biotically induced (with organic trigger), and biotically controlled (wher 网页Carbonate sediments form and accumulate in a wide range of depositional settings (Fig. 4) and carbonate sedimentary rocks are known from strata of all ages.Studies on carbonate 网页2012年1月23日 This scenario does not require environmental changes, such as increases in nutrient supply or siliciclastic sedimentation, to have taken place. A rate of relative 网页Most, though not all, carbonate sedimentation results basically from chemical or biochemical processes occurring in a special marine environment: one of clear, warm, shallow water. 网页2022年1月26日 where is the average dry bulk density and is sedimentation rate, which is the observed thickness of a unit divided by the depositional time (difference in age between its base and top). MARs account for 网页2020年10月1日 The sulfate reduction rate may also demonstrate apparent correlations with external environmental controls such as sedimentation rate, water depth, fraction of 网页For the calculation of mass accumulation rates (MAR), dry density data (DD = dry mass/wet volume [in grams per cubic centimeter]) and percent carbonate data (%CARB) were 网页2010年3月11日 Carbonate Sedimentation Rates Today and in the Past: Holocene of Florida Bay, Bahamas, and Bermuda vs. Upper Jurassic and Lower Cretaceous of the 网页1997年3月1日 Systematic experiments have been performed in calcium carbonate aqueous suspensions of varying volume fractions. The apparent yield stress value of a 网页2016年11月17日 calcium carbonate with concentrations of 2%, 4%, 6%, 8% and 10%. These concentrations. are in line with the other sedimentation rate research, obtaining a power function. The turbidity 网页2000年1月1日 Abstract. Carbonate fixation in the ocean proceeds in three basic modes: abiotically, biotically induced (with organic trigger), and biotically controlled (wher 网页2022年1月26日 where is the average dry bulk density and is sedimentation rate, which is the observed thickness of a unit divided by the depositional time (difference in age between its base and top). MARs account for 网页1994年1月1日 Isotope stratigraphy, sedimentation rates, deep circulation, and carbonate events in the Labrador Sea during the last ~ 200 ka C. Hillaire-Marcel; C. Hillaire-Marcel Two deep circulation regimes are indicated by contrasting sedimentation rates on the slopes: (i) the modern situation is characterized by a gyre of the North Atlantic Deep 网页The reported sedimentation rate data focussed on accumulation areas like the Norwegian Trough (Fig. 2). However, to be able to spatially predict sedimentation rates across the study site it is necessary to include data from areas of erosion and non-deposition, which predominate in the North Sea. 网页2019年8月5日 Although rate of carbonate deposition by encrusting calcifiers seems to be lower than hermatypic corals, it seems to be relevant on coral reefs affected by anthropogenic impacts where coral calcification is low. Such records were made where sedimentation rates were lower than 0.1 g m −2 d −1 and water transparency was higher 网页For the calculation of mass accumulation rates (MAR), dry density data (DD = dry mass/wet volume [in grams per cubic centimeter]) and percent carbonate data (%CARB) were linearly interpolated every 5 m. Total mass accumulation was then computed as. MAR(total) = DD × LSR/10 [g/cm 2 /k.y.], and carbonate accumulation rate as 网页@article{osti_6613868, title = {Glacial-interglacial sedimentation rates and turbidite frequency in the Bahamas: a clear case of carbonate shedding during high sea level stands}, author = {Droxler, A W and Schlager, W}, abstractNote = {Vail's sea level curve is built on a basic principle that siliciclastic continental shelves and implicitly carbonate platforms 网页The least understood carbonate environment in terms of both production and accumulation is prob-ably the continental shelf. Carbonate-poor shelves by definition have little or no significant carbonate accumulation; however the rate of accumulation on carbonate-rich shelves is not well documented. In terms of shelf carbonate production on all 网页Sedimentation rates are usually higher than those of the outer shelf of the East China Sea (Shi et al., 2010). In brief, freeze-dried sediment was placed in a crucible and soaked in 4 mol L −1 HCl for 48 h to remove most carbonate and then heated to 60 °C for 4 h to further remove some refractory carbonate minerals. The de‑carbonate 网页Holocene sedimentation rates calculated using the decay of 226Raexs in barite are consistent with ~4C and 6J80 derived sedimentation rates of 2 3 cm/kyr for the same cores. The method could be extendible to carbonate-poor Holocene sediments. 1. 网页Carbonate sedimentation is, however, a global phenomenon . Deep sea carbonate oozes have been known since the Challenger expedition (1872–1876 Carbonate production rates may be similar to those in the tropics, but a far more destructive early diagenetic regime (including abrasion, bioerosion, and dissolution) results in lower preservation 网页2000年1月1日 Abstract. Carbonate fixation in the ocean proceeds in three basic modes: abiotically, biotically induced (with organic trigger), and biotically controlled (wher 网页2020年3月25日 Sedimentation rates in the deep-sea are two to three orders of magnitude slower than coastal sediments (McLeod et al., 2011; Estes et al., 2019). Thus, C stocks down to 1 m depth in coastal sediments represent accumulation over 100 to 1000s of years, while a depth of 1 m in deep-sea sediments represent accumulation over 100s of 1000s 网页The reported sedimentation rate data focussed on accumulation areas like the Norwegian Trough (Fig. 2). However, to be able to spatially predict sedimentation rates across the study site it is necessary to include data from areas of erosion and non-deposition, which predominate in the North Sea. 网页2013年1月1日 The sedimentation rate, also known as the deposition rate (D R), is the vertical flux of sediment to the depositional surface, such as the seafloor in the case of a marine environment (e.g., kg/m 2 per year). Sedimentation rates vary across time, because periods of rapid sedimentation alternate with periods of slower deposition, quiescence, or 网页2013年2月8日 In this , we concentrate on sedimentation rates on shallow carbonate platforms where sediment is to a large extent produced by organisms. Consequently, ecological control is important. Siliciclastics and nutrients are introduced by continental run-off, which in turn is controlled by climate. By first evaluating sedimentation rates in Holocene 网页@article{osti_6613868, title = {Glacial-interglacial sedimentation rates and turbidite frequency in the Bahamas: a clear case of carbonate shedding during high sea level stands}, author = {Droxler, A W and Schlager, W}, abstractNote = {Vail's sea level curve is built on a basic principle that siliciclastic continental shelves and implicitly carbonate platforms 网页Sedimentation rates are usually higher than those of the outer shelf of the East China Sea (Shi et al., 2010). In brief, freeze-dried sediment was placed in a crucible and soaked in 4 mol L −1 HCl for 48 h to remove most carbonate and then heated to 60 °C for 4 h to further remove some refractory carbonate minerals. The de‑carbonate 网页What are sedimentation rates? In coastal waterways, sedimentation rates refer to the amount of material (organic and mineral) deposited by the action of water over a given interval of time. Sedimentation is measured in 网页Holocene sedimentation rates calculated using the decay of 226Raexs in barite are consistent with ~4C and 6J80 derived sedimentation rates of 2 3 cm/kyr for the same cores. The method could be extendible to carbonate-poor Holocene sediments. 1.
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