Fish as major carbonate mud producers and missing components of the tropical carbonate factory

Fish as major carbonate mud producers and missing components of the tropical carbonate factory.

Carbonate mud is a major constituent of recent marine carbonate sediments and of ancient limestones, which contain unique records of changes in ocean chemistry and climate shifts in the geological past. However, the origin of carbonate mud is controversial and often problematic to resolve. Here we show that tropical marine fish produce and excrete various forms of precipitated (nonskeletal) cal...

Investigation of the Fractional Composition Effect of the Carbonate Weighting Agents on the Rheology of the Clayless Drilling Mud

The article considers the issue of reducing the influence of clayless mud components on the filtration parameters of the reservoir. In the composition of such solutions, calcium carbonate of various fractions is often added as a weighting and colmatizing additive. It is generally accepted that weighting bridging agents are sufficiently inert substances and their addition does not affect the rhe...

Effect of Carbonate Additives on Dynamic Filtration Index of Drilling Mud

Filtration index of the drilling fluid is an important parameter of well drilling, especially at drilling-in the reservoirs. Standard parameter in the study of drilling fluids is static filtration index. At the same time, it is more feasible to determine dynamic filtration index, if considering actual conditions of the well. Use of polymer carbonate-weighted drilling fluids is advisable at dril...

Oxygenation of the ocean and sediments: Consequences for the seafloor carbonate factory

a r t i c l e i n f o Keywords: paleoceanography carbonate sedimentology aqueous geochemistry Observed changes in the source of CaCO 3 sediments since Archean time suggest a first order pattern of decreasing abundance of carbonate cements precipitated directly on the seafloor. We propose that the observed reduction in CaCO 3 precipitation on the seafloor is caused by a decrease in CaCO 3 satura...

Lanthanum carbonate