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30 Cards in this Set

  • Front
  • Back
Accretionary prism
The region of a subduction zone located between teh deep-sea trench and volcanic arc, where thick sedimentary units and volcanic rocks are squeezed and wrinkled by compression to form thurst faults and tight fold
Atlantic-type Margin
characterized by long history of sedimentation.
Biogenous sediment
deposits consisting of less than 30% by volume of paticles produced by organisms, such as the shells of diatoms, radiolaria, and foraminafera.
Bulk emplacement
Gravity induced transport of sediment, such as slumping and turbidity currents.
calcareous ooze
composedo f calcium carbonate
carbonate compensation depth (CCD)
Teh depth in teh ocean below which material composed of clacium is dissolved and does not accumulate on the seafloor.
Microscoic, unicellular phytoplankton possessing silica valves; they are responsible for much of teh ocean's primary production.
ferromanganse nodule
chemically precipitated from seawater, these more or less spherical masses, a few millimeters to several centimeters in diameter, are composed of concentric layers of iron ,manganese, and other metal oxides.
planktonic and benthonic protozoans that have a test composed of calcium carbonate.
glacial-marine sediment
sediment transported by glaciers and deposited in a marine environment.
hydrogenous sediment
consists largely of biochemical precipitates taht form in place they originate at the site of deposition by geochemical and biochemical reactions.
hydrothermal vents
an opening in the ground from which pour out hot, saline water solutions
ice rafting
The transport of sediment to the deep sea by floating icebergs which melt and drop their sediemnt load.
a sedimentary rock composed of calcium carbonate
Pacific- type margin
the edge of a continent that adjoins a tectonic plate boundray such as a subduction zone.
pelagic clay
brown clay
pelagic sediment
deep sea sediment that accumulates on the seafloor by the slow settlement of grains through the water column
a hydrogenous deposit consisting of nodules or cursts of P2O5
microscopic, unicellular planktonic and benthic animals that possess siliceous tests.
relict sediment
sedimetn on teh shelf that was deposited during teh recent geologic past and is not in equilibrium with the present day environment.
siliceous ooze
Material whose compositin is silica
the sliding of large cohering blocks of sediment or rock downslope under the influence of gravity.
the branch of geology that studies the relationship and significance of layerd sedimentary rocks
terrigenous sediments
sediments derived from teh mechanical weathering of rocks on land; equivalent to lithogenous sediment
poorly sorted sediment taht is deposited by glaciers.
sediment, typically with graded bedding, that is deposited by a turbidity current.
turbidity current
a density driven slurry of sediment-laden water which flows swiftly downhill displacing less dense water.
volcanogenous sediment.
derived from a volcano