5.3 Hemipelagic and Pelagic Sediments
DEEP MARGINAL PLATEAU
WARM, STRONG CURRENTS
PELAGIC
CARBONATE
PARTIALLY RED,
STRONGLY CONDENSED,
a
UNCONFORMITIES, LAG DEPOSITS,
FERROMANGANESE CRUSTS AND NODULES,
SO ME GLAUCONITE.
RIDGE AND BASIN TOPOGRAPHY
(CALIFORNIA BORDERLAND·TYPE)
ISLAND SHELF SEDIMENTS,
TERRIG. AND BIOGENIC
CALCAREOUS SANDS AND
PHOSPHORITE
AND GLAUCONITE,
RELIC AND
RESIDUAL SED.
FROM UNDER·
LYNG ROCKS
ROCKY BOTTOM
(OLDER ROCKS)
209
SILICICLASTIC
SHELF
DEEP OCEANIG PLATEAU
WEAK CURRENTS. TEMPERATE TO COLD,
:!: COMPLETE PELAGIC SEQUENCE
b
( CALCAREOUS AND/ OR SILICEOUS,
:!: PHOSPHORITE), RARE
UNCONFORMITIES
S
SHALLOW·WATER
CARBONATE
PELAGIC TO HEMI·
PELAGIC SILICEOUS
MUD :!: CARBONATE
PLEISTOCENE MUD WITH
LIGHT ·DARK ALTER·
NATIONS, :!: CARBONATE
SEAMOUNTS
WITH PELAGIC
CARBONATE
( NANNOS, FORAMS)
:!: PHOSPHORITE
\
IN PLACES PERI·PLATFORM
REDISTRIBUTED CALC. MUD
AND BRECCIAS
HEMIPELAGIC
DEEP·SEA FAN,
BIOGENIC
MA1NLY TERRIGENOUS MAT.,
HIGH SEDIMENTATION
RATE ( 20·50 em/Ka )
CALCAREOUS SAND AND
MUDS (MOLLUSCS, FORA·
MINIFERS, ETC.
PELAGIC SEDIMENTS
(SILICEOUS AND/ OR CARB.)
HEMIPELAGIC AND REDEPOSITED
SLOPE SED. (MEDIUM SEDIM.
RATE, 5·10 em/ Ka )