The diagenetic formation of metal-rich layers in sapropel-containing sediments in the eastern Mediterranean

Details The diagenetic formation of metal-rich layers in sapropel-containing sediments in the eastern Mediterranean The diagenetic formation of metal-rich layers in sapropel-containing sediments in the eastern Mediterranean

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57..527p&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 57, Issue 3, pp.527-536

Physics

6

Scientific paper

Two cores recovered from different locations in the eastern Mediterranean contain intercalations of organic-rich sapropels in organic-poor hemipelagic sediments. In both cores enrichments of Mn and Fe were found in the oxidised section of the sediment, above the sapropel S 1 . The sediments followed a diagenetic cycle, which began after the sapropel formation finished (about 7000 years ago). First, during a non-steady-state diagenetic phase, metal-rich layers were formed at a downward moving oxidation front. The front decelerated at the top of the sapropel as a consequence of increasing amounts of C org and sulphides that had to be oxidised. During the second part of this non-steady-state phase, the oxidation front starts moving upwards with respect to the sapropel. Manganese is remobilised in preference to iron due to thermodynamics, reinforced by kinetics. When the upward movement of the oxidation front becomes equal to the sedimentation rate, steady-state is established with respect to the new organic-poor sedimentary circumstances. At location 31G1, the system is at or close to steady-state. At location 9G1, however, this steady-state phase has never been reached. Between 1900 and 1350 years BP, the organic carbon accumulation rate probably increased suddenly, inducing a retreat of the oxidation front and the non-steady-state formation of double peaks.

Affiliated with

Also associated with

No associations

Rating

The diagenetic formation of metal-rich layers in sapropel-containing sediments in the eastern Mediterranean does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The diagenetic formation of metal-rich layers in sapropel-containing sediments in the eastern Mediterranean, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The diagenetic formation of metal-rich layers in sapropel-containing sediments in the eastern Mediterranean will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1273950