Mathematics – Logic
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..63...63l&link_type=abstract
Earth and Planetary Science Letters, Volume 63, Issue 1, p. 63-75.
Mathematics
Logic
9
Scientific paper
During DSDP Leg 70, a 1.60 m thick manganese oxide layer was sampled in hole 509B. This deposit is formed of alternating layers of hard plates of pure todorokite, about 2 mm thick, and of a more powdery material deeply impregnated with manganese oxide, about 3 mm thick. A SEM study of the plates and the associated powder shows that the powdery material is a transformation of a pre-existing sediment, while the plates are a direct precipitation from a hydrothermal solution.
The uranium series disequilibrium method was used to determine the ages of the plates. They are found to be in good chronological sequence and in accordance with the sedimentation rate of the area (4.9 cm/103 years) which implies that they have been formed at the sediment-seawater interface during a pulsed injection of hydrothermal solution. The powder presents systematically an ``older age'' which is explained by a slowing down of the injection while the normal sediment settles; the older age is due to the 230Th excess of the sediment.
Brichet Evelyne
Jehanno Celestine
Lalou Claude
Perez-Leclaire Heloïse
No associations
LandOfFree
Hydrothermal manganese oxide deposits from Galapagos mounds, DSDP Leg 70, hole 509B and ``Alvin'' dives 729 and 721 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 Hydrothermal manganese oxide deposits from Galapagos mounds, DSDP Leg 70, hole 509B and ``Alvin'' dives 729 and 721, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydrothermal manganese oxide deposits from Galapagos mounds, DSDP Leg 70, hole 509B and ``Alvin'' dives 729 and 721 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1234303