(Table 1) Summary of sampling points described and main petrographic, morphological and geochemical characteristics ...
Targeted sampling on the Dolgovskoy Mound (northern Shatsky Ridge) revealed the presence of spectacular laterally extensive and differently shaped authigenic carbonates. The sampling stations were selected based on sidescan sonar and profiler images that show patchy backscatter and irregular and dis...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Dataset |
| Language: | English |
| Published: |
PANGAEA
2008
|
| Subjects: | |
| Online Access: | https://dx.doi.org/10.1594/pangaea.771249 https://doi.pangaea.de/10.1594/PANGAEA.771249 |
| Summary: | Targeted sampling on the Dolgovskoy Mound (northern Shatsky Ridge) revealed the presence of spectacular laterally extensive and differently shaped authigenic carbonates. The sampling stations were selected based on sidescan sonar and profiler images that show patchy backscatter and irregular and discontinuous reflections in the near subsurface. The interpretation of acoustic data from the top part of the mound supports the seafloor observations and the sampling that revealed the presence of a complex subsurface plumbing system characterized by carbonates and gas. The crusts sampled consist of carbonate cemented layered hemipelagic sedimentary Unit 1 associated with several centimetres thick microbial mats. Three different carbonate morphologies were observed: (a) tabular slabs, (b) subsurface cavernous carbonates consisting of void chambers up to 20 cm**3 in size and (c) chimney and tubular conduits vertically oriented or forming a subhorizontal network in the subsurface. The methanogenic origin of the ... : Pv = pyrite, MgCC = Mg calcite, CC = calcite, Qz = quartz. ... |
|---|