Relationship Between Manganese Nodule Distribution and Deep-Sea Sediment Properties in the Northeastern Pacific

2012 ◽  
Author(s):  
Sang-Bum Chi ◽  
Wonnyon Kim ◽  
Cheong-Kee Park ◽  
Chanmin Yoo ◽  
Youngtak Ko ◽  
...  
Keyword(s):  
Primary Productivity ◽  
Deep Sea ◽  
Regional Scale ◽  
Chemical Properties ◽  
Manganese Nodule ◽  
Sediment Properties ◽  
Deep Sea Sediment ◽  
Sea Floor ◽  
Sediment Types ◽  
Northeastern Pacific

In order to identify a potential relationship between the spatial distribution of Mn-nodule and deep-sea sediment properties in the Clarion-Clipperton fracture zone of the northeastern Pacific, physico-chemical properties of deep-sea sediments and photos of sea-floor are analyzed. In general, sediment types in the area show dramatic changes with latitude. Compared to the middle sector (8–12°N) covered with biogenic siliceous sediments, the northern (16–17°N) and southern (5–6°N) areas are dominated by pelagic red clays and calcareous sediments, respectively. Such a difference in sediment types probably produces regional-scale variations in Mn-nodule occurrence with latitude (5–17°N) along longitude (131.5°W). According to the photographic examination, manganese nodules are well exposed on the sea floor in the latitude of >8°N. In connection with the dominant oceanic environment, such observation indicates that calcareous sediments cover the diagenic nodules due to higher primary productivity and sedimentation rate in the latitude of <8°N. In addition, sediments in the latitude of 8–12°N show relatively high shear strength. Considering the operation of miner and environmental effect, highly consolidated B2 and C1 areas (8–12°N), showing higher nodule contents and relatively lower primary productivity, are the most plausible site for commercial mining.

REFLECTION COEFFICIENTS AND BOTTOM LOSSES AT NORMAL INCIDENCE COMPUTED FROM PACIFIC SEDIMENT PROPERTIES

Geophysics ◽  
1970 ◽  
Vol 35 (6) ◽  
pp. 995-1004 ◽  
Author(s):  
Edwin L. Hamilton
Keyword(s):  
Normal Incidence ◽  
Silty Sand ◽  
Reflection Coefficients ◽  
Silty Clay ◽  
Sediment Properties ◽  
Compressional Waves ◽  
Sea Floor ◽  
Sediment Types ◽  
The Pacific ◽  
Clayey Silt

Rayleigh reflection coefficients and bottom losses of compressional waves at normal incidence on the water‐sediment interface are computed with values of density and velocity measured in sea‐floor sediment samples; main sediment types in three major environments of the Pacific and adjacent areas are included. Some typical average computed values of acoustic bottom loss at normal incidence in db are (1) continental shelf: sands, 8; silty sand, 10; sandy silt, 14; silty clay, 16; (2) abyssal plain: clayey silt, 17; silty clay and clay, 21; and (3) abyssal hill: silty clay and clay, 17. Comparisons with actual measurements at sea by several investigators demonstrate the validity of the approach.

scholarly journals Complete Genome Sequence of Bacillus sp. Strain KH172YL63, Isolated from Deep-Sea Sediment

2020 ◽  
Vol 9 (16) ◽  
Author(s):  
Yumi Murai ◽  
Takahiro Masuda ◽  
Yasuhide Onuma ◽  
Daniel Evans-Yamamoto ◽  
Nao Takeuchi ◽  
...  
Keyword(s):  
Genome Sequence ◽  
Complete Genome Sequence ◽  
Deep Sea ◽  
Complete Genome ◽  
Nankai Trough ◽  
Bacillus Sp ◽  
Positive Bacterium ◽  
Deep Sea Sediment ◽  
Sea Floor ◽  
A Genome

Bacillus sp. strain KH172YL63 is a Gram-positive bacterium isolated from the deep-sea floor surface sediment at 3,308 m below sea level in the Nankai Trough in Japan. Here, we report the complete genome sequence of Bacillus sp. strain KH172YL63, which has a genome size of 4,251,700 bp and a G+C content of 44.8%.

Bacterial diversity in deep-sea sediment from northeastern Pacific Ocean

2008 ◽  
Vol 28 (2) ◽  
pp. 479-485 ◽  
Author(s):  
Xu Hongxiang ◽  
Wu Min ◽  
Wang Xiaogu ◽  
Yang Junyi ◽  
Wang Chunsheng
Keyword(s):  
Pacific Ocean ◽  
Bacterial Diversity ◽  
Deep Sea ◽  
Deep Sea Sediment ◽  
Northeastern Pacific

scholarly journals Impact of Bottom Trawling on Deep-Sea Sediment Properties along the Flanks of a Submarine Canyon

PLoS ONE ◽  
2014 ◽  
Vol 9 (8) ◽  
pp. e104536 ◽  
Author(s):  
Jacobo Martín ◽  
Pere Puig ◽  
Pere Masqué ◽  
Albert Palanques ◽  
Anabel Sánchez-Gómez
Keyword(s):  
Deep Sea ◽  
Submarine Canyon ◽  
Sediment Properties ◽  
Bottom Trawling ◽  
Deep Sea Sediment

scholarly journals Planktonic foraminifera-derived environmental DNA extracted from abyssal sediments preserves patterns of plankton macroecology

2017 ◽  
Vol 14 (11) ◽  
pp. 2741-2754 ◽  
Author(s):  
Raphaël Morard ◽  
Franck Lejzerowicz ◽  
Kate F. Darling ◽  
Béatrice Lecroq-Bennet ◽  
Mikkel Winther Pedersen ◽  
...  
Keyword(s):  
Deep Sea ◽  
Planktonic Foraminifera ◽  
Environmental Dna ◽  
Diversity Pattern ◽  
Deep Sea Sediment ◽  
Surface Ocean ◽  
Sediment Types ◽  
Similarity Structure ◽  
Organic Remains

Abstract. Deep-sea sediments constitute a unique archive of ocean change, fueled by a permanent rain of mineral and organic remains from the surface ocean. Until now, paleo-ecological analyses of this archive have been mostly based on information from taxa leaving fossils. In theory, environmental DNA (eDNA) in the sediment has the potential to provide information on non-fossilized taxa, allowing more comprehensive interpretations of the fossil record. Yet, the process controlling the transport and deposition of eDNA onto the sediment and the extent to which it preserves the features of past oceanic biota remains unknown. Planktonic foraminifera are the ideal taxa to allow an assessment of the eDNA signal modification during deposition because their fossils are well preserved in the sediment and their morphological taxonomy is documented by DNA barcodes. Specifically, we re-analyze foraminiferal-specific metabarcodes from 31 deep-sea sediment samples, which were shown to contain a small fraction of sequences from planktonic foraminifera. We confirm that the largest portion of the metabarcode originates from benthic bottom-dwelling foraminifera, representing the in situ community, but a small portion (< 10 %) of the metabarcodes can be unambiguously assigned to planktonic taxa. These organisms live exclusively in the surface ocean and the recovered barcodes thus represent an allochthonous component deposited with the rain of organic remains from the surface ocean. We take advantage of the planktonic foraminifera portion of the metabarcodes to establish to what extent the structure of the surface ocean biota is preserved in sedimentary eDNA. We show that planktonic foraminifera DNA is preserved in a range of marine sediment types, the composition of the recovered eDNA metabarcode is replicable and that both the similarity structure and the diversity pattern are preserved. Our results suggest that sedimentary eDNA could preserve the ecological structure of the entire pelagic community, including non-fossilized taxa, thus opening new avenues for paleoceanographic and paleoecological studies.

Alcanivorax profundimaris sp. nov., a Novel Marine Hydrocarbonoclastic Bacterium Isolated from Seawater and Deep-Sea Sediment

2021 ◽  
Vol 78 (3) ◽  
pp. 1053-1060
Author(s):  
Chunming Dong ◽  
Qiliang Lai ◽  
Xiupian Liu ◽  
Li Gu ◽  
Yu Zhang ◽  
...  
Keyword(s):  
Deep Sea ◽  
Deep Sea Sediment
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