scholarly journals Some Peculiarities of Foraminifera Species Distribution Associated with Concentrations of 226 Ra, 238U, 232Th in the Deryugin Basin (the Sea of Okhotsk)

2018 ◽  
pp. 1-10
Author(s):  
Domanov Mikhail M. ◽  
◽  
Khusid Tatyana A. ◽  
Keyword(s):  
Species Distribution ◽  
Sea Of Okhotsk ◽  
Deryugin Basin ◽  
The Sea Of Okhotsk

Genesis and Nd Isotope Composition of Ferromanganese Deposits of the Sea of Okhotsk and the Kuril Island Arc

2021 ◽  
Vol 62 (9) ◽  
pp. 1074-1087
Author(s):  
P.E. Mikhailik ◽  
I.A. Vishnevskaya ◽  
E.V. Mikhailik ◽  
M.G. Blokhin ◽  
M.V. Chervyakovskaya ◽  
...  
Keyword(s):  
Sea Of Okhotsk ◽  
Kuril Island ◽  
Isotope Composition ◽  
Island Arc ◽  
Deryugin Basin ◽  
Nd Isotope ◽  
The Sea Of Okhotsk ◽  
Ferromanganese Deposits ◽  
Nd Isotope Composition ◽  
Kuril Island Arc

Abstract —The Nd isotope composition of ferromanganese deposits (FMD) from the central part of the Sea of Okhotsk and the Kuril island arc has been studied. The results showed that diagenetic samples from the Deryugin Basin have a heterogeneous Nd isotope composition. The positive εNd values here might be both due to the input of a terrigenous impurity and due to diffuse endogenetic element supply. The FMD samples from the Sonne underwater ridge show a εNd value specific to seawater (–3.2). The εNd value of hydrogenetic FMD from Volcano 7.14 is –3.4, which corresponds to the εNd value of the Pacific water. The FMD samples from Volcano 5.5 are characterized by εNd = –2.0. The higher εNd value might be due to a moderate dilution of the hydrothermal fluid by seawater and might also indicate the presence of volcanic fragments in the FMD samples. The highest εNd value (+4.4) has been established for volcaniclastic sandstone saturated with Fe and Mn hydroxides. It points to a mixing of volcanomictic and hydrothermal materials.

scholarly journals Peculiarities of anomalous gas-geochemical fields in the East Deryugin graben of the Sea of Okhotsk

2021 ◽  
Vol 5 (3) ◽  
pp. 229-239
Author(s):  
R.B. Shakirov ◽  
◽  
A.L. Venikova ◽  
N.L. Sokolova ◽  
A.I. Obzhirov ◽  
...  
Keyword(s):  
Methane Emission ◽  
Sea Of Okhotsk ◽  
Research Data ◽  
Methane Seep ◽  
Deryugin Basin ◽  
Gas Discharges ◽  
The Sea Of Okhotsk ◽  
Methane Distribution

This paper presents the research data on methane distribution in the area of the most noticeable gas discharges in the Deryugin Basin of the Sea of Okhotsk. In the East Deryugin graben, a unique methane seep is known, which spatially coincides with the local authigenic barite-carbonate mineralization. The question of the source nature, which is associated with the methane emission in the studied area, is considered.

Foraminifers in late Pleistocene-Holocene sediments of the Deryugin Basin of the Sea of Okhotsk

Oceanology ◽  
2009 ◽  
Vol 49 (5) ◽  
pp. 707-717
Author(s):  
T. A. Khusid ◽  
N. V. Belyaeva ◽  
M. P. Chekhovskaya ◽  
A. G. Matul
Keyword(s):  
Late Pleistocene ◽  
Sea Of Okhotsk ◽  
Deryugin Basin ◽  
The Sea Of Okhotsk ◽  
Holocene Sediments

Contribution to the flora of marine algae of the coastal zone of the northeastern part of the Sea of Okhotsk

2018 ◽  
Vol 52 (1) ◽  
pp. 63-73
Author(s):  
N. V. Evseeva
Keyword(s):  
Coastal Zone ◽  
Sea Of Okhotsk ◽  
Marine Algae ◽  
Herbarium Material ◽  
Northeastern Part ◽  
The Sea Of Okhotsk ◽  
The Family ◽  
First Time

The revision of the herbarium material, collected in the northern part of the Sea of Okhotsk in 1965–1966 and stored in VNIRO, allowed to expand the taxonomic list of macrophyte algae of the coastal zone of this area. The locations of discovery of 24 previously unmentioned species are described. Myrionema balticum, Ulvella repens, Syncoryne reinkei, Acrochaetium arcuatum were found in the Sea of Okhotsk for the first time. Most species new for the Sea of Okhotsk is represented by epiphytes of the family Ulvellaceae (Chlorophyta). The final taxonomic list of this region, including literature data, consists of 169 species.

CARBONATE DISSOLUTION AND ULTRASTRUCTURAL BREAKDOWN IN PLANKTONIC FORAMINIFERA IN THE SEA OF OKHOTSK

2017 ◽  
Author(s):  
Alexandra Romanova ◽  
Alexandra Romanova ◽  
Vladimir Anin ◽  
Vladimir Anin ◽  
Sergey Pletnev ◽  
...  
Keyword(s):  
Sea Of Okhotsk ◽  
Planktonic Foraminifera ◽  
Carbonate Dissolution ◽  
Calcite Dissolution ◽  
The Sea Of Okhotsk ◽  
Globigerina Bulloides ◽  
Neogloboquadrina Pachyderma ◽  
Thin Walled ◽  
Shell Fragments ◽  
Degree Of Fragmentation

80 sediment stations collected along the meridian transect across the Sea of Okhotsk were studied in order to reveal patterns of dissolution based on planktonic foraminifera. The degree of calcite dissolution intensity from planktonic foraminifera determined by different indices (degree of fragmentation, presence of susceptible to dissolution species, benthos/ plankton ratio). The highest degree of dissolution evidenced by a large number of shell fragments and corroding walls were found in sediments from the area of the Kuril Islands. The most revealing measure of probable dissolution of foraminiferal shells in the central part of the sea is a low number and lack of thin-walled species. The effects of dissolution on foraminiferal shells were studied for dominated species Neogloboquadrina pachyderma sin and Globigerina bulloides using a scanning electron microscope. The results are important for understanding processes of sedimentation, the paleo-oceanologial reconstructions and for obtaining reliable results in isotope analyzes.

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