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.

Nd isotope composition of the Ediacaran and earliest Cambrian phosphorite nodules and Fe sulphide from the East European Platform

2020 ◽  
Vol 157 (12) ◽  
pp. 2081-2088
Author(s):  
Sergey B Felitsyn ◽  
Eugeny S. Bogomolov
Keyword(s):  
East European Platform ◽  
Isotope Composition ◽  
Water Reservoir ◽  
Secular Change ◽  
Early Cambrian ◽  
Iron Sulphide ◽  
Nd Isotope ◽  
East European ◽  
Moscow Syneclise ◽  
Nd Isotope Composition

AbstractAn enhanced concentration of phosphorus has been found at the stratigraphic level of the disappearance of Ediacaran taxa in two areas, the Cis-Dniester region and the Moscow syneclise, on the East European Platform (EEP). The isotope composition of neodymium was determined in Fe sulphide and phosphorite in the same beds. Measured εNd(t) values in diagenetic phosphate nodules are similar to those in iron sulphide from the same layer. During the Ediacaran − Early Cambrian, accumulation of radiogenic Nd in the epeiric basins on the EEP increased progressively from −17.9 and −19.4 in pyrite from the sequence bottom to −7.9 and −8.5 in the Early Cambrian pyrite of the central part of the EEP. The Ediacaran phosphate nodules show εNd(t) ranging from −12.9 to −15.0, while that in the Early Cambrian nodules is typically c. −9.0. These data indicate the secular change in Nd isotope composition of the water reservoir on the EEP from Ediacaran to Cambrian.

Magmatic sources of quaternary lavas in the Kuril island arc: New data on Sr and Nd isotopy

2007 ◽  
Vol 417 (1) ◽  
pp. 1206-1211 ◽  
Author(s):  
Yu. A. Martynov ◽  
J. -I. Kimura ◽  
A. I. Khanchuk ◽  
A. V. Rybin ◽  
A. A. Chashchin ◽  
...  
Keyword(s):  
Kuril Island ◽  
Island Arc ◽  
Kuril Island Arc

Nd isotope composition of seep carbonates: Towards a new approach for constraining subseafloor fluid circulation at hydrocarbon seeps

2019 ◽  
Vol 503 ◽  
pp. 40-51 ◽  
Author(s):  
Michal Jakubowicz ◽  
Jolanta Dopieralska ◽  
Andrzej Kaim ◽  
Petr Skupien ◽  
Steffen Kiel ◽  
...  
Keyword(s):  
Isotope Composition ◽  
Fluid Circulation ◽  
Nd Isotope ◽  
New Approach ◽  
Hydrocarbon Seeps ◽  
Nd Isotope Composition

The 2405 Ma and 2310 Ma Mafic Dyke Swarms in the Karelian Craton: Age, Chemical and Sr-Nd Isotope Composition, and Tectonic Setting

2016 ◽  
Vol 90 (s1) ◽  
pp. 123-123
Author(s):  
A.V. Stepanova ◽  
E.B. Salnikova ◽  
A.V. Samsonov ◽  
Yu.O. Larionova ◽  
S.V. Egorova ◽  
...  
Keyword(s):  
Isotope Composition ◽  
Tectonic Setting ◽  
Mafic Dyke ◽  
Karelian Craton ◽  
Nd Isotope ◽  
Dyke Swarms ◽  
Nd Isotope Composition
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