scholarly journals Effect of Serpentinite Dehydration in Subducting Slabs on Isotopic Diversity in Recycled Oceanic Crust and Its Role in Isotopic Heterogeneity of the Mantle

2019 ◽  
Vol 20 (11) ◽  
pp. 5449-5472 ◽  
Author(s):  
G. Shimoda ◽  
T. Kogiso
Keyword(s):  
Oceanic Crust ◽  
Isotopic Heterogeneity

scholarly journals Potassium isotopic heterogeneity in subducting oceanic plates

2020 ◽  
Vol 6 (49) ◽  
pp. eabb2472
Author(s):  
Yan Hu ◽  
Fang-Zhen Teng ◽  
Terry Plank ◽  
Catherine Chauvel
Keyword(s):  
Oceanic Crust ◽  
High Precision ◽  
Western Pacific ◽  
Isotopic Heterogeneity ◽  
Analytical Precision ◽  
Diagenetic Alteration ◽  
Continental Weathering ◽  
Oceanic Plates

Oceanic crust and sediments are the primary K sinks for seawater, and they deliver considerable amounts of K to the mantle via subduction. Historically, these crustal components were not studied for K isotopes because of the lack of analytical precision to differentiate terrestrial variations. Here, we report a high-precision dataset that reveals substantial variability in oceanic plates and provides further insights into the oceanic K cycle. Sixty-nine sediments worldwide yield a broad δ41K range from −1.3 to −0.02‰. The unusually low values are indicative of release of heavy K during continental weathering and uptake of light K during submarine diagenetic alteration. Twenty samples of altered western Pacific crust from ODP Site 801 display δ41K from −0.60 to −0.05‰, averaging at −0.32‰. Our results indicate that submarine alteration of oceanic plates is essential for generating the high-δ41K signature of seawater. These regionally varying subducting components are heterogeneous K inputs to the mantle.

Extremely asymmetric magmatic accretion of oceanic crust at the ends of slow-spreading ridge segments

Geology ◽  
2000 ◽  
Vol 28 (2) ◽  
pp. 179-182 ◽  
Author(s):  
Simon Allerton ◽  
Javier Escartín ◽  
Roger C. Searle
Keyword(s):  
Oceanic Crust ◽  
Spreading Ridge ◽  
Slow Spreading

NOBLE GASES TRACE DEHYDRATION OF SUBDUCTED OCEANIC CRUST

2016 ◽  
Author(s):  
Andrew J. Smye ◽  
◽  
Colin R.M. Jackson ◽  
Matthias Konrad-Schmolke ◽  
Stephen Parman ◽  
...  
Keyword(s):  
Oceanic Crust ◽  
Noble Gases ◽  
Subducted Oceanic Crust

TRANSFORM FAULTS IN THICK, ANISOTROPIC OCEANIC CRUST OF ICELAND: EVOLUTION OF STRUCTURES ASSOCIATED WITH OBLIQUE TO PARALLEL PLATE MOVEMENT

2018 ◽  
Author(s):  
Jeffrey Karson ◽  
◽  
Bryndís Brandsdóttir ◽  
Pàll Einarsson ◽  
James Farrell ◽  
...  
Keyword(s):  
Oceanic Crust ◽  
Parallel Plate ◽  
Transform Faults ◽  
Plate Movement
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