forearc mantle
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2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Ryosuke Oyanagi ◽  
Atsushi Okamoto ◽  
Madhusoodhan Satish-Kumar ◽  
Masayo Minami ◽  
Yumiko Harigane ◽  
...  

AbstractThe hadal zone at trenches is a unique region where forearc mantle rocks are directly exposed at the ocean floor owing to tectonic erosion. Circulation of seawater in the mantle rock induces carbonate precipitation within the deep-sea forearc mantle, but the timescale and rates of the circulation are unclear. Here we investigated a peculiar occurrence of calcium carbonate (aragonite) in forearc mantle rocks recovered from ~6400 m water depth in the Izu–Ogasawara Trench. On the basis of microtextures, strontium–carbon–oxygen isotope geochemistry, and radiocarbon analysis, we found that the aragonite is sourced from seawater that accumulated for more than 42,000 years. Aragonite precipitation is triggered by episodic rupture events that expel the accumulated fluids at 10−2–10−1 m s−1 and which continue for a few decades at most. We suggest that the recycling of subducted seawater from the shallowest forearc mantle influences carbon transport from the surface to Earth’s interior.


Lithos ◽  
2021 ◽  
Vol 404-405 ◽  
pp. 106427
Author(s):  
Hui-Chao Rui ◽  
Jing-Sui Yang ◽  
Angélica I. Llanes Castro ◽  
Jian-Ping Zheng ◽  
Fei Liu ◽  
...  
Keyword(s):  

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Hong-Yan Li ◽  
Rui-Peng Zhao ◽  
Jie Li ◽  
Yoshihiko Tamura ◽  
Christopher Spencer ◽  
...  

AbstractHow serpentinites in the forearc mantle and subducted lithosphere become involved in enriching the subarc mantle source of arc magmas is controversial. Here we report molybdenum isotopes for primitive submarine lavas and serpentinites from active volcanoes and serpentinite mud volcanoes in the Mariana arc. These data, in combination with radiogenic isotopes and elemental ratios, allow development of a model whereby shallow, partially serpentinized and subducted forearc mantle transfers fluid and melt from the subducted slab into the subarc mantle. These entrained forearc mantle fragments are further metasomatized by slab fluids/melts derived from the dehydration of serpentinites in the subducted lithospheric slab. Multistage breakdown of serpentinites in the subduction channel ultimately releases fluids/melts that trigger Mariana volcanic front volcanism. Serpentinites dragged down from the forearc mantle are likely exhausted at >200 km depth, after which slab-derived serpentinites are responsible for generating slab melts.


2021 ◽  
Vol 7 (28) ◽  
pp. eabf8934
Author(s):  
Changyeol Lee ◽  
YoungHee Kim

A warm slab thermal structure plays an important role in controlling seismic properties of the slab and mantle wedge. Among warm subduction zones, most notably in southwest Japan, the spatial distribution of large S-wave delay times and deep nonvolcanic tremors in the forearc mantle indicate the presence of a serpentinite layer along the slab interface. However, the conditions under which such a layer is generated remains unclear. Using numerical models, we here show that a serpentinite layer begins to develop by the slab-derived fluids below the deeper end of the slab-mantle decoupling interface and grows toward the corner of the mantle wedge along the interface under warm subduction conditions only, explaining the large S-wave delay times in the forearc mantle. The serpentinite layer then allows continuous free-fluid flow toward the corner of the mantle wedge, presenting possible mechanisms for the deep nonvolcanic tremors in the forearc mantle.


2021 ◽  
Vol 14 (2) ◽  
pp. 104-109
Author(s):  
Haipeng Luo ◽  
Kelin Wang

2021 ◽  
Author(s):  
Qasid Ahmad ◽  
Thomas Pettke ◽  
Martin Wille ◽  
Stephan König ◽  
Carolina Rosca ◽  
...  

Lithos ◽  
2021 ◽  
pp. 105941
Author(s):  
Yuji Ichiyama ◽  
Tatsuki Tsujimori ◽  
Patricia Fryer ◽  
Katsuyoshi Michibayashi ◽  
Akihiro Tamura ◽  
...  

Author(s):  
Samuel Angiboust ◽  
Johannes Glodny ◽  
Aitor Cambeses ◽  
Tom Raimondo ◽  
Patrick Monié ◽  
...  
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Lithos ◽  
2020 ◽  
Vol 376-377 ◽  
pp. 105737
Author(s):  
Kuan-Yu Lin ◽  
Kuo-Lung Wang ◽  
Sun-Lin Chung ◽  
Ahmet Feyzi Bingöl ◽  
Yoshiyuki Iizuka ◽  
...  

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