scholarly journals Boron Cycling in Subduction Zones

Elements ◽  
2017 ◽  
Vol 13 (4) ◽  
pp. 237-242 ◽  
Author(s):  
Martin R. Palmer
Keyword(s):  
Isotopic Composition ◽  
Subduction Zones ◽  
Accretionary Prism ◽  
Crustal Material ◽  
Seawater Chemistry ◽  
Ocean Island ◽  
Ocean Island Basalts ◽  
Ideal Tracer

Subduction zones are geologically dramatic features, with much of the drama being driven by the movement of water. The “light and lively” nature of boron, coupled with its wide variations in isotopic composition shown by the different geo-players in this drama, make it an ideal tracer for the role and movement of water during subduction. The utility of boron ranges from monitoring how the fluids that are expelled from the accretionary prism influence seawater chemistry, to the subduction of crustal material deep into the mantle and its later recycling in ocean island basalts.

scholarly journals The stable strontium isotopic composition of ocean island basalts, mid-ocean ridge basalts, and komatiites

2018 ◽  
Vol 483 ◽  
pp. 595-602 ◽  
Author(s):  
Elsa Amsellem ◽  
Frédéric Moynier ◽  
James M.D. Day ◽  
Manuel Moreira ◽  
Igor S. Puchtel ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
Ocean Island ◽  
Ocean Island Basalts ◽  
Mid Ocean Ridge ◽  
Stable Strontium ◽  
Ocean Ridge

Os isotopic composition of western Aleutian adakites: Implications for the Re/Os of oceanic crust processed through hot subduction zones

2021 ◽  
Vol 292 ◽  
pp. 452-467
Author(s):  
Rachel Bezard ◽  
Simon Turner ◽  
Bruce Schaefer ◽  
Gene Yogodzinski ◽  
Kaj Hoernle
Keyword(s):  
Isotopic Composition ◽  
Oceanic Crust ◽  
Subduction Zones

scholarly journals Up the down escalator: the exhumation of (ultra)-high pressure terranes during on-going subduction

2012 ◽  
Vol 4 (1) ◽  
pp. 745-781 ◽  
Author(s):  
C. J. Warren
Keyword(s):  
High Pressure ◽  
Subduction Zone ◽  
Continental Crust ◽  
Subduction Zones ◽  
Crustal Material ◽  
Time And Space ◽  
Ultra High Pressure ◽  
Tectonic Environment ◽  
Tectonic Style ◽  
Weak Material

Abstract. The exhumation of high and ultra-high pressure rocks is ubiquitous in Phanerozoic orogens created during continental collisions, and is common in many ocean-ocean and ocean-continent subduction zone environments. Three different tectonic environments have previously been reported, which exhume deeply buried material by different mechanisms and at different rates. However it is becoming increasingly clear that no single mechanism dominates in any particular tectonic environment, and the mechanism may change in time and space within the same subduction zone. In order for buoyant continental crust to subduct, it must remain attached to a stronger and denser substrate, but in order to exhume, it must detach (and therefore at least locally weaken) and be initially buoyant. Denser oceanic crust subducts more readily than more buoyant continental crust but exhumation must be assisted by entrainment within more buoyant and weak material such as serpentinite or driven by the exhumation of structurally lower continental crustal material. Weakening mechanisms responsible for the detachment of crust at depth include strain, hydration, melting, grain size reduction and the development of foliation. These may act locally or may act on the bulk of the subducted material. Metamorphic reactions, metastability and the composition of the subducted crust all affect buoyancy and overall strength. Subduction zones change in style both in time and space, and exhumation mechanisms change to reflect the tectonic style and overall force regime within the subduction zone. Exhumation events may be transient and occur only once in a particular subduction zone or orogen, or may be more continuous or occur multiple times.

scholarly journals Episodic entrainment of deep primordial mantle material into ocean island basalts

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Curtis D. Williams ◽  
Mingming Li ◽  
Allen K. McNamara ◽  
Edward J. Garnero ◽  
Matthijs C. van Soest
Keyword(s):  
Mantle Material ◽  
Ocean Island ◽  
Ocean Island Basalts
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