Metamorphic chemical geodynamics in continental subduction zones

Differentiation of the continental crust by relamination

Laser-ablation split-stream ICP petrochronology

Although the exhumation of high pressure (HP) and ultrahigh pressure (UHP) rocks is an integral process in subduction, it is a transient process, likely taking place during the perturbation in subduction zones. Exhumation of HP to UHP rocks requires the weakening of a subduction channel and the decoupling of the exhumed slice from the rest of the slab. Considering more than 60 occurrences of HP to UHP units of Phanerozic ages, we propose three major types of subduction zones:

/pdf/exhumation-processes-in-oceanic-and-continental-subduction-3x86pri7g2.pdf

Exhumation Processes in Oceanic and Continental Subduction Contexts: A Review

Contrasting styles of Phanerozoic and Precambrian continental collision

New eclogite localities and new 40 Ar/ 39 Ar ages within the Western Gneiss Region of Norway define three discrete ultrahigh-pressure (UHP) domains that are separated by distinctly lower pressure, eclogite facies rocks. The sizes of the UHP domains range from c. 2500 to 100 km 2 ; if the UHP culminations are part of a continuous sheet at depth, the Western Gneiss Region UHP terrane has minimum dimensions of c. 165 · 50 · 5 km. 40 Ar/ 39 Ar mica and K-feldspar ages show that this outcrop pattern is the result of gentle regional-scale folding younger than 380 Ma, and possibly 335 Ma.The UHP and intervening high-pressure (HP) domains are composed of eclogite-bearing orthogneiss basement overlain by eclogite-bearing allochthons. The allochthons are dominated by garnet amphibolite and pelitic schist with minor quartzite, carbonate, calc-silicate, peridotite, and eclogite. Sm/Nd core and rim ages of 992 and 894 Ma from a 15-cm garnet indicate local preservation of Precambrian metamorphism within the allochthons. Metapelites within the allochthons indicate near-isothermal decompression following (U)HP metamorphism: they record upper amphibolite facies recrystallization at 12-17 kbar and c. 750 � C during exhumation from mantle depths, followed by a low-pressure sillimanite + cordierite overprint at c. 5 kbar and c. 750 � C. New 40 Ar/ 39 Ar hornblende ages of 402 Ma document that this decompression from eclogite-facies conditions at 410-405 Ma to mid-crustal depths occurred in a few million years. The short timescale and consistently high temperatures imply adiabatic exhumation of a UHP body with minimum dimensions of 20-30 km. 40 Ar/ 39 Ar muscovite ages of 397-380 Ma show that this extreme heat advection was followed by rapid cooling (c. 30 � C Myr )1 ), perhaps because of

/pdf/discrete-ultrahigh-pressure-domains-in-the-western-gneiss-1v4g9o8wpc.pdf

Discrete ultrahigh-pressure domains in the Western Gneiss Region, Norway: implications for formation and exhumation

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Discrete ultrahigh-pressure domains in the Western Gneiss Region, Norway: implications for formation and exhumation