Olivine, June 2023, Vol. 19, No. 3
June 28, 2024
Elements Joint Society Calendar (2025–2026)
July 17, 2024
Metamorphic Duality in SW Japan—The Sanbagawa-Ryoke Classic Example of Paired Metamorphism, April 2024, Vol. 20, No. 2
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Subduction, where one plate dives beneath another, controls longterm wholeEarth cycling of rocks, fluids and energy. Plates subduct faster than they heat up, making them the coldest parts of the Earth’s interior.
Metamorphic Duality in SW Japan—The Sanbagawa-Ryoke Classic Example of Paired Metamorphism
April 2024, Vol. 20, No. 2
Subduction, where one plate dives beneath another, controls longterm wholeEarth cycling of rocks, fluids and energy. Plates subduct faster than they heat up, making them the coldest parts of the Earth’s interior. Fluids released from these cold plates rise into hotter overlying rocks forming magma that feeds surface volcanism. Cold deep conditions associated with subduction complemented by hot shallow conditions under volcanic arcs are reflected in the presence of pairs of metamorphic belts representing sites of ancient subduction—the Cretaceous SanbagawaRyoke metamorphic pair of Japan is a premier example. Estimates of pressure, temperature, the age and duration of metamorphism, and the tectonic framework in which metamorphism took place help us develop quantitative models both for the evolution of SW Japan and subduction systems in general.
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