Researchers have discovered microdiamonds in the Nishisonogi metamorphic rock formation in Nagasaki Prefecture, Japan. Microdiamonds in metamorphic rocks are important minerals because they form in ...
The oldest blueschists—metamorphic rocks formed during subduction—are of Neoproterozoic age 1, and 0.7–0.8 billion years old. Yet, subduction of oceanic crust to mantle depths is thought to have ...
a: Geological zone in western Japan. The blue-green part is the Sanbagawa belt that crosses mainland Japan. The Nishisonogi metamorphic rock was thought to belong to the same geological formation as ...
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