China Weekly News
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Reports from T. Usuki and colleagues advance knowledge in geoscience
November 10th, 2009
According to recent research from Taipei, Taiwan, "To constrain the timing of collisional event in the Indochina block, SHRIMP U-Pb dating and REE analyses of zircon were carried out for two paragneiss samples of the Kham Duc Complex, central Vietnam. Both samples contain kyanite, staurolite, and zoisite as relics from an early metamorphic stage (M1), and biotite and sillimanite as major minerals constituting the foliation formed during the late metamorphic stage (M2)."
"The change in mineral assemblages indicates a clockwise P-T path composed of a high- or medium-P + low-T stage (M1) and a subsequent low-P + high-T stage (M2). The U-Pb concordia ages of zircon rims are...
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Source: China Weekly News (2009-11-10)