Ultrahigh-pressure (4.5–5.5 GPa) experimental research on pyroxene-garnet transition and its significance |
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Authors: | Qicheng Fan Ruoxin Liu Hongsen Xie Yueming Zhang Zhuoran Lin |
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Institution: | (1) Institute of Geology, State Seismological Bureau, 100029 Beijing, China;(2) Institute of Geochemistry, Chinese Academy of Sciences, 550002 Guiyang, China |
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Abstract: | Conclusions The transition from natural Al-enstatite to garnet and Al-poor pyroxene has taken place under the condition of about 1000°C
and 4.5–5.5 GPa, and new phases of garnet and corundum have formed when 15% Al2O3 was added to the initial natural Al-enstatite. This experimental result has explained the ultrahigh pressure (3.5–5.0 GPa)
and relatively low temperature (< 1000°C) genesis of the ultramafic rock of high-pressure metamorphic zone in Dabieshan-northern
Jiangsu-Jiaodong and of red corundum garnetite coexisting with garnet peridotite. From the genetic mineralogy, petrology andP-T equilibrium conditions of garnet peridotite of the high-pressure metamorphic zone, kimberlite and Cenozoic basalt and the
ultrahigh pressure experimental result, it is inferred that the upper mantle garnet peridotite is transformed with the increase
of depth from Al-rich pyroxene garnet peridotite (80–120 km) to Al-poor pyroxene garnet peridotite (greater than 120–150 km). |
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Keywords: | pyroxene-garnet transition ultrahigh-pressure experiment garnet peridotite genesis |
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