Experimental Study on the Stability of Hydrous Minerals in Natural Pelitic System

LI Ying; TANG Hong-Feng; LIU Cong-Qiang; ZHOU Zhi-Hua

doi:10.11858/gywlxb.2006.03.006

Volume 20 Issue 3

Apr 2015

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Chinese Journal of High Pressure Physics > 2006 > 20(3): 257-264 .

LI Ying, TANG Hong-Feng, LIU Cong-Qiang, ZHOU Zhi-Hua. Experimental Study on the Stability of Hydrous Minerals in Natural Pelitic System[J]. Chinese Journal of High Pressure Physics, 2006, 20(3): 257-264 . doi: 10.11858/gywlxb.2006.03.006

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LI Ying, TANG Hong-Feng, LIU Cong-Qiang, ZHOU Zhi-Hua. Experimental Study on the Stability of Hydrous Minerals in Natural Pelitic System[J]. Chinese Journal of High Pressure Physics, 2006, 20(3): 257-264 . doi: 10.11858/gywlxb.2006.03.006

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Experimental Study on the Stability of Hydrous Minerals in Natural Pelitic System

doi: 10.11858/gywlxb.2006.03.006

1.
Laboratory for Study of the Earth's Interior and Geofluids Institute of Geochemistry, Chinese Academy of Science, Guiyang 550002, China;
2.
Graduate School of Chinese Academy of Sciences, Beijing 100039, China

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Corresponding author: LI Ying
Received Date: 30 Sep 2005
Rev Recd Date: 12 Jan 2006
Publish Date: 05 Sep 2006

Abstract

Abstract

Metamorphic dehydration of subducted sediments is of importance in understanding the composition of slab-derived fluids, the mineral and isotope composition in subduction zone, which is also important for understanding the evolution of arc magmas. The stability of chlorite, sericite, amphibole and biotite has been identified in natural pelitic system at pressures 1.5~3.5 GPa, and at temperatures 746~930 ℃ by high pressure experiments on natural pelite. The systematic diagram suggests that with the increasing of pressure and temperature chlorite completely decomposes at lower depth 50 km. The run production of this process-amphibole can be subducted to 85 km, and biotite devolatilizes at the depth 120 km in subduction zone. This leads to the conclusion that subducted sediments can be subducted into more deep depth (120 km) than basaltic oceanic crust.
- subduction zone,
- pelite,
- hydrous mineral,
- metamorphic dehydration

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References(43)

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Experimental Study on the Stability of Hydrous Minerals in Natural Pelitic System

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