Advances in Earth Science ›› 2001, Vol. 16 ›› Issue (6): 785-794. doi: 10.11867/j.issn.1001-8166.2001.06.0785

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WU Chunming,GENG Yuansheng   

  1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
  • Received:2001-03-13 Revised:2001-08-22 Online:2001-12-20 Published:2001-12-01

WU Chunming,GENG Yuansheng. SOME RESEARCH ADVANCES ON DETAILED METAM ORPHIC PROCESS IN THE LAST FIVE YEARS[J]. Advances in Earth Science, 2001, 16(6): 785-794.

In the past five years, some research advances of detailed metamorphic process is reviewed, in the following aspects:(1)chemical zoning and chemical gradient of metamorphic minerals on mm-μm scales were carefully investigated;(2)it was discovered that different elements of minerals have different abilities in resisting post-peak cooling;(3)singular value decomposition (SVD) was adopted to quantitatively judge mass equilibrium relationships, and later, to decipher the equilibriumdisequilibrium thermodynamic relationships, between assemblages of minerals;(4)the original chemical composition of minerals involved in post-peak decomposition or net transfer reaction was tried to regain;(5)the concept and method of high precision relative geothermobarometry, which is not dependent on thermochemical data or activity-composition relations of minerals involved, was developed;(6)compensation law was introduced to geospeedometry, and thus the cooling rate-time relation may be directly displayed;(7)the newly developed technique of M-ssbauer milliprobe was used to determine in situ Fe3+ contents of minerals in an area as small as 50×30 μm2;(8)LP-ICPMS, 40Ar/39Ar laser-probe, electron microbe, and secondary ion mass spectrometry (SIMS) were developed to determiner in situ radioactive ages of minerals, thus continuous dating of a complete metamorphic process is possible. In the near future, the following work should be done: (a) to refine and adopt the advanced methods and instruments mentioned above, in order to investigate the various aspects and determine the speed of metamorphism;(b)to study on and summarize the characteristics of metamorphism of rocks from different tectonic terranes; (c) to do a great number of reversed equilibrium experiments on minerals, and derive high-precision thermochemical data, and to have better understanding of mixing properties of the relevant minerals;(d)to model the metamorphic process via petrological experiments, and to provide insights into metamorphic dynamics.

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