SOME RESEARCH ADVANCES ON DETAILED METAM ORPHIC PROCESS IN THE LAST FIVE YEARS
Received date: 2001-03-13
Revised date: 2001-08-22
Online published: 2001-12-01
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 equilibriumdisequilibrium 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.
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 . DOI: 10.11867/j.issn.1001-8166.2001.06.0785
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