Advances in Earth Science ›› 1999, Vol. 14 ›› Issue (2): 168-171. doi: 10.11867/j.issn.1001-8166.1999.02.0168

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WANG Yongqiang ,ZHANG Zhaochong ,XUPeicang ,LIUMinwu

  1. ①Xi’an Institute ofGeology andMineral resources,Chinese Academy ofGeological Sciences,Xi’an 710054,China;②Institute ofGeology,Chinese Academy ofGeological Sciences,Beijing 100037,China
  • Received:1998-07-10 Revised:1998-09-28 Online:1999-04-01 Published:1999-04-01

WANG Yongqiang,ZHANG Zhaochong,XUPeicang,LIUMinwu. AVDANCE IN THE STRUCTURE STUDIES ON SILICATE MELTS[J]. Advances in Earth Science, 1999, 14(2): 168-171.

Three kinds ofways and methods about the studies on structure of silicate melts are introduced in this paper. The main achievements and some problems about the structure of silicate melts are illustrated and pointed out from five research fields of silicate melts, which are molecular polymerization, the structural roles of cations and volatiles, the measurementof physical properties and chemical bonds in quantum chemistry:①“Polymerization model”is an established theory of silicate melts, however, the short quantitative description has not been carried out.②The quantitative determination of polymers in silicate melts is the keyto comprehend the“polymerizationmodel”and the properties of silicate melts quantitatively. If the three methods (TMS, MAS NMR, LR) are performed synthetically, the quantitative
measurement for polymes of silicate melts will be improved.③For the melts with high temperature and high pressure,until nowthere is no insufficient evidence to showthe translation of aluminumfromfour-coordination to six-coordination,or laboratory study aboutthe relation between the forming conditions of silicate melt and itsT-O-Tbond-angel. The above studies are important to understand abnormal viscosity and density change of silicate melts under high-pressure condition.④Two-stage dissolvingmodel of H2O in silicate melt has been put forward, but the quantitative dissolvingmodel of CO2 and other volatileswait for further studies.⑤Split phases are extensively existent in silicate melts, however the relation between split phases and structural stability in silicate melt has not been performed.

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