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  -quartz
Migration Paths of Helium in α-Quartz and Vitreous Silica from Molecular Dynamics Data
      
The helium diffusion in α-quartz and vitreous silica is studied by the molecular dynamics method.
      
The helium diffusion in α-quartz and vitreous silica is described.
      
Empirical relationships describing the composition dependences of the chemical durability of glasses in the diopside-albite, diopside-anorthite, diopside-orthoclase, diopside-quartz, and diopside-feldspar systems are derived.
      
A detailed examination of the experimental and model ARDFs has revealed that the interatomic distances for all atoms belonging to one helical chain in the glass are identical to those in the β-quartz crystal over the entire ordering range.
      
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This paper accounted varied parameters and characteristics of fluid incl- usions in quartz of the Xiaoqinling gold deposit,and discussed the geological meaning of these parameters.Through studies,the authors considered:there may be a genetic relationship between the Xiaoqinling gold deposit and the Huashan and Wenyu granites;the trend of the temperature changes of regional gold-quartz veins in vertical extent may reflect the regularities of gold mineralization varying with elevation;mineral compositions of quartz...

This paper accounted varied parameters and characteristics of fluid incl- usions in quartz of the Xiaoqinling gold deposit,and discussed the geological meaning of these parameters.Through studies,the authors considered:there may be a genetic relationship between the Xiaoqinling gold deposit and the Huashan and Wenyu granites;the trend of the temperature changes of regional gold-quartz veins in vertical extent may reflect the regularities of gold mineralization varying with elevation;mineral compositions of quartz veins:degrees of gold mineralization and the place where gold orebodies occur may have internal relation with the changes in ore-forming temperatures;the wave amplitude ratios (wavelength/wave crest) of the decrepitation frequency curve during α-β quartz inversion,optical densities be- tween quartz and different fillings in fluid inclusions may indicate the degree of gold mineralization in quartz veins;componential ratios of the internal vapour fac- ies in fluid inclusions may indicate the positions of orebodies;the matter in fluid inclusions may indicate the source of ore-forming materials and physical-chemical conditions of ore-formation.This paper is an example of applying the decrepition mathod to ore deposit studies,and also a preliminary summation of studies on fluid inclusions in quartz of the Xiaoqinling gold deposit.

本文叙述了小秦岭金矿石英中气液包裹体的特征及各种参数,并探讨了各种参数的地质意义。通过研究认为:小岭秦金矿与华山花岗岩和文峪花岗岩可能有成因上的联系;区域含金石英脉垂直方向上温度的变化趋势,可能反映了金矿化标高的规律性;石英脉体的矿物组合、金矿化的强弱及金矿的赋存位置与成矿温度的变化有内在联系;α—石英转变为β石英时的爆裂频度曲线波幅比(波长/波高)值和石英与气液包裹体中的不同充填物间的相对光密度,可以指示石英脉中金矿化的好坏;气液包裹体的内部气相成份比值可以指示矿体部位;气液包体成分可以指示成矿物质来源和成矿时的物理化学条件。本文是目前关于爆裂测温方法在矿床研究中应用的一个实例,也是小秦岭金矿石英中气液包裹体研究的初步结总。

This paper deals with the material source and process of formation of tonsteins mainly on the basis of distribution, occurrence, texture, structure, and material composition. Tonsteins of volcanic origin arc exceedingly widely distributed in our country. They were found in the Inner Mongolia, Shaanxi, Shanxi, Hcbei, Shandong in Northern China and wide areas of coal fields in Southwest China.Tonsteins are commonly developed in coal measures of Carboniferous-Permian and stable in horizon.They occur as thin beds...

This paper deals with the material source and process of formation of tonsteins mainly on the basis of distribution, occurrence, texture, structure, and material composition. Tonsteins of volcanic origin arc exceedingly widely distributed in our country. They were found in the Inner Mongolia, Shaanxi, Shanxi, Hcbei, Shandong in Northern China and wide areas of coal fields in Southwest China.Tonsteins are commonly developed in coal measures of Carboniferous-Permian and stable in horizon.They occur as thin beds less than 1m (some only 0.02 ± m.) in thickness but their thickness keep constant in thousands of km2, so they may be used as isochronous correlative horizons.

本文根据高岭岩的分布、产状、厚度、层位的稳定性和成分的单一性,特别是少量残余的β石英、高透长石和锆石等原生矿物组合及其标型特征和痕量元素的含量,论证高岭岩的物源,并探讨其形成过程.

The oxygen-shared volume of a framework silicate mlneral (V_o value) iscalculated to be: V_o=V(the unit-cell volume)/∑_o(the total number of oxygen and water in the unit cell) In this paper a new concept, the structural function, is introduced by theauthors, It is defined as: f(s) (structural function)=sub from m to (m×r)/∑_o×R_t/0.39×T/T+Si, where m, r and e are the number, radius and valence, respectively, of the non-framework cation, R_t is the radius of the cation T substituting for siliconT/(T+Si) is the...

The oxygen-shared volume of a framework silicate mlneral (V_o value) iscalculated to be: V_o=V(the unit-cell volume)/∑_o(the total number of oxygen and water in the unit cell) In this paper a new concept, the structural function, is introduced by theauthors, It is defined as: f(s) (structural function)=sub from m to (m×r)/∑_o×R_t/0.39×T/T+Si, where m, r and e are the number, radius and valence, respectively, of the non-framework cation, R_t is the radius of the cation T substituting for siliconT/(T+Si) is the occupancy of T, and 0.39A is the radius of Al~(3+). The V_o values of framework silicate minerals are linearly correlated withtheir structural functions, i.e.; V_o=a+bf (s),where a and b are constants for a certain structural type of framework silica-tes, and a corresponds to the V_o value of a certain silica polymorph. V_o=16. 52+151. 0f(s) r=0.989 (feldspar group) V_o=21. 59+20. 10f(s) r=0.947 (tridymite group) V_o=20. 18+29. 81f(s) r=0.92 (β-quartz group) V_o=21. 49+48. 17f(s) r=0.951 (leucite group) Though zeolitic minerals contain much water, their V_o values do not incr-ease, the mean value being 22. 25 A~3 with б_(n-1)=0. 82 A~3, which is approximatelythe same as that of silica glass.

架状硅酸盐的氧平均体积与晶体结构有如下关系:V_o=a+bf(s)。对于每种结构类型而言,a和b是常数。f(s)是结构函数,它取决于离子半径、离子电价以及类质同象替代关系。文中给出了长石型、白榴石型、鳞石英型以及β石英型架状硅酸盐的V_0与结构函数之间的定量关系。沸石中虽含有大量水,但其V_o并未增大,平均值为22.25A~3,标准方差σ_(n-1)=0.82A~3,与石英玻璃V_o值近于相等。

 
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