This paper emphasizes the effect of the dissolution of aluminosilicate during diagenesis may provide more radiogenic strontium which would result in a high content of strontium in carbonate rocks . so we should avoid the vein of carbonate and select the samples with less terrigenous clastic , less grain content and lacking calcite cementation collected as analysis samples . the microcrystalline limestone and micro - to fine - crystalline dolomite are rather fairly whole rock samples 作者还强调了成岩过程中由长石等铝硅酸盐溶解提供壳源sr所造成的碳酸盐矿物成岩蚀变可能表现为较高的sr含量；因此，在用全岩样品进行旨在反映海水组成的各种分析时，应回避碳酸盐脉，选择含陆源碎屑低、颗粒数量少、缺乏方解石胶结物的样品，微晶灰岩或微?粉晶白云岩是较为理想的全岩样品。
We find that the petrology characteristic of all the samples have no characteristic of meteoric water such as geopetal structure , infiltrative sand , ( uniform cement and gravitational cement on base of the research of the dolomite in the regions . on the dot diagram of combination of mgco3 ( mol % ) and sr , the dot are all close to the line of seawater whether they are microlite - crystalline penecontemporaneous dolostone or diagenetic dolostone of various crystals . the 87sr / 86sr value of dolostone or matrix is less than the one of sparry calcite in cave or vein , and close to the value of seawater 通过本区白云岩的研究发现：已有的白云岩样品的岩石学特征没有显示出如示底构造、渗滤沙、新月型胶结物和重力胶结物等大气淡水作用的特征；在白云石mgco _ 3mol百分数和白云石sr含量的投点图中，无论是准同生成因的泥?微晶白云岩，还是粉?细晶(或中晶，或细晶以上的不等晶)的成岩白云岩，均投在海水线的附近；白云岩(或基质)的~ ( 87 ) sr / ~ ( 86 ) sr比值显著低于与孔洞或脉中充填的亮晶方解石，且与海水值十分接近， ~ ( 13 ) c和~ ( 18 ) o值显著高于孔洞或脉中充填的亮晶方解石，也偏向于海水值； mn含量则显著低于孔洞或脉中充填的亮晶方解石。
The results demonstrate that the pingba red residua is a typical in situ chemical weathering crust , and the material sources of the profile are derived from underlying triassic dolomites , the chemical weathering of dolomite can be divided into two stages : " leaching - accumulating trend " and weathering trend " , the stable teconic and whole weathering of dolomite should be the main reason for the development of thick and consecutive red weathering crust overlying dolomite rock in central guizhou 结果显示该剖面是下伏基岩白云岩风化成土并累积的结果，无其他外来物源，是原位风化壳；成土过程具有两阶段模式特征，即白云石、方解石的溶蚀酸不溶物累积和酸不溶物进一步风化两个阶段；长时期的构造稳定和白云岩整体溶蚀作用是黔中地区白云岩风化壳土层厚度大、分布连续的主要制约因素。
We have developed the grain size varies among 2um to 15um grade superfine powder and the yearly output of which comes up to 20 , 000 tons . our products mainly consist of calcite powder , french chalk , active coarse whiting and other jinshi brand series superfine powder , which are welcomed in the more than 10 provinces and districts markets . the company has owned a calcite mine , and the calcite storage capacity has reached to more than 2 million tons 99年公司投资1500万元引进细川德国alpine公司先进超细粉碎分级设备流水生产线，属国内领先水平，开发了粒径为2um - 15um级的超细粉体（年生产量2万吨） ，主要生产方解石粉、滑石粉、硅灰粉、活性重钙等金石牌系列超细粉体，畅销国内10多个省市，产品深受各地用户亲睐。
