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利用岩石化学成分计算花岗岩类实际矿物的新方法
A new method for calculating actual minerals of granitoids by using chemical components of rocks
投稿时间:2017-05-15  修订日期:2019-11-20
中文关键词:岩石化学成分  算法  实际矿物  标准矿物  花岗岩类
英文关键词:petrochemical components  calculation method  actual minerals  normative minerals  granitoids
基金项目:中国核工业地质局铀矿地质科研项目(201807-03,201807)
作者单位
王凤岗 核工业北京地质研究院, 中核集团 铀资源勘查与评价技术重点实验室, 北京 100029 
戎嘉树 核工业北京地质研究院, 中核集团 铀资源勘查与评价技术重点实验室, 北京 100029 
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中文摘要:
      介绍一种在三氏算法(戎嘉树等人于20世纪70年代初提出的一种用岩石化学成分计算花岗岩类实际矿物含量的方法)的基础上经长期实践并不断创新而发展起来的一种新的实际矿物含量的计算方法。该方法针对准铝质花岗岩类、铝过饱和、铝强过饱和花岗岩类分别设计了相应的计算方法,同时也兼顾了碱交代花岗岩及碱长花岗岩,不仅适用于新鲜岩石,也适用于部分蚀变的岩石。该方法在处理岩石化学分析数据的归纳和组合上尽量与实际存在的矿物相结合,力求计算结果与岩石中实际存在的矿物相符。计算过程中提出了长石的修正系数χ,用其修正岩石中钾长石和斜长石的含量,从而确保计算结果与实际相符。计算得到主要造岩矿物(Q、Or、Pl、Bi、Ms、Hb)的含量和反映岩石化学特征的两类参数(Ot、AnPl、K-Na、ab、Mg)及相关图解。该方法不仅可以计算出岩石中主要造岩矿物的含量,同时还可以反映岩石化学特征、演化过程及其成矿专属性等。
英文摘要:
      The petrochemical method proposed in this paper is a new method developed through long-term practice and continuous innovation on the basis of Sansi algorithm, a petrochemical method to calculate the actual mineral content of granitoids from the chemical composition of rocks, which was put forward by Rong Jiashu in the 1970s. It designs corresponding calculating method for quasi-aluminous granitoids, aluminum supersaturated granitoids and aluminum strongly supersaturated granitoids, and simultaneously considers alkali metasomatic granites (or alkali feldspar granites). It is applicable not only to fresh rocks but also to partly altered rocks. This method is combined with the actual minerals as much as possible in dealing with the induction and assemblage of petrochemical analysis data and aims to make the calculation result consistent with the actual minerals in the rocks. The calculation process puts forward the correction coefficient χ of feldspar, which may correct the content of potassium feldspar and plagioclase in the rocks and ensure that the calculated results are consistent with the actual situation. Two kinds of parameters and related diagrams are obtained through the calculating results, one representing the percent content of the main forming minerals, such as Q, Or, Pl, Bi, Ms and Hb, the other reflecting the chemical characteristics of rocks, such as Ot, AnPl, K-Na, a, b and Mg. This method can not only calculate the content of the main rock-forming minerals but also reflect the petrochemical characteristics, evolution process and metallogenic specificity.
王凤岗,戎嘉树,2020,利用岩石化学成分计算花岗岩类实际矿物的新方法[J].岩石矿物学杂志,(1):129~140.
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