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传统观念认为,黄玉是典型的气成热液矿物,黄玉云英岩则是典型的交代蚀变岩.然而,近年来越来越多的地质地球化学依据表明,产于Ta,Nb矿化富F钠长花岗岩顶部的似层状黄玉云英岩具有岩浆成因特征.本文将通过100MPa,6%F含量条件下钠长花岗岩-H_2O-HF体系熔化结晶实验来论证黄玉云英岩岩浆成因的可能性.1 实验方法实验在RQV-快速淬火高温高压实验装置上完成,实验压力为100MPa,温度为840～500℃,温压的测量误差分别为±3℃和±3MPa.实验试样为湖南香花铺钠长花岗岩,化学组成见表1.根据黄玉云英岩含F4%～7%,选择体系F含量6%和固液比(即试样粉末:HF溶液)=4:1(重量比)进行实验,实验初始物按上述比例装入黄金管,焊前焊后,实验前后均通过称量法检查焊封质量.所有实验均在液相线之上840℃恒温24h,产生均一含F和H_2O的熔体,然后
Traditionally, toadstools are considered as typical hydrothermal hydrothermal minerals, while amelobethyanite is a typical metamorphosed alteration rock.However, more and more geo-geochemical evidences in recent years show that the ore-forming minerals enriched in Ta and Nb F stratigraphic topaz-hosted dolostones on the top of F-long granite have the characteristics of magmatic origin.This paper will demonstrate the possible magmatic origin of the magma from the long-granite-H_2O-HF system under the conditions of 100MPa and 6% F .1 Experimental Method The experiment was completed on a RQV-rapid quenching high temperature and high pressure experimental device with the experimental pressure of 100 MPa and the temperature of 840-500 ° C. The measurement errors of the temperature and pressure were ± 3 ° C. and ± 3 MPa, Shop for the long granite, the chemical composition shown in Table 1. According to the yellow Yu Yunying rock containing F4% ~ 7%, select the system F content 6% and solid-liquid ratio (ie, sample powder: HF solution) = 4: 1 (weight ratio) The experiments were carried out, the initial material of the experiment was loaded into the gold tube according to the above ratio, the welding quality was checked before and after the welding by the weighing method before and after the experiment.All the experiments were carried out at a constant temperature of 840 ℃ for 24h, H 2 O melt, then