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首页> 外文期刊>Mineralogical Magazine >The occurrence, detection and significance of moganite (SiO_2) among some silica sinters
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The occurrence, detection and significance of moganite (SiO_2) among some silica sinters

机译：某些二氧化硅烧结矿中褐铁矿（SiO_2）的发生，检测及意义

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摘要

Moganite, monoclinic SiO_2, is a component of microcrystalline, quartz-bearing, sinters of New Zealand derived from crystallization of non-crystalline and paracrystalline opaline silicas. It occurs at levels of <13 vol. percent of the SiO_2 phases present in sinters between 20,000 and 200,000 y old but is generally either absent or below the level of detection in Tertiary sinters. Unambiguous identification of moganite is most readily accomplished by laser Raman spectroscopy; the technique allows individual microtextural elements of a sinter's fabric to be analysed. Conventional scanning X-ray powder diffraction procedures are limited in their ability to discern the characteristic moganite diffraction lines from the very similar quartz pattern, especially in those samples where moganite is at low concentration and/or unanticipated. However, powder diffraction, using a position-sensitive detector system, allows not only the identification of the moganite pattern in the presence of a large proportion of quartz, but also semiquantitative estimates of the different silica phases present in bulk sinter samples of approx 450 mg. Moganite is part of the sinter maturation sequence. It occurs as a metastable phase that will ultimately transform to quartz, given sufficient time or a change in ambient conditions.
机译：莫根石，单斜SiO_2，是新西兰的微晶含石英烧结矿的一种成分，是由非结晶和准结晶的不透明硅石的结晶形成的。它发生在<13 vol。 20,000年至200,000年之间的烧结矿中存在着5％的SiO_2相，但通常不存在或低于第三级烧结矿中的检测水平。通过激光拉曼光谱最容易实现对锰铁矿的明确鉴定。该技术可以分析烧结矿织物的各个微观结构元素。常规的扫描X射线粉末衍射方法从非常相似的石英图案中分辨出特征性的锰矿衍射线的能力受到限制，尤其是在那些锰矿浓度低和/或未预料到的样品中。但是，使用位置敏感检测器系统进行粉末衍射，不仅可以识别大量石英存在下的锰铁矿模式，还可以对大约450 mg散装烧结矿样品中存在的不同二氧化硅相进行半定量估算。 。锰铁矿是烧结成熟过程的一部分。如果有足够的时间或环境条件发生变化，它会以亚稳相的形式出现，最终会转变为石英。

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