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首页> 外文会议>23rd New Zealand Geothermal Workshop 2001, 2001, Auckland >THE DETECTION AND SIGNIFICANCE OF MOGANITE IN PLIOCENE SINTER AT PLUMDUFF, NORTHLAND
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THE DETECTION AND SIGNIFICANCE OF MOGANITE IN PLIOCENE SINTER AT PLUMDUFF, NORTHLAND

机译：北地PLUMDUFF的二茂新石烧结矿中锰矿的检测及意义

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摘要

Raman spectral microsampling, from 100-600 cm~(-1), of clean slabs of Pliocene breccias show moganite, monoclinic SiO_2, is disseminated through the Plumduff sinter, that otherwise consists predominantly of microcrystalline quartz. Moganite forms as a metastable phase during the recrystallisation of the sinter from opal-CT and opal-C to quartz and these are the oldest sinters in New Zealand in which moganite has been recognised. The distribution of moganite is uneven e.g. it is absent from recrystallised examples of palisade, tufted network, finely laminated, peloidal and plant-rich primary sinter textures but is present in both fenestral network and columnar types. Its distribution reflects heterogeneity of process that has affected the outcrop since development of the initial sinter apron e.g. hydrothermal activity and weathering. The rapidity of Raman analysis and its ability to microsample individual textural elements allow the twin paths of mineralogical and textural maturation of sinters to be mapped together.
机译：在上新世角砾岩的干净平板上从100-600 cm〜（-1）进行的拉曼光谱显微采样显示，通过Plumduff烧结矿散布了莫根石，单斜SiO_2，否则它主要由微晶石英组成。从欧泊-CT和欧泊-C到石英的重结晶过程中，蒙脱石形成为亚稳相，这是新西兰公认的最古老的烧结矿。锰矿的分布不均匀，例如栅栏，簇状网络，精细层压的，倍性的和富含植物的初生烧结组织的重结晶实例中不存在，但同时存在于Fenestral网络和柱状类型中。它的分布反映了自最初的烧结围裙发展以来影响露头的过程的异质性，例如热液活动和风化作用。拉曼分析的快速性及其对单个纹理元素进行微采样的能力，使烧结矿的矿物学和纹理成熟的双路可以映射在一起。

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