An overview of vis-nir-swir field spectroscopy - Spectral International

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________________________________________________________________ The minerals include iron oxide (magnetite and hematite), iron carbonate (siderite and ankerite) and iron silicate (chlorite and amphibole, in particular grunerite and hastingsite). IRON STAGE Figure 66 - The iron stage of alteration shows biotite, iron-chlorite, cummingtonite, ankerite, siderite, hematite, and magnetite. Potassic Alteration The main ore stage is associated with potassium-iron alteration zones in which either sericite (at Olympic Dam and Prominent Hill) or K-feldspar (most common) prevail as the potassic-bearing phase. K-feldspar-biotite-pyrite-chalcopyrite At Olympic Dam, Potassic alteration occurs with hematite, sericite, chlorite, carbonate ± Fe-Cu sulphides ± uraninite, pitchblende and REE (bastnaesite) minerals prevail. It is locally superimposed on a magnetite-biotite alteration (Reynolds, 2000; Skirrow et al., 2002). The intense chloritization destroys the biotite. Quartz, fluorite, barite, carbonate, orthoclase, epidote and tourmaline can also be present. Titanite, monazite, perovskite and rutile may occur. The main uranium mineral is uraninite (pitchblende) with lesser coffinite and brannerite. 52 POTASSIC ALTERATION Figure 67 - Potassic is the most complex of the alteration phases. It includes tourmaline, biotite, iron-chlorite, epidote, REE-carbonate, monazite, muscovite, calcite, hematite, quartz.
________________________________________________________________ Quartz-Tourmaline Alteration The minerals in this suite include tourmaline-magnetite-quartzchalcopyrite-pyrite, chlorite, and chalcopyrite. Quartz-Tourmaline Alteration Figure 68 - Quartz-tourmaline alteration plot with magnetite, quartz, tourmaline, and Fe-chlorite. Albite-Calcite Alteration This phase is post ore - retrograde. The minerals include albite-calcite-bornite-chalcocite and dolomite in quartz veining. 53 Albite-Calcite Figure 69 - Albite-calcite alteration is post-ore and contains calcite, dolomite, and quartz.
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An overview of vis-nir-swir field spectroscopy - Spectral International

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