Kalinichenko Е.А., Brik А.B., Kalinichenko А.М., Yushin A.A.
M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the National Academy of Sciences of Ukraine
Language: Ukrainian
Geochemistry and ore formation 2016, 37: 65-73
https://doi.org/10.15407/gof.2016.37.065
The contents of different water forms (Н2О, ОН-groups and others) in the quartz of a row of deposits had been fulfilled, using the methods of nuclei magnetic resonance (NMR) on 1Н, 23Na and 27Al and X-ray diffraction. The quartz samples of different types from thе gold ore deposits of Muruntay , Allah-Yun and Onoch-Allah, Baley , Aksy , Berezivske, Dj-Katu, from deposits and ore manifestations of Ukraine (from the Krivoy Rog zone and from the different crossings of the Klinzi gold ore zone). Quartz samples from polymetallic ores (Sadon-Zgid, Chukotka), in that gold is practically absent, had been investigated additionally. The contents of water in inclusions (Н2Оinc molecules) and ОН-groups in the quartz of different gold ore deposits were found by the 1Н NMR method. The amount of the gas-liquid inclusions and their sizes in investigated samples differ substantially , what temperature dependences of Н2Оinc molecules content specify on. The practically linear dependence between intensities of the 1Н NMR component caused by ОН-groups and the 27Al NMR component caused by AlIV in mica was established for the quartz samples, which 1Н NMR spectra demonstrate two components – due to Н2Оinc molecules and ОН-groups. This allowed to conclude the sericite type of ОН- groups that is, these groups are contained in sericite. It is shown that 23Na and 27Al NMR data allow to establish the type of sericite impurities – muscovite-like or paragonite-like which content does not exceed the few parts percent. It is demonstrated that the quartz of gold ore deposits can be divided into three types, taking into account the content of different forms of water. The first type quartz has Н2Оinc molecules and ОН- ОН-groups of sericite type that specifies on the hydrothermal process following sericiting containing feldspars, quartz – sericite metasomatose. The second type quartz has Н2Оinc molecules mainly , in default or with the negligible amount of ОН-groups of sericite type or other types that specifies on other type of the hydrothermal process. The content Н2Оinc molecules in the third type quartz does not exceed 0,01 wt% or they are absent, groups of sericite type or other type may be present or absent, that specifies on the insignificant hydrothermal process. It is established that the most of investigated quartz samples of gold ore deposits are the second type quartz, the less of the samples – the first type quartz and yet less than – the third type quartz. It is supposed, that metasomatose of the Klinzi gold ore deposit was similar to other deposits, but with considerably less intensity: the Baley-like quartz – sericite metasomatose was in near ore zone, the Muruntay-like metasomatose was in the ore zone. The data for quartz from cross quartz tendons of Muruntay deposit specify on a presence, on a less measure, two quartz generations. Quartz in the first generation is saturated by Н2Оinc molecules, water is absent in quartz of the second generation, that correlates with a well-known thesis about a multistage ore forming on this deposit. The formation temperatures of quartz from the deposits of Muruntay , Baley and Klinzi have been estimated on the basis of the NMR data. The obtained values correlate well with the well-known estimations of hydrotherm temperatures of these deposits and the temperatures of low tem- perature metasomatose (250-400 °С).
Key words: quartz, gold ore deposits, nuclei magnetic resonance, X-ray diffraction, hydrothermal processes.
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