Hostname: page-component-cd9895bd7-gxg78 Total loading time: 0 Render date: 2024-12-27T03:34:12.235Z Has data issue: false hasContentIssue false
  • English
  • Français

CL for characterizing quartz and trapped fluid inclusions in mesothermal quartz veins: Muruntau Au ore deposit, Uzbekistan

Published online by Cambridge University Press:  05 July 2018

T. Graupner ,
J. Götze ,
U. Kempe  and
D. Wolf
T. Graupner*
Affiliation:
Institute of Mineralogy, Freiberg University of Mining and Technology, Brennhausgasse 14, D-09596 Freiberg, Germany
J. Götze
Affiliation:
Institute of Mineralogy, Freiberg University of Mining and Technology, Brennhausgasse 14, D-09596 Freiberg, Germany
U. Kempe
Affiliation:
Institute of Mineralogy, Freiberg University of Mining and Technology, Brennhausgasse 14, D-09596 Freiberg, Germany
D. Wolf
Affiliation:
Institute of Mineralogy, Freiberg University of Mining and Technology, Brennhausgasse 14, D-09596 Freiberg, Germany
*
*E-mail: [email protected]
Get access Rights & Permissions [Opens in a new window]

Abstract

Combined cathodoluminescence (CL) and transmitted light microscopy were used to characterize quartz from flat and steeply dipping quartz veins and from veinlets in banded host rocks from the giant Muruntau Au quartz vein deposit, Kyzyl Kum Desert, western Uzbekistan. The CL examinations were carried out using a ‘hot-cathode’ CL microscope linked to a highly sensitive digital video camera. The multi-stage deformed flat quartz veins and the steeply dipping hydrothermal formations at Muruntau are characterized by quartz with different CL colours, internal structures and degree of secondary alteration. Primary growth zoning of quartz, indiscernible in conventional polarized light was found to occur only in steeply dipping veins. The bulk of the high-grade Au mineralized ‘central’ quartz veins is dominated by one generation of hydrothermal quartz; intense brecciation of these veins is indicated by the occurrence of fragments of zoned quartz crystals. Primary growth zoning in quartz may be revealed not only by variations in the intensity of blue CL and/or by primary fluid inclusions arranged within the zones, but also by secondary inclusions and recrystallization phenomena developed along boundary surfaces between the zones. Using the results from CL imaging and microstructural analysis of the quartz, fluid inclusions investigated earlier were assigned to genetic types; the evidence of probably primary inclusions is of considerable importance for further studies of the geochemical conditions during vein formation. Considering geological and mineralogical data, CL studies of vein quartz may help to reveal the history of precipitation, deformation and recrystallization processes in the Muruntau Au ore field.

Keywords

cathodoluminescencequartzfluid inclusionsAu ore depositMuruntauUzbekistan
Type
Research Article
Information
Mineralogical Magazine , Volume 64 , Issue 6 , December 2000 , pp. 1007 - 1016
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Alyoshin, A.P. (1994) Evolution of mineralizing solutions and physicochemical characteristics of gold precipitation at the Muruntau deposit (Central Kyzylkum, Uzbekistan). Pp. 444–5 in: Abstracts of the 9th IAGOD Symposium. Beijing, China, 2.Google Scholar
Berger, B.R., Drew, L.J., Goldfarb, R.J. and Snee, L.W. (1994) An epoch of gold riches: The late Palaeozoic in Uzbekistan, Central Asia. SEG Newsletter. 16, 1–11.Google Scholar
Boullier, A.-M. and Robert, F. (1992) Paleoseismic events recorded in Archean gold – quartz vein networks, Val d’Or, Abitibi, Quebec, Canada. J. Struct. Geol., 14, 161–79.CrossRefGoogle Scholar
Channer, D.M.DeR. and Spooner, E.T.C. (1991) Multiple fluid inclusion generations in variably deformed quartz: Hollinger-McIntyre and Kerr Addison-Chesterville Archean Au-bearing vein systems. Ontario Geol. Surv. Misc. Paper. 156, 47–64.Google Scholar
Drew, L.J., Berger, B.R., and Kurbanov, N.K. (1996) Geology and structural evolution of the Muruntau gold deposit, Kyzylkum Desert, Uzbekistan. Ore Geol. Rev., 11, 175–96.CrossRefGoogle Scholar
Golovanov, I.M., Nikolaeva, E.I. and Kazhikhin, M.A. (1988) Integrated Model for the Forecasting and Prospecting of Porphyry Copper Deposits. Fan, Tashkent (in Russian).Google Scholar
Gottstein, G. and Mecking, H. (1985) Recrystallization. Pp. 183-218 in: Preferred Orientation in Deformed Metals and Rocks – an Introduction to Modern Texture Analysis.(Wenk, H.R., editor). Academic Press, New York.Google Scholar
Götze, J., Plötze, M., Fuchs, H. and Habermann, D. (1999) Defect structure and luminescence behaviour of agate – results of electron paramagnetic resonance (EPR) and cathodolumines cence (CL) studies. Mineral. Mag., 63, 149-63.CrossRefGoogle Scholar
Graupner, T., Kempe, U., Spooner, E.T.C., Bray, C.J. and Kremenetsky, A.A. (1999) Characterization of fluids from the giant Muruntau Au-ore field, Uzbekistan, utilizing fluid inclusion microthermometry, volatile and dissolved anion/cation data. Pp. 37–9 in: Mineral Deposits: Processes to Processing. (Stanley, C.J. et al., editors). Balkema, Rotterdam.Google Scholar
Graupner, T., Kempe, U., Spooner, E.T.C., Bray, C.J., Kremenetsky, A.A. and Irmer, G. (2000) Microthermometric, laser Raman spectroscopic, and volatile/ion chromatographic analysis of hydrothermal fluids from the Muruntau Au-quartz vein ore field, Uzbekistan. Econ. Geol. (submitted).CrossRefGoogle Scholar
Kempe, U., Belyatsky, B.V., Kremenetsky, A.A. and Krymsky, R.Sh. (1996) Sm-Nd isotopic characteristics of two different scheelite types from the superlarge Au deposit, Muruntau (Uzbekistan); constraints to age and genesis. Pp. 113–4 in: Abstr. 1st Int. Symp. on Large and Extra-large Deposits of Rare and Precious Metals. St. Petersburg, Russia.Google Scholar
Kempe, U., Monecke, T., Oberthür, Th. and Kremenetsky, A.A. (1999) Trace elements in scheelite and quartz from the Muruntau/Myutenbai gold deposit, Uzbekistan: Constraints on the nature of the ore forming fluids. Pp. 373–6 in: Mineral Deposits: Processes to Processing.(Stanley, C.J. et al., editors). Balkema, Rotterdam.Google Scholar
Kotov, N.V. and Poritskaya, L.G. (1992) The Muruntau gold deposit: its geologic structure, metasomatic mineral associations and origin. Int. Geol. Rev., 34, 77-87.CrossRefGoogle Scholar
Pagel, M., Barbin, V., Blanc, P. and Ohnenstetter, D. (2000) Cathodoluminescence in Geosciences. Springer Verlag, Berlin, Heidelberg, New York.CrossRefGoogle Scholar
Passchier, C.W. and Trouw, R.A.J. (1996) Microtectonics., Springer Verlag, Berlin, Heidelberg, New York.Google Scholar
Perny, B., Eberhardt, P., Ramseyer, K., Mullis, J. and Pankrath, R. (1992) Microdistribution of Al, Li, and Na in alpha-quartz: Possible causes and correlation with short-lived cathodoluminescence. Amer. Miner., 77, 534–44.Google Scholar
Ramseyer, K. and Mullis, J. (1990) Factors influencing short-lived blue cathodoluminescence of alphaquartz. Amer. Miner., 75, 791-800.Google Scholar
Ramseyer, K., Baumann, J., Matter, A. and Mullis, J. (1988) Cathodoluminescence colours of alphaquartz. Mineral. Mag., 52, 669–77.CrossRefGoogle Scholar
Shepherd, T.J., Rankin, A.H. and Alderton, D.H.M. (1985) A Practical Guide to Fluid Inclusion Studies. Blackie and Sons, Glasgow.Google Scholar
Zairi, N.M. and Kurbanov, N.K. (1992) Isotopic-geochemical model of ore genesis in the Muruntau ore field. Int. Geol. Rev., 34, 88-94.CrossRefGoogle Scholar
Zarembo, Yu.G. (1968) Main features of phases of ore formation in the Muruntau deposit (Western Uzbekistan). Voprosy geologii mestorozhdenij zolota i zolotonosnykh rajonov, trudy CNIGRI. 79, 279-290. (in Russian).Google Scholar