DBPapers
DOI:10.5593/SGEM2013/BA1.V1/S01.009

GEOCHEMICAL AND MINERALOGICAL ALTERATIONS ASSOCIATED WITH THE HOSTROCKS OF THE KANKOY VOLCANOGENIC MASSIVE SULFIDE (VMS) DEPOSIT (TRABZON, NE-TURKEY)

A. Lermi, E. Ciftci
Monday 5 August 2013 by Libadmin2013

References: 13th SGEM GeoConference on Science and Technologies In Geology, Exploration and Mining, www.sgem.org, SGEM2013 Conference Proceedings, ISBN 978-954-91818-7-6 / ISSN 1314-2704, June 16-22, 2013, Vol. 1, 63 - 70 pp

ABSTRACT

This paper is to investigate alterations of wall rocks in Kanköy deposit. Kanköy deposit
which is a Cu–Zn-Pb type volcanogenic massive sulfide (VMS) deposit, situated in the
western central part of the eastern Pontide tectonic belt. The deposit is hosted
predominantly by tuff, tuff-breccia, and flow-banded breccia of dacite which are all late
cretaceous in age. Samples were systematically collected from surface outcrops, drill
cores and the mineralized zones (accessed through underground workings) and were
studied through petrographical and geochemical analyses. The results showed that the
footwall rocks were variably altered. Alteration mineralogy is usually consisted of three
distinctive zones. The inner zone was characterized by presence of quartz and sericite,
extensively overprinted by kaolinite in places. This zone was graded outward into a
sericite-chlorite and further into chlorite-montmorillonite zones. Mass-change
calculations revealed that Al, Zr, Ti, and Y behaved as the immobile elements during
the alteration and in that felsic footwall rocks gained Fe, Si, Mg, K and ore forming
constituents, respectively. The most characteristic chemical changes near the ore bodies
occurred in Na and Ca contents. They both showed strong depletion, mainly due to
plagioclase destruction by the hydrothermal fluids. Chlorite alteration was manifested
by the replacement of feldspars and a decrease in sericite abundance related to a net
addition of Fe and Mg to the system. The REE contents also varied considerably
depending on mass-change effects related to alteration. On the contrary to the footwall
rocks, mass-changes associated with the hanging wall rocks of the region were
generally much smaller.

Keywords: Kanköy, massive sulfide, hydrothermal alteration, mass-change calculations


PAPER 10.5593/SGEM2013/BA1.V1/S01.009: GEOCHEMICAL AND MINERALOGICAL ALTERATIONS ASSOCIATED WITH THE HOSTROCKS OF KANKOY VOLCANOGENIC MASSIVE SULFIDE (VMS) DEPOSIT (TRABZON, NE-TURKEY)

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