SKARNS ASSOCIATED WITH THE RIZE BATHOLITH, NORTH EАSTERN TURKEY

5th International Scientific Conference - SGEM2005, www.sgem.org, SGEM2005 Conference Proceedings/ ISBN: 954-918181-2, June 13-17, 2005, 15- 30pp

ABSTRACT

According to the mineral compositions, paragenesis, relationships and the fluid inclusion
microthermometry two stages of skarn alteration within the Rize pluton area have been
identified. The first stage (stage I) was characterized by the Spurrite, vesuviavite, wollastonite,
magnetite, pyroxene, gehlenite and garnet assemblages at high temperatures ( 750 oC). The
second stage (II) occurred at lower temperature ( 500 oC) when the system collapsed, and is
characterised by tremolite, low temperature vesuvianite, rustumite, epidote, calcite, apatite,
titanite and hematite. The vesuvianite displays complex zoning due to fluctuations in the
Al+3/Fe+3. The oscillation zones are interpreted to reflect fluid and rock-dominated control of
Fe+3 and Al+3 activities, respectively, and batch-rise or episodic influx of fluid. It is also
concluded that the original magma was so poor in metal complexes (CuCl2, MgCl2, AuCl2, …)
to form any economic deposit. The vesuvianite also acts as an index mineral to follow up the
geochemical changes within the skarn.