Mineralogy, Geochemistry and Fluid Inclusion Data from the Tumanpınarı Volcanic Rock-Hosted Fe-Mn-Ba Deposit, Balıkesir-Dursunbey, Turkey

Abstract

Abstract:The Tumanpınarı mineralization is a volcanic rock-hosted epithermal Fe-Mn-Ba deposit located in the southwestern part of Dursunbey, Balıkesir, Turkey. The deposit constitutes one of the most important deposits of the Havran-Dursunbey metallogenic sub-province in which numerous Early Miocene Fe-Mn-Ba deposits are distributed. The ore occurs as open-space fillings in faults, fractures, and breccias in the andesite. Early hydrothermal activity was responsible for four types of hypogene alteration in decreasing intensity: silicification, sericitization, hematization and argillic alteration. The mineral assemblage includes pyrolusite, psilomelane, hematite, and barite as well as minor magnetite, manganite, poliannite, limonite, braunite, bixbyite, galena, pyrite, and goethite. Mineralogically, three ore types are recognized as pyrolusite + psilomelane + hematite + barite ore, pyrolusite + psilomelane + poliannite ore and barite + pyrolusite + psilomelane + hematite ore (barite-dominant ore). In addition to Fe, Mn and Ba, the ore contains substantial quantities of Pb, Zn, As. Chemically, the transition from fresh to altered rocks has little effect on the elemental levels for Si, Al, Fe, Ca, Mg, K, Rb, Sr and H 2 O. The homogenization temperature of fluid inclusions hosted in the main stage quartz and barite ranged from 113 to 410 • C with salinities ranging from 0.4 to 14.9 eq. wt % NaCl, respectively. Overall, the available data suggest that the deposits formed as the result of the interaction of two aqueous fluids: a higher-salinity fluid (probably magmatic) and a dilute meteoric fluid.

Magmatic–Hydrothermal Origin of Fe-Mn Deposits in the Lesser Khingan Range (Russian Far East): Petrographic, Mineralogical and Geochemical Evidence

“…The iron-manganese ore in the LKR is also characterized by prominent HFSE depletions (especially, Ta) in primitive mantlenormalized patterns and, with the exception of the Kaylan deposit, general enrichment in LILE with respect to the rare earth elements (Figure 8c,f,i). Uranium enrichments in the Fe-Mn mineralization at the Kostenga and Poperechny deposits (Figure 8c,f) are also indicative of their predominantly hydrothermal origin due to the uptake of uranium by phosphates (monazite, xenotime) and Fe-Mn oxides (for example, hematite) under hydrothermal conditions [137][138][139][140]. Monazite, xenotime, and hematite are common mineral phases in the LKR iron-manganese ores (Figure 5a,b,d,e).…”