Geochemistry & Mineralogy of Manganese Mining IndexesIn Abadeh-e-Tashk Area, Fars Province

Category Economic geology & mineral exploration
Group GSI.IR
Location 21th symposium on geosciences
Holding Date 21 May 2008

Abstract:
      Five manganese deposits, which are always associated with radiolarian cherts and occur discontinuously with ophiolitic masses, were studied from Abadeh-e-Tashk area, Fars province. The sequence which forms colored melange is a part of Neyriz ophiolite. Close association of manganese-rich rock units with the chert masses, basalts and pelagic limestone along with wet chemical and XRF analyses indicate that the deposits were formed in an exhalative hydrothermal environment on the deep sea floor. Microscopic and XRD investigations show that Braunite is predominant phase. Bixbyite is present as minor phase. High metamorphic manganese minerals are absent. This paper reveals the first report on auororite and rancieite, the rare supergene minerals, from Iranian manganese deposits. The accompaniment between pyrolusite and the two last minerals along with colloform and open space filling textures, show that high oxidant superficial fluids influenced intensively the primitive Mn compounds.

General:
     Five manganese deposits, which are always associated with radiolarian cherts and occur discontinuously with ophiolitic masses, were studied from Abadeh-e-Tashk area, Fars province. The sequence which forms colored m鬡nge is a part of Neyriz ophiolite. Close association of manganese-rich rock units with the chert masses, basalts and pelagic limestone along with wet chemical and XRF analyses indicate that the deposits were formed in an exhalative hydrothermal environment on the deep sea floor. Microscopic and XRD investigations show that Braunite is predominant phase. Bixbyite is present as minor phase. High metamorphic manganese minerals are absent. This paper reveals the first report on auororite and rancieite, the rare supergene minerals, from Iranian manganese deposite. The accompaniment between pyrolusite and the two last minerals along with colloform and open space filling textures, show that high oxidant superficial fluids influenced intensively the primitive Mn compounds.

tags: FARS