THE EVOLUTION OF ORE-FORMING FLUIDS AND GENESIS OF NUKEH IRON DEPOSIT, NORTH SEMNAN BASED ON EVIDENCE FROM FLUID INCLUSIONS AND S, C, O STABLE ISOTOPES

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ESMAILNEZHAD S.; TAGHIPOUR N.; HASSANNEZHAD A.A.

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Journal: GEOSCIENCES Year:2017 | Volume:26 | Issue:103 Page(s): 309-322

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Title

THE EVOLUTION OF ORE-FORMING FLUIDS AND GENESIS OF NUKEH IRON DEPOSIT, NORTH SEMNAN BASED ON EVIDENCE FROM FLUID INCLUSIONS AND S, C, O STABLE ISOTOPES

Author(s)

ESMAILNEZHAD S. | TAGHIPOUR N. | HASSANNEZHAD A.A. | Issue Writer Certificate

Keywords

FLUID INCLUSIONSQ1

STABLE ISOTOPEQ2

NUKEH IRON DEPOSITQ1

SEMNANQ2

Abstract

The NUKEH IRON DEPOSIT is situated at the north of SEMNAN and at south of Central Alborz structural zone. Volcano-pyroclastic rocks with Eocene age are the host of this deposit. Iron mineralization occurs as massive, disseminated, vein and breccia types in the Nukeh deposit and magnetite, hematite, pyrite, chalcopyrite, garnet, epidote, quartz and calcite are the main minerals in this deposit. FLUID INCLUSIONS and STABLE ISOTOPEs (O, C, S) have been used to reveal the physico-chemical characteristics of hydrothermal fluids and genesis of the Nukeh Fe deposit. Seven types of FLUID INCLUSIONS are identified in quartz, according to the phase numbers, which include, liquid inclusions (L), liquid-rich inclusions (L+V), vapor-rich inclusions (V+L), vapor inclusions (V), simple brine inclusions (L+V+S), halite-bearing liquid inclusions (L+S) and opaque-bearing liquid-rich inclusions (L+V+O). The ranges of homogenization temperature and salinity of liquid-rich FLUID INCLUSIONS in quartz are 100-200oC and 10-20 wt. % NaCl equivalent, respectively, whereas the ranges of homogenization temperature and salinity of vapor-rich FLUID INCLUSIONS are 350-500oC and 10-30 wt. % NaCl equivalent, respectively. Also homogenization temperature and salinities of liquid-rich FLUID INCLUSIONS in calcite in garnet (type a) and magnetite (type b) zones is 75-125oC but the salinity of FLUID INCLUSIONS in calcite in garnet zone (15-25 wt. % NaCl) is more than salinity of these inclusions in magnetite zone (10-20 wt. % NaCl). d13C and d18O values of calcite (n=15) vary between -1.9 to +0.1 ‰(VPDB) and -19.4 to -14.9‰(SMOW), respectively. The average value of d18OWater is of +17.85‰(SMOW) in the Nukeh Fe deposit is different from the values for the primary magmatic fluid. Pyrite is the main sulfide mineral in the Nukeh Fe deposit and d34S values of pyrite (n=9) is within the range of +3.9 to +5.4 ‰ CDT. The source of sulfur is considered to be magmatic on this basis. FLUID INCLUSIONS and stable isotopic (O, C, S) data suggest that the ore-forming fluids evolved by the various mixtures of magmatic brines and meteoric water and probably the genesis of the Nukeh Fe deposit is similar to skarn deposits.

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APA: Copy

ESMAILNEZHAD, S., TAGHIPOUR, N., & HASSANNEZHAD, A.A.. (2017). THE EVOLUTION OF ORE-FORMING FLUIDS AND GENESIS OF NUKEH IRON DEPOSIT, NORTH SEMNAN BASED ON EVIDENCE FROM FLUID INCLUSIONS AND S, C, O STABLE ISOTOPES. GEOSCIENCES, 26(103), 309-322. SID. https://sid.ir/paper/32418/en

Vancouver: Copy

ESMAILNEZHAD S., TAGHIPOUR N., HASSANNEZHAD A.A.. THE EVOLUTION OF ORE-FORMING FLUIDS AND GENESIS OF NUKEH IRON DEPOSIT, NORTH SEMNAN BASED ON EVIDENCE FROM FLUID INCLUSIONS AND S, C, O STABLE ISOTOPES. GEOSCIENCES[Internet]. 2017;26(103):309-322. Available from: https://sid.ir/paper/32418/en

IEEE: Copy

S. ESMAILNEZHAD, N. TAGHIPOUR, and A.A. HASSANNEZHAD, “THE EVOLUTION OF ORE-FORMING FLUIDS AND GENESIS OF NUKEH IRON DEPOSIT, NORTH SEMNAN BASED ON EVIDENCE FROM FLUID INCLUSIONS AND S, C, O STABLE ISOTOPES,” GEOSCIENCES, vol. 26, no. 103, pp. 309–322, 2017, [Online]. Available: https://sid.ir/paper/32418/en

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