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1. Geology, alteration, mineralization and geochemistry at south of Arghash (Neyshabour)

Author

Zahra Karimi Saeidabadi, Seyed Ahmad Mazaheri, and Mohammad Hassan Karimpour

Subjects
Arghesh, Porphyry copper, Potasic, Central Iran, Geology, QE1-996.5
Abstract

The Arghash area is located 45 km to southwest of Neyshabour. The subvolcanic rocks in the area consist of biotite hornblende quartz monzodiorite porphyry, hornblende biotite quartz monzodiorite porphyry, hornblende monzonite porphyry, biotite hornblende monzonite porphyry, monzodiorite porphyry and biotite quartz monzodiorite porphyry units. The volcanic rocks consist of hornblende biotite dacite, biotite hornblende dacite, and andesite and pillow lava. The plutonic rocks consist of hornblende monzodiorite, hornblende monzonite, quartz monzonite, hornblende quartz monzodiorite, biotite granodiorite, hornblende granodiorite, biotite hornblende granodiorite, biotite quartz diorite and pyroxene dolerite units. Five types of alteration including propylitic, carbonate, argillic, silicification and sericitic were recognized. Those are subdivided into twelve sub-zones based on the mineral abundances and intensity of alteration. Primary pyrite, 3-4%, is found mainly as disseminated. Secondary mineralization includes limonite, hematite and jarosite. Twenty rock chip and 8 stream sediment samples were collected for geochemical exploration. The samples were analysed for Cu, Zn, Pb, Ag and Sb using Atomic Absorbtion Spectrophotometric (AAS) method. In stream sediment samples, Cu abundance is 34-58 ppm, Zn 45-422 ppm, Pb 28-42 ppm and Ag 2-12 ppm; whereas in rock chip samples, Cu abundance is 8-1137 ppm, Zn 13-411 ppm, Pb 15-97 ppm and Ag 3-32 ppm.

Published
2011
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2. Origin of the Kaviro lead deposit in the Neyganan area, Lut Block, Eastern Iran: Constraints from geology, fluid inclusions, and isotope geochemistry

Author

Mohammad Hassan Karimpour, Fernando Corfu, Zahra Karimi Saeidabadi, Behnam Rahimi, and Azadeh Malekzadeh Shafaroudi

Subjects
Calcite, 010504 meteorology & atmospheric sciences, Hypogene, Metamorphic rock, Dolomite, Geochemistry, engineering.material, 010502 geochemistry & geophysics, 01 natural sciences, chemistry.chemical_compound, chemistry, Geochemistry and Petrology, Galena, Isotope geochemistry, engineering, Economic Geology, Fluid inclusions, Pyrite, Geology, 0105 earth and related environmental sciences
Abstract

The Kaviro lead deposit is located in the Lut Block, which is an important metallogenic province in Eastern Iran (lat 34°22′N, long 57°18′E). The deposit includes ore-bearing veins and veinlets emplaced in folds and hosted by middle Jurassic slate units. The ore-forming procedure can be segregated into three stages: pre-mineralization stage quartz-pyrite, main stage quartz-dolomite-pyrite-galena, and late stage calcite and pyrite. Hydrothermal alteration minerals are composed of dolomite, quartz, and calcite. Microscopic surveys show that the vein includes galena with minor amounts of pyrite as hypogene minerals. Two types of fluid inclusions are distinguished in quartz and dolomite veins. Microthermometric investigations reveal homogenization temperatures of 180–250 °C and salinities from 5 to 12.5 wt% NaCl equivalents. The ore-forming fluids of the Kaviro deposit are medium-to-low in terms of temperature and salinity. The δ34S values for the ore fluid are estimated to be between +0.94‰ and +3.27‰. The isotopic compositions of sulfur suggest that the ore-forming aqueous solutions are derived from a nonmagmatic source, probably from leaching of metamorphic rocks. The 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb ratios of the samples span narrow ranges from 18.514 to 18.569, 15.668 to 15.715, and 38.803 to 38.950, respectively. The 207Pb/204Pb and 208Pb/204Pb ratios plot above the evolution curves and clearly indicate a crustal source. The 207Pb/204Pb vs. 206Pb/204Pb data suggest a homogen source for Pb. Most of the galena samples in the CIM Pb-Zn deposits show high 207Pb/204Pb ratios, indicating that Pb is mainly derived from continental crust or pelagic sediment. The age of the mineralization is after the middle Jurassic. The Kaviro deposit is a metamorphic-related vein deposit, and fluid mixing is the important mechanism for its deposition.

Published
2018

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