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Paper Information

Title: 

ALTERATION & MINERALIZATION CHARACTERISTICS, FLUID INCLUSION AND STABLE ISOTOPE STUDIES IN KHOONIK PROSPECT, SOUTH OF BIRJAND, KHORASAN PROVINCE

Type: PAPER
Author(s): SALIMI R.,LOTFI MOHAMMAD,RASAE I.
 
 
 
Name of Seminar: SYMPOSIUM OF EARTH SCIENCES
Type of Seminar:  SYMPOSIUM
Sponsor:  ORGANIZATION OF GEOLOGICAL OF IRAN
Date:  2006Volume 24
 
 
Abstract: 

Khoonik prospect is located in Lut ‌zone, Central of Iran. The Lut zone,s magmatic activity is related to Neo-tethyan subduction underneath the Central Iranian microplate. The Great Kavir or Douruneh fault is generally accepted as its Northern border. The Lut zone is separated from Tabas block in the west by Shotori range and Nayband fault system. In the east the Lut region is isolated from the Sistan block by the Harirod fault. The southern edge is defined by the volcanic complex of Bazman, Kuh- e - Shahsavaran and further south by Jazmorian depression.
The volcanic-plutonic rocks can be divided into andesite, trachyandesite, lattite, dacite and diorite based on the geochemical characteristics. Andesitic and dacitic rocks are characterized by low of Nb, Ti and Zr contents and correspond to typical of subduction zone arc magmas. Gold is disseminated type and native form in the Khoonik prospect. Pyrite is the main sulfide mineral commonly associated with minor chalcopyrite, covellite, digenite and bornite. The maximum  ore-grade of samples are 16.5 ppm Au, 47.5  ppm Ag, 4200 ppm Cu, 730 ppm Pb ,1376 ppm Zn, 207 ppm As and 74 ppm Mo. The wall-rocks are intensively altered and the main alteration minerals are quartz, carbonates, illite, sericite, chlorite, kaolinite, hematite, limonite and alunite.
Fluid inclusion data are available for 8 samples from quartz veinlets. The average temperature of homogenization (TH) is 280ºC accompanied with a peak up to 450ºC. The salinity ranges from 2.5 to 15 wt% NaCl equivalent.
The available sulfur isotope data for 6 pyrites from veins and trenches which their
δ34S CDT values vary from + 0.3 to + 1.4 permile. These values indicate certain magmatic source for sulfide ore mineralization in Khoonik prospect.

 
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