geochemistry of hydrothermal alterations associated with epithermal gold mineralization in masjeddaghi area, east of jolfa, nw iran
نویسندگان
چکیده
two types of mineralization including porphyry copper and epithermal gold mineralization have occurred in relation with an intermediate volcano-plutonic complex in masjeddaghi area. different alterations including silica, advanced argillic, intermediate argillic and propylitic have been distinguished in relation with epithermal mineralization, which have a zonal pattern. elemental mass gains and losses during alterations were calculated using zr as an immobile monitor. silica zone has enriched in sio2 and relatively in al2o3 and k2o, and has depleted in na2o, mgo and cao. ba, sr, pb, rb and cu elements have also enriched. the advanced argillic zone shows enrichment in so3, al2o3, sio2, k2o, mgo and l.o.i; and depletion in fe2o3, cao, na2o, mno and mgo. barium, cu, sr and zn have depleted in this zone. propylitic zone has enriched in mgo, cao, l.o.i and sio2, and has depleted in na2o and k2o. geochemical and mineralogical evidences indicate that the hydrothermal leaching of mafic minerals in parent rocks and formation of quartz, kaolinite, sericite and alunite assemblage in advanced argillic zone; and chlorite, epidote and calcite assemblage in propylitic zone is responsible for the above mentioned chemical variations. it is likely that the gains and losses of elements have been controlled by agents such as water/rock ratios, temperature changes and chemistry of hydrothermal solutions. the cia and mia indicators in the altered rocks indicate the intensity of alteration in silica and advanced argillic zones in comparison with propylitic zone.
منابع مشابه
Geochemistry of Hydrothermal Alteration Associated with Cenozoic Intrusion-Hosted Cu-Pb-Zn Mineralization at Tavsanlı Area, Kütahya, NW Turkey
The Miocene magmatic intrusion in the Tavşanlı zone of the Kütahya-Bolkardağ Belt (KBB) in the northwestern region of Turkey is represented by the Eğrigöz granitoids. This paper studies the petrology and geochemistry of hydrothermal alterations associated with the vein-type Cu-Pb-Zn mineralization hosted by this pluton, focusing on the determination of the mass gains and losses of chemical comp...
متن کاملMODELLING THE As-Au ASSOCIATION IN HYDROTHERMAL GOLD MINERALIZATION: EXAMPLE OF ZARSHURAN DEPOSIT, NW IRAN
متن کامل
modelling the as-au association in hydrothermal gold mineralization: example of zarshuran deposit, nw iran
0
متن کاملPetrography, geochemistry, magmatic evolution and tectenomagmatic setting of igneous rocks associated with Nikuyeh epithermal mineralization (west of Qazvin)
The Nikuyeh district is located south of the Tarom-Hashtjin metallogenic province in Western Alborz. Oligo-Miocene subvolcanic intrusion and Mid-Eocene volcanic rocks with composition of dacite to andesite are main igneous settings associated with Nikuyeh polymetallic epithermal ore mineralization. Igneous phase in the Nikuyeh district are porphyritic granodiorite, monzodiorite, quartz monsonit...
متن کاملInvestigations of gold-sulfide mineralization and microthermometry within quartz veins/veinlets in the Gharehchay area, south of Tikmehdash, East-Azarbaidjan province, NW Iran
The gold-bearing prospect area at Gharehchay is located in about 2 km south of Tikmehdash, East-Azarbaidjan, NW Iran. The host rocks of the gold-bearing quartz veins/veinlets are principally Eocene andesites and upper Eocene-Oligocene felsic intrusive body (granite to alkali granite). Wall rocks alteration haloes developed around the veins/veinlets are mainly of silicic, phyllic, phyllic-argill...
متن کاملThe Bijvard epithermal gold-manganese prospect area, Northern Bardaskan, Khorasan Razavi: Evidence from geology, mineralization and geochemistry
Bijvard prospect area is located in the northern part of Central Iran zone, Sabzevar zone, about 40 km north of Bardaskan. The rock units exposed in the area include Cretaceous volcano-sedimentary rocks (andesite, basalt, graywacke and conglomerate) that syenogranite porphyry unit has intruded into them. Mineralization has structural control, with N35E trending, and has altered the andesitic r...
متن کاملمنابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
زمین شناسی اقتصادیجلد ۲، شماره ۲، صفحات ۱۹۹-۰
میزبانی شده توسط پلتفرم ابری doprax.com
copyright © 2015-2023