MAGMATISM AND ALTERATION IN AHAR-JOLFA AXIS (ARASBARAN), AND THEIR AASSOCIATION WITH MINERALIZATION

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GHORBANI M.

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Journal: JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY) Year:2011 | Volume:21 | Issue:81 (GEOLOGY ISSUE) Page(s): 23-38

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Title

MAGMATISM AND ALTERATION IN AHAR-JOLFA AXIS (ARASBARAN), AND THEIR AASSOCIATION WITH MINERALIZATION

Author(s)

GHORBANI M. | Issue Writer Certificate

Keywords

MAGMATISMQ3

ALTERATIONQ2

MINERALIZATIONQ2

AHAR-JOLFA AXISQ2

Abstract

Introduction: Ahar-Jolfa is located in northwestern part of Iran, and it was one of the most active magmatic regions in Iran during Tertiary. Magmatic activities along this axis started in Late Cretaceous, and carried on through Quaternary but not continuously.Aim: To study the magmatic phases that occurred within AHAR-JOLFA AXIS, and their association with MINERALIZATION along this axis.Result: With regards to the outcrops of magmatic rocks along this axis, four separate magmatic phases can be specified.1. Late Cretaceous to Middle Eocene magmatic phase where volcanic rocks and small shallow intrusive bodies are evident and widely seen in the area.2. Late Eocene to Early Oligocene magmatic phase in which only batholiths with composition of gabbro-granite formed, and accompanied with copper MINERALIZATION of skarnic and veiny types.3. Miocene-Pliocene magmatic phase where volcanic rocks and small intrusive bodies are seen together and main MINERALIZATION within AHAR-JOLFA AXIS is associated with this magmatic phase.4. Quaternary volcanic phase that produced Quaternary basalts along AHAR-JOLFA AXIS, and all basalts in Azerbaijan as well.In this paper the data used in petrologic, magmatic and mineralogical analysis includes the results from studying 200 thin sections, 70 XRF analyses and 35 I.C.P. analyses on Au, Cu, Zn, Pb, As, Mo, Sb elements (FA3 method applied for Gold content and IC3E method for the rest of the elements).Conclution: From ALTERATION standpoint, there are three separable ALTERATIONs observed within AHAR-JOLFA AXIS with different specifications.1. Regional ALTERATION: it is widely seen along this axis, and its zoning starts from argillic in the bottom, hematitic in the middle, and silisic on the top. This ALTERATION is controlled by lithology, fault zones, and ancient kalderas in the area. In regards to MINERALIZATION, this ALTERATION is barren.2. Local ALTERATION: this ALTERATION is seen scarcely in form of fairly small areas along AHAR-JOLFA AXIS and various zones can be detected including propyllitic, potassic, silisic, algillic, and phyllitic. This local ALTERATION is mostly seen in the areas with shallow intrusive bodies with age of Miocene-Pliocene. This ALTERATION is generally found fruitful. 3. Silisic ALTERATION: it displays a wider age range, and is mostly seen in form of silisic veins with generally gold anomalies, but the gold content and grade is not economically significant.

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APA: Copy

GHORBANI, M.. (2011). MAGMATISM AND ALTERATION IN AHAR-JOLFA AXIS (ARASBARAN), AND THEIR AASSOCIATION WITH MINERALIZATION. JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY), 21(81 (GEOLOGY ISSUE)), 23-38. SID. https://sid.ir/paper/70252/en

Vancouver: Copy

GHORBANI M.. MAGMATISM AND ALTERATION IN AHAR-JOLFA AXIS (ARASBARAN), AND THEIR AASSOCIATION WITH MINERALIZATION. JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY)[Internet]. 2011;21(81 (GEOLOGY ISSUE)):23-38. Available from: https://sid.ir/paper/70252/en

IEEE: Copy

M. GHORBANI, “MAGMATISM AND ALTERATION IN AHAR-JOLFA AXIS (ARASBARAN), AND THEIR AASSOCIATION WITH MINERALIZATION,” JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY), vol. 21, no. 81 (GEOLOGY ISSUE), pp. 23–38, 2011, [Online]. Available: https://sid.ir/paper/70252/en

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