MINERALOGICAL AND GEOCHEMICAL STUDIES OF HYDROTHERMAL ALTERATIONS IN THE ABTORSH AREA

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GANJI A.R.; AGHAJANI S.; MORTAZAVI CHAMCHALI M.

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Journal: JOURNAL OF EARTH AND RESOURCES Year:2010 | Volume:3 | Issue:2 (7) Page(s): 55-68

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Title

MINERALOGICAL AND GEOCHEMICAL STUDIES OF HYDROTHERMAL ALTERATIONS IN THE ABTORSH AREA

Author(s)

GANJI A.R. | AGHAJANI S. | MORTAZAVI CHAMCHALI M. | Issue Writer Certificate

Keywords

MINERALOGYQ2

GEOCHEMISTRYQ2

HYDROTHERMAL ALTERATIONSQ3

ARGILLIC-ALUNITICQ3

TAROMQ3

ABTORSHQ3

Abstract

The study area (Abtorsh) is located in the western part of Central Alborz, in northwest of Qazvin. The area is a part of TAROM geostructural subzone which is contained Eocene subaerial and submarine volcanic rocks, Neogene conglomerate and Quaternary deposits. From stratigraphy viewpoint, the volcanic rocks are equivalent with Karaj formation in the Central Alborz and their age has been considered Middle to late Eocene. The volcanic rocks almost exclusively have been suffered hydrothermal alteration and therefore the assumption can be considered very unlikely that the formation of alteration zones in the area was caused by Tertiary volcanism with syn- and post-volcanic hydrothermal fluids activation. The hydrothermal alteration zones which are exposed in the ABTORSH area include propylitic, argillicalunitic and silicic alterations that from viewpoint of intensity and vastness the ARGILLIC-ALUNITIC alteration zone has a special significance in the area. The ARGILLIC-ALUNITIC alteration is formed in acidic tuffs and contains three parts which are included in a vertical sequence from bottom to top, respectively serisitic-argillic, ARGILLIC-ALUNITIC and silicic. Mineralogical studies conducted on samples taken from different parts of ARGILLIC-ALUNITIC alteration zone showed that each of the three parts is formed from different mineral assemblage. Thus in the serisitic-argillic part: serisite-quartz-pyrite-montmorillonite-gypsum±kaolinite±K feldspar±anatase±alunite; in the ARGILLIC-ALUNITIC part: kaolinite-alunite-quartz-montmorillonite±jarosite and in the silicic part: quartz-alunite-kaolinite±montmorillonite were identified. Geochemical studies and trace elements behavior showed that ARGILLIC-ALUNITIC alterations in the studied area are comparable with acid sulfate or high sulfidation epithermal alterations which are formed in the hydrothermal magmatic or hypogene environment.

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APA: Copy

GANJI, A.R., AGHAJANI, S., & MORTAZAVI CHAMCHALI, M.. (2010). MINERALOGICAL AND GEOCHEMICAL STUDIES OF HYDROTHERMAL ALTERATIONS IN THE ABTORSH AREA. JOURNAL OF EARTH AND RESOURCES, 3(2 (7)), 55-68. SID. https://sid.ir/paper/164367/en

Vancouver: Copy

GANJI A.R., AGHAJANI S., MORTAZAVI CHAMCHALI M.. MINERALOGICAL AND GEOCHEMICAL STUDIES OF HYDROTHERMAL ALTERATIONS IN THE ABTORSH AREA. JOURNAL OF EARTH AND RESOURCES[Internet]. 2010;3(2 (7)):55-68. Available from: https://sid.ir/paper/164367/en

IEEE: Copy

A.R. GANJI, S. AGHAJANI, and M. MORTAZAVI CHAMCHALI, “MINERALOGICAL AND GEOCHEMICAL STUDIES OF HYDROTHERMAL ALTERATIONS IN THE ABTORSH AREA,” JOURNAL OF EARTH AND RESOURCES, vol. 3, no. 2 (7), pp. 55–68, 2010, [Online]. Available: https://sid.ir/paper/164367/en

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