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- Title
Geochemical Characteristics of Rare Earth Elements in Argillic Alteration Zone: An Example from the Kharvana area, NW Iran.
- Authors
Abedini, Ali; Khosravi, Maryam
- Abstract
The emplacement of Oligocene tonalitic, granodiorite, and quartz diorite suites into Cretaceous andesitic rocks causes the generation of an argillic alteration zone in the northeast of the Kharvana area. No detailed geochemical consideration of the argillic alteration zone has been carried out. In this research, factors controlling the mobility and concentration of rare earth elements (REE) in this alteration zone are determined by different geochemical techniques. The mineralogical and geochemical characteristics of the argillic alteration zone were examined by X-ray diffractometer and Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES) and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS), respectively. Based on mineralogical analyses, quartz, kaolinite, alunite, pyrophyllite, muscovite-illite, rutile, chlorite, jarosite, hematite, goethite, and pyrite are the dominant mineral phases in the Kharvan argillic alteration zone. Chondritenormalized REE spider diagrams indicate fractionation and enrichment of LREE from HREE, along with Eu and Ce negative anomalies during the development of the argillic alteration zone. Taking into account Al as an immobile monitor element, argillization of andesite rocks was accompanied by leaching and fixation of REE. Whereas, among the lanthanides, Ce displays a decrease in the content of all the argillic samples. Combining the results obtained from mass change calculations and geochemical parameters, such as (SLREE/SHREE)N and (La/Yb)N ratios, shows that the distribution of lanthanides during the development of the argillic alteration zone is controlled by a number of factors, including changes in pH and redox potential of environment, the difference in the degree of destabilization of lanthanide complexes, adsorption, scavenging by metallic oxides and hydroxides, and isomorphic substitution.
- Subjects
IRAN; ANALYTICAL geochemistry; MOBILITY (Structural dynamics); RARE earth metal compounds; X-ray diffractometers
- Publication
Jordan Journal of Earth & Environmental Sciences, 2024, Vol 15, Issue 1, p20
- ISSN
1995-6681
- Publication type
Article