The alteration styles include silicification, carbonatization, sulfidation, sericitization and chloritization.
Yong-Jun Shao, Wen-Shu Wang, Qing-Quan Liu, Yu Zhang 2018, 'Trace Element Analysis of Pyrite from the Zhengchong Gold Deposit, Northeast HunanProvince, China: Implications for the Ore-Forming Process', Mineralshttp://www.mdpi.com/2075-163X/8/6/262. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
The associated hydrothermal alterations include carbonatization, silicification, sericitization and argillicalterations.
Ibrahim H. Khalifa, Mohammed Z. El-Bialy, Doa'a M. Hassan 2011, 'Petrologic and geochemical characterization and mineralization of the metavolcanicrocks of the Heib Formation, Kid Metamorphic Complex, Sinai, Egypt', Geoscience Frontiershttp://www.sciencedirect.com/science/article/pii/S167498711100048X. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Early hydrothermal activity was responsible for four types of hypogene alteration in decreasing intensity: silicification, sericitization, hematization and argillic alteration.
Ali Haydar Gultekin, Nurgul Balci 2016, 'Mineralogy, Geochemistry and Fluid Inclusion Data from the Tumanpınarı Volcanic Rock-HostedFe-Mn-Ba Deposit, Balıkesir-Dursunbey, Turkey', Mineralshttp://www.mdpi.com/2075-163X/6/4/120. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Rocks are granodiorites and adamellites with albites showing variable degrees of sericitization, and no-weathered potassic feldspars.
Martín Patino, M. T., Guijarro, J., Casas, J., Martín de Vidales, J. L. 1988, 'Origen de arcillas alumínicas en horizontes de alteración de materialesgraníticos del borde sur de la sierra de Guadarrama', Estudios Geologicoshttp://estudiosgeol.revistas.csic.es/index.php/estudiosgeol/article/view/555/576. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)