Wallrock Alteration; alteration haloes; Factors Controlling the Size and Nature of Alteration Zones; Wallrock Alteration Processes; Sericitization; Chloritization; Carbonatization (Dolomitization); Silicification: ((quartz+chert); Greisenization; Fenitization; Tourmalinization; Hematitization; Bleaching; Feldspathization; Albitization; Pyritization; Nature of Hydrothermal Alteration; Types of Wallrock Alteration; Potassic alteration; Phyllic (or sericitic) alteration; Propylitic alteration; Argillic alteration; Advanced argillic alteration; Secondary or Supergene Hydrothermal alterations

1. LECTURE 6:
HYDROTHERMAL ALTERATIONS
Prof. Dr. Hassan Z. Harraz
Geology Department, Faculty of Science, Tanta University
hharraz2006@yahoo.com
Spring 2020

11. Schematic Porphyry-Epithermal Alteration
Sillitoe (2010)

12. Distribution of alteration zones (left) and types of sulfide mineralization in
a porphyry copper deposit (after Lowell and Gilbert, 1970)

13. Secondary or Supergene Hydrothermal
Minerals

14. WALLROCK ALTERATION PROCESSES

17. Potassic Alteration
Alteration Textures
Phyllic Alteration
Phyllic Alteration

21. Advanced argillic alteration highlighted
by alunite veinlets and silicification within
a volcaniclastic unit
Advanced argillic alteration
Propylitic alteration

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