24 



CONTENTS. 



Chapter XII. — The Relations of Metamorphism to Ore Deposits — Continued. Page. 

 Part I. General principles — Continued. 



Deformation of the lithosphere — Continued. 



Zone of fracture, or zone of kataniorphism — Continued. 



Chemical reactions 1008 



Zone of combined fracture and flowage 1009 



Zone of flowage, or zone of anamorphism _ 1011 



Openings of zone of flowage 1012 



Reactions of zone of flowage ! 1012 



Relations between zones of deformation 1012 



Effects of deformation and chemical changes upon temperature 1013 



Volcanism 1014 



Circulation and work of solutions 1017 



Circulation of gaseous solutions . . 1018 



Circulation in belt of weathering 1018 



Circulation in belt of cementation 1019 



Circulation in zone of anamorphism 1020 



Circulation of aqueous solutions 1021 



Circulation in zone of fracture, or zone of kataniorphism 1022 



Belt of weathering 1023 



Belt of cementation 1024 



Circulation in zone of combined fracture and flowage 1028 



Circulation in zone of flowage, or zone of anamorphism 1029 



Som-ce of the metals 1030 



Part II. Segregation of ores 1036 



General statements 1 036 



Division A. Ores produced by processes of sedimentation 1037 



Ores formed by chemical precipitation 1037 



Ores formed by mechanical concentration 1038 



Metamorphic alterations of sedimentary ores 1039 



Division B. Ores produced by igneous processes 1043 



Division C. Ores produced by processes of metamorphism 1052 



Group A. Ores deposited by gaseous solutions 1052 



Group B. Ores deposited by aqueous solutions 1058 



I. Source of aqueous solutions 1065 



II. Source of metals for ores deposited from aqueous solutions 1069 



III. Work of aqueous solutions in segregating ores 1072 



Subclass 1. Ores precipitated from ascending aqueous solutions 1072 



Solution of the metals 1073 



Transportation of the metals 1075 



Precipitation of the metals 1081 



Precipitation by decrease of temperature and pressure 1081 



Precipitation by mingling of solutions 1082 



Precipitation by reactions between solutions and solids 1086 



General statements : 1088 



