CONTENTS. 19 



Chapter VII. — The Belt of Cementation — Continued. Page. 

 Work in belt of cementation — Continued. 

 Chemical work — Continued. 



Resultant processes — Continued. 



Metasomatism 640 



Definition 640 



Extent of process 640 



Conditions favorable to metasomatism 641 



Minerals produced _ 642 



Growth of large individuals and preservation of textures 643 



Segregation of individual minerals 645 



Igneous work 646 



Injection 646 



Combinations and relations of mechanical work, chemical work, and igneous work.. 653 



Changes of chemical composition 655 



Chapter VIII. — The Zone op Anamorphism 657 



Definition of zone 657 



Condition of water 659 



Quantity of water 661 



Circulation of water 661 



Variable materials and conditions 668 



Work in zone of anamorphism 670 



Mechanical work ._ 670 



Welding 670 



Strain within elastic limit 671 



Strain beyond elastic limit 673 



Chemical work 675 



Chemical changes 676 



Deoxidation _ 676 



Silication 677 



Dehydration _ 679 



Solution and deposition _ _ 680 



Resultant processes : 681 



Cementation 681 



Metasomatism 682 



Minerals formed 683 



Alterations in connection with mass-mechanical action 685 



Recrystallization 686 



Facts of recrystallization 686 



Theory of recrystallization 690 



Recrystallization lags behind deformation 696 



Conclusion 698 



Alterations under mass-static conditions 698 



Development of porphyritic textures . 699 



Regeneration of mineral particles 705 



