The Andes of southern Peru . i-t ^ 3 g tiSt) C5 s i a> ,d ° ^ +3 O > -fj ^ >? o iH ^ O -^^ CO K-i M h g 2 -S a -*^ o Ci 0) 3 ^ o ci o o -u ? >;> ~*^ ^H g cS S, &. m c4 Cfi Jj « fH ap d S 1 a^ ^ CO o O O g^ a g g eq cs o o H EASTERN ANDES: CORDILLERA VILCAPAMPA 219 the line of contact which was once a prominent topographic fea-ture. With reference to the effects of climate it may be said sim-ply that a granite core of batholithic origin may extend above thesnowline or above timber line or into the timbered belt, whereasthe invaded rock may occur largely below these levels wi
The Andes of southern Peru . i-t ^ 3 g tiSt) C5 s i a> ,d ° ^ +3 O > -fj ^ >? o iH ^ O -^^ CO K-i M h g 2 -S a -*^ o Ci 0) 3 ^ o ci o o -u ? >;> ~*^ ^H g cS S, &. m c4 Cfi Jj « fH ap d S 1 a^ ^ CO o O O g^ a g g eq cs o o H EASTERN ANDES: CORDILLERA VILCAPAMPA 219 the line of contact which was once a prominent topographic fea-ture. With reference to the effects of climate it may be said sim-ply that a granite core of batholithic origin may extend above thesnowline or above timber line or into the timbered belt, whereasthe invaded rock may occur largely below these levels with obvi-ous differences in both the rate and the kind of erosion affectingthe intruded mass. If we apply the foregoing considerations to the CordilleraVilcapampa, we shall find some striking illustrations of the prin-ciples involved. The invasion of the granite was accompanied bymoderate absorption of the displaced rock, and more especiallyby the marginal pushing aside of the sedimentary rim. The im-mediate effect must have been to give both intruded rock and coun-try rock greater height and marked ruggedness. There followeda period of regional compression and torsion, and the develop-ment of widespread joint systems with strikingly re
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Keywords: ., bookcentury1900, bookdecade1910, bookidandeso, booksubjectgeology
