|
|
|
UDC 553.493.5:552.331.4(571.151) THE MANTLE-CRUST INTERACTION AND GEODINAMIC SETTING OF FORMING MOUNTAIN ALTAI HERCYNIAN TECTOGENESE GRANITOIDS
Granitoids I-, S-, A-types, characterized mantle-crust interaction with different degrees of contamination of crust material formed in Mountain Altai in Hercynian tectogenese. Subtypes in composition of I-type granitoids detached: a – weak contamination; b – strong contamination and reduced; c – peraluminous. Indicated subtypes form the original trend of depletation isotopes neodium and strontium from weak contamination I-types to peraluminium direction at parallel increasing degree aluminous of rocks. The negative meaning of εNd(t) characterized for peraluminous granitoids of borovljanskii and rakhmanovskii complexes. Granitoids of S-type formed in the result of collizional processes. S-type granites bring in their extremely degree presence of crust material characterizing of high aluminous minerals (cordierite, garnet) and high signifi cances ratio of 87Sr/86Sr granitoids presence. Anorogenic of Maiorskii and Elinovskii massives have εNd(t) value complies within 3,8 to 3,9, assimilation of 9–10 % lower and middle crust by melt material. The A- and I-types of granitoids obliged to intracontinental riftogenesis in related of function Siberian superplum.
Key words: granitoids, petrogenetic types of granites, mantle-crust interaction, contamination, mixing of magmas, isotopes of strontium and neodium, riftogenesis, collision, superplum.
|
|
|
|
© SNIIGGiMS, 2017. All rights reserved. | 67 Krasny pr., Novosibirsk, 630091 Russia. Tel.: 73832214947, 73832214980, fax: 73832214947