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Production of Alkaline Rocks by the Alteration of Haplogranites and Haplobasalts under High Pressures and Temperatures

  • N. V. Kotov
  • N. F. Shinkarev
  • M. I. Domnina
  • A. V. Donskih
  • M. P. Rogosin

Abstract

The problem of the origin of alkaline rocks is rightfully considered to be one of the most important in modern petrology. Features of their hetrogeneity include: Enrichment of some types of alkaline rocks with great amounts of potassium and others with sodium; their enrichment with volatile constituents; their positional and temporal connection with basic rocks and sometimes with granithoides [1,2]; in most cases their obvious mantle origin and their being confined to fractured structures in the earth’s crust; and often their high enrichment with rare elements and specific conditions of their formation [3–6]. In this connection an experimental modeling of the petrogenetic environment which leads to the formation of the alkaline rocks is of great importance. Some advance in this branch of knowledge has been made in the experimental development of different aspects of the crystallization differentiation [7] and liquefation [8] hypotheses. However, none of these hypotheses has resulted in any available explanation for the production of large intrusions of the nephelinite and leucitite fusions and calcite-bearing rocks. Thus, the study of this problem seems to be quite urgent.

Keywords

Vapor Phase Alkaline Rock Metasomatic Rock Sodium Carbonate Solution East African Rift 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1979

Authors and Affiliations

  • N. V. Kotov
    • 1
  • N. F. Shinkarev
    • 1
  • M. I. Domnina
    • 1
  • A. V. Donskih
    • 1
  • M. P. Rogosin
    • 1
  1. 1.Leningrad State UniversityLeningradUSSR

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