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Pre‐collision Granites and Post‐collision Intrusive Assemblage of the Kelameili‐Harlik Orogenic Belt

Pre‐collision Granites and Post‐collision Intrusive Assemblage of the Kelameili‐Harlik Orogenic Belt The main types of intrusive rocks in the Kelameili‐Harlik Hercynian orogenic belt include calc‐alkaline granites, diabase dykes, kaligranites and alkaline granites. Investigation in field geology, petrology, mineralogy and geochemistry shows that the calc‐alkaline granites belong to the syntexis‐type (or I‐type) and were formed in a pre‐collisional magmatic arc environment. In consideration of the fact that kaligranites have many features of alkaline granites with higher consolidation temperatures than the calc‐alkaline granites and show a discontinuity of minor element and REE evolution in respect to the calc‐alkaline granites, they could not have been derived by differentiation of magmas for the calc‐alkaline granites, but are likely to have been generated in an environment analogous to that for alkaline granites. The triplet of basic dyke swarms, kaligranites and alkaline granites could be regarded as a prominent indication of the initial stage of post‐collisional delamination and extension. These rocks might have originated from underplating and intraplating of mantle‐derived magmas at varying levels with varying degrees of partial melting, mixing, and interchange of crustal and mantle materials http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Geologica Sinica (English Edition) Wiley

Pre‐collision Granites and Post‐collision Intrusive Assemblage of the Kelameili‐Harlik Orogenic Belt

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References (85)

Publisher
Wiley
Copyright
1999 Geological Society of China
ISSN
1000-9515
eISSN
1755-6724
DOI
10.1111/j.1755-6724.1999.tb00840.x
Publisher site
See Article on Publisher Site

Abstract

The main types of intrusive rocks in the Kelameili‐Harlik Hercynian orogenic belt include calc‐alkaline granites, diabase dykes, kaligranites and alkaline granites. Investigation in field geology, petrology, mineralogy and geochemistry shows that the calc‐alkaline granites belong to the syntexis‐type (or I‐type) and were formed in a pre‐collisional magmatic arc environment. In consideration of the fact that kaligranites have many features of alkaline granites with higher consolidation temperatures than the calc‐alkaline granites and show a discontinuity of minor element and REE evolution in respect to the calc‐alkaline granites, they could not have been derived by differentiation of magmas for the calc‐alkaline granites, but are likely to have been generated in an environment analogous to that for alkaline granites. The triplet of basic dyke swarms, kaligranites and alkaline granites could be regarded as a prominent indication of the initial stage of post‐collisional delamination and extension. These rocks might have originated from underplating and intraplating of mantle‐derived magmas at varying levels with varying degrees of partial melting, mixing, and interchange of crustal and mantle materials

Journal

Acta Geologica Sinica (English Edition)Wiley

Published: Sep 1, 1999

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