The origin of scapolite in the regionally metamorphosed rocks of Mary Kathleen, Queensland, Australia

Ramsay C.R. and Davidson L.R. (1970) The origin of scapolite in the regionally metamorphosed rocks of Mary Kathleen, Queensland, Australia. Contributions to Mineralogy and Petrology, 25 1: 41-51. doi:10.1007/BF00383061


Author Ramsay C.R.
Davidson L.R.
Title The origin of scapolite in the regionally metamorphosed rocks of Mary Kathleen, Queensland, Australia
Journal name Contributions to Mineralogy and Petrology   Check publisher's open access policy
ISSN 0010-7999
Publication date 1970
Sub-type Article (original research)
DOI 10.1007/BF00383061
Volume 25
Issue 1
Start page 41
End page 51
Total pages 11
Publisher Springer-Verlag
Subject 1908 Geophysics
1906 Geochemistry and Petrology
Abstract Scapolite at Mary Kathleen (North-Western Queensland) occurs in calcareous and non-calcareous metapelites, acid and basic metavolcanics and metadolerites. Graphical treatment of the relationship between scapolite composition (Me%) and the host rock oxide ratios CaO/Na2O and Al2O3/(CaO + Na2O) reveals the following points: (a) The calcareous metapelites are also very sodic. (b) Scapolite in calcareous metapelites is more marialitic than that in low-calcium equivalents. (c) In graphs of Me% against CaO/Na2O and Al2O3/(CaO + Na2O) the metasediments and the metaigneous rocks show markedly different trends. It is concluded that scapolite in the metasediments originated by isochemical metamorphism of shales and marls containing evaporitic halite. The local abundance of halite was the main control on the composition and distribution of the scapolite, but the relative abundance of CaO and Na2O was a modifying factor. In the metaigneous rocks scapolite formed metasomatically during regional metamorphism by the introduction of volatile-rich fluids derived from the adjacent evaporitic sediments. The relative availability of CO2 and Cl2 again appears to have been the primary control on scapolite composition and may in turn have been controlled by bulk rock composition.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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