The petrology of the eruptive rocks of the Yarraman district

Gradwell, Richard The petrology of the eruptive rocks of the Yarraman district. Brisbane: University of Queensland Press, 1949.

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Author Gradwell, Richard
Title The petrology of the eruptive rocks of the Yarraman district
Place of Publication Brisbane
Publisher University of Queensland Press
Publication year 1949
Sub-type Research book (original research)
Open Access Status File (Publisher version)
Volume 3
Series Papers (University of Queensland. Dept. of Geology) ; v.III, no. 8.
Language eng
Total number of pages 39
Subjects 260100 Geology
Formatted Abstract/Summary

SUMMARY

An area of about one hundred and fifty square miles between Benarkin and Nanango was investigated. Rocks occurring here range in age from early Palaeozoic to Tertiary, but for only one group is the age known with any certainty. A large part of the area is occupied by eruptive rocks and it is about the relationship of these that most of the discussion centres.

The relationships of the various rocks is as follows :

Tertiary   ----  ----      ----      ----  Laterites

              ----  ----      ----      ----  Cooyar Basalts

              ----  ----      ----      ----  Porphyry Dykes

Triassic   …………………………………..  Upper Esk Series

             …………………………………..  Taromeo Tonalite

             …………………………………..  Yarraman Granodiorite

             …………………………………..  Volcanics - mostly Rhyolite

             …………………………………..  Gilla Andesites

             …………………………………..  " Gympie Series "     

Late Devonian     ----          ----      Serpentine

Early Palaeozoic   ----          ----      Bunya Phyllites

The relative placing of some of these is only tentative.

The granitic rocks are thought to have formed, in part at least, by granitisation of altered Bunya Phyllites. The resulting granitic "magma " was, in some places, forcefully injected, and the evidence shows that these rocks were emplaced close to the surface.

Keyword Igneous rocks -- Queensland -- Yarraman Region
Petrology -- Queensland -- Yarraman Region
Igneous rocks
Petrology -- Queensland
Q-Index Code AX
Q-Index Status Provisional Code
Institutional Status UQ

 
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