The petrology of the south-western end of the Mt. Samson gabbro-granite complex

Evan Raymond Phillips (1959). The petrology of the south-western end of the Mt. Samson gabbro-granite complex Honours Thesis, School of Physical Sciences, The University of Queensland.

       
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Author Evan Raymond Phillips
Thesis Title The petrology of the south-western end of the Mt. Samson gabbro-granite complex
School, Centre or Institute School of Physical Sciences
Institution The University of Queensland
Publication date 1959
Thesis type Honours Thesis
Supervisor Dr. R. Gradwell
Total pages 154
Language eng
Subjects 0403 Geology
040304 Igneous and Metamorphic Petrology
Formatted abstract

In the Upper Cedar Creek area a gabbro, "diorite", granodiorite, and granite complex is emplaced in the Silurian? Neranleigh-Fernvale Group. This is an orogenic belt, and the post-tectonic sequence is of basic rocks followed by acidic rocks. The gabbro is considered to be derived by the melting of a lower simatic layer. Heat developed by orogenesis and the intrusion of the gabbro, together with the introduction of the elements Na and Ca, caused a replacement of the sediments at depth, giving trondhjemitic rocks which were mobilized and intruded. Later potash metasomatism converted these to granodiorities, and, finally, to true mobilized granites. Contact metamorphism is discussed; especially the metamorphism by the gabbro of unusual slates, giving rise to olivine-bearing hornfelses.

Keyword Petrology -- Queensland -- Mount Samson Region

 
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