The mineralogy and geochemistry of the Mica Creek pegmatites, Mount Isa, Northwest Queensland

Glenys (Glenys Evelyn) McGowan (1991). The mineralogy and geochemistry of the Mica Creek pegmatites, Mount Isa, Northwest Queensland Honours Thesis, School of Physical Sciences, The University of Queensland.

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Author Glenys (Glenys Evelyn) McGowan
Thesis Title The mineralogy and geochemistry of the Mica Creek pegmatites, Mount Isa, Northwest Queensland
School, Centre or Institute School of Physical Sciences
Institution The University of Queensland
Publication date 1991
Thesis type Honours Thesis
Supervisor Dr . Anthony Ewart
Total pages 167
Language eng
Subjects 040304 Igneous and Metamorphic Petrology
0403 Geology
Formatted abstract

The pegmatite’s of Mica Creek occupy a roughly triangular area at the northernmost extremity of a large pluton known as the Sybella Granite . They intrude units of the surrounding Haslingden Group country rocks, in particular amphibolites of the Eastern Creek Volcanics, and are al so locally abundant within the Sybella Granite itself.

Investigations show that the majority of pegmatites were late stage differentiates from the Sybella Granite and themselves followed a complex crystallisation sequence culminating in the development of unusual textures, exotic mineral phases and at least four replacement assemblages. By contrast, a limited number of small pegmatitic bodies within the Sybella Granite are attributed to partial melting phenomena operating in conjunction with regional deformation.

The mineralogical and textural diversity of the Mica Creek pegmatites has enabled them to be subdivided into eight distinct "types ". Al l are essentially granitic in composition, although a small number have been extensively altered by hydrothermal solutions.

Palaeotemperature estimates for the final crystallisation of the Sybella Granite and partial melt pegmatites are less than 400 C , while the crystallisation of the major pegmatite varieties commenced at approximately 660º C and continued through to about 350º C .

Trace element abundances indicate that the Sybella Granite and Mica Creek pegmatites were generated in an intracratonic tectonic setting .

Keyword Igneous rocks -- Queensland -- Mount Isa Region
Geology -- Queensland -- Mount Isa Region
Mineralogy -- Queensland -- Mount Isa Region
Additional Notes There is no page number 20 in the original thesis
Other Title: The geology of Mica Creek, Northwest Queensland

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