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<title>UTas ePrints - Regional settings of structurally hosted gold mineralization in the Mudgee-Gulgong District, N.S.W.</title>
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<meta content="Watkins, John J." name="eprints.creators_name" />
<meta content="thesis" name="eprints.type" />
<meta content="2008-01-16T23:32:12Z" name="eprints.datestamp" />
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<meta content="Regional settings of structurally hosted gold mineralization in the Mudgee-Gulgong District, N.S.W." name="eprints.title" />
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<meta content="The Mudgee-Gulgong district is located within the exposed northeastern margin of the Lachlan Fold Belt in New South Wales. The district was an important gold mining
centre in the 1800's and produced up to 1 million ounces of gold, mostly from deep
leads. Re-mapping of the area has resulted in a major revision to the stratigraphy and
structural knowledge of the area. Significant changes include the recognition of the
formerly known Early Devonian Burranah Formation as a Late Ordovician volcanic
unit with significant exploration potential for Au-Cu mineralization. Also recognised is a Late Silurian shelf sequence with potential for Au-Cu and base metals overlying the Burranah Formation.
The Burranah Formation is a dominantly submarine, volcano-sedimentary succession
with a complex internal stratigraphy. Two main lithofacies associations can be
recognised on the magnetic images. A lower package, composed mostly of primary
volcanic rocks and minor volcaniclastics is overlain by a package composed dominantly of volcaniclastics and sediments. Small elongate intrusive bodies occur throughout the sequence.
Structural interpretation of the area reveals one dominant D2 deformation (Early
Carboniferous) that produced meridional to northwest-trending folds, cleavage, thrust
faults and oblique-slip faults. A zone of higher strain is developed within the Burranah Formation and is characterised by overturned, tight, F2 folds and considerable shortening.
Mapping and interpretation of the area has been greatly assisted by the availability of
high resolution gravity, magnetic and radiometric data. The interpretation of magnetic
data has considerably enhanced the structural interpretation.
Volcanic and intrusive rocks of the Burranah Formation comprise a coherent calcalkaline suite with a dominantly shoshonitic character. In MORB-normalized plots, they display patterns typical of many modern subduction-related volcanics with a marked depletion of Ta and Nb and similar or lower abundances of the heavy REE and Ti. Positive εNd values indicate a mantle source for the shoshonites with little or no crustal contamination.
Primary gold mineralization in the district occurs in veins and as disseminations in the
structurally more competent rocks adjacent to faults and shear zones in the higher
strain zone. Host rocks are generally intrusive monzodiorites, diorites or coherent
volcanics and range in age from Late Ordovician to Early Devonian. Sulphur and lead
isotope data support a syndeformational model for mineralization with fluids and gold
derived from the host rock sequence." name="eprints.abstract" />
<meta content="1997" name="eprints.date" />
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<meta content="University of Tasmania" name="eprints.institution" />
<meta content="Centre for Ore Deposit and Exploration Studies" name="eprints.department" />
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<meta content="Watkins, John J. (1997) Regional settings of structurally hosted gold mineralization in the Mudgee-Gulgong District, N.S.W. Research Master thesis, University of Tasmania." name="eprints.citation" />
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<meta content="260101 Mineralogy and Crystallography" name="DC.subject" />
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<meta content="The Mudgee-Gulgong district is located within the exposed northeastern margin of the Lachlan Fold Belt in New South Wales. The district was an important gold mining
centre in the 1800's and produced up to 1 million ounces of gold, mostly from deep
leads. Re-mapping of the area has resulted in a major revision to the stratigraphy and
structural knowledge of the area. Significant changes include the recognition of the
formerly known Early Devonian Burranah Formation as a Late Ordovician volcanic
unit with significant exploration potential for Au-Cu mineralization. Also recognised is a Late Silurian shelf sequence with potential for Au-Cu and base metals overlying the Burranah Formation.
The Burranah Formation is a dominantly submarine, volcano-sedimentary succession
with a complex internal stratigraphy. Two main lithofacies associations can be
recognised on the magnetic images. A lower package, composed mostly of primary
volcanic rocks and minor volcaniclastics is overlain by a package composed dominantly of volcaniclastics and sediments. Small elongate intrusive bodies occur throughout the sequence.
Structural interpretation of the area reveals one dominant D2 deformation (Early
Carboniferous) that produced meridional to northwest-trending folds, cleavage, thrust
faults and oblique-slip faults. A zone of higher strain is developed within the Burranah Formation and is characterised by overturned, tight, F2 folds and considerable shortening.
Mapping and interpretation of the area has been greatly assisted by the availability of
high resolution gravity, magnetic and radiometric data. The interpretation of magnetic
data has considerably enhanced the structural interpretation.
Volcanic and intrusive rocks of the Burranah Formation comprise a coherent calcalkaline suite with a dominantly shoshonitic character. In MORB-normalized plots, they display patterns typical of many modern subduction-related volcanics with a marked depletion of Ta and Nb and similar or lower abundances of the heavy REE and Ti. Positive εNd values indicate a mantle source for the shoshonites with little or no crustal contamination.
Primary gold mineralization in the district occurs in veins and as disseminations in the
structurally more competent rocks adjacent to faults and shear zones in the higher
strain zone. Host rocks are generally intrusive monzodiorites, diorites or coherent
volcanics and range in age from Late Ordovician to Early Devonian. Sulphur and lead
isotope data support a syndeformational model for mineralization with fluids and gold
derived from the host rock sequence." name="DC.description" />
<meta content="1997" name="DC.date" />
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<h1 class="ep_tm_pagetitle">Regional settings of structurally hosted gold mineralization in the Mudgee-Gulgong District, N.S.W.</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Watkins, John J.</span> (1997) <xhtml:em>Regional settings of structurally hosted gold mineralization in the Mudgee-Gulgong District, N.S.W.</xhtml:em> Research Master thesis, University of Tasmania.</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a onmouseover="EPJS_ShowPreview( event, 'doc_preview_4146' );" onmouseout="EPJS_HidePreview( event, 'doc_preview_4146' );" href="http://eprints.utas.edu.au/3043/1/1_front.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" border="0" class="ep_doc_icon" /></a><div class="ep_preview" id="doc_preview_4146"><table><tr><td><img alt="" src="http://eprints.utas.edu.au/3043/thumbnails/1/preview.png" border="0" class="ep_preview_image" /><div class="ep_preview_title">Preview</div></td></tr></table></div></td><td valign="top"><a href="http://eprints.utas.edu.au/3043/1/1_front.pdf"><span class="ep_document_citation">PDF (Front Matter)</span></a> - Requires a PDF viewer<br />91Kb</td></tr><tr><td valign="top" style="text-align:center"><a onmouseover="EPJS_ShowPreview( event, 'doc_preview_4147' );" onmouseout="EPJS_HidePreview( event, 'doc_preview_4147' );" href="http://eprints.utas.edu.au/3043/2/2_intro.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" border="0" class="ep_doc_icon" /></a><div class="ep_preview" id="doc_preview_4147"><table><tr><td><img alt="" src="http://eprints.utas.edu.au/3043/thumbnails/2/preview.png" border="0" class="ep_preview_image" /><div class="ep_preview_title">Preview</div></td></tr></table></div></td><td valign="top"><a href="http://eprints.utas.edu.au/3043/2/2_intro.pdf"><span class="ep_document_citation">PDF (Chapter 1 - Introduction)</span></a> - Requires a PDF viewer<br />101Kb</td></tr><tr><td valign="top" style="text-align:center"><a onmouseover="EPJS_ShowPreview( event, 'doc_preview_4148' );" onmouseout="EPJS_HidePreview( event, 'doc_preview_4148' );" href="http://eprints.utas.edu.au/3043/3/3_regional-geological-setting.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" border="0" class="ep_doc_icon" /></a><div class="ep_preview" id="doc_preview_4148"><table><tr><td><img alt="" src="http://eprints.utas.edu.au/3043/thumbnails/3/preview.png" border="0" class="ep_preview_image" /><div class="ep_preview_title">Preview</div></td></tr></table></div></td><td valign="top"><a href="http://eprints.utas.edu.au/3043/3/3_regional-geological-setting.pdf"><span class="ep_document_citation">PDF (Chapter 2 - Regional Geological Setting)</span></a> - Requires a PDF viewer<br />1279Kb</td></tr><tr><td valign="top" style="text-align:center"><a onmouseover="EPJS_ShowPreview( event, 'doc_preview_4149' );" onmouseout="EPJS_HidePreview( event, 'doc_preview_4149' );" href="http://eprints.utas.edu.au/3043/4/4_geophysics.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" border="0" class="ep_doc_icon" /></a><div class="ep_preview" id="doc_preview_4149"><table><tr><td><img alt="" src="http://eprints.utas.edu.au/3043/thumbnails/4/preview.png" border="0" class="ep_preview_image" /><div class="ep_preview_title">Preview</div></td></tr></table></div></td><td valign="top"><a href="http://eprints.utas.edu.au/3043/4/4_geophysics.pdf"><span class="ep_document_citation">PDF (Chapter 3 - Geophysics)</span></a> - Requires a PDF viewer<br />2169Kb</td></tr><tr><td valign="top" style="text-align:center"><a onmouseover="EPJS_ShowPreview( event, 'doc_preview_4150' );" onmouseout="EPJS_HidePreview( event, 'doc_preview_4150' );" href="http://eprints.utas.edu.au/3043/5/5_geochemistry.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" border="0" class="ep_doc_icon" /></a><div class="ep_preview" id="doc_preview_4150"><table><tr><td><img alt="" src="http://eprints.utas.edu.au/3043/thumbnails/5/preview.png" border="0" class="ep_preview_image" /><div class="ep_preview_title">Preview</div></td></tr></table></div></td><td valign="top"><a href="http://eprints.utas.edu.au/3043/5/5_geochemistry.pdf"><span class="ep_document_citation">PDF (Chapter 4 - Geochemistry)</span></a> - Requires a PDF viewer<br />327Kb</td></tr><tr><td valign="top" style="text-align:center"><a onmouseover="EPJS_ShowPreview( event, 'doc_preview_4151' );" onmouseout="EPJS_HidePreview( event, 'doc_preview_4151' );" href="http://eprints.utas.edu.au/3043/6/6_mineralization.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" border="0" class="ep_doc_icon" /></a><div class="ep_preview" id="doc_preview_4151"><table><tr><td><img alt="" src="http://eprints.utas.edu.au/3043/thumbnails/6/preview.png" border="0" class="ep_preview_image" /><div class="ep_preview_title">Preview</div></td></tr></table></div></td><td valign="top"><a href="http://eprints.utas.edu.au/3043/6/6_mineralization.pdf"><span class="ep_document_citation">PDF (Chapter 5 - Mineralization)</span></a> - Requires a PDF viewer<br />724Kb</td></tr><tr><td valign="top" style="text-align:center"><a onmouseover="EPJS_ShowPreview( event, 'doc_preview_4152' );" onmouseout="EPJS_HidePreview( event, 'doc_preview_4152' );" href="http://eprints.utas.edu.au/3043/7/7_conclusion-refs.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" border="0" class="ep_doc_icon" /></a><div class="ep_preview" id="doc_preview_4152"><table><tr><td><img alt="" src="http://eprints.utas.edu.au/3043/thumbnails/7/preview.png" border="0" class="ep_preview_image" /><div class="ep_preview_title">Preview</div></td></tr></table></div></td><td valign="top"><a href="http://eprints.utas.edu.au/3043/7/7_conclusion-refs.pdf"><span class="ep_document_citation">PDF (Conclusions, References and Maps)</span></a> - Requires a PDF viewer<br />3233Kb</td></tr></table><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">The Mudgee-Gulgong district is located within the exposed northeastern margin of the Lachlan Fold Belt in New South Wales. The district was an important gold mining
centre in the 1800's and produced up to 1 million ounces of gold, mostly from deep
leads. Re-mapping of the area has resulted in a major revision to the stratigraphy and
structural knowledge of the area. Significant changes include the recognition of the
formerly known Early Devonian Burranah Formation as a Late Ordovician volcanic
unit with significant exploration potential for Au-Cu mineralization. Also recognised is a Late Silurian shelf sequence with potential for Au-Cu and base metals overlying the Burranah Formation.
The Burranah Formation is a dominantly submarine, volcano-sedimentary succession
with a complex internal stratigraphy. Two main lithofacies associations can be
recognised on the magnetic images. A lower package, composed mostly of primary
volcanic rocks and minor volcaniclastics is overlain by a package composed dominantly of volcaniclastics and sediments. Small elongate intrusive bodies occur throughout the sequence.
Structural interpretation of the area reveals one dominant D2 deformation (Early
Carboniferous) that produced meridional to northwest-trending folds, cleavage, thrust
faults and oblique-slip faults. A zone of higher strain is developed within the Burranah Formation and is characterised by overturned, tight, F2 folds and considerable shortening.
Mapping and interpretation of the area has been greatly assisted by the availability of
high resolution gravity, magnetic and radiometric data. The interpretation of magnetic
data has considerably enhanced the structural interpretation.
Volcanic and intrusive rocks of the Burranah Formation comprise a coherent calcalkaline suite with a dominantly shoshonitic character. In MORB-normalized plots, they display patterns typical of many modern subduction-related volcanics with a marked depletion of Ta and Nb and similar or lower abundances of the heavy REE and Ti. Positive εNd values indicate a mantle source for the shoshonites with little or no crustal contamination.
Primary gold mineralization in the district occurs in veins and as disseminations in the
structurally more competent rocks adjacent to faults and shear zones in the higher
strain zone. Host rocks are generally intrusive monzodiorites, diorites or coherent
volcanics and range in age from Late Ordovician to Early Devonian. Sulphur and lead
isotope data support a syndeformational model for mineralization with fluids and gold
derived from the host rock sequence.</p></div><table style="margin-bottom: 1em" border="0" cellpadding="3" class="not_ep_block"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Thesis (Research Master)</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/260101.html">260000 Earth Sciences > 260100 Geology > 260101 Mineralogy and Crystallography</a><br /><a href="http://eprints.utas.edu.au/view/subjects/260100.html">260000 Earth Sciences > 260100 Geology</a></td></tr><tr><th valign="top" class="ep_row">Collections:</th><td valign="top" class="ep_row">UNSPECIFIED</td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">3043</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Ms Sandy von Allmen</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">17 Jan 2008 10:32</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">17 Jan 2008 10:32</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=3043;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&eprintid=3043">item control page</a></p>
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