Origins of Chalcocite Defined by Copper Isotope Values

• DOI: 10.1155/2018/5854829
• Publication Date: 2018-01-28T18:31:28Z
• Authors: R. Mathur; H. Falck; E. Belogub; J. Milton; M. Wilson; A. Rose; W. Powell
• Keywords: QE1-996.5; Geology; 01 natural sciences; 0105 earth and related environmental sciences

The origin of chalcocite is explored through a comparison the copper isotope values this mineral from supergene enrichment, sedimentary copper/red bed, and high-temperature hypogene mineralization around world. Data literature data presented here <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mo stretchy="false">(</mml:mo><mml:mi>n</mml:mi><mml:mo>=</mml:mo><mml:mn fontstyle="italic">361</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math> reveal that has tightest cluster id="M2"><mml:mi>δ</mml:mi><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">C</mml:mi><mml:mi mathvariant="normal">u</mml:mi></mml:mrow><mml:mprescripts /><mml:none /><mml:mrow><mml:mn fontstyle="italic">65</mml:mn></mml:mrow></mml:mmultiscripts><mml:mo>=</mml:mo><mml:mn fontstyle="italic">0</mml:mn><mml:mo>±</mml:mo><mml:mn fontstyle="italic">0.6</mml:mn></mml:math> in to bed id="M3"><mml:mi>δ</mml:mi><mml:mmultiscripts><mml:mrow><mml:mi fontstyle="italic">65</mml:mn></mml:mrow></mml:mmultiscripts><mml:mo>=</mml:mo><mml:mo>-</mml:mo><mml:mn fontstyle="italic">0.9</mml:mn><mml:mo>±</mml:mo><mml:mn fontstyle="italic">1.0</mml:mn></mml:math> enrichment id="M4"><mml:mi>δ</mml:mi><mml:mmultiscripts><mml:mrow><mml:mi fontstyle="italic">65</mml:mn></mml:mrow></mml:mmultiscripts><mml:mo>=</mml:mo><mml:mo>+</mml:mo><mml:mn fontstyle="italic">1.9</mml:mn><mml:mo>±</mml:mo><mml:mn fontstyle="italic">1.8</mml:mn></mml:math>. Although errors means overlap, large portions lie different values, allowing for distinguishing ranges id="M5"><mml:mi>δ</mml:mi><mml:mmultiscripts><mml:mrow><mml:mi fontstyle="italic">65</mml:mn></mml:mrow></mml:mmultiscripts></mml:math> &lt;−1<mml:math id="M6"><mml:mrow><mml:mtext>‰</mml:mtext></mml:mrow></mml:math> between id="M7"><mml:mo>-</mml:mo><mml:mn fontstyle="italic">1</mml:mn></mml:math> id="M8"><mml:mo>+</mml:mo><mml:mn hypogene, &gt;+1 chalcocite. are caused by redox reactions associated with dissolution transport copper, whereas tighter range minerals processes active equilibrium conditions.