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                <title xml:lang="en">Use of porphyry indicator zircons (PIZs) in the sedimentary record as an exploration tool for covered porphyry copper deposits in the Atacama Desert, Chile</title>
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                <term xml:lang="en">Northern Chile</term>
                <term xml:lang="en">Porphyry Indicator Zircon (PIZ)</term>
                <term xml:lang="en">Atacama gravels</term>
                <term xml:lang="en">Porphyry copper deposits</term>
                <term xml:lang="en">Exotic copper deposits</term>
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              <p>This work explores the potential of geochemical and petrographic characteristics of detrital zircons coming from the sedimentary record of the Centinela District in Northern Chile to identify the presence of buried porphyry copper deposits under a transported gravel cover. The sampled sedimentary section was recovered from the pit of the exotic copper deposit of El Tesoro, located approximately 2 and 4 km west of the Esperanza and Mirador porphyries, respectively. The sedimentary cover comprises four units, Tesoro II, Tesoro III, Arrieros and Recent gravels, deposited since the late Cenozoic in an arid continental environment dominated by alluvial fans. Except for the Tesoro III gravels, all other units contain exotic-Cu mineralisation. In order to interpret the geochemical footprint of the investigated zircons, the Porphyry Indicator Zircon (PIZ) concept (Pizarro et al., 2020) is used. A PIZ need to comply with each of the following geochemical values: Hf &amp;gt;8,750 (ppm), Ce/Nd &amp;gt;1, Eu/Eu* &amp;gt;0.4, 10,000×(Eu/Eu*)/Y &amp;gt;1, (Ce/Nd)/Y &amp;gt;0.01, Dy/Yb &amp;lt;0.3 and 0.1 &amp;lt; Th/U &amp;lt; 1. These zircons also have Ti &amp;lt;9 ppm and Ce/Ce* &amp;lt;100 and usually show euhedral morphologies characterised by prismatic forms of type {110}. The geochemical and petrographic characteristics of the PIZs collected in the gravels are similar to zircons from the nearby Mirador and Esperanza  orphyries. The highest PIZ concentration coincides with the gravel horizons with exotic-Cu mineralisation. Therefore, the PIZs found in the sedimentary record are a potential tracer of adjacent copper porphyries and represent a promising exploration tool for this type of hidden ore deposits in challenging sediment-covered areas.</p>
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