Imperial College London
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ProfessorJamieWilkinson

Faculty of Engineering, Department of Earth Science & Engineering

Professor of Geology
 
 
 
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Contact

 

j.wilkinson Website

 
 
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Location

 

PA418Natural History MuseumNatural History Museum

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Summary

 

Publications

Citation

BibTex format

@article{Riveros:2022:10.1007/s00126-021-01058-z,
author = {Riveros, Jensen K and Campos, E and Wilkinson, J and Wilkinson, C and Kearsley, A and Miranda-Diaz, G and Veliz, W},
doi = {10.1007/s00126-021-01058-z},
journal = {Mineralium Deposita: international journal of geology, mineralogy, and geochemistry of mineral deposits},
pages = {279--300},
title = {Hydrothermal fluid evolution in the Escondida porphyry copper deposit, northern Chile: evidence from SEM-CL imaging of quartz veins and LA-ICP-MS of fluid inclusions},
url = {http://dx.doi.org/10.1007/s00126-021-01058-z},
volume = {57},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The origin of hypogene alteration and mineralization features in the Escondida 27porphyry Cu deposit resulted from intense overprinting related to three main hydrothermal 28stages. The beginning of each stage is recorded by deposition of bright quartz crystals on 29vein  walls  that  precipitated  from high-temperature  fluids.  In  the  deepest  zones  of  the 30deposit,  the  earliest  stage  started  with  exsolution  of  intermediate-density  fluids,  which 31transported  high  concentrations  of  Cu,  whereas  Mo  was  not  detected.  However,  in  the 32shallow zones, the early stage began with depressurization and unmixing of intermediate-33density fluids, which generated both a hypersaline and vapour-rich fluid phase, producing 34an  important  geochemical  segregation  between  both  phases. The  transitional  stage  also 35started  with  circulation  of  intermediate-density  fluids  but  never  experienced  unmixing. 36These fluids transported the highest Mo concentrations in the deposit; however, Cu displays 37lower  concentrations  relative  to  intermediate-density  fluids  from  the  early  stage.  The 38beginning of the late stage was also associated with intermediate-density fluids; however, 39Cu  and  Mo  were  below  the  detection  limits  in  most  of  the  analysed  fluids. During  the 40evolution of the three stages, the fluids experienced gradual cooling, which promoted the 41precipitation  of  euhedral  and  zoned  quartz  crystals  that  overgrew  the  early  high-42luminescence  quartz  generations.  Sometimes,  sulfide  minerals  display  euhedral  crystal 43boundaries with zoned quartz, suggesting that mineralization started during these phases.44The latest events detected in each main stage are linked to cooler and low-salinity fluids, from  which  dark  quartz and  hypogene  sulfide sprecipitated  along  microfractures  and 46interstitial spaces developed in the earlier quartz generations.
AU  - Riveros,Jensen K
AU  - Campos,E
AU  - Wilkinson,J
AU  - Wilkinson,C
AU  - Kearsley,A
AU  - Miranda-Diaz,G
AU  - Veliz,W
DO  - 10.1007/s00126-021-01058-z
EP  - 300
PY  - 2022///
SN  - 0026-4598
SP  - 279
TI  - Hydrothermal fluid evolution in the Escondida porphyry copper deposit, northern Chile: evidence from SEM-CL imaging of quartz veins and LA-ICP-MS of fluid inclusions
T2  - Mineralium Deposita: international journal of geology, mineralogy, and geochemistry of mineral deposits
UR  - http://dx.doi.org/10.1007/s00126-021-01058-z
UR  - http://hdl.handle.net/10044/1/89904
VL  - 57
ER  -
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