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

@inbook{Wilkinson:2017:10.4095/306305,
author = {Wilkinson, JJ and Cooke, D and Baker, M and Chang, Z and Wilkinson, C and Chen, H and Fox, N and Hollings, P and White, N and Gemmell, JB and Loader, M and Pacey, A and Sievwright, R and Hart, L and Brugge, E},
booktitle = {Application of indicator mineral methods to bedrock andsediments},
doi = {10.4095/306305},
editor = {McClenaghan and Layton-Matthews},
pages = {67--77},
publisher = {Geological Survey of Canada},
title = {Porphyry indicator minerals and their mineral chemistry as vectoring and fertility tools},
url = {http://dx.doi.org/10.4095/306305},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - CHAP
AB  - Intrusion-centred mineral districts host a diversity of ore deposits of variable metal associations, alteration assemblages and genesis. Porphyry systems represent particularly important exploration targets but the prioritization of conventional geochemical or geophysical anomalies that might represent a deposit, particularly when systems are buried under cover, is extremely difficult. Three key questions arise: (1) is the alteration (particularly when only a propylitic type is observed) related to a porphyry system? (2) how can the fertility of a system be assessed at an early stage of exploration in order to reduce exploration risk? and (3) how can the centre of the system (in 3 dimensions) be predicted ahead of extensive, potentially deep, drilling? These fertility and vectoring challenges have been the subject of recent work, primarily based on mineral chemistry, in a series of AMIRA projects based out of the University of Tasmania, now also being continued at the Natural History Museum in London.The approach to assessing the presence of a possible porphyry system has been to establish mineral chemical criteria that discriminate between porphyry and non-porphyry environments based on: (1) the composition of igneous minerals (e.g. plagioclase, zircon, apatite, magnetite); and (2) the composition of hydrothermal alteration phases, particularly those developed in the propylitic domain (epidote, chlorite, magnetite, calcite, quartz). Many of these phases may be reworked via erosion into paleo or modern sediment transport systems and are thus available for assessment of catchment area fertility. Some of the characteristics of these minerals may allow the distinction between extensively mineralized and ostensibly barren environments (the system “fertility”); clearly these features are of significant exploration utility.The vectoring challenge has been addressed by the completion of numerous orientation studies on known porphyry systems to establish any sys
AU  - Wilkinson,JJ
AU  - Cooke,D
AU  - Baker,M
AU  - Chang,Z
AU  - Wilkinson,C
AU  - Chen,H
AU  - Fox,N
AU  - Hollings,P
AU  - White,N
AU  - Gemmell,JB
AU  - Loader,M
AU  - Pacey,A
AU  - Sievwright,R
AU  - Hart,L
AU  - Brugge,E
DO  - 10.4095/306305
EP  - 77
PB  - Geological Survey of Canada
PY  - 2017///
SP  - 67
TI  - Porphyry indicator minerals and their mineral chemistry as vectoring and fertility tools
T1  - Application of indicator mineral methods to bedrock andsediments
UR  - http://dx.doi.org/10.4095/306305
UR  - http://www.nrcan.gc.ca/earth-sciences/science/geology/gsc/17100
UR  - http://hdl.handle.net/10044/1/55995
ER  -
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