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UID:20250312T185559EDT-5828zmJ4nJ@132.216.98.100
DTSTAMP:20250312T225559Z
DESCRIPTION:How to join: Email sarah.bodeving [at] mail.mcgill.ca (subject:
  SEG%20Zoom%20link%20for%20Dr.%20Paisley%20)  (Sarah Bodeving) for Zoom li
 nk or check EARTHSCI email. \n\n \n\nSpeaker: Dr. Rebecca Paisley\, EPS Al
 umnus 2019\n\n \n\nTitle: Exploration for lithium-enriched geothermal wate
 rs in Cornwall\n\n\n	Elevated lithium concentrations were first reported in
  Cornish geothermal waters in 1864 (at 60mg/l) [1]\, and subsequently note
 d in tin and copper mines (typically ~200 mg/l) [2] that were worked until
  the 1990’s\, when poor metal prices brought an end to metalliferous minin
 g in the South West. Today\, Cornish waters are of significant interest du
 e to an increasing demand for Li in low-carbon technologies and advances i
 n techniques for Li extraction from waters and brines.\n\n	Cornish Lithium’
 s exploration efforts take a multitude of approaches to constrain the rela
 tionship between circulating waters and the underlying regional batholith.
  Mineralogy and chemical analyses highlight five types of granites (G1-G5)
  in Cornwall [3]. In certain granite types\, Lithium is hosted by Lithium 
 bearing micas [3]. Collation of chemical water data across the region link
  certain hydrothermally derived waters to specific granite types\, Li enri
 chment is particularly noted with respect to the G5 granites. Structural m
 apping in combination with digitised archived mine data and private collec
 tions are used to model the deep-seated NW-SE and ENE-WSW trending\, perme
 able fault structures in 3D. These structures were exploited by fluxing Pe
 rmian-aged magmatic-hydrothermal waters that led to mineralisation of W\, 
 Cu and Sn. It is supposed that geothermal waters still circulate at depth\
 , heated by the radiogenic granites.\n\n	Research boreholes have intersecte
 d permeable structures at depth allowing sampling of uncontaminated\, circ
 ulating waters to assess the Li concentrations. Further research into temp
 erature dependent\, water-rock interactions (e.g. Li leaching\, mica break
 down) and porosity and permeability modelling of flow pathways are vital t
 o understanding the origins and distribution of Li-enriched waters at dept
 h. Combining these approaches is informing Cornish Lithium’s exploration p
 rogramme into the viability of Lithium extraction.\n\n	[1] Miller W. A. (18
 64) Chemical News\, Vol X\, No. 254\, p 181.\n\n	[2] Smedley P. L. et al. (
 1989) BGS Research Report SD/89/2.\n\n	[3] Simons B. (2016) Lithos\, Vol 26
 0\, p 76-94.\n\n
DTSTART:20200521T160000Z
DTEND:20200521T170000Z
SUMMARY:Online SEG Talk by Dr. Rebecca Paisley 
URL:/eps/channels/event/online-seg-talk-dr-rebecca-pai
 sley-322264
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