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Selenium and tellurium concentrations of British coals

Selenium and tellurium concentrations of British coals
Selenium and tellurium concentrations of British coals
Standard mode and collision/reaction cell mass spectroscopy methods have been utilised in order to overcome spectral interferences and provide ultra-low quantification of selenium (Se) and tellurium (Te) in British coals for the first time. The accurate detection of Se and Te in coals is becoming increasingly important, as coals and pyrite have been identified as potentially significant trace element sources. The mean Se concentration of British coals bear comparison to that of world coals, with anomalous Se content (concentrations above 4 mg/kg) across westerly exposures, often coinciding with high sulphur (S) content and visible pyrite. New Te data for British coals gives a mean concentration of 0.02 mg/kg, with anomalous Te in Ayrshire. There is a positive correlation in the Te/Se ratio across the sample set. The close relationship between Se and Te, as well as Se-Te with both early syngenetic and later cleat filling pyrite, confirms an important role for sulphides in Se and Te sequestration in British coals. The high Se-Bowland Shale and/or Ordovician volcanics may have provided the trace element source British coals of similar or younger age. Regional intrusive activity (shallow Se and Te concentrations of British coals LB draft manuscript tabular intrusions or more extensive plutons) and episodes of intense deformation can alter the thermal maturity of coals, and may have driven the movement of trace element-rich fluids through strata, locally enriching coals in Se and Te.
0072-1050
Bullock, Liam
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Parnell, John
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Feldmann, Joerg
792af416-2750-497f-8168-8f7440dfd5c9
Armstrong, Joseph
1d24c89a-37ea-444d-b3a0-669e4c8ed79f
Henn, Alessandra S.
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Mesko, Marcia F.
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Mello, Paola
c4e6887b-9a1b-49cf-91b7-6ce6ce7aca40
Flores, Erico M.m.
a8dfa94e-cc36-4e44-af89-566ea628251b
Bullock, Liam
c6ffb9b0-0a54-4ab2-9edb-f97280e6ce2d
Parnell, John
b86302b0-b930-4b7c-9786-13abc612fef7
Feldmann, Joerg
792af416-2750-497f-8168-8f7440dfd5c9
Armstrong, Joseph
1d24c89a-37ea-444d-b3a0-669e4c8ed79f
Henn, Alessandra S.
4385c414-980a-4fd5-b2e8-d6c2a981ceb3
Mesko, Marcia F.
58af62ba-c148-4a64-8c65-a69bfc501f55
Mello, Paola
c4e6887b-9a1b-49cf-91b7-6ce6ce7aca40
Flores, Erico M.m.
a8dfa94e-cc36-4e44-af89-566ea628251b

Bullock, Liam, Parnell, John, Feldmann, Joerg, Armstrong, Joseph, Henn, Alessandra S., Mesko, Marcia F., Mello, Paola and Flores, Erico M.m. (2018) Selenium and tellurium concentrations of British coals. Geological Journal. (doi:10.1002/gj.3238).

Record type: Article

Abstract

Standard mode and collision/reaction cell mass spectroscopy methods have been utilised in order to overcome spectral interferences and provide ultra-low quantification of selenium (Se) and tellurium (Te) in British coals for the first time. The accurate detection of Se and Te in coals is becoming increasingly important, as coals and pyrite have been identified as potentially significant trace element sources. The mean Se concentration of British coals bear comparison to that of world coals, with anomalous Se content (concentrations above 4 mg/kg) across westerly exposures, often coinciding with high sulphur (S) content and visible pyrite. New Te data for British coals gives a mean concentration of 0.02 mg/kg, with anomalous Te in Ayrshire. There is a positive correlation in the Te/Se ratio across the sample set. The close relationship between Se and Te, as well as Se-Te with both early syngenetic and later cleat filling pyrite, confirms an important role for sulphides in Se and Te sequestration in British coals. The high Se-Bowland Shale and/or Ordovician volcanics may have provided the trace element source British coals of similar or younger age. Regional intrusive activity (shallow Se and Te concentrations of British coals LB draft manuscript tabular intrusions or more extensive plutons) and episodes of intense deformation can alter the thermal maturity of coals, and may have driven the movement of trace element-rich fluids through strata, locally enriching coals in Se and Te.

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Accepted/In Press date: 20 April 2018
e-pub ahead of print date: 26 June 2018

Identifiers

Local EPrints ID: 421692
URI: https://eprints.soton.ac.uk/id/eprint/421692
ISSN: 0072-1050
PURE UUID: cf9f6a2e-148f-40d6-92e9-d6bbce6f2e22

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Date deposited: 21 Jun 2018 16:30
Last modified: 22 May 2019 04:01

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