Spence porphyry copper deposit: Hematite (U-Th-Sm)/He geochronology
This spreadsheet contains (U-Th-Sm)/He data for 73 hematite samples from the supergene profile of the Spence porphyry copper deposit in the Central Andes. These data are discussed in the G-cubed publication titled 'A rusty record of weathering and groundwater movement in the hyperarid Central Andes' (Shaw et al., 2021). Spence porphyry copper deposit Drill hole SPD0324, UTM WGS1984 19S, E 474975.22, N 7481100.39 Drill hole SPD 1848, UTM WGS1984 19S, E 474998.29, N 7481399.87 Drill hole SPD 0402, UTM WGS1984 19S, E 473969.87, N 7479755.01
Default
Identification info
- Metadata Language
- English (en)
- Dataset Reference Date ()
- 2021-06-25
University of Bristol
-Joseph Shaw
(PhD student, School of Earth Sciences
)Wills Memorial Building, Queens Road
,Bristol
,BS8 1RJ
,- Maintenance and update frequency
- notApplicable
- GEMET - INSPIRE themes
- BGS Thesaurus of Geosciences
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Uranium
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Helium
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Weathering
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Porphyry copper deposits
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Thorium
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Samarium
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Geochronology
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- Keywords
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NERC_DDC
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- Limitations on Public Access
- otherRestrictions
- Other constraints
- licenceOGL
- Use constraints
- otherRestrictions
- Other constraints
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The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.
- Other constraints
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Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]"
- Spatial representation type
- textTable
- Topic category
-
- Geoscientific information
- Extent
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ANDES [id=842000]
- Dataset Reference Date ()
- 1979
))
- Begin date
- 2017-01-02
- End date
- 2019-03-29
- Additional information
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Royal Society Research Grant RG140683
Spatial Reference System
- Quality Scope
- dataset
- Other
-
dataset
Report
- Dataset Reference Date ()
- 2011
- Explanation
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See the referenced specification
- Degree
Report
- Dataset Reference Date ()
- 2010-12-08
- Explanation
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See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF
- Degree
- Statement
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(U-Th-Sm)/He dating was done at Caltech, using the single aliquot method (Farley, 2002; House et al., 2000). Hematite fragments were loaded into Pt tubes and degassed by incremental heating with a Nd-YAG laser to >1000⁰ C. He extraction conducted under high pO2 (100 torr), buffering the hematite-magnetite transition to >1200° C (Hofmann et al., 2020). Isotope-dilution measurements of 4He were made with an enriched 3He spike, using a Pfeiffer Vacuum quadrupole mass spectrometer. U, Th and Sm were measured on the same aliquots using an Agilent 8800 triple-quadrupole ICP-MS (e.g. Hofmann et al., 2017). (U-Th-Sm)/He ages were calculated according to Farley (2002). Since aliquots were taken from structures much larger than the typical alpha-particle stopping distance in hematite of 13-16 µm (Ketcham et al., 2011), no correction for alpha-ejection or -implantation was applied.
Metadata
- File identifier
- c5e58fbf-dc07-1bbf-e054-002128a47908 XML
- Metadata Language
- English (en)
- Resource type
- dataset
- Metadata Date
- 2023-06-09
- Metadata standard name
- UK GEMINI
- Metadata standard version
-
2.3
British Geological Survey
Environmental Science Centre,Keyworth
,NOTTINGHAM
,NOTTINGHAMSHIRE
,NG12 5GG
,United Kingdom