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
dataset
:
http://data.bgs.ac.uk/id/dataHolding/13607774
English
Geoscientific information
GEMET - INSPIRE themes, version 1.0:
BGS Thesaurus of Geosciences:
Helium
Uranium
Porphyry copper deposits
Weathering
NGDC Deposited Data
Thorium
Geochronology
Samarium
Free:
Free:
NERC_DDC
-69.5000,
-22.9400,
-69.0000,
-22.5400
ANDES [id=842000]
creation: 2021-06-25
2017-01-02
-
2019-03-29
text table
University of Bristol
Joseph Shaw
Wills Memorial Building, Queens Road,
Bristol,
BS8 1RJ
email:
not available
Role: originator
British Geological Survey
Enquiries
email:
not available
Role: distributor
British Geological Survey
Enquiries
email:
not available
Role: point of contact
Data Quality
(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.
INSPIRE Implementing rules laying down technical arrangements for the interoperability and harmonisation of Geology
Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
Constraints
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.
Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]"
licenceOGL
Metadata about metadata
c5e58fbf-dc07-1bbf-e054-002128a47908
British Geological Survey
Environmental Science Centre,Keyworth,
NOTTINGHAM,
NG12 5GG,
United Kingdom
tel: +44 115 936 3100
email:
enquiries@bgs.ac.uk
Role: point of contact
2024-04-24