Clumped C-O isotope temperature constraints for carbonate precipitation associated with Irish-type Zn-Pb orebodies
Files in This Item:
|51_Hollis_et_al_17_SGA_Quebec-FINAL.pdf||599.8 kB||Adobe PDF||Download|
|Title:||Clumped C-O isotope temperature constraints for carbonate precipitation associated with Irish-type Zn-Pb orebodies||Authors:||Hollis, Steven P.
|Permanent link:||http://hdl.handle.net/10197/9359||Date:||23-Aug-2017||Abstract:||Ireland hosts the greatest concentration of discovered zinc per square kilometre on Earth, with production from 5 carbonate-hosted deposits, including the giant Navan deposit. Clumped C-O isotope analyses of carbonates offer a powerful new technique to directly deliver accurate fluid temperatures and precise calculations of fluid O isotope compositions, offering a significant opportunity to refine the evolving genetic models, and develop new vectoring tools for exploration. We present the first clumped C-O isotope results for parageneticallyconstrained carbonate generations from a number of Irishtype Zn-Pb deposits. Preliminary analysis of hanging-wall white matrix breccias from Lisheen show non-systematic temperature variation (~100 to 170°C), with fluid d18OV-SMOW increasing with temperature. Significant variations in temperature at the thin section scale may be indicative of fluid mixing and/or multiple phases of WMB dolomite brecciation. Post-ore pink dolomite at Lisheen, and crosscutting calcite veins formed at significantly lower temperatures (67 to 42°C). Temperatures of 61 to 110°C were obtained for sphalerite-bearing calcite veins in the hanging-wall of the Randalstown Fault near Navan. These veins contain coarse sphalerite interpreted to have been remobilised from the nearby Navan orebody by a single, cool fluid (Marks, 2015). Clumped C-O data will also be presented for samples from Galmoy, Kilbricken and Castlegard ("Pallas Green"), from which existing fluid inclusion constraints are available.||Funding Details:||Science Foundation Ireland||Type of material:||Conference Publication||Keywords:||Zinc;Lead||Language:||en||Status of Item:||Not peer reviewed||Conference Details:||SGA Quebec 2017 14th Biennial Meeting, Quebec City, Canada, 20-23 August 2017|
|Appears in Collections:||Earth Sciences Research Collection|
ICRAG Research Collection
Show full item record
This item is available under the Attribution-NonCommercial-NoDerivs 3.0 Ireland. No item may be reproduced for commercial purposes. For other possible restrictions on use please refer to the publisher's URL where this is made available, or to notes contained in the item itself. Other terms may apply.