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• W2162937090 abstract "Research Article| November 01, 2015 Are aragonite stalagmites reliable paleoclimate proxies? Tests for oxygen isotope time-series replication and equilibrium Matthew S. Lachniet Matthew S. Lachniet † Department of Geoscience, University of Nevada–Las Vegas, 4505 S. Maryland Parkway, Las Vegas, Nevada 89154, USA †matthew.lachniet@unlv.edu Search for other works by this author on: GSW Google Scholar Author and Article Information Matthew S. Lachniet † Department of Geoscience, University of Nevada–Las Vegas, 4505 S. Maryland Parkway, Las Vegas, Nevada 89154, USA †matthew.lachniet@unlv.edu Publisher: Geological Society of America Received: 07 Jul 2014 Revision Received: 15 Feb 2015 Accepted: 18 Mar 2015 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2015 Geological Society of America GSA Bulletin (2015) 127 (11-12): 1521–1533. https://doi.org/10.1130/B31161.1 Article history Received: 07 Jul 2014 Revision Received: 15 Feb 2015 Accepted: 18 Mar 2015 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Matthew S. Lachniet; Are aragonite stalagmites reliable paleoclimate proxies? Tests for oxygen isotope time-series replication and equilibrium. GSA Bulletin 2015;; 127 (11-12): 1521–1533. doi: https://doi.org/10.1130/B31161.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The use of aragonite stalagmites as paleoclimate proxies has become increasingly common because of their often exceptional uranium-series dating precision and fast growth rates, which allow near-annual climate resolution. However, aragonite is known to be susceptible to open-system behavior and may recrystallize to calcite under typical cave conditions. As a result, the fidelity of the oxygen isotopic variations preserved in aragonite stalagmites is not yet as firmly established as for calcite stalagmites, and few studies have investigated oxygen isotope replication and equilibrium with cave drip waters. I present new data and review findings from the literature that show that aragonite stalagmites may pass both the equilibrium and replication tests in some cases, but that other aragonites are clearly precipitated out of equilibrium with cave drip waters. As a case study, δ18O data for three exceptionally well-dated stalagmites from Juxtlahuaca Cave, Mexico, are presented. Two of the stalagmites are aragonite, and the third was measured on a diagenetically calcitized aragonite stalagmite. These results show that the modern aragonite precipitates in apparent oxygen isotopic equilibrium with drip waters, and the two aragonite speleothems replicate strongly over the past 530 yr, thus confirming a common paleoclimate signal. Observations of δ18O systematics in previously published aragonite stalagmite δ18O records from China and Belize show that at least two samples clearly precipitated modern aragonite out of isotopic equilibrium with cave drip waters. Because the equilibrium test only applies to modern precipitation for which temperature and drip-water δ18O values are known, both equilibrium and replication tests are required for confident interpretation of aragonite stalagmite δ18O time series, and studies that fail or do not attempt such tests should be considered cautiously. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W2162937090 date "2015-04-30" @default.
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• W2162937090 title "Are aragonite stalagmites reliable paleoclimate proxies? Tests for oxygen isotope time-series replication and equilibrium" @default.
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• W2162937090 doi "https://doi.org/10.1130/b31161.1" @default.
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