uid=MCM,o=EDI,dc=edirepository,dc=org all public read snyder_salts Glen Snyder

Earth Science-MS 126 Houston TX 77251 US

(713) 348-4054 gsnyder@rice.edu McMurdo Dry Valleys LTER http://mcmlter.org/ Chris Gardner gardner.177@osu.edu https://orcid.org/0000-0003-0400-3754 data manager Inigo San Gil

Department of Biology, MSC03 2020 University of New Mexico Albuquerque NM 87131 US

(505) 277-2625 (505) 277-2541 isangil@lternet.edu data manager 2014-01-01 English

As part of a collaborative investigation between researchers at Rice University, Arkansas State University, University of Rochester, and Ohio State University, lakes of the McMurdo Dry Valleys were sampled at discreet depth intervals during the 2005-2006 field season.  Sample splits were subsequently analyzed for chemical and isotopic composition of both gases and dissolved  ions, as well as dissolved organic carbon. In addition, cryogenic salts were sampled in the surrounding lake shores in order to determine the salt sources. Gravity cores were also obtained and in the case of Lake Vanda, a white precipitate was recovered from the lake bottom.              Presented  in this file is the mineralogic composition of salt crusts that were collected on the surface of sediment and rocks surrounding the lakes, as well as the lake-bottom precipitate from Lake Vanda.  The results are based on low-temperature XRD determinations, and Rietveld refinement of whole peaks.             

chemical properties chemistry lakes limnology LTER Controlled Vocabulary chemistry Cl-36 evaporite halogen I-129 lake limnology sediment Station Keywords inorganic nutrients LTER Core Areas This material is based upon work supported by the National Science Foundation under Grant No.0440686

This data package is released under the Creative Commons Attribution 4.0 International License (CC BY 4.0; http://creativecommons.org/licenses/by/4.0/), which allows consumers (hereinafter referred to as “Data Users”) to freely reuse, redistribute, transform, or build on this work (even commercially) so long as appropriate credit is provided. Accordingly, Data Users are required to properly cite this data package in any publications or in the metadata of any derived products that result from its use (in whole or in part). A recommended citation is provided on the summary metadata page associated with this data package in the McMurdo Dry Valleys LTER Data Catalog (https://mcmlter.org/data), and a generic citation may be found on the summary metadata page in the repository where this data package was obtained. When these data contribute significantly to the contents of a publication, Data Users must also acknowledge that data were provided by the NSF-supported McMurdo Dry Valleys Long Term Ecological Research program (OPP-2224760). This data package has been released in the spirit of open scientific collaboration. Hence, Data Users are strongly encouraged to consider consultation, collaboration, and/or co-authorship (as appropriate) with the data package creator(s). Data Users should be aware these data may be actively used by others for ongoing research; thus, coordination may be necessary to prevent duplicate publication. Data Users should also recognize that misinterpretation of data may occur if they are used outside the context of the original study. Hence, Data Users are urged to contact the data package creator(s) if they have any questions regarding methodology or results. While substantial efforts are made to ensure the accuracy of this data package (with all its components), complete accuracy cannot be guaranteed. Periodic updates to this data package may occur, and it is the responsibility of Data Users to check for new versions. This data package is made available “as is” and comes with no warranty of accuracy or fitness for use. The creator(s) of this data package and the repository where these data were obtained shall not be liable for any damages resulting from misinterpretation, use, or misuse of these data. Finally, as a professional courtesy, we kindly request Data Users notify the primary contact referenced in the metadata when these data are used in the production of any derivative work or publication. Notification should include an explanation of how the data were used, along with a digital copy of the derived product(s). Thank you.

https://mcm.lternet.edu/content/mineralogic-composition-cryogenic-evaporites-determined-low-temperature-x-ray-diffactometry 2005-12-21 2005-12-27 Metadata completed in 2016 This dataset was created Oct 1, 2008 by MCM-LTER information manager (Chris Gardner) after email discussion with PI Glen Snyder. McMurdo Dry Valleys LTER http://mcmlter.org/ McMurdo Dry Valleys LTER http://mcmlter.org/ McMurdo Dry Valleys LTER

 Salts were collected in the areas surrounding the Dry Valley lakes. The samples were bagged and then placed either in boxes or in plastic containers in order to avoid crushing them. The samples were stored in a freezer at -40 C, prior to shipping, due to the instability of Antarcticite at room temperatures. The samples were then shipped under dry ice to Rice University in Houston, then shipped to the Steacie Institute for Molecular Sciences  in Ottawa, which is a division of the Canadian Research Council.            Hailong Lu, a research scientist in the Institute whose specialty is on the structure of marine gas hydrates, placed each sample in a mortar with liquid nitrogen and then ground it into a powder. The powders were then analyzed with a low-temperature XRD. Temperatures were first dropped to -140 C, then gradually  ramped up to room temperature to look at phase changes that occurred on warming. Minerals were identified JADE 8.5 data processing software, and the ICDD PDF-2 Data Base. The relative abundance of each crygenic mineral was dertermined by the Rietveld method of whole-peak fitting.  

ANCILLARY_SNYDER_SALTS ANCILLARY_SNYDER_SALTS.csv 4210 27 1 \n column , " https://mcm.lternet.edu/sites/default/files/ANCILLARY_SNYDER_SALTS.csv DATASET_CODE DATASET_CODE Table Identifier string Table Identifier LOCATION_NAME Location Name Name of lake where measurement was made string Name of lake where measurement was made Location_Type Location_Type Sample type description and/or location string Sample type description and/or location Sample_ID Sample_ID Sample identification code string Sample identification code Latitude Latitude Sample Latitude degree real Null None given Longitude Longitude Sample Longitude degree real Null None given Date_time Date_time Date sample was collected date mm/dd/yyyy Halite Halite Percent composition of halite dimensionless real 0 100 NULL None given Antarcticite Antarcticite Percent composition of Antarcticite dimensionless real 0 100 NULL None given Thenardite Thenardite Percent composition of Thenardite dimensionless real 0 100 NULL None given Mirabilite Mirabilite Percent composition of Mirabilite dimensionless real 0 100 NULL None given Gypsum Gypsum Percent composition of Gypsum dimensionless real 0 100 NULL None given Calcite Calcite Percent composition of Calcite dimensionless real 0 100 NULL None given Aragonite Aragonite Percent composition of Aragonite dimensionless real 0 100 NULL None given Quartz Quartz Percent composition of Quartz dimensionless real 0 100 NULL None given Albite Albite Percent composition of Albite dimensionless real 0 100 NULL None given