Iodine content and I-129 isotopic composition in McMurdo lake-bottom sediments

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
the pore waters were collected by centrifuging the wet sediment. Presented in this file is the total iodine content and I-129 isotopic composition of lake-bottom sediments
from Lakes Joyce and Fryxell. An attempt was made to determine the iodine and chlorine isotopic content of gypsum
cored from the bottom of Lake Vanda, but the total iodine content was below detection.