USGS-NoGaDat: A Global Dataset of Noble Gas Concentrations and Their Isotopic Ratios in Volcanic Systems

The database (Version 1.0) is a MS-Excel file that contains close to 5,000 entries of published information on noble gas concentrations and isotopic ratios from volcanic systems in Mid-Ocean ridges, ocean islands, seamounts, and oceanic and continental arcs (location map). Where they were available we also included the isotopic ratios of strontium, neodymium, and carbon. The database is sub-divided both into material sampled (e.g., volcanic glass, different minerals, fumarole, spring), and into different tectonic settings (MOR, ocean islands, volcanic arcs). Included is also a reference list in MS-Word and pdf from which the data was derived. The database extends previous compilations by Ozima (1994), Farley and Neroda (1998), and Graham (2002). The extended database allows scientists to test competing hypotheses, and it provides a framework for analysis of noble gas data during periods of volcanic unrest. There are six spreadsheets in the MS-Excel file: 1. Master sheet - contains all the compiled data 2. MOR - data from mid-ocean ridges 3. HotSpot-cont. - data from off-ridge hot spots and continental interiors 4. Arc- data from volcanic arcs 5. Solid - data on noble gases extracted from solid material 6. Fluid - data obtained on noble gases dissolved in liquid or gas and vapor phase [Summary provided by the USGS.]