General information
The data posted on this site is managed by Data Integration and Analyses Group, Marine-Earth Data and Information Department. Contact address is 
Precision of sampling point
Please note that sampling points (latitude and longitude) in this database may be a nominal location which means landing / target point of the dive or estimated point of sampling. We don't have enough information on the uncertainty of location.
method information
- Y.Tamura and H.Kawabata(2006-2007,unpublished)
Analytical procedure
After initial splitting and jaw crushing,all samples were pulverized in an alumina ball mill. Major and trace elements were determined by X-ray fluorescence(XRF) at IFREE,JAMSTEC. Trace elemnts were analyzed from pressed powder discs,and major elements were determined from fused glass discs. A mixture of 4 g of each powdered sample and 4 g of anhydrous lithium tetraborate(Li2B4O7) was used; no matrix correction was applied because of the high dilution involved.
History
| Date | Title |
|---|---|
| Sep/2011 | Search Criteria "Thin Section" was added. Reference can be input from a Reference List. |
| Nov/2010 | Thin Section Photos became available. |
| Sep/2010 | Search Criteria "Sample Available" was added. Sort by Terms of Search Results Table was added. |
| Oct/2009 | "Quick Search by Area" was added. |
| Mar/2009 | Started providing metadata to "EarthChem portal". |
| Jan/2009 | Registered 10,000 or more metadata. |
| Oct/2008 | Search by "Reference" was added. |
| Oct/2007 | Search by "Location" was added. |
| Apr/2007 | First version was released. |