This form facilitates retrieval of index properties (aka moisture and density) data stored in the ocean drilling database. The data were acquired in the shipboard environment using a five-cell pycnometer (QuantaChrome) and paired electronic balances (Scientech).
Treat this form as a means to filter for subsets of the available data. Specify the minimum necessary fields to get the data subset you want. For example, if you desire data for one specific hole, you might fill in the leg, site, and hole fields, leaving the remaining fields blank.
If you want to download all Moisture and Density data, leave all the form fields blank--be patient though, the full dataset contains more than 80,000 sample points.
This report is sorted by Method and then by depth. In cases where the sample processing method is not clear, the method will contain a question mark (?).
If this page does not meet your data request needs, please contact the Data Librarian.
Show Data for Method: Use this field to filter for data generated from a specific sample processing method. By default all methods are displayed.
Filter on: Use this field to filter records based on the calculated values of Water Content, Grain Density, Porosity, et cetera. End-points of the value range specified are inclusive.
Depth: Filter the return data by depth. By default data points are filtered based on their mbsf depths. If another depth unit is in effect (see Report Options) then the depth filtering will occur based on those depth values (e.g. mcd).
The basic query output is as follows:
Leg Site H Cor T Sc Top(cm) Bot(cm) Depth (mbsf) WW (%) WD (%) BD (g/cc) DD (g/cc) GD (g/cc) PO (%) VR Method Comments 202 1232 A 1 H 4 74.0 76.0 5.26 30.1 43.0 1.835 1.283 2.784 53.9 1.169 C 202 1232 A 1 H 5 74.0 76.0 6.76 42.0 72.5 1.615 0.936 2.780 66.3 1.970 C 202 1232 A 1 H 6 74.0 76.0 8.26 42.4 73.5 1.612 0.929 2.788 66.7 2.002 C
The precise column delimiters used depend on your Report Options selections. The Output Raw Data field causes additional columns of data to be presented:
Leg Site H Cor T Sc Top(cm) Bot(cm) Depth (mbsf) WW (%) WD (%) BD (g/cc) DD (g/cc) GD (g/cc) PO (%) VR Mt+beak Md+beak Vt+beak sd(Vt+beak) n(Vt+beak) c(Vt+beak) Vd+beak sd(Vd+beak) n(Vd+beak) c(Vd+beak) Date Time Beaker Mbeak Vbeak Mt Md Mpw Ms Vpw Msalt Vsalt Vt Vs Vd Method Comments 202 1232 A 1 H 1 74.0 76.0 0.74 52.6 110.9 1.463 0.694 2.787 75.1 3.018 24.239 15.885 6.471 0.00200 3 2 08-APR-2002 16:15 3 7.773 3.533 16.5 8.1 8.7 7.8 8.5 0.303 0.136 11.256 2.802 2.938 C 202 1232 A 1 H 2 74.0 76.0 2.25 43.0 75.5 1.620 0.923 2.889 68.1 2.131 22.597 16.607 6.656 0.00600 3 3 08-APR-2002 16:15 8 8.169 3.713 14.4 8.4 6.2 8.2 6.1 0.217 0.098 8.907 2.845 2.943 C
The abbreviations used are as defined below. Blank fields are indicative of missing or incomplete data.
This table summarizes the measurement procedures and calculations applied to determine index properties in the ODP laboratory environment.
| Property | Formula | Method A | Method B | Method C | Method D |
|---|---|---|---|---|---|
| Application | |||||
Suitable material: | Soft, saturated | Saturated | Saturated | Unaturated | |
Recommended use: | No | No | Yes | Yes | |
| Measurements (method-specific) | |||||
Total mass, Mt: | Mt | Mt | Mt | - | |
Dry mass, Md: | Md | Md | Md | Md | |
Total volume, Vt: | Vt (fixed) | Vt (pyc) | - | Vt (geom) | |
Dry volume, Vd: | - | - | Vd (pyc) | Vd (pyc) | |
| Assumptions (all methods) | |||||
Density of water: | Dw=1.000 | ||||
Density of pore water: | Dpw=1.024 | ||||
Density of salt: | Dsalt = 2.22 | ||||
Salinity of pore water: | s=35/1000 | ||||
Water ratio: | r=Vw/Vpw=0.988 | ||||
| Method-specific variables Mt, Mpw, Vt, Vpw | |||||
Total mass (calculated): | Mt(calc) = Md+Mw = Md+(Vt-Vd)*1 | - | - | - | Mt(calc) |
Mass of porewater 1: | Mpw1 = (Mt-Md)/(1-s) | Mpw1 | Mpw1 | Mpw1 | - |
Volume of porewater 1: | Vpw1 = Mpw1/Dpw | - | - | Vpw1 | - |
Volume of porewater 2: | Vpw2 = Vw = Vt-Vd | - | - | - | Vpw2 |
Mass of porewater 2: | Mpw2 = Vw*Dpw | - | - | - | Mpw2 |
Total volume: | Vt(calc) = Vd-Vsalt1+Vpw1 | - | - | Vt(calc) | - |
Dry volume: | Vd(calc)=Vs+Vsalt | Vd(calc) | Vd(calc) | - | - |
| Additional variables (using measurements or method-specific variables as applicable) | |||||
Mass of salt: | Msalt = Mpw-(Mt-Md) | ||||
Volume of salt: | Vsalt = Msalt/Dsalt | ||||
Mass of solids: | Ms = Md-Msalt | ||||
Volume of solids: | Vs = Vd-Vsalt | ||||
| Final phase relationships (using measurements or method-specific variables as applicable) | |||||
Water content 1 (wet): | WW = Mpw/Mt | ||||
Water content 2 (dry): | WD = Mpw/Ms | ||||
Bulk density: | BD = Mt/Vt | ||||
Dry density: | DD = Ms/Vt | ||||
Grain density: | GD = Ms/Vs | ||||
Porosity: | PO = Vpw/Vt | ||||
Void ratio: | VR = Vpw/Vs |
The calculations shown are implemented in stored database procedures and within this query function. The Vt measurement for methods A and D is a fixed value; the fixed value is recorded in the database does not include the volume for the beaker used to conduct other measurements on the sample.
This tables provides the basis for the assumptions used above.
| Mass (kg) | Density (kg/m^3) | Volume (m^3) | |
|---|---|---|---|
| 1 ton of seawater | 1000 | 1024 | 0.977 |
| Solid salt | 35 | 2222 | 0.016 |
| Water | 965 | 1000 | 0.965 |
| Dissolved salt | 35 | 3027 | 0.012 |
| r | 0.988 |
The water volume is 0.988 times the pore water volume if the salt is removed.
Last modified Friday, 12-Jan-07 12:30:23