Chemical stratigraphy of Grande Ronde Basalt, Pasco Basin, south-central Washington

Conference · Fri Feb 01 04:00:00 EST 1980

OSTI ID:5431481

Long, P E; Ledgerwood, R K; Myers, C W; Reidel, S P; Landon, R D; Hooper, P R

Grande Ronde Basalt in the Pasco Basin, south-central Washington, can be subdivided into three chemical types and two chemical subtypes based on x-ray fluorescence major element analysis of samples from seven deep core holes and three surface sections. These chemical types are: (1) high-Mg Grande Ronde chemical type; (2) low-Mg Grande Ronde chemical type; (3) low-K (very high-Mg.) Grande Ronde chemical type; and (4) Umtanum Grande Ronde chemical subtype. A possible fifth subdivision is the McCoy Canyon Grande Ronde chemical subtype. The Umtanum and the McCoy Canyon subtypes are both single flows which belong to the low Mg and high-Mg chemical types, respectively. These subdivisions are all distinguished on a plot of MgO versus TiO/sub 2/ and/or MgO versus P/sub 2/O/sub 5/, but other major and minor elements, as well as trace elements, also reflect consistent chemical differences between the chemical types. Identification of these chemical types in the Pasco Basin subsurface shows that the high-Mg and low-Mg chemical types are ubiquitous, but the low-K chemical type is limited to the central, southern, and eastern parts of the basin. The Umtanum chemical subtype is present throughout the Pasco Basin subsurface, although it thins in the northeastern part of the basin and is apparently absent from surface exposures 40 kilometers (25 miles) north of the basin. The McCoy Canyon chemical subtype is also present throughout the basin.

• Research Organization: Rockwell International Corp., Richland, WA (USA). Rockwell Hanford Operations
• DOE Contract Number: EY-77-C-06-1030
• OSTI ID: 5431481
• Report Number(s): RHO-BWI-SA-32; CONF-800342-2
• Country of Publication: United States
• Language: English

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RADIOACTIVE WASTE DISPOSAL
ROCKS
STRATIGRAPHY
SURVEYS
TABLES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
UNDERGROUND DISPOSAL
US DOE
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