Table T4. Igneous core description log, Hole 801C.
Core, section |
Piece | Analysis* | Depth (mbsf) | Interval (cm) |
Length (cm) | Unit, subunit |
Lithology | Texture | Structure | Color | Comments | Chilled margin present | |||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Top | Bottom | Interval | Unit | Subunit | Top | Base | |||||||||||||
129-801C- |
|
|
|
|
|
|
|||||||||||||
1R-1 | 1A-2G |
3
|
493.70 | 494.94 | 0-124 | 124 | 361 |
—
|
1
|
Alkali aphyric microdolerite, sparsely plagioclase phyric basalt | Medium to fine grained |
Sill
|
White, speckled gray to black | Massive unit no contacts, sparse plagioclase phenocrysts, no vesicles |
N
|
Y
|
|||
1R-2 | 1A - 3F |
1
|
494.94 | 496.30 | 0-136 | 136 | 361 |
—
|
1
|
Same as above | Same as above | Same as above |
—
|
N
|
Y
|
||||
1R-3 | 1A -1G |
1
|
496.30 | 497.31 | 0-101 | 101 | 361 |
—
|
1
|
Same as above | Same as above | Same as above |
—
|
N
|
Y
|
||||
1R-3 | 2 |
1
|
497.31 | 497.40 | 101-110 | 9 | 398 |
—
|
2
|
Sparsely plagioclase, olivine microphyric, aphyric basalt | Fine to medium grained, massive |
Sill
|
Brown/gray to speckled gray | Diffuse contacts, grain size changes, mineral accumulation |
N
|
Y
|
|||
1R-4 | 1-2D |
1
|
497.40 | 498.55 | 0-115 | 115 | 398 |
—
|
2
|
Same as above | Same as above | Same as above |
—
|
N
|
Y
|
||||
1R-5 | 1A-4B |
2
|
498.55 | 499.97 | 0-142 | 142 | 398 |
—
|
2
|
Same as above | Same as above | Same as above |
—
|
N
|
Y
|
||||
1R-6 | 1-5 |
1
|
499.97 | 501.29 | 0-132 | 132 | 398 |
—
|
2
|
Same as above | Same as above | Same as above |
—
|
N
|
Y
|
||||
2R-1 | 1A-1F |
2
|
503.00 | 504.38 | 0-138 | 138 | 344 |
—
|
3
|
Sparsely plagioclase phyric to aphyric alkali basalt | Fine to glassy, massive |
Sill
|
Gray brown to speckled gray | Diffuse contacts, devitrified glassy rim, grain size coarsening downward |
Y
|
N
|
Notes: * = XRF analysis from Castillo et al. (1992), includes number of analyses per section; — = no data, Y = yes, N = no, XRF = X- ray fluorescence, PP = physical properties, TSB = thin- section billet, *2 = two samples. Cores 129- 801C- 1R to 12R were described in the "Site 801" chapter of the Leg 129 Initial Reports volume (Shipboard Scientific Party, 1990) and modified for consistency downhole during Leg 185 to include some subunits within the existing units. Cores 185- 801C- 13R to 52M are described in this chapter. Only a portion of this table appears here. The complete table is available in ASCII format.