Table T10 (continued).
Curatorial data | Breccia | Phenocrysts | Comments | |||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ig. Unit | Core | Section | Piece | Length (cm) | Sub | Depth (mbsf) | Red/brown clay | Green clay | Siderite | Am silica | Fe-oxides | Sediment | Calcite | Primary mineral | Proportion (%) | Secondary mineral | ||||
14 | 67 | 1 | 1 | 17 | 633.10 | 64 | 1 | Brecciated flow top. Slicks everywhere on all coherent clasts. Matrix (65%) is clasts + black/green clay (98%) and carbonate (2%). Clasts altered to dark brown clay. | ||||||||||||
2 | 13 | 633.27 | ||||||||||||||||||
3 | 33 | 633.40 | ||||||||||||||||||
14 | 67 | 2 | 1 | 139 | 633.73 | 64 | 1 | Same as above, with some blue clay. | ||||||||||||
14 | 67 | 3 | 1 | 150 | 635.12 | 10 | 3 | 1 | Breccia, clasts altered to clay. Lots of slicks. | |||||||||||
14 | 67 | 4 | 1 | 90 | 636.62 | 5 | 1 | 0-68 cm: flow top breccia, 5% zeolite, 1% carbonate, remainder clasts + clay. | ||||||||||||
30 | 10 | 68-104 cm: tectonic breccia, highly angular clasts, sheared green clay and ground up clasts (30%), carbonate (10%), rest is clasts. | ||||||||||||||||||
2 | 46 | 637.52 | 104-141: coherent flow interior. Mesostasis altered to siderite (90%) and carbonate (10%). Some resorbed clasts. | |||||||||||||||||
14 | 67 | 5 | 1 | 24 | 637.98 | Massive flow interior. | ||||||||||||||
2 | 2 | 638.22 | ||||||||||||||||||
3 | 27 | 638.24 | ||||||||||||||||||
4 | 13 | 638.51 | ||||||||||||||||||
5 | 7 | 638.64 | ||||||||||||||||||
6 | 13 | 638.71 | ||||||||||||||||||
7 | 7 | 638.84 | ||||||||||||||||||
8 | 4 | 638.91 | ||||||||||||||||||
9 | 5 | 638.95 | ||||||||||||||||||
10 | 8 | 639.00 | ||||||||||||||||||
11 | 7 | 639.08 | ||||||||||||||||||
12 | 11 | 639.15 | ||||||||||||||||||
13 | 2 | 639.26 | ||||||||||||||||||
14 | 68 | 1 | 1 | 101 | 642.60 | 97 | 1 | 2 | Volcanic + tectonic breccia. 50% clasts altered to clay. 50% matrix. For interval: 2% carbonate, 0.1% siderite, rest = clast and clay. Clay rich zones are highly sheared and polished. Clasts from red alteration zone below in this interval. | |||||||||||
15 | 2 | 24 | 643.61 | Clast and matrix altered to clay. Green slicks noted. | ||||||||||||||||
3 | 14 | 643.85 | Clast and matrix altered to clay. Green slicks noted. | |||||||||||||||||
15 | 68 | 2 | 1 | 150 | 643.99 | 19 | 0 | 0 | 0 | Breccia. 20% matrix = 95% green clay, 2% carbonate, 2% siderite, 1% am si, all recalculated for total section percent. Locally silicified. Some slicks in matrix rich areas. Some tectonic brecciation. Not all primary igneous brecciation. | ||||||||||
15 | 68 | 3 | 1 | 126 | 645.49 | 2 | 5 | 7 | 0-40 cm: Tectonic breccia. Numerous hydrothermal carbonate veins. Angular clasts (bottom most clast highly sheared). Clasts broken and rotated. Matrix + vesicles = 7% carbonate, 5% siderite, 2% clay. | |||||||||||
10 | 40-66 cm: Highly altered and sheared glassy volcanic breccia. Clasts = 30%, matrix = 70% (altered to clay). Total interval = 10% siderite. Slicks noted. | |||||||||||||||||||
66-126: Brecciated in places (down to 98 cm) where there is a sharp contact with vesicular basalt below. Breccias = 20% of interval and are composed of matrix (20%) and clast (80%). | ||||||||||||||||||||
15 | 68 | 4 | 1 | 145 | 646.75 | Oxidized patches = 30% of rock. Resorbed vesicular clast from 82-100 cm. | ||||||||||||||
16 | 98 | 2 | This breccia begins at 100 cm in section. Breccia is green and brown clays. 70% matrix yields 2% siderite in interval with the rest = clay. 30% clasts altered to clay. Some slicks. | |||||||||||||||||
Volcanic breccia. 60% clasts 40% matrix. In section: 0.5% siderite and 0.1% carbonate, rest = clay + clasts. Clasts are highly oxidized to brick red from 0-43 cm. Rare slicks. Magmatic flow textures in some clasts. | ||||||||||||||||||||
16 | 68 | 5 | 1 | 17 | 646.75 | 1 | 0 |