|
|
Nature of contact/
Rationale for boundary
|
|
|
|
|
Core, section, piece, interval
|
|
|
|
|
|
|
|
|
|
|
|
|
309-1256D-
|
|
|
|
27
|
75R-1 (Piece 1, 0 cm)
|
752.0
|
Chilled margin
|
3.17
|
Aphyric cryptocrystalline to microcrystalline basaltic sheet flow
|
28
|
77R-1 (Piece 16, 66 cm)
|
759.4
|
Chilled margin
|
3.69
|
Sparsely to moderately phyric cryptocrystalline to fine-grained basaltic sheet flow
|
29a
|
78R-3 (Piece 2, 10 cm)
|
766.5
|
Breccia and chilled margin
|
3.53
|
Aphyric cryptocrystalline to microcrystalline basaltic sheet flow
|
29b
|
80R-1 (Piece 2, 3 cm)
|
779.2
|
Breccia and chilled margin
|
8.59
|
Aphyric cryptocrystalline to fine-grained basaltic sheet flow
|
30
|
84R-2 (Piece 10, 60 cm)
|
803.9
|
Textural change
|
3.16
|
Massive aphyric fine-grained basalt
|
31
|
85R-3 (Piece 3, 24 cm)
|
814.6
|
Chilled margin
|
11.27
|
Massive aphyric fine-grained basalt
|
32
|
88R-1 (Piece 9, 49 cm)
|
840.7
|
Textural change
|
0.93
|
Aphyric fine-grained sheet flow
|
33a
|
89R-1 (Piece 1, 0 cm)
|
849.8
|
Different style of eruption
|
9.19
|
Aphyric microcrystalline sheet flow
|
33b
|
99R-1(Piece 1, 0 cm)
|
907.4
|
Textural change (more massive and coarse grained)
|
2.45
|
Aphyric fine-grained basaltic sheet flow
|
34a
|
100R-1 (Piece 2, 6 cm)
|
910.7
|
Breccia (containing clasts with chilled margin)
|
2.72
|
Massive aphyric microcrystalline to fine-grained basalt
|
34b
|
101R-2 (Piece 7, 33 cm)
|
918.8
|
Rubble, change in fracturation and alteration features
|
2.49
|
Massive aphyric fine-grained basalt
|
35a
|
102R-3 (Piece 6, 24 cm)
|
929.8
|
Textural change
|
2.71
|
Aphyric cryptocrystalline to fine grained basaltic sheet flow
|
35b
|
106R-1 (Piece 16, 67 cm)
|
951.1
|
Phenocrysts (sparsely olivine-clinopyroxene-plagioclase phyric)
|
0.32
|
Sparsely phyric cryptocrystalline to microcrystalline sheet flow
|
35c
|
106R-1 (Piece 24, 108 cm)
|
951.5
|
Return to aphyric texture
|
2.14
|
Aphyric cryptocrystalline to microcrystalline basaltic sheet flow
|
36a
|
108R-2 (Piece 11, 61 cm)
|
960.9
|
Breccia, textural change
|
3.56
|
Massive aphyric microcrystalline basalt
|
36b
|
110R-1 (Piece 3, 26 cm)
|
969.9
|
Textural change
|
2.85
|
Massive aphyric microcrystalline basalt
|
36c
|
111R-1 (Piece 2, 25 cm)
|
974.7
|
Textural change
|
1.39
|
Massive aphyric microcrystalline basalt
|
37
|
112R-1 (Piece 10, 75 cm)
|
980.0
|
Textural change, phenocrysts (sparsely cpx-plag phyric)
|
0.89
|
Sparsely phyric cryptocrystalline to microcrystalline sheet flow
|
38
|
113R-1 (Piece 10, 38 cm)
|
984.4
|
Breccia (containing clasts with chilled margin)
|
2.15
|
Aphyric microcrystalline to fine-grained sheet flow
|
39a
|
114R-1 (Piece 12, 112 cm)
|
989.9
|
Moderate vesicular, breccia with cryptocrystalline clasts
|
0.81
|
Massive sparsely phyric moderately vesicular microcrystalline basalt
|
39b
|
114R-2 (Piece 10, 66 cm)
|
990.9
|
Textural change (disappearance of vesicles)
|
3.38
|
Massive aphyric microcrystalline basalt
|
40
|
117R-1 (Piece 6, 85 cm)
|
1004.1
|
Textural change, brecciation
|
1.67
|
Cataclastic-massive basaltic unit
|
41
|
118R-1 (Piece 8, 66 cm)
|
1008.7
|
Textural change
|
3.87
|
Aphyric microcrystalline basaltic sheet flow
|
42a
|
122R-1 (Piece 7, 25 cm)
|
1027.6
|
Textural change (volcanic breccia)
|
1.30
|
Mineralized volcanic breccia
|
42b
|
122R-2 (Piece 4, 30 cm)
|
1029.1
|
Volcanic breccia is interbedded with sheet flow
|
1.47
|
Mineralized volcanic breccia intercalated with aphyric cryptocrystalline basaltic sheet flow
|
43
|
123R-1 (Piece 24, 109 cm)
|
1033.2
|
Textural change
|
4.40
|
Aphyric microcrystalline basaltic sheet flow
|
44a
|
129R-1 (Piece 1, 0 cm)
|
1060.9
|
Textural change
|
1.96
|
Massive aphyric microcrystalline basalt
|
44b
|
130R-1 (Piece 1, 0 cm)
|
1065.7
|
Breccia, textural change
|
2.34
|
Massive aphyric microcrystalline basalt
|
44c
|
131R-1 (Piece 1, 0 cm)
|
1070.5
|
Textural change
|
4.41
|
Massive aphyric microcrystalline basalt
|
44d
|
133R-1 (Piece 5, 108 cm)
|
1081.2
|
Textural change
|
3.54
|
Massive aphyric microcrystalline basalt
|
45
|
135R-1 (Piece 10, 101 cm)
|
1090.7
|
Breccia
|
2.83
|
Massive aphyric microcrystalline basalt
|
46a
|
137R-1 (Piece 16, 105 cm)
|
1100.4
|
Textural change
|
2.24
|
Massive aphyric microcrystalline basalt
|
46b
|
139R-1 (Piece 2, 8 cm)
|
1109.0
|
Textural change and possible contact
|
1.63
|
Massive aphyric microcrystalline basalt
|
47
|
140R-1 (Piece 4, 19 cm)
|
1113.9
|
Complex brecciated intrusive contact
|
0.90
|
Intrusive contact breccia and aphyric fine-grained basalt
|
48
|
141R-1 (Piece 2, 9 cm)
|
1118.6
|
Brecciated chilled margin
|
3.59
|
Massive aphyric microcrystalline to fine-grained basalt
|
49
|
143R-1 (Piece 12, 56 cm)
|
1128.7
|
Breccia, dike contact
|
0.94
|
Aphyric microcrystalline basalt
|
50
|
143R-2 (Piece 6, 22 cm)
|
1129.8
|
Change of phenocryst content (olivine + clinopyroxene)
|
9.61
|
Massive sparsely phyric microcrystalline basalt
|
51
|
147R-1 (Piece 5, 19 cm)
|
1145.4
|
Textural change (more coarse grained)
|
0.97
|
Doleritic basalt
|
52a
|
148R-1 (Piece 1, 0 cm)
|
1151.1
|
Textural change
|
3.77
|
Massive aphyric microcrystalline basalt
|
52b
|
149R-1
|
|
Intrusive contact
|
|
Aphyric cryptocrystalline basalt
|
52c
|
151R-1
|
|
Intrusive contact
|
|
Aphyric cryptocrystalline basalt
|
53a
|
152R-1 (Piece 1, 0 cm)
|
1169.9
|
Textural change
|
3.00
|
Massive aphyric fine-grained basalt
|
53b
|
153R-2
|
|
Intrusive contact
|
|
Aphyric cryptocrystalline basalt
|
54
|
154R-1 (Piece 1, 0 cm)
|
1179.6
|
Textural change
|
4.68
|
Massive aphyric microcrystalline basalt
|
55a
|
156R-1 (Piece 1, 0 cm)
|
1189.4
|
Textural change
|
6.06
|
Massive aphyric microcrystalline basalt
|
55b
|
157R-1
|
|
Intrusive contact
|
|
Aphyric microcrystalline basalt
|
56a
|
159R-1 (Piece 16, 93 cm)
|
1204.7
|
Textural change
|
3.94
|
Massive aphyric cryptocrystalline to microcrystalline basalt
|
56b
|
161R-1
|
|
Intrusive contact
|
|
Aphyric cryptocrystalline basalt
|
57a
|
162R-1 (Piece 9, 65 cm)
|
1214.1
|
Textural change
|
4.93
|
Massive aphyric cryptocrystalline-microcrystalline basalt
|
57b
|
162R-3
|
1216.4
|
Intrusive contact
|
|
Aphyric cryptocrystalline basalt
|
57c
|
163R-2
|
1219.5
|
Textural change and intrusive contact
|
|
Aphyric cryptocrystalline basalt
|
58
|
163R-3 (Piece 1, 0 cm)
|
1221.0
|
Textural change
|
2.83
|
Massive aphyric cryptocrystalline to microcrystalline basalt
|
59
|
164R-2 (Piece 9, 45 cm)
|
1225.0
|
Textural change
|
0.98
|
Massive aphyric microcrystalline basalt
|
60a
|
164R-3 (Piece 3, 16 cm)
|
1226.2
|
Textural change
|
3.69
|
Massive aphyric microcrystalline basalt
|
60b
|
165R-3
|
|
Intrusive contact
|
|
Aphyric cryptocrystalline dike
|
61a
|
166R-1 (Piece 1, 0 cm)
|
1232.6
|
Textural change
|
3.56
|
Massive aphyric microcrystalline basalt
|
61b
|
166R-1
|
|
Intrusive contact
|
|
Aphyric cryptocrystalline dike
|
62
|
167R-1 (Piece 1, 0 cm)
|
1236.4
|
Textural change
|
3.01
|
Massive aphyric-sparsely phyric microcrystalline basalt
|
63
|
167R-3 (Piece 11, 73 cm)
|
1239.8
|
Breccia, textural change
|
6.37
|
Massive aphyric microcrystalline basalt
|
64
|
169R-1 (Piece 9, 60 cm)
|
1247.6
|
Textural change
|
4.32
|
Massive aphyric microcrystalline basalt
|
65
|
170R-2 (Piece 12, 104 cm)
|
1254.2
|
Textural change
|
1.15
|
Massive aphyric microcrystalline basalt
|
|
|
|
|
|
|
|
|
|