Table
T7. Unit thicknesses and general characteristics and criteria
for defining unit boundaries, Site 1185.
Unit/Subunit
Thickness
(m)
Characteristics
Unit top
defined by
192-1185A:
1
9.91
Massive
with pillowed top and base
Not
recovered
2
3.97
Pillowed
Recrystallized
limestone containing altered glass clasts (6-cm piece)
3A,
3B
0.19
+ 0.16
Pillowed
Limestone
containing fresh glass (9-cm piece: Subunit 3A)
4A,
4B
0.04
+ 0.15
Pillowed
Limestone
next to altered glass (4-cm piece: Subunit 4A)
5A,
5B
0.18
+ >5.50
Pillowed
Limestone
and glass (18-cm interval: Subunit 5A)
192-1185B:
1
11.19
Pillowed
Not
recovered
2
15.56
Massive
with a minor pillowed top; carbonate-filled fractures present
Interval
dominated by hyaloclastite (47 cm)
3
1.00
Pillowed
Downward
change from massive unit to pillows with hyaloclastite
4
1.23
Pillowed
Hyaloclastite
(9-cm piece)
5
9.61
Massive
with pillowed top
Interval
dominated by basaltic breccia with glass clasts in a pink clay and white
carbonate matrix (70 cm)
6
1.20
Pillowed
Interval
dominated by hyaloclastite (65 cm)
7
19.00
Pillowed;
glassy rims and minor carbonate sediment present
Interval
of carbonate-cemented breccia with glass clasts (20 cm)
8
1.14
Pillowed
Interval
of carbonate-cemented basaltic breccia and hyaloclastite (15 cm)
9
65.16
Pillowed
Interval
of carbonate-cemented hyaloclastite (15 cm)
10
19.30
Massive;
carbonate-filled fractures
Altered,
coarse-grained yellow-brown basaltic breccia (22 cm)
11
28.10
Massive
Presence
of vesicles and greenish alteration combined with an abrupt increase in
drilling rate for 4 m with no recovery
12
>36.64*
Massive
Chilled
upper contact
Note: * = final core was not recovered because bottom-hole assembly broke (see "Operations").