hki
Í
» 1i 1
I t
i’
JGi
r i
' ML.
378
No. 16.
57° 47' AV. Depth, 3,000 fathoms.
Chemical composition
Loss on ignition afte r drying at 230“ F.
-Station 19. March 11th. Lat. 19° 15' N. ; Long.
Bottom temperature, l°-3 C.
Portion soluble in
bj'drochloric acid
= 56-47.
Portion insoluble
in hydrochloric
acid = 36-09.
......................................... 7-44
Alumina . . . . ' .................................................12-91
Ferric oxide . 10-33
Calcium p h o s p h a te ................................................... Traces.
Calcium su lp h a te ..................................................... 0-96
Calcium c a r b o n a t e ............................................... 1-49
Magnesium c a r b o n a te .......................................... 3-10
S i l i c a ...............................................................................27-68
A l u m i n a ................................................................. 7-81
Fen-ic o x i d e ........................................................... 1'57
Lime................................................. 1-03
M a g n e s i a ................................................................ q-52
S i l i c a ..............................................................................25-16
100-00
A ‘ red-clay ’ containing amorphous clayey matter with oxide
of iron. Small crystals of sanidine, mica, angite.
A few siliceous spicules. Only a single fragment of GloUgerina
shell was observed.
No. 17.— Station 20. March 12. Lat. 18° 56' N .; Long.
59° 35 W. Depth, 2,975 fathoms. Bottom temperature,
1°’6 C. Chemical composition :—
Loss on ignition afte r washing and drying at 230“ F .......................... 7-45
A l u m i n a ................................................................ 12-28
Ferric o x i d e ...........................................................11 -44
Portion soluble in Calcium p h o s p h a te ...................................Small trace.
hydrochloric acid <
= 66-83.
Portion insoluble
in hydrochloric
acid = 35-72.
Calcium sulphate
Calcium carbonate .
Magnesium carbonate
S i l i c a ........................
Alumina . . . .
Ferric oxide .
L i m e ........................
Magnesia . . . .
.............................. 1-47
.............................. 3-50
............................. 2-14
. . : . . . 26-00
............................. 7-28
............................. 2-36
1-18
............................. 0-50
S i l i c a ..............................................................................24-40
100-00
A ‘ red clay ’ containing amorphous clayey matter with oxide
of iron; small particles of hornblende, augite, magnetite, sanidine,
and quartz, and a few grains of peroxide of manganese.
A few siliceous spicules. Only two fragments of Gloligmna
shell occurred in the portion of the sample examined.
No. 18.—Station 21. March 13. Lat. 18° 54' N. ; Long.
61° 28' W. Depth, 3,025 fathoms. Bottom temperature,
l°-3 C- Chemical composition:—
Loss on ignition after drying a t 230° F .................................................... 5'92
A l u m i n a ...................................................................... 7 LA
Ferric o x i d e ...................................................................12-25
Calcium p h o s p h a te .........................................Small traces.
Calcium s u l p h a t e ............................................... O'^l
Calcium c a r b o n a t e ............................................... 2-44
Magnesium c a r b o n a te .......................................... 3.48
S i l i c a ..............................................................................24-70
A l u m i n a ...................................................................... ^ -51
Ferric o x i d e ....................................................... ■ 6'73
L i m e ....................................................................... 0-81
M a g n e s ia ................................................................. 0-41
S i l i c a .......................................................................30'20
Portion soluble in
hydrochloric acid ^
= 50-42.
Portion insoluble
in hydrochloric
acid = 43-66.
100-00
A ‘ red clay ’ containing- much amorphous clayey matter -with
iron peroxide; many fragments of sanidine, augite, olivine,
hornblende, and magnetite; many of the mineral particles mnch
larger than those at Station 20.
A few fragments of the tests of Globigerina.
No. 19.— Station 22. March 14.—Lat. 18° 40' N .; Long.
62° 56' W.
Depth, 1,420 fathoms.
Bottom temperature.
3°-0 0.
Chemical composition :—
Loss on ignition afte r drying a t 230° F.
Alumina . . .
Ferric oxide .
Calcium phosphate
Calcium su lp h a te.
Calcium carbonate
Portion soluble in
liydrochloric acid
= 92-75.
Magnesium carbonate
S i l i c a ........................
Portion insoluble
in hydrochloric
acid = 3-45.
Insoluble residue, principally alumina and
ferric oxide, with s i l i c a ...................................
3-80
4-42
2-41
0-41
80-69
0-68
4-14
3-45
100-00