Table
T6. Instrument conditions during Leg 183 XRF analyses.
Notes: Total Fe as Fe2O3*; FPC = flow proportional
counter using P10 gas; Scint = NaI scintillation counter. Trace elements
analyzed under vacuum using goniometer 2 at generator settings of 60 kV and 50
mA; major elements analyzed under vacuum using goniometer 2 (1 for Na and Mg) at
generator settings of 30 kV and 80 mA.
Element
Line
Crystal
Detector
Collimator
Peak
angle
(o2
)Background
offset
(o2)Total
peak
(s)Count
time
background
(s)
SiO2
K
PET(002)
FPC
Coarse
109.21
0
40
0
TiO2
K
LiF(200)
FPC
Fine
86.11
0
40
0
Al2O3
K
PET(002)
FPC
Coarse
145.18
0
100
0
Fe2O3*
K
LiF(200)
FPC
Fine
57.47
0
40
0
MnO
K
LiF(200)
FPC
Fine
62.93
0
100
0
MgO
K
TLAP
FPC
Coarse
45.17
±0.80
150
300
CaO
K
LiF(200)
FPC
Coarse
113.12
0
40
0
Na2O
K
TLAP
FPC
Coarse
55.1
-1.2
150
150
K2O
K
LiF(200)
FPC
Coarse
136.69
0
100
0
P2O5
K
Ge(111)
FPC
Coarse
141.09
0
100
0
Nb
K
LiF(200)
Scint
Fine
21.4
0.35
100
100
Zr
K
LiF(200)
Scint
Fine
22.55
-0.35
100
100
Y
K
LiF(200)
Scint
Fine
23.8
-0.4
100
100
Sr
K
LiF(200)
Scint
Fine
25.15
-0.4
100
100
Rb
K
LiF(200)
Scint
Fine
26.62
-0.6
100
100
Zn
K
LiF(200)
Scint
Fine
41.81
-0.55
100
100
Cu
K
LiF(200)
Scint
Fine
45.03
-0.4
100
100
Ni
K
LiF(200)
Scint
Fine
48.67
-0.55
100
100
Cr
K
LiF(200)
FPC
Fine
69.35
-0.5
100
100
TiO2
K
LiF(200)
FPC
Fine
86.11
0.5
40
40
V
K
LiF(220)
FPC
Fine
123.06
-0.5
100
100
Ce
L
LiF(220)
FPC
Medium
128.13
-1.5
100
100
Ba
L
LiF(220)
FPC
Medium
128.78
-1.5
100
100