Investor Presentaiton
Features of volcanic rocks
The distribution of rare-earth elements, HFSE (high field strength elements) and LILE (lithophilic
elements) in volcanic rocks are typical of MORB, boninites, island-arc volcanics and OIB basalts.
Discrimination diagramm of Th-Hf/3-Ta
E-MORB
• Picrobasalt
Boninite
•Andesibasalt
CAB (calc-alkiline basalt)
• Andesites
OIB (alkiline oceanic within-plate basalts)
•Trachyandesite
Discrimination diagrams of Nb/Y and Zr/Ti for volcanic rocks
and apogabbros of the Ulan-Sar'dag massive
Zr/Ti
10
0,1
0,01
Th
Volcanic Are& Island Are Tholeiites
Hf/3
Picrobasaltes, basaltes
11
13
12
* 14
Andesite-basaltes, andesites
10
☐
7
A
Dacites, rhyolites
N-MORB
A
E-MORB
Alkali Basalt
• 9
Trachyandesites, alkali basaltes
15
16
Metaperidotites, metagabbro
°
1
0
5
4
° 6
A 3
ㅁ
2
Discrimination diagramm of Th√-NbN
alkali-rhyolite
phonolite
100.00
trachyte
dacite+rhyolite
▲ 12
trachy-
andesite
* 14
andesite+basaltic andesite
8
☐
Δ 10
☐
foidite
alkali
basalts
basalts
16
12272×TONOU a
9
11
13
10.00
VOLCANIC ARC ARRAY
BABB
20
ThN
A 15
1,00
Fincreasing
subduction
components
PM
IAT&Bonimite
1E-3
0,01
0,1
Nb/Y
1
10
0,10
no
subduction
components
CAB
MORB-normalized diagrams distribution of HFSE in vulcanites and
peridotites of Ulan-Sar'dag massif
100
10
1
Peridotites, gabbro
100
10
1
Gabbro, metagabbro
0,1
0,1
0
8
Th Nb Ta La Ce Nd Zr Sm Ti Gd Tb Dy Y Er Yb
2
3 <―4
Th Nb Ta La Ce Nd Zr Sm Ti Gd Tb Dy Y Er Yb
56
17
100
10
0,1
Ta
1000
N-MORB
E-MORE
-MORB
AB
0,01
L
0,01
0,10
MORB OIB ARRAY
→SSZ-E
→ AFC
OIB-CE
FC
1000
100
Increasing
partial melting
degree
10
0.1
1,00
10,00
100,00
NbN
1
100
10
0,1
1000
100
0.1
10
100
Boninite
10
7
N-MORB
1000
Andesites, dacites
9
8
N-MORB
10
100
Picrobasaltes, basalts
Cs Rb Ba U Th Ta Nb La Ce Sr Pr Nd Zr Hf Sm Eu Gd Ti Tb Dy Ho Y Er Tm Yb
11
14
12
N-MORB
E-MORB
Basalt, trahyandesites
Cs Rb Ba U Th Ta Nb La Ce Sr Pr Nd Zr Hf Sm Eu Gd Ti Tb Dy Ho Y
ОІВ
16
17
15
13
10
1000
100
10
100
10
Boninite
La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
N-MORB 17
Andesites, dacites
1
8
La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
UCC
10.
Picrobasaltes, basalts
La Ce Pr Nd Sm Eu Gd ть
Dy Ho Er Tm Yb Lu
11 14 12 13
E-MORB
Basalt, trahyandesites
Er Tm Yb
1
La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er
Tm Yb Lu
N-MORB
OIB
17
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