Igneous refinement of quartz raw materials
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Igneous refinement of quartz raw materialsRune B. LarsenFrancois JacamonBjorn Eske SorensenNorwegian University of Science and Technology
Peter M. IhlenAxel MüllerGeological Survey of Norway
GSA, Salt Lake City, 2005
• High purity quartz• High end products • Silica glasses• Optical lenses, light bulbs• Fibres, insulators
• Polycrystalline silica• Solar grade silica (?)
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Trace elements in qz, which, where and why ?
Typical abundance in igneous quartz
Analytical approach
Melt composition, igneous evolution qz-comp.
Subsolidus modification
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LA-ICP-MS is the preferred analytical method
Al: <10 – 1000
Ti: <1 – 200
Li: <1 – 30
P: <1 – 30
K: <5 – 20(?)
Fe: <1 – 20
B: <1 – 10(?)
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I-type Metaluminous Granites and GP’s
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Charnockitic pyroxene-granite
Hornblende granite
Pyroxene-hornblende granite
Hornblende-biotite granite
Biotite granite
High T
Low T
A-TYPE GRANITIC ROCKS - CHARNOCKITES
Pedersen, 1988
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Quartz TE abundance
(Ge/Ti) rock evolution
0.01
conc
entra
tion
( m
ol/m
ol S
iO2)
0.1
1
10
100
1000
0.05
Ti
Li
P
Ge
Be
Al
Pyr- Bi-graniteHbl-
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Pyr-granite
Hbl-Bi granite 1
Hbl-granite1
Bi-granite 1
Pyr-Hbl granite
Hbl-granite 2
Hbl-Bi granite 2
Bi-granite 2
0.00
5.00
10.00
15.00
20.00
25.00
30.00
0.000 0.020 0.040 0.060 0.080 0.100
Ge/Ti
Li (p
pm)
Lithium
0.00
50.00
100.00
150.00
200.00
250.00
300.00
0.000 0.020 0.040 0.060 0.080 0.100
Ge/Ti
Al (
ppm
)
Aluminium
Aluminium and lithium behaviour
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PHOSPHORUS
Pyr-granite
Hbl-Bi granite 1
Hbl-granite1
Bi-granite 1
Pyr-Hbl granite
Hbl-granite 2
Hbl-Bi granite 2
Bi-granite 2
0.00
5.00
10.00
15.00
20.00
25.00
0.000 0.020 0.040 0.060 0.080 0.100
Ge/Ti
Apatite out?
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S-TYPE PERALUMINOUS GRANITES
Müller et al., 2002Podlesi, Czech Republi
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Müller et al., 2002
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Primary Qz
Early Secondary Qz
Late Secondary Qz
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Igneous differentiation form quartz with low Ti, Fe, K and B contents. Ge and Li is increasing. P and Al may also increase
Peraluminous granites, form qz with high Al contents. Evolved metaluminous granitic qz is low in this element
Largely, the quartz composition is buffered by the melt composition
Li, B, Al and Fe is lowered during hydrothermal recrystallization
K is not seriously influenced. The Na concentration may increase markedly
Ti, Ge and P are normally immobile during recrystallization
Qz is quite robust during subsolidus weathering and may largely preserve igneous fingerprint
Accordingly, qz partially preserve the igneous history and distinguish magmatic events in igneous complex terrains
Granitic pegmatite, particularly metaluminous and hydrothermally infiltrated GP’s are promising targets for HPQ prospecting
GSA, Salt Lake City, 2005, Rune B. larsen