|
| Number | Formations and complexes of rocks* | Age*
106 years | Petrographic varieties | Mineralogical composition | Accessories minerals |
|
| 1 | Charnockites and granites formation | Lower Proterozoic
(2000–2200) | Alaskite | Quartz (20–40%)
Microcline (35–70%)
Plagioclase—Pl20–25 (5–35%)
Biotite (0–5%) | Zircon (5–200 g/t)
Monazite (30–250 g/t)
Magnetite (9–4009 g/t)
Apatite (~14 g/t)
Garnet (7–17 g/t) |
| 2 | Leucogranite | Quartz (20–35%)
Microcline (5–35%)
Plagioclase—Pl20–25 (30–35%) | Magnetite (~20 g/t)
Zircon (656 g/t)
Monazite (1270 g/t)
Apatite (~20 g/t) |
|
| 3 | Plagiogranites and tonalities formation | Upper Archean–Lower Proterozoic
(2550–2800) | Plagiomigmatite | Quartz (20–30%)
Plagioclase—Pl25–30 (60–80%)
Biotite (<10%)
Microcline (<5%) | Apatite ~
Monazite (12–211 g/t)
Zircon (12–190 g/t)
Garnet (23–183 g/t) |
| 4 | Plagiogranite | Quartz (20–50%)
Plagioclase—Pl25–30 (35–70%)
Pyroxene (5–15%)
Biotite ~
Microcline ~ | Apatite (10–40 g/t)
Zircon (~10 g/t)
Monazite ~
Magnetite (200 g/t)
Ilmenite (1430 g/t) |
|
| 5 | Enderbites formation | Upper Archean (2850–3150) | Enderbite | Quartz (20–30%)
Plagioclase—Pl25 (50–80%)
Pyroxene monoclinic (5–15%)
Hypersthene (5–20%)
Biotite (<5%)
Microcline ~ | Apatite
(228–1080 g/t)
Zircon (20–30 g/t)
Monazite ~
Ilmenite (~658 g/t)
Magnetite
(3317–7550 g/t) |
|
| 6 | The complex of metamorphic rocks | Lower Archean
(3300–3750) | Biotite-pyroxene Plagiogneiss | Quartz (10–30%)
Plagioclase—Pl30 (40–60%)
Pyroxene monoclinic (5-4%)
Hypersthene (<10%)
Biotite (10–15%)
Microcline (<10%) | Apatite
(17–680 g/t)
Zircon (8–60) g/t
Ilmenite (~1000 g/t)
Magnetite
(24–1348 g/t) |
| 7 | Biotite-amphibole-pyroxene-plagioclase with magnetite crystalline schist | Plagioclase—Pl30 (10–70%)
Pyroxene monoclinic (~15%)
Hornblende (~25%)
Biotite (~20%)
Quartz (<5%) | Magnetite (5–10 g/t)
Apatite (~170 g/t)
Zircon (~200 g/t) |
|
