Table 2.
Mineral and petrographic characteristics of underlying rocks [41].
| No. | Description | Mineral Composition | Assumed Deposit (Geological Age) |
Samples of Biodeposits (Table 1) |
|---|---|---|---|---|
| Marbles | ||||
| 1 | White homogeneous, fine to medium grained marble (statuary marble) |
Calcite, quartz | Carrara, Italy (Cretaceous) |
M1v, M1s |
| 2 | Grey-white banded, heterogeneous, heterogranular carbonate-silicate rock (Ruskeala marble) |
Calcite, dolomite, amphiboles (tremolite, hornblende), talc, Fe, Mg—micas, pyroxenes (diopside etc), quartz, apatite |
Ruskeala, Karelia, Sortovala region, Russia (Early Proterozoic) |
M2v, M2s |
| Limestones | ||||
| 3 | Grey, porous travertine (Pudostskii stone) | Calcite, dolomite, quartz |
Pudostskoe, Leningrad region, Russia (Quaternary) |
L1, M9v, M9s |
| 4 | Grey-yellow, stratified Limestone (Putilovskaya plita) |
Dolomite, calcite, quartz, glauconite |
Putilovskoe, Leningrad region, Russia (Ordovician) |
M3v, M3s, M3v, M3s, M4v, M4s, M5v, M5s, M6v, M6s, M7v, M7s, M8v, M8s |
| Granites | ||||
| 5 | Gray, fairly homogeneous fine- and medium-grained rock (Serdobol granite) |
Feldspars (microcline, acidic plagioclase), quartz, mica (biotite), pyroxenes and amphiboles | Karelia Sortavala region, Russia (Early proterozoic) | A1, A2 |
| 6 | Pink coarse-grained porphyritic ovoid granite (Rapakivi granite) | Leningrad region, Karelia, Russia and Finland (Proterozoic) | M10v, M10s, M11v, M11s, M12v, M12s, M13v, M13s | |