Slika:North america and scandinavia basement rocks.png
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North_america_and_scandinavia_basement_rocks.png (484 × 429 točk, velikost datoteke: 15 KB, MIME-vrsta: image/png)
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| Opis | North American cratons and basement rocks. As radiometric ages were determined for the shield-like rocks on the continents which were either exposed at the surface, underlay the flat rocks, or were within the interior of the mountain belts, patterns of age intervals were determined. These old rocks have been called the "basement". This has been interpreted to mean that the continents had somehow grown by development of rock assemblages with these characteristic age parameters. The expanding continental nuclei are part of the "craton" which consist of both exposed and buried basement rocks. |
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Ta slika je digitalno obdelana. Opravljene so bile naslednje spremembe: Change of colours to match some geological map colour templates. Izvirnik je na voljo tukaj: North america basement rocks.png. Spremembe je opravil uporabnik Bjoertvedt.
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- File:North_america_basement_rocks.png licensed with PD-USGov-USGS
- 2005-09-16T15:47:59Z Saperaud 484x429 (13371 Bytes) [[North America]]n [[craton]]s and basement rocks. As radiometric ages were determined for the shield-like rocks on the continents which were either exposed at the surface, underlay the flat rocks, or were within the interio
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| Datum in čas | Sličica | Velikost | Uporabnik | Komentar | |
|---|---|---|---|---|---|
| trenutno | 23:34, 1. april 2011 | | 484 × 429 (15 KB) | Bjoertvedt | {{Information |Description=North American cratons and basement rocks. As radiometric ages were determined for the shield-like rocks on the continents which were either exposed at the surface, underlay the flat rocks, or were within the interior o |
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