- Tytuł:
-
W poszukiwaniu fragmentów najstarszej skorupy kontynentalnej na Labradorze
Searching for pieces of the oldest crust in Labrador - Autorzy:
-
Kusiak, M. A.
Sałacińska, A. - Powiązania:
- https://bibliotekanauki.pl/articles/2075545.pdf
- Data publikacji:
- 2016
- Wydawca:
- Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
- Tematy:
-
młoda Ziemia
blok Saglek
Labrador
granitoid
cyrkon
early Earth
Saglek Block
granitoids
zircon - Opis:
- There are few unresolved questions in the Earth Sciences which generate as much debate as the nature of the Hadean Earth: i.e. the rock record between the Earth’s formation and about 3.8 billion years ago. Current knowledge of the nature and origin of the earliest crust comes largely from studies of the mineral zircon (ZrSiO4). The oldest zircon grains on Earth (4.46 Ga) are found in Jack Hills, Australia. They represent a time capsule of what the Earth was like from ca. 4.4-4.0 Ga during the Hadean. The other ancien rocks (>3.8 Ga) are preserved in Antarctica, Canada, China, Greenland, Labrador, Western Australia and Swaziland, with the oldest known rochi on Earth from the Acasta gneiss in Northern Canada, dated at 4.03 Ga. Most likely, the second oldest rock record in the world (>3.9 Ga) may be derivedfrom the Nanok gneiss in the Nain Complex of the Saglek-Hebron area in the northern part of the Labrador Peninsula. Extensive investigation of these rocks will allowfurther characterizing the nature of the earliest preserved crust.
- Źródło:
-
Przegląd Geologiczny; 2016, 64, 11; 896--901
0033-2151 - Pojawia się w:
- Przegląd Geologiczny
- Dostawca treści:
- Biblioteka Nauki
Artykuł