craton
the stable interior portion of a continent characteristically composed of ancient crystalline basement rock. The term craton is used to distinguish such regions from mobile geosynclinal troughs, which are linear belts of sediment accumulations subject to subsidence (i.e., downwarping). The extensive central cratons of continents may consist of both shields and platforms. A shield is that part of a craton in which (usually) Precambrian basement rocks crop out extensively at the surface. By contrast, in a platform the basement is overlain by horizontal or subhorizontal sediments.
[Britannica]
κράτον, το ή κρατονική μάζα, η (craton) (Γεωλ.) σταθερό, σχετικά, τμήμα του στερεού φλοιού τής Γης, που βρίσκεται συνήθως στο εσωτερικό τών ηπείρων. Ο όρος κράτον χρησιμοποιείται για να διαχωριστούν αυτές οι σταθερές περιοχές από τις ασταθείς γεωσυγκλινικές αύλακες, οι οποίες είναι επιμήκεις ζώνες καταβύθισης ή ανύψωσης τού στερεού φλοιού. Οι κρατονικές μάζες, σύμφωνα με τον ορισμό τους, είναι ουσιαστικά συνώνυμες με τις περιοχές τών ασπίδων. με τη διαφορά ότι οι ηπειρωτικές ασπίδες αποτελούνται από πετρώματα τού Προκαμβρίου (παλαιότερα από 570 εκατομμύρια χρόνια), ενώ τα κράτον είναι σταθερές περιοχές με πετρώματα οποιασδήποτε γεωλογικής ηλικίας.
[Πάπυρος]
A craton /ˈkreɪtən/ (Greek: κράτος kratos "strength") is an old and stable part of the continental lithosphere. Having often survived cycles of merging and rifting of continents, cratons are generally found in the interiors of tectonic plates. They are characteristically composed of ancient crystalline basement rock, which may be covered by younger sedimentary rock. They have a thick crust and deep lithospheric roots that extend as much as several hundred kilometres into the Earth's mantle.
The term craton is used to distinguish the stable portion of the continental crust from regions that are more geologically active and unstable. Cratons can be described as shields, in which the basement rock crops out at the surface, and platforms, in which the basement is overlaid by sediments and sedimentary rock.
The word craton was first proposed by the German geologist L. Kober in 1921 as Kratogen, referring to stable continental platforms, and orogen as a term for mountain or orogenic belts. Later authors shortened the former term to kraton and then to craton. The correct pronunciation is as it would sound if the spelling were cray-ton. The incorrect form, as if the spelling were cratton, is mistakenly used forgetful of its Greek origins and lack of a double t. Professor Iain Stewart used the form cratton in error during his presentation of the BBC series Rise of the Continents.
Examples of cratons are the Slave Craton in Canada, the Wyoming Craton in the United States, the Amazonia Craton in South America, the Kaapvaal Craton in South Africa, and the Gawler Craton in South Australia.
http://en.wikipedia.org/wiki/Craton
Γκουγκλιές: κρατονική μάζα
Το πρώτο γεωλογικό κράτον είναι στον τίτλο μας.
Σε ιστοσελίδα γεωλογίας βρίσκω τις λέξεις-κλειδιά κρατογενές και ορογενές.
Σημειωτέον ότι:
κρατογενής, -ές (Α)· (για την Αθηνά) αυτή που γεννήθηκε από το κεφάλι τού Διός.
[ΕΤΥΜΟΛ. < κράς, κρατός (ὁ/ἡ), «κεφάλι» + -γενής (< γένος), πρβλ. θεο-γενής, νυμφο-γενής].
the stable interior portion of a continent characteristically composed of ancient crystalline basement rock. The term craton is used to distinguish such regions from mobile geosynclinal troughs, which are linear belts of sediment accumulations subject to subsidence (i.e., downwarping). The extensive central cratons of continents may consist of both shields and platforms. A shield is that part of a craton in which (usually) Precambrian basement rocks crop out extensively at the surface. By contrast, in a platform the basement is overlain by horizontal or subhorizontal sediments.
[Britannica]
κράτον, το ή κρατονική μάζα, η (craton) (Γεωλ.) σταθερό, σχετικά, τμήμα του στερεού φλοιού τής Γης, που βρίσκεται συνήθως στο εσωτερικό τών ηπείρων. Ο όρος κράτον χρησιμοποιείται για να διαχωριστούν αυτές οι σταθερές περιοχές από τις ασταθείς γεωσυγκλινικές αύλακες, οι οποίες είναι επιμήκεις ζώνες καταβύθισης ή ανύψωσης τού στερεού φλοιού. Οι κρατονικές μάζες, σύμφωνα με τον ορισμό τους, είναι ουσιαστικά συνώνυμες με τις περιοχές τών ασπίδων. με τη διαφορά ότι οι ηπειρωτικές ασπίδες αποτελούνται από πετρώματα τού Προκαμβρίου (παλαιότερα από 570 εκατομμύρια χρόνια), ενώ τα κράτον είναι σταθερές περιοχές με πετρώματα οποιασδήποτε γεωλογικής ηλικίας.
[Πάπυρος]
A craton /ˈkreɪtən/ (Greek: κράτος kratos "strength") is an old and stable part of the continental lithosphere. Having often survived cycles of merging and rifting of continents, cratons are generally found in the interiors of tectonic plates. They are characteristically composed of ancient crystalline basement rock, which may be covered by younger sedimentary rock. They have a thick crust and deep lithospheric roots that extend as much as several hundred kilometres into the Earth's mantle.
The term craton is used to distinguish the stable portion of the continental crust from regions that are more geologically active and unstable. Cratons can be described as shields, in which the basement rock crops out at the surface, and platforms, in which the basement is overlaid by sediments and sedimentary rock.
The word craton was first proposed by the German geologist L. Kober in 1921 as Kratogen, referring to stable continental platforms, and orogen as a term for mountain or orogenic belts. Later authors shortened the former term to kraton and then to craton. The correct pronunciation is as it would sound if the spelling were cray-ton. The incorrect form, as if the spelling were cratton, is mistakenly used forgetful of its Greek origins and lack of a double t. Professor Iain Stewart used the form cratton in error during his presentation of the BBC series Rise of the Continents.
Examples of cratons are the Slave Craton in Canada, the Wyoming Craton in the United States, the Amazonia Craton in South America, the Kaapvaal Craton in South Africa, and the Gawler Craton in South Australia.
http://en.wikipedia.org/wiki/Craton
Γκουγκλιές: κρατονική μάζα
Το πρώτο γεωλογικό κράτον είναι στον τίτλο μας.
Σε ιστοσελίδα γεωλογίας βρίσκω τις λέξεις-κλειδιά κρατογενές και ορογενές.
Σημειωτέον ότι:
κρατογενής, -ές (Α)· (για την Αθηνά) αυτή που γεννήθηκε από το κεφάλι τού Διός.
[ΕΤΥΜΟΛ. < κράς, κρατός (ὁ/ἡ), «κεφάλι» + -γενής (< γένος), πρβλ. θεο-γενής, νυμφο-γενής].