FORMATION OF EARTH'S EARLY ARCHAEAN CONTINENTAL CRUST
- DSpace Home
- →
- Геология России
- →
- ELibrary
- →
- View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.
dc.contributor.author | Smithies R.H. | |
dc.contributor.author | Champion D.C. | |
dc.contributor.author | Cassidy K.F. | |
dc.date.accessioned | 2022-02-17T11:03:56Z | |
dc.date.available | 2022-02-17T11:03:56Z | |
dc.date.issued | 2003 | |
dc.identifier | https://elibrary.ru/item.asp?id=13817760 | |
dc.identifier.citation | Precambrian Research, 2003, 127, 1-3, 89-101 | |
dc.identifier.issn | 0301-9268 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/35524 | |
dc.description.abstract | Subduction of oceanic crust at an unusually low-angle has been proposed as a model for the growth of continental crust older than about 2.5 Ga. At modern zones of low-angle-, or flat-subduction, magmatic additions to new crust come from partial melting of both the subducting oceanic crust (slab) and the thin wedge of mantle above the slab. Evidence for both a slab and wedge source is preserved in most late Archaean (3.0–2.5 Ga) terrains, but we find little evidence that a mantle wedge contributed to crustal growth prior to ∼3.1 Ga. This lack of evidence in part reflects a dearth of exposed crust aged between 3.0 and 3.3 Ga, but also suggests that subduction enriched mantle source regions did not develop before ∼3.3 Ga and possibly not before 3.1 Ga. In contrast to most modern terrains and some late-Archaean terrains, early Archaean (>∼3.3 Ga) continental crust evolved through direct melting of thick mafic crust. We invoke a process of subduction that does not include the development of a mantle wedge, and call this process Archaean flat-subduction to distinguish it from modern low-angle subduction. | |
dc.subject | Archaean | |
dc.subject | Crustal evolution | |
dc.subject | Magmatism | |
dc.subject | Low-angle subduction | |
dc.subject | Enriched mantle | |
dc.title | FORMATION OF EARTH'S EARLY ARCHAEAN CONTINENTAL CRUST | |
dc.type | Статья | |
dc.subject.age | Precambrian::Archean | |
dc.subject.age | Докембрий::Архей | ru |
Files in this item
This item appears in the following Collection(s)
-
ELibrary
Метаданные публикаций с сайта https://www.elibrary.ru