A Discussion on the evolution of the Precambrian crust - Crustal development in the Precambrian
The oldest Archaean rocks in most shield regions are largely granulites and gneisses, and in west Greenland there is evidence of 1000 Ma of crustal history before the final high-grade metamorphism. Archaean greenstone belts are mostly younger than the high-grade terrains although in some areas, such...
Published in: | Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
The Royal Society
1973
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1098/rsta.1973.0004 https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.1973.0004 |
id |
crroyalsociety:10.1098/rsta.1973.0004 |
---|---|
record_format |
openpolar |
spelling |
crroyalsociety:10.1098/rsta.1973.0004 2024-06-02T08:07:32+00:00 A Discussion on the evolution of the Precambrian crust - Crustal development in the Precambrian 1973 http://dx.doi.org/10.1098/rsta.1973.0004 https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.1973.0004 en eng The Royal Society https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences volume 273, issue 1235, page 321-341 ISSN 0080-4614 2054-0272 journal-article 1973 crroyalsociety https://doi.org/10.1098/rsta.1973.0004 2024-05-07T14:16:50Z The oldest Archaean rocks in most shield regions are largely granulites and gneisses, and in west Greenland there is evidence of 1000 Ma of crustal history before the final high-grade metamorphism. Archaean greenstone belts are mostly younger than the high-grade terrains although in some areas, such as southern Africa, this has not yet been proved reliably. The greenstone belts may have developed as oceanic crust in connexion with plate movements, the earlier continents being represented by the more deeply eroded high-grade regions. Stabilization of the Archaean cratons is signalled by continental-scale intrusion of dolerite dyke swarms. Proterozoic mobile belts are exposed at two structural levels. Some early linear basins have mio- and eu-geosynclinal parts and may have been located along Proterozoic suture lines. More deeply eroded mobile belts are often floored by extensive, partly reworked, crystalline basement and probably developed along linear rifted zones which acted as loci for high heat flow and igneous activity; they lack ophiolites and are difficult to interpret as collision-type mountain belts. Most probably there were intra-continental plate movements in the Proterozoic. Article in Journal/Newspaper Greenland The Royal Society Greenland Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences 273 1235 321 341 |
institution |
Open Polar |
collection |
The Royal Society |
op_collection_id |
crroyalsociety |
language |
English |
description |
The oldest Archaean rocks in most shield regions are largely granulites and gneisses, and in west Greenland there is evidence of 1000 Ma of crustal history before the final high-grade metamorphism. Archaean greenstone belts are mostly younger than the high-grade terrains although in some areas, such as southern Africa, this has not yet been proved reliably. The greenstone belts may have developed as oceanic crust in connexion with plate movements, the earlier continents being represented by the more deeply eroded high-grade regions. Stabilization of the Archaean cratons is signalled by continental-scale intrusion of dolerite dyke swarms. Proterozoic mobile belts are exposed at two structural levels. Some early linear basins have mio- and eu-geosynclinal parts and may have been located along Proterozoic suture lines. More deeply eroded mobile belts are often floored by extensive, partly reworked, crystalline basement and probably developed along linear rifted zones which acted as loci for high heat flow and igneous activity; they lack ophiolites and are difficult to interpret as collision-type mountain belts. Most probably there were intra-continental plate movements in the Proterozoic. |
format |
Article in Journal/Newspaper |
title |
A Discussion on the evolution of the Precambrian crust - Crustal development in the Precambrian |
spellingShingle |
A Discussion on the evolution of the Precambrian crust - Crustal development in the Precambrian |
title_short |
A Discussion on the evolution of the Precambrian crust - Crustal development in the Precambrian |
title_full |
A Discussion on the evolution of the Precambrian crust - Crustal development in the Precambrian |
title_fullStr |
A Discussion on the evolution of the Precambrian crust - Crustal development in the Precambrian |
title_full_unstemmed |
A Discussion on the evolution of the Precambrian crust - Crustal development in the Precambrian |
title_sort |
discussion on the evolution of the precambrian crust - crustal development in the precambrian |
publisher |
The Royal Society |
publishDate |
1973 |
url |
http://dx.doi.org/10.1098/rsta.1973.0004 https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.1973.0004 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences volume 273, issue 1235, page 321-341 ISSN 0080-4614 2054-0272 |
op_rights |
https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ |
op_doi |
https://doi.org/10.1098/rsta.1973.0004 |
container_title |
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences |
container_volume |
273 |
container_issue |
1235 |
container_start_page |
321 |
op_container_end_page |
341 |
_version_ |
1800752620124504064 |