East Greenland Caledonides: stratigraphy, structure and geochronology: Palaeoproterozoic age of a basement gneiss complex in the Charcot Land tectonic window, East Greenland Caledonides
The Charcot Land tectonic window exposes crystalline basement gneisses, which form part of the foreland of the East Greenland Caledonides. These gneisses were previously believed to beArchaean in age, on the basis of imprecise K-Ar analyses carried out in the early 1980s on hornblende from amphiboli...
| Main Author: | |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Geological Survey of Denmark and Greenland
2004-12-01
|
| Series: | Geological Survey of Denmark and Greenland Bulletin |
| Subjects: | |
| Online Access: | http://www.geus.dk/publications/bull/nr6/nr6_p57-66.pdf |
| _version_ | 1818020311399923712 |
|---|---|
| author | Thrane, Kristine |
| author_facet | Thrane, Kristine |
| author_sort | Thrane, Kristine |
| collection | DOAJ |
| description | The Charcot Land tectonic window exposes crystalline basement gneisses, which form part of the foreland of the East Greenland Caledonides. These gneisses were previously believed to beArchaean in age, on the basis of imprecise K-Ar analyses carried out in the early 1980s on hornblende from amphibolitic bands and inconclusive Rb/Sr isotope data. New U-Pb singlezircon ion microprobe analyses on the gneisses of the window yield upper intercept ages of 1916 ± 21 and 1928 ± 11 Ma, and are interpreted to represent the age of crystallisation of the igneous protolith. The foreland gneisses of the Charcot Land window are similar in age to parts of the allochthonous gneiss complexes of structurally overlying thrust sheets, but the two terranes have different lithological and structural characteristics. No Archaean rocks have been identified with certainty in any of the East Greenland Caledonian foreland windows. |
| first_indexed | 2024-04-14T08:03:34Z |
| format | Article |
| id | doaj.art-a6b67fcd182c4d51860c21dd5f63c1d9 |
| institution | Directory Open Access Journal |
| issn | 1604-8156 |
| language | English |
| last_indexed | 2024-04-14T08:03:34Z |
| publishDate | 2004-12-01 |
| publisher | Geological Survey of Denmark and Greenland |
| record_format | Article |
| series | Geological Survey of Denmark and Greenland Bulletin |
| spelling | doaj.art-a6b67fcd182c4d51860c21dd5f63c1d92022-12-22T02:04:49ZengGeological Survey of Denmark and GreenlandGeological Survey of Denmark and Greenland Bulletin1604-81562004-12-01065766East Greenland Caledonides: stratigraphy, structure and geochronology: Palaeoproterozoic age of a basement gneiss complex in the Charcot Land tectonic window, East Greenland CaledonidesThrane, KristineThe Charcot Land tectonic window exposes crystalline basement gneisses, which form part of the foreland of the East Greenland Caledonides. These gneisses were previously believed to beArchaean in age, on the basis of imprecise K-Ar analyses carried out in the early 1980s on hornblende from amphibolitic bands and inconclusive Rb/Sr isotope data. New U-Pb singlezircon ion microprobe analyses on the gneisses of the window yield upper intercept ages of 1916 ± 21 and 1928 ± 11 Ma, and are interpreted to represent the age of crystallisation of the igneous protolith. The foreland gneisses of the Charcot Land window are similar in age to parts of the allochthonous gneiss complexes of structurally overlying thrust sheets, but the two terranes have different lithological and structural characteristics. No Archaean rocks have been identified with certainty in any of the East Greenland Caledonian foreland windows.http://www.geus.dk/publications/bull/nr6/nr6_p57-66.pdfCaledonidesEast GreenlandgeochronologyPalaeoproterozoic |
| spellingShingle | Thrane, Kristine East Greenland Caledonides: stratigraphy, structure and geochronology: Palaeoproterozoic age of a basement gneiss complex in the Charcot Land tectonic window, East Greenland Caledonides Geological Survey of Denmark and Greenland Bulletin Caledonides East Greenland geochronology Palaeoproterozoic |
| title | East Greenland Caledonides: stratigraphy, structure and geochronology: Palaeoproterozoic age of a basement gneiss complex in the Charcot Land tectonic window, East Greenland Caledonides |
| title_full | East Greenland Caledonides: stratigraphy, structure and geochronology: Palaeoproterozoic age of a basement gneiss complex in the Charcot Land tectonic window, East Greenland Caledonides |
| title_fullStr | East Greenland Caledonides: stratigraphy, structure and geochronology: Palaeoproterozoic age of a basement gneiss complex in the Charcot Land tectonic window, East Greenland Caledonides |
| title_full_unstemmed | East Greenland Caledonides: stratigraphy, structure and geochronology: Palaeoproterozoic age of a basement gneiss complex in the Charcot Land tectonic window, East Greenland Caledonides |
| title_short | East Greenland Caledonides: stratigraphy, structure and geochronology: Palaeoproterozoic age of a basement gneiss complex in the Charcot Land tectonic window, East Greenland Caledonides |
| title_sort | east greenland caledonides stratigraphy structure and geochronology palaeoproterozoic age of a basement gneiss complex in the charcot land tectonic window east greenland caledonides |
| topic | Caledonides East Greenland geochronology Palaeoproterozoic |
| url | http://www.geus.dk/publications/bull/nr6/nr6_p57-66.pdf |
| work_keys_str_mv | AT thranekristine eastgreenlandcaledonidesstratigraphystructureandgeochronologypalaeoproterozoicageofabasementgneisscomplexinthecharcotlandtectonicwindoweastgreenlandcaledonides |