Coats Land crustal block, East Antarctica: A tectonic tracer for Laurentia?
Undeformed rhyolite and granophyre in the Coats Land crustal block of East Antarctica, dated as 1112 ± 4 Ma, are identical in age to both the Umkondo large igneous province (LIP) of the Kalahari craton (southern Africa) and the early Keweenawan LIP of Laurentia (North America). Although marine and s...
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| Format: | Journal Article |
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Geological Society of America
2011
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| Online Access: | http://hdl.handle.net/20.500.11937/14588 |
| _version_ | 1848748663093854208 |
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| author | Loewy, S. Dalziel, I. Pisarevsky, Sergei Connelly, J. Tait, J. Hanson, R. Bullen, D. |
| author_facet | Loewy, S. Dalziel, I. Pisarevsky, Sergei Connelly, J. Tait, J. Hanson, R. Bullen, D. |
| author_sort | Loewy, S. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Undeformed rhyolite and granophyre in the Coats Land crustal block of East Antarctica, dated as 1112 ± 4 Ma, are identical in age to both the Umkondo large igneous province (LIP) of the Kalahari craton (southern Africa) and the early Keweenawan LIP of Laurentia (North America). Although marine and satellite data demonstrate that Coats Land was close to Kalahari within the Gondwana supercontinent, the Coats Land rocks yield Pb isotope compositions strikingly distinct from those of the Umkondo province, yet indistinguishable from rocks of the Keweenawan province. The anorogenic Red Bluff granitic suite, along the present-day southern Laurentian margin in the Franklin Mountains (Texas, USA), is of comparable age, general rock type, and Pb isotope composition to rocks of Coats Land and may provide a piercing point for a Coats Land–Laurentia link. Paleomagnetic poles permit the Coats Land block to be close to this part of Laurentia ca. 1100 Ma and allow juxtaposition of Kalahari and southern Laurentia ca. 1000 Ma. The Coats Land crustal block may therefore be a critical tectonic tracer for placing Laurentia within late Mesoproterozoic and Neoproterozoic paleogeographic reconstructions. If this hypothesis is correct, Laurentia collided with the Kalahari craton along Antarctica’s Maud orogen, which would represent a continuation of the ca. 1000 Ma Grenville orogen of eastern and southern Laurentia. |
| first_indexed | 2025-11-14T07:08:37Z |
| format | Journal Article |
| id | curtin-20.500.11937-14588 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:08:37Z |
| publishDate | 2011 |
| publisher | Geological Society of America |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-145882017-09-13T16:02:38Z Coats Land crustal block, East Antarctica: A tectonic tracer for Laurentia? Loewy, S. Dalziel, I. Pisarevsky, Sergei Connelly, J. Tait, J. Hanson, R. Bullen, D. tectonic tracer Laurentia Coats Land Grenville orogen East Antarctica Kalahari craton Undeformed rhyolite and granophyre in the Coats Land crustal block of East Antarctica, dated as 1112 ± 4 Ma, are identical in age to both the Umkondo large igneous province (LIP) of the Kalahari craton (southern Africa) and the early Keweenawan LIP of Laurentia (North America). Although marine and satellite data demonstrate that Coats Land was close to Kalahari within the Gondwana supercontinent, the Coats Land rocks yield Pb isotope compositions strikingly distinct from those of the Umkondo province, yet indistinguishable from rocks of the Keweenawan province. The anorogenic Red Bluff granitic suite, along the present-day southern Laurentian margin in the Franklin Mountains (Texas, USA), is of comparable age, general rock type, and Pb isotope composition to rocks of Coats Land and may provide a piercing point for a Coats Land–Laurentia link. Paleomagnetic poles permit the Coats Land block to be close to this part of Laurentia ca. 1100 Ma and allow juxtaposition of Kalahari and southern Laurentia ca. 1000 Ma. The Coats Land crustal block may therefore be a critical tectonic tracer for placing Laurentia within late Mesoproterozoic and Neoproterozoic paleogeographic reconstructions. If this hypothesis is correct, Laurentia collided with the Kalahari craton along Antarctica’s Maud orogen, which would represent a continuation of the ca. 1000 Ma Grenville orogen of eastern and southern Laurentia. 2011 Journal Article http://hdl.handle.net/20.500.11937/14588 10.1130/G32029.1 Geological Society of America restricted |
| spellingShingle | tectonic tracer Laurentia Coats Land Grenville orogen East Antarctica Kalahari craton Loewy, S. Dalziel, I. Pisarevsky, Sergei Connelly, J. Tait, J. Hanson, R. Bullen, D. Coats Land crustal block, East Antarctica: A tectonic tracer for Laurentia? |
| title | Coats Land crustal block, East Antarctica: A tectonic tracer for Laurentia? |
| title_full | Coats Land crustal block, East Antarctica: A tectonic tracer for Laurentia? |
| title_fullStr | Coats Land crustal block, East Antarctica: A tectonic tracer for Laurentia? |
| title_full_unstemmed | Coats Land crustal block, East Antarctica: A tectonic tracer for Laurentia? |
| title_short | Coats Land crustal block, East Antarctica: A tectonic tracer for Laurentia? |
| title_sort | coats land crustal block, east antarctica: a tectonic tracer for laurentia? |
| topic | tectonic tracer Laurentia Coats Land Grenville orogen East Antarctica Kalahari craton |
| url | http://hdl.handle.net/20.500.11937/14588 |