Age and petrogenesis of the Sarmiento ophiolite complex of southern Chile
Zircon fractions separated from fine-grained plagiogranites, interpreted to be cogenetic with the mafic rocks of the Sarmiento ophiolite complex in southern Chile, yield slightly to grossly discordant age patterns for which the lower concordia intercept U-Pb ages of 140.7 +/- 0.7 Ma (Lolos Fjord) an...
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ftumdeepblue:oai:deepblue.lib.umich.edu:2027.42/29957 2023-08-20T04:09:50+02:00 Age and petrogenesis of the Sarmiento ophiolite complex of southern Chile Stern, C. R. Mukasa, Samuel B. Fuenzalida P. , R. Department of Geological Sciences, University of Michigan, Ann Arbor, MI 48109-1063, USA Department of Geological Sciences, University of Colorado, Boulder, CO 80309-0250, USA Empresa Nacional del Petroleo, Casilla 11135, Santiago, Chile 1992 656290 bytes 3118 bytes application/pdf text/plain http://hdl.handle.net/2027.42/29957 http://www.sciencedirect.com/science/article/B6VDS-48B0P51-23/2/16d4ffe896c5a08829cd6a8953ec3e85 https://doi.org/10.1016/0895-9811(92)90020-Y en_US eng Elsevier Stern, C. R., Mukasa, S. B., Fuenzalida P., R. (1992)."Age and petrogenesis of the Sarmiento ophiolite complex of southern Chile." Journal of South American Earth Sciences 6(1-2): 97-104. <http://hdl.handle.net/2027.42/29957> http://www.sciencedirect.com/science/article/B6VDS-48B0P51-23/2/16d4ffe896c5a08829cd6a8953ec3e85 http://hdl.handle.net/2027.42/29957 http://dx.doi.org/10.1016/0895-9811(92)90020-Y Journal of South American Earth Sciences IndexNoFollow Geology and Earth Sciences Science Article 1992 ftumdeepblue https://doi.org/10.1016/0895-9811(92)90020-Y 2023-07-31T20:56:40Z Zircon fractions separated from fine-grained plagiogranites, interpreted to be cogenetic with the mafic rocks of the Sarmiento ophiolite complex in southern Chile, yield slightly to grossly discordant age patterns for which the lower concordia intercept U-Pb ages of 140.7 +/- 0.7 Ma (Lolos Fjord) and 137.1 +/- 0.6 Ma (Encuentro Fjord) are well constrained. These dates are interpreted as formation ages for the northern portion of the igneous floor of the Rocas Verdes basin, and they are younger than the age of 150 Ma determined for a more southern portion of the floor of this basin on South Georgia Island. Coarse-grained trondjemites within the gabbro units of the Sarmiento complex yield a lower concordia intercept U-Pb age of 147 +/- 10 Ma and a poorly defined upper intercept reflecting an inherited zircon component, possibly of Proterozoic age. These rocks are interpreted as remobilized fragments of country rocks entrapped within the essentially mantle-derived rocks of the ophiolite complex. Peer Reviewed http://deepblue.lib.umich.edu/bitstream/2027.42/29957/1/0000318.pdf Article in Journal/Newspaper South Georgia Island University of Michigan: Deep Blue South Georgia Island ENVELOPE(-36.750,-36.750,-54.250,-54.250) Rocas ENVELOPE(-56.948,-56.948,-63.398,-63.398) Sarmiento ENVELOPE(-68.000,-68.000,-72.000,-72.000) Journal of South American Earth Sciences 6 1-2 97 104 |
institution |
Open Polar |
collection |
University of Michigan: Deep Blue |
op_collection_id |
ftumdeepblue |
language |
English |
topic |
Geology and Earth Sciences Science |
spellingShingle |
Geology and Earth Sciences Science Stern, C. R. Mukasa, Samuel B. Fuenzalida P. , R. Age and petrogenesis of the Sarmiento ophiolite complex of southern Chile |
topic_facet |
Geology and Earth Sciences Science |
description |
Zircon fractions separated from fine-grained plagiogranites, interpreted to be cogenetic with the mafic rocks of the Sarmiento ophiolite complex in southern Chile, yield slightly to grossly discordant age patterns for which the lower concordia intercept U-Pb ages of 140.7 +/- 0.7 Ma (Lolos Fjord) and 137.1 +/- 0.6 Ma (Encuentro Fjord) are well constrained. These dates are interpreted as formation ages for the northern portion of the igneous floor of the Rocas Verdes basin, and they are younger than the age of 150 Ma determined for a more southern portion of the floor of this basin on South Georgia Island. Coarse-grained trondjemites within the gabbro units of the Sarmiento complex yield a lower concordia intercept U-Pb age of 147 +/- 10 Ma and a poorly defined upper intercept reflecting an inherited zircon component, possibly of Proterozoic age. These rocks are interpreted as remobilized fragments of country rocks entrapped within the essentially mantle-derived rocks of the ophiolite complex. Peer Reviewed http://deepblue.lib.umich.edu/bitstream/2027.42/29957/1/0000318.pdf |
author2 |
Department of Geological Sciences, University of Michigan, Ann Arbor, MI 48109-1063, USA Department of Geological Sciences, University of Colorado, Boulder, CO 80309-0250, USA Empresa Nacional del Petroleo, Casilla 11135, Santiago, Chile |
format |
Article in Journal/Newspaper |
author |
Stern, C. R. Mukasa, Samuel B. Fuenzalida P. , R. |
author_facet |
Stern, C. R. Mukasa, Samuel B. Fuenzalida P. , R. |
author_sort |
Stern, C. R. |
title |
Age and petrogenesis of the Sarmiento ophiolite complex of southern Chile |
title_short |
Age and petrogenesis of the Sarmiento ophiolite complex of southern Chile |
title_full |
Age and petrogenesis of the Sarmiento ophiolite complex of southern Chile |
title_fullStr |
Age and petrogenesis of the Sarmiento ophiolite complex of southern Chile |
title_full_unstemmed |
Age and petrogenesis of the Sarmiento ophiolite complex of southern Chile |
title_sort |
age and petrogenesis of the sarmiento ophiolite complex of southern chile |
publisher |
Elsevier |
publishDate |
1992 |
url |
http://hdl.handle.net/2027.42/29957 http://www.sciencedirect.com/science/article/B6VDS-48B0P51-23/2/16d4ffe896c5a08829cd6a8953ec3e85 https://doi.org/10.1016/0895-9811(92)90020-Y |
long_lat |
ENVELOPE(-36.750,-36.750,-54.250,-54.250) ENVELOPE(-56.948,-56.948,-63.398,-63.398) ENVELOPE(-68.000,-68.000,-72.000,-72.000) |
geographic |
South Georgia Island Rocas Sarmiento |
geographic_facet |
South Georgia Island Rocas Sarmiento |
genre |
South Georgia Island |
genre_facet |
South Georgia Island |
op_relation |
Stern, C. R., Mukasa, S. B., Fuenzalida P., R. (1992)."Age and petrogenesis of the Sarmiento ophiolite complex of southern Chile." Journal of South American Earth Sciences 6(1-2): 97-104. <http://hdl.handle.net/2027.42/29957> http://www.sciencedirect.com/science/article/B6VDS-48B0P51-23/2/16d4ffe896c5a08829cd6a8953ec3e85 http://hdl.handle.net/2027.42/29957 http://dx.doi.org/10.1016/0895-9811(92)90020-Y Journal of South American Earth Sciences |
op_rights |
IndexNoFollow |
op_doi |
https://doi.org/10.1016/0895-9811(92)90020-Y |
container_title |
Journal of South American Earth Sciences |
container_volume |
6 |
container_issue |
1-2 |
container_start_page |
97 |
op_container_end_page |
104 |
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1774723543777411072 |