Lost Terranes of Zealandia: possible development of late Paleozoic and early Mesozoic sedimentary basins at the southwest Pacific margin of Gondwanaland, and their destination as terranes in southern South America.
Lost Terranes of Zealandia: possible development of late Paleozoic and early Mesozoic sedimentary basins at the southwest Pacific margin of Gondwanaland, and their destination as terranes in southern South America
| dc.contributor | en-US | |
| dc.contributor | es-ES | |
| dc.creator | Adams, Christopher | |
| dc.date | 2010-08-17 | |
| dc.identifier | http://www.andeangeology.cl/index.php/revista1/article/view/V37n2-a10 | |
| dc.identifier | 10.5027/andgeoV37n2-a10 | |
| dc.description | Latest Precambrian to Ordovician metasedimentary successions and Cambrian-Ordovician and Devonian-Carboniferous granitoids form the major part of the basement of southern Zealandia and adjacent sectors of Antarctica and southeast Australia. Uplift/cooling ages of these rocks, and local Devonian shallow-water cover sequences suggest that final consolidation ofthe basement occurred through Late Paleozoic time. Anecessary consequence ofthis process would have been contemporaneous erosion and the substantial development of marine sedimentary basins at the Pacific margin of Zealandia. These are found nowhere at the present day, suggesting that the basins have been lost by tectonic erosion, perhaps in a margin-parallel dextral translation similar to late Paleozoic-Mesozoic suspect terranes of New Zealand. A probable detrital zircon age pattern is assembled for these lost Zealandia sediments, and then compared with those of pre-Jurassic (probable Triassic to Devonian) metasedimentary rocks in the Chilean archipelago. Significant Mesoproterozoic, latest Neoproterozoic-Cambrian and Devonian-Carboniferous detrital zircon age components are common to both, thus supporting a possible Chilean terrane destination for these 'lost terranes of Zealandia'. | en-US |
| dc.description | RESUMEN. Terrenos perdidos de Zealandia: posible desarrollo de cuencas sedimentarias del Paleozoico tardio y Mesozoico temprano en el margen suroccidental del Pacifico de Gondwana y su destino como terrenos en el sur de America del Sur. Las sucesiones metasedimentarias del Precambrico tardio al Ordovicico y granitoides del Cambrico-Ordovicico y Devonico-Carbonifero constituyen la mayor parte del basamento del sur de Zealandia y sectores adyacentes de la Antartica y el sudeste de Australia. Las edades de enfriamiento/alzamiento de estas rocas y la cobertura local de secuencias de aguas someras del Devonico, sugieren que la consolidacion definitiva del basamento se produjo durante el Paleozoico tardio. Una consecuencia necesaria de este proceso habria sido la erosion contemporanea y el desarrollo sustancial de cuencas sedimentarias marinas en el margen del Pacifico de Zealandia. Estas no se encuentran en ninguna parte en la actualidad, lo que sugiere que las cuencas se han perdido por erosion tectonica, tal vez en una traslacion dextral paralela al margen similar a los terrenos del Paleozoico tardio-Mesozoico de Nueva Ze1aoda. Hay una agrupacion que da un probable patron de edad de circones detriticos para estos sedimentos de la perdida Zealandia, comparables con aquellos de rocas metasedimentarias del pre-Jurasico (probable Triasico a Devonico) del archipielago chileno. Importantes componentes de edades de circones detriticos del Mesoproterozoicos, Neoproterozoico tardio-Cambrico y Devonico-Carbonifero son comunes a ambas regiones, favoreciendo asi un posible destino chileno para estos 'terrenos perdidos de Zealandia'. | es-ES |
| dc.format | application/pdf | |
| dc.format | text/html | |
| dc.language | eng | |
| dc.publisher | Servicio Nacional de Geología y Minería | en-US |
| dc.relation | http://www.andeangeology.cl/index.php/revista1/article/view/V37n2-a10/1019 | |
| dc.relation | http://www.andeangeology.cl/index.php/revista1/article/view/V37n2-a10/html | |
| dc.source | Andean Geology; Vol 37, No 2 (2010); 442-454 | es-ES |
| dc.source | Andean Geology; Vol 37, No 2 (2010); 442-454 | en-US |
| dc.source | 0718-7106 | |
| dc.source | 0718-7092 | |
| dc.title | Lost Terranes of Zealandia: possible development of late Paleozoic and early Mesozoic sedimentary basins at the southwest Pacific margin of Gondwanaland, and their destination as terranes in southern South America. | en-US |
| dc.title | Lost Terranes of Zealandia: possible development of late Paleozoic and early Mesozoic sedimentary basins at the southwest Pacific margin of Gondwanaland, and their destination as terranes in southern South America | es-ES |
| dc.type | info:eu-repo/semantics/article | |
| dc.type | info:eu-repo/semantics/publishedVersion | |
| dc.type | es-ES | |
| dc.type | en-US |
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Andean Geology
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