Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1130/B31686.1 |
Provenance and age constraints of Paleozoic siliciclastic rocks from the Ellsworth Mountains in West Antarctica, as determined by detrital zircon geochronology | |
Castillom, Paula1; Fanning, C. Mark1; Fernandez, Rodrigo2; Poblete, Fernando3,4,5; Herve, Francisco3,6 | |
2017-11-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
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ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2017 |
卷号 | 129 |
文章类型 | Article |
语种 | 英语 |
国家 | Australia; USA; Chile; France |
英文摘要 | New sensitive high-resolution ion microprobe (SHRIMP) U-Pb detrital zircon ages from Cambrian to Permian-Carboniferous siliciclastic units in the Ellsworth Mountains constrain their provenance and maximum depositional age, as well as providing key information as to the tectonic evolution of a problematic region. The Cambrian Heritage Group was deposited in an active continental rift setting and has main zircon components of late Mesoproterozoic-early Neoproterozoic age (ca. 1300-900 Ma) with little to no contributions from older cratons. Two meta-volcaniclastic samples of the Union Glacier Formation (lower Heritage Group) have U-Pb zircon ages of ca. 675 Ma, indicating proximal Cryogenian volcanism and thereby raising questions as to the depositional age of this unit. Igneous and metamorphic zircons of late Neoproterozoic-early Cambrian age (650-530 Ma) are a secondary component present in the upper part of this group. The passive-margin sediments of the overlying Upper Cambrian-Devonian Crashsite Group record an up-sequence increase in late Neoproterozoic-Cambrian detrital zircons (ca. 650-480 Ma). The youngest detrital zircons were dated at ca. 480 Ma with major peaks at ca. 530 Ma and 500 Ma. Similar patterns are recorded in the Permian-Carboniferous Whiteout Conglomerate, with main components at ca. 650-500 Ma, and an absence of detrital zircons younger than Cambrian. The results, combined with stratigraphic constraints, suggest that sediments of the lower Heritage Group were derived from the paleo-Pacific margin of the Australian-Antarctic plate. Cryogenian igneous zircon ages from the Union Glacier Formation indicate proximal rift-related magmatism, previously only recognized in the Transantarctic Mountains, and they are interpreted to relate to the breakup of Rodinia. Sediments from the upper Heritage Group were derived from proximal sources, likely in Coats Land and Dronning Maud Land, with possible extensions into the Shackleton Range. This area was probably uplifted during the final amalgamation of Gondwana, which restricted the supply of sediment from older cratons. Sediments from the Crashsite Group allow for a more expansive source region, which could have been located in Dronning Maud Land, the Shackleton Range, the Transantarctic Mountains, and/or southern Africa. Sediments of the Whiteout Conglomerate, together with comparisons with other coeval glaciogenic strata, indicate that deposition during the Permian-Carboniferous was similar to that in the Transantarctic Mountains. Our data support that the Ells-worth-Whitmore Mountains crustal block was once part of the Australian-Antarctic plate rather than the southern African sector. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000414365400011 |
WOS关键词 | DRONNING MAUD LAND ; ECLOGITE-FACIES METAMORPHISM ; GONDWANA PLATE MARGIN ; U-PB GEOCHRONOLOGY ; EAST ANTARCTICA ; SOUTH-AFRICA ; SALDANIA BELT ; TRANSANTARCTIC MOUNTAINS ; KAROO BASIN ; SHACKLETON RANGE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/25212 |
专题 | 地球科学 |
作者单位 | 1.Australian Natl Univ, Res Sch Earth Sci, Mills Rd, Canberra, ACT 0200, Australia; 2.Univ Texas Austin, Inst Geophys, Jackson Sch Geosci, 10100 Burnet Rd, Austin, TX 78758 USA; 3.Univ Chile, Dept Geol, Plaza Ercilla 803, Santiago, Chile; 4.Univ Rennes 1, Geosci Rennes, F-35042 Rennes, France; 5.Univ OHiggins, Inst Ciencias Ingn, Gamero 357, Rancagua, Chile; 6.Univ Nacl Andres Bello, Carrera Geol, Sazie 2119, Santiago, Chile |
推荐引用方式 GB/T 7714 | Castillom, Paula,Fanning, C. Mark,Fernandez, Rodrigo,et al. Provenance and age constraints of Paleozoic siliciclastic rocks from the Ellsworth Mountains in West Antarctica, as determined by detrital zircon geochronology[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2017,129. |
APA | Castillom, Paula,Fanning, C. Mark,Fernandez, Rodrigo,Poblete, Fernando,&Herve, Francisco.(2017).Provenance and age constraints of Paleozoic siliciclastic rocks from the Ellsworth Mountains in West Antarctica, as determined by detrital zircon geochronology.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,129. |
MLA | Castillom, Paula,et al."Provenance and age constraints of Paleozoic siliciclastic rocks from the Ellsworth Mountains in West Antarctica, as determined by detrital zircon geochronology".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 129(2017). |
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