Nonmarine Sedimentation in an Early Cretaceous Extensional Continental-Margin Arc, Byers Peninsula, Livingston Island, South Shetland Islands

Hathway, B.

doi:10.1306/d4268617-2b26-11d7-8648000102c1865d

Cited by 36 publications

(39 citation statements)

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“…Lava flows with subordinate pyroclastic deposits, small intrusive bodies and mafic to felsic plutons Smellie et al, 1984). The age data were compiled from the previous works (Smellie et al, 1984;Hathway, 1997;Zheng et al, 1998;Machado et al, 2005b Lawver et al, 1996). Arrows indicate direction of plate motion in the Cretaceous and Tertiary (McCarron and Larter, 1998 make up a typical subduction-related association with calc-alkaline to tholeiitic compositions.…”

Section: Geological Backgroundmentioning

confidence: 99%

Trace element and isotopic evidence for temporal changes of the mantle sources in the South Shetland Islands, Antarctica

Lee

Choe

et al. 2008

Geochem. J.

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We present Sr-Nd-Pb isotope data from the Paleocene-Eocene volcanic rocks in King George Island, South Shetland Islands, West Antarctica. We interpret these data in combination with previously published trace and isotope data for Meso-Cenozoic volcanic rocks in the South Shetland Islands to gain a better understanding of the geochemical evolution of the mantle source region. The studied rocks are from four volcanic islands and range in age from 143 to 44 Ma. They have high abundances of large ion lithophile elements and light rare earth elements relative to high field strength elements, consistent with products of subduction related magmatism. The systematic inter-island variations are recognized from a comprehensive examination of the trace elements and isotopic compositions. The degree of enrichment of Sr-Nd-Pb isotopic compositions decreases towards younger samples, while the ratios of fluid-mobile elements/ HFSE (Sr/Yb, Pb/Yb and U/Yb) gradually increase. The previous studies on these volcanic rocks concluded that the compositional variations of the South Shetland Islands volcanic suites were mainly controlled by two component mixing between altered MORB and Pacific sediments. However, we here propose that the compositional trends observed in the volcanic rocks of the South Shetland Islands can be created from the addition of a relatively constant subduction component to temporally varying heterogeneous mantle sources. The higher radiogenic Pb and Sr isotopes and lower 143 Nd/ 144 Nd ratios of the older volcanic rocks from Greenwich and Livingston islands compared to younger rocks can be explained by the significant influence of enriched previously metasomatized mantle material rather than fluids or sediment melts from the subducting slab. In contrast, the geochemical nature of the youngest King George Island volcanic rocks suggests a relatively large contribution of a slab-derived fluid component to the magma generation, but a minor role of the enriched component.

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Section: Geological Backgroundmentioning

confidence: 99%

Trace element and isotopic evidence for temporal changes of the mantle sources in the South Shetland Islands, Antarctica

Lee

Choe

et al. 2008

Geochem. J.

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“…1). Further north, in the South Shetland Islands, Early Cretaceous (Aptian) intra-arc deposits record the burial of existing topography through the development of local calc-alkaline volcanic edifices (Hathway 1997) (Fig. 1).…”

Section: Geological Settingmentioning

confidence: 99%

“…The basal Gustav Group, of the James Ross Island Basin, yields sparse fossil wood (Francis 1986;Ottone & Medina 1998;Francis & Poole 2002), and only wood from the early Albian Kotick Point Formation has been formally described (Ottone & Medina 1998 (Hathway 1997). This unit accumulated in a terrestrial intra-arc setting, and was dominated by volcanic processes.…”

Section: Aptian and Albian Intervalmentioning

confidence: 99%

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Cretaceous and Cenozoic vegetation of Antarctica integrating the fossil wood record

Poole

Cantrill

2006

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A compilation of data for Cretaceous and Cenozoic Antarctic fossil wood floras, predominantly from the James Ross Island Basin, provides a different perspective on floristic and vegetation change when compared with previous studies that have focused on leaf macrofossils or palynology. The wood record provides a filtered view of tree-forming elements within the vegetation, something that cannot be achieved from studies focusing on regional palynology or leaf floras. Four phases of vegetation development in the over-storey are recognized in the Cretaceous and Cenozoic of the Antarctic Peninsula based on the distribution and taxonomic composition of wood floras: Aptian-Albian coniferous forests; ?Cenomanian-Santonian mixed angiosperm forests; Campanian-Maastrichtian southern temperate forests; and Palaeocene-Eocene reduced diversity Nothofagus forests. Comparisons between the wood record and information derived from palynological and leaf floras have important implications for our understanding of the spatial composition of the vegetation. There is no doubt that climate change during the Cretaceous and Tertiary influenced the vegetational composition, but evolving palaeoenvironments in the Antarctic Peninsula region were probably of equal, if not greater, importance.

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“…Similar shifts in taxonomic composition and abundance can be seen in local vertical successions. For example, the Aptian Cerro Negro Formation on Byers Peninsula and Snow Island developed on pre-existing landscape with topographic relief (Hathway, 1997). This landscape has soil surfaces and tree material that indicates araucarian-and podocarp-dominated communities.…”

Section: Vertical Variation In Abundance Of Taxamentioning

confidence: 99%

Taxonomic turnover and abundance in Cretaceous to Tertiary wood floras of Antarctica: implications for changes in forest ecology

Cantrill

Poole

2005

Palaeogeography, Palaeoclimatology, Palaeoecology

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Based on the temporal distribution, abundance, and taxonomic composition of wood floras, four phases of vegetation development are recognized through the Cretaceous to Early Tertiary of the Antarctic Peninsula: (1) Aptian to Albian communities dominated by podocarpaceous, araucarian, and minor taxodiaceous/cupressaceous conifers with rare extinct gymnosperms (Sahnioxylon). (2) Progressive replacement of these communities in ?Cenomanian to Santonian times by angiosperms, most without modern analogues. (3) Increasing dominance of angiosperms becoming important both in terms of diversity and abundance towards the mid-Late Cretaceous. (4) Modernization of the flora during the Campanian to Maastrichtian with the extinction of earlier forms, appearance of the Nothofagaceae and diversification of associated elements. These patterns broadly follow trends seen in the leaf and palynological record but with some important differences.During the Cretaceous, conifer composition undergoes a change whereby Phyllocladoxylon-type woods increase relative to the older Podocarpoxylon forms. During the Paleocene to Eocene period, a marked extinction in wood types occurs associated with an increase in the abundance of nothofagaceous wood. Detailed examination of wood abundance and distributions from sections within Maastrichtian and Paleocene formations points to strong environmental control on taxonomic compositions. Similar differences are encountered when comparing coeval floras from different geographic regions and palaeoenvironments. D

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Nonmarine Sedimentation in an Early Cretaceous Extensional Continental-Margin Arc, Byers Peninsula, Livingston Island, South Shetland Islands

Cited by 36 publications

References 0 publications

Trace element and isotopic evidence for temporal changes of the mantle sources in the South Shetland Islands, Antarctica

Trace element and isotopic evidence for temporal changes of the mantle sources in the South Shetland Islands, Antarctica

Cretaceous and Cenozoic vegetation of Antarctica integrating the fossil wood record

Taxonomic turnover and abundance in Cretaceous to Tertiary wood floras of Antarctica: implications for changes in forest ecology

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