The Jurassic–Lower Cretaceous Byers Group, South Shetland Islands, Antarctica: revised stratigraphy and regional correlations

Hathway, B.; Lomas, Simon A.

doi:10.1006/cres.1997.0095

Cited by 45 publications

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“…18A), probably in the context of a sea‐level lowstand. The transition from shallow‐marine to deltaic facies during the earliest Valanginian suggests a lowered sea‐level on Byers Peninsula, Antarctica (Duane, 1996; Hathway & Lomas, 1998; Fig. 18A).…”

Section: Discussionmentioning

confidence: 99%

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Sea-level reconstructions from the Peri-Vocontian Zone (South-east France) point to Valanginian glacio-eustasy

Gréselle¹,

Pittet²

2010

Sedimentology

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International audienceThe Valanginian is a period of global environmental change as illustrated by sedimentary, palaeontological, geochemical and climatic perturbations. A production crisis in most of the carbonate platforms suggests important changes in palaeoenvironmental conditions. During the same time interval, a major positive excursion in delta 13C, the Weissert Event, suggests perturbations of the carbon cycle from the latest Early Valanginian to the Early Hauterivian. In order to better understand the link between these changes, sea-level fluctuations have been reconstructed in detail from the Middle Berriasian to the earliest Hauterivian. Sections from the Peri-Vocontian Zone (South-east France) have been investigated because of the good quality of outcrops on the carbonate platforms, their margins and in the Vocontian Basin. Sections ranging from the most proximal zone (Swiss Jura) to the basin were interpreted in terms of sequence stratigraphy and cyclostratigraphy, and correlated at high resolutions. Using the identified small, medium and large-scale sequences as well as depositional geometries, sea-level fluctuations were reconstructed. Two main trends are evidenced during the studied interval: (i) the peak amplitude (magnitude) of the sea-level fluctuations increased gradually from the Middle Berriasian to the Early Valanginian, and reached a maximum (more than 50 m) from the middle Early Valanginian to the Valanginian/Hauterivian boundary; and (ii) sea-level variations were quite symmetrical during the Late Berriasian, slightly asymmetrical during the Early Valanginian and strongly asymmetrical (fast sea-level rise, slow fall) from the latest Early Valanginian to the earliest Hauterivian. Moreover, three orders of sea-level fluctuations were recognized in the sedimentary rocks of the Peri-Vocontian Zone. Platform-basin correlations and cyclostratigraphic interpretations of the basinal sections evidence an astronomical control on the sea-level variations, mainly by the two eccentricity cycles of 100 and 400 kyr. The increase in the amplitude of the sea-level fluctuations and their change from symmetrical to asymmetrical can be related to the onset of a major cooling event in the Early Valanginian. Fast transgressions followed by slower regressions would correspond to waxing and waning of high-latitudinal ice during most of the Valanginian, especially from the latest Early Valanginian to the latest Late Valanginian. Glacio-eustatic sea-level fluctuations in tune with the 100 and 400 kyr eccentricity cycles are in agreement with glaciations during the Valanginia

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Section: Discussionmentioning

confidence: 99%

“…18A). A major hiatus from the Early/Late Valanginian boundary to the Aptian is probably linked to uplifts (Hathway & Lomas, 1998), but the beginning of the hiatus, nonetheless, correlates with the Late Valanginian global hiatus.…”

Section: Discussionmentioning

confidence: 99%

Sea-level reconstructions from the Peri-Vocontian Zone (South-east France) point to Valanginian glacio-eustasy

Gréselle¹,

Pittet²

2010

Sedimentology

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“…Smellie et al (1980) assigned the Byers Peninsula succession to the Byers Formation, which they divided into four members: Tithonian Mudstone, Berriasian-Valanginian Mixed Marine, Agglomerate, and Lower Cretaceous Volcanic. Hathway and Lomas (1998) revised and extended the lithostratigraphic scheme proposed by Crame et al (1993) and Hathway (1997) and separated the group into five formations: Anchorage (?Kimmeridgian-Tithonian), President Beaches (Berriansian), Start Hill (late Berriansian), Chester Cone (?latest Berriasian-mid Valanginian), and Cerro Negro (early Aptian) ( Figure 5). Hathway and Lomas (1998) revised and extended the lithostratigraphic scheme proposed by Crame et al (1993) and Hathway (1997) and separated the group into five formations: Anchorage (?Kimmeridgian-Tithonian), President Beaches (Berriansian), Start Hill (late Berriansian), Chester Cone (?latest Berriasian-mid Valanginian), and Cerro Negro (early Aptian) ( Figure 5).…”

Section: Byers Peninsula Livingston Island Ssimentioning

confidence: 99%

“…Crame et al (1993) changed the Byers Peninsula succession to group status and divided the strata previously designated as Mudstone and Mixed Marine members into four formations: Anchorage, Devils Point, President Beaches, and Chester Cone. Hathway and Lomas (1998) revised and extended the lithostratigraphic scheme proposed by Crame et al (1993) and Hathway (1997) and separated the group into five formations: Anchorage (?Kimmeridgian-Tithonian), President Beaches (Berriansian), Start Hill (late Berriansian), Chester Cone (?latest Berriasian-mid Valanginian), and Cerro Negro (early Aptian) ( Figure 5). New 40 Ar/ 39 Ar ages from the base (120.3 ± 2.2 Ma on silicic pyroclasti plagioclase) and topmost (119 ± 3.0 Ma on ignimbrite plagioclase) parts of the Cerro Negro formation confirm that the formation was deposited in the early Aptian times (Hathway et al, 1999).…”

Section: Byers Peninsula Livingston Island Ssimentioning

confidence: 99%

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New Paleomagnetic and ⁴⁰Ar/³⁹Ar Geochronological Results for the South Shetland Islands, West Antarctica, and Their Tectonic Implications

et al. 2018

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To reconstruct the paleoposition of the Antarctic Peninsula relative to the South American Plate during the breakup of Gondwana, as well as the opening kinematics of the Drake Passage, we conducted detailed paleomagnetic, rock magnetic, and isotopic chronology studies of Byers Peninsula (Livingston Island) and Fildes Peninsula (King George Island) of the South Shetland Islands. The 40Ar/39Ar ages of the Agate Beach Formation to the Long Hill Formation in Fildes Peninsula range from 56.38 ± 0.2 Ma to 52.42 ± 0.19 Ma. Low natural remanent magnetization/isothermal remanent magnetization ratios, inconsistency with the polarity constrained by the paleomagnetic results and 40Ar/39Ar age constraints, as well as the widespread cation‐deficient titanomagnetite and Ti‐free magnetite of secondary origin, indicate that the volcanic and sedimentary rocks of Fildes Peninsula were remagnetized at about 55 Ma. Combining our results with previous data from the South Shetland Islands and the Antarctic Peninsula, we calculated the paleopoles for 110 Ma and 55 Ma for the South Shetland Islands and the Antarctic Peninsula. The paleomagnetic reconstruction of the relative paleoposition of the Antarctic Peninsula and South America shows that these plates were connected and experienced a southward movement and clockwise rotation from 110 to 55 Ma. Subsequently, southward translation and clockwise rotation of the Antarctic Peninsula between 55 and 27 Ma separated the Antarctic Peninsula and South America, forming the Drake Passage. Northward translation of South America after 27 Ma increased the N‐S divergence and increased the distance between the Antarctic Peninsula and the South American Plate.

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Interannual variability of ground surface thermal regimes in Livingston and Deception islands, Antarctica (2007–2021)

de Pablo,

Ramos,

Vieira

et al. 2023

Land Degrad Dev

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The absence of vegetation in most ice‐free areas of Antarctica makes the soil surface very sensitive to atmosphere dynamics, especially in the western sector of the Antarctic Peninsula, an area within the limits of the permafrost zone. To evaluate the possible effects of regional warming on frozen soils, we conducted an analysis of ground surface temperatures (GSTs) from 2007 to 2021 from different monitoring sites in Livingston and Deception islands (South Shetlands archipelago, Antarctica). The analysis of the interannual evolution of the GST and their daily regimes and the freezing and thawing indexes reveals that climate change is showing impacts on seasonal and perennially frozen soils. Freezing Degree Days (FDD) have decreased while Thawing Degree Day (TDD) have increased during the study period, resulting in a balance that is already positive at the sites at lower elevations. Daily freeze–thaw cycles have been rare and absent since 2014. Meanwhile, the most common thermal regimes are purely frozen – F1 (daily temperatures < = −0.5°C), isothermal – IS (ranging between −0.5°C to +0.5°C), and purely thawed – T1 (> = +0.5°C). A decrease in F1 days has been observed, while the IS and T1 days increased by about 60 days between 2007 and 2021. The annual number of days with snow cover increased between 2009 and 2014 and decreased since then. The GST and the daily thermal regimes evolution point to general heating, which may be indicative of the degradation of the frozen soils in the study area.

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The Jurassic–Lower Cretaceous Byers Group, South Shetland Islands, Antarctica: revised stratigraphy and regional correlations

Cited by 45 publications

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Sea-level reconstructions from the Peri-Vocontian Zone (South-east France) point to Valanginian glacio-eustasy

Sea-level reconstructions from the Peri-Vocontian Zone (South-east France) point to Valanginian glacio-eustasy

New Paleomagnetic and ⁴⁰Ar/³⁹Ar Geochronological Results for the South Shetland Islands, West Antarctica, and Their Tectonic Implications

Interannual variability of ground surface thermal regimes in Livingston and Deception islands, Antarctica (2007–2021)

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The Jurassic–Lower Cretaceous Byers Group, South Shetland Islands, Antarctica: revised stratigraphy and regional correlations

Cited by 45 publications

References 0 publications

Sea-level reconstructions from the Peri-Vocontian Zone (South-east France) point to Valanginian glacio-eustasy

Sea-level reconstructions from the Peri-Vocontian Zone (South-east France) point to Valanginian glacio-eustasy

New Paleomagnetic and 40Ar/39Ar Geochronological Results for the South Shetland Islands, West Antarctica, and Their Tectonic Implications

Interannual variability of ground surface thermal regimes in Livingston and Deception islands, Antarctica (2007–2021)

Contact Info

Product

Resources

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New Paleomagnetic and ⁴⁰Ar/³⁹Ar Geochronological Results for the South Shetland Islands, West Antarctica, and Their Tectonic Implications