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Gohl, Karsten

doi:10.3133/of2007-1047.srp001

Cited by 6 publications

(4 citation statements)

References 39 publications

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“…ANTPAC 1997/1998 Project along with data provided by the British Antarctic Survey (BAS). The Italian Instituto Nazionale di Oceanografía e di Geofisica Sperimentale (OGS), the Brazilian Antarctic Program, and Rice University (Texas, USA) also provided data used to assess morphology and stratigraphic correlation of seismic units and discontinuities within the study area (Scientific Committee on Antarctic Research Seismic Data Library System, Cooper et al, 1991, SCAR, 2001Wardell et al, 2007). Figure 4 shows the network of seismic profiles compiled for the study area, which has the densest bathymetric and seismic coverage of any region along the PMAP.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Neogene to Quaternary stratigraphic evolution of the Antarctic Peninsula, Pacific Margin offshore of Adelaide Island: Transitions from a non-glacial, through glacially-influenced to a fully glacial state

Hernández-Molina

Larter

Maldonado

2017

Global and Planetary Change

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A detailed morphologic and seismic stratigraphic analysis of the continental margin offshore of Adelaide Island on the Pacific Margin of the Antarctic Peninsula (PMAP) is described based on the study of a regular network of reflection multichannel seismic profiles and swath bathymetry. We present an integrated study of the margin spanning the shelf to the continental rise and establish novel chronologic constraints and offer new interpretations on tectonic evolution and environmental changes affecting the PMAP. The stratigraphic stacking patterns record major shifts in the depositional style of the margin that outline three intervals in its evolution. The first non-glacial interval (Early Cretaceous to middle Miocene) encompasses a transition from an active to a passive margin (early Miocene). The second glacially-influenced interval (middle to late Miocene) is marked by pronounced aggradational sedimentary stacking and subsidence. Ice sheets advanced over the middle shelf of the margin at the end of this second interval, while the outer shelf experienced rare progradational events. The third, fully glaciated interval shows clear evidence of glacially dominated conditions on the margin. This interval divides into three minor stages. During the first stage (late Miocene to the beginning of the early Pliocene), frequent grounded ice advances to the shelf break began, depositing an initial progradational unit. A major truncation surface marked the end of this stage, which coincided with extensive mass transport deposits at the base of the slope. During the second progradational glacial margin stage (early Pliocene to middle Pleistocene), stacking patterns record clearly prograding glacial sequences. The beginning of the third aggradational glacial margin stage (middle Pleistocene to present) corresponded to an important shift in global climate during the Mid-Pleistocene Transition. Morphosedimentary characteristics observed along the margin today began to develop during the latest Miocene but did not become fully established until sometime during the interval between the end of the Pliocene and middle Pleistocene. Between these two time intervals, the northeast lateral migration of the Marguerite Trough also played a critical role in margin evolution, as it controlled ice sheet drainage pathways across the shelf, which in turn influenced development of slope and rise morphologies. Areas offshore from Adelaide Island differ from other areas of the PMAP due to changes in sedimentary processes that resulted from migration of the trough. This study confirms that the PMAP represents an exceptional locality for decoding, reconstructing and linking past tectonic and climatic changes. The study area specifically records not only the most relevant changes in depositional style, but also the relative importance of persistent along-and down-slope sedimentary processes. Our study approach can be extended to other areas and integrated with additional techniques to understand the evolution and the global linkages of the entire An...

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Section: Accepted Manuscriptmentioning

confidence: 99%

“…Hernández-Molina spent at the British Antarctic Survey (BAS) in 2003, 2004, 2005 and 2007, as SCAR, 2001;Wardell et al, 2007). The authors thank the captains, officers, crew, support staff and scientists who participated in research cruises that provided data for this study.…”

Section: Acknowledgementmentioning

confidence: 99%

Neogene to Quaternary stratigraphic evolution of the Antarctic Peninsula, Pacific Margin offshore of Adelaide Island: Transitions from a non-glacial, through glacially-influenced to a fully glacial state

Hernández-Molina

Larter

Maldonado

2017

Global and Planetary Change

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“…Our study is based on multichannel seismic datasets that were collected by Germany, the UK, Norway and Spain between 1984 and 2002 and which are archived in the Antarctic Seismic Data Library System (SDLS; Wardell et al, 2007). In total, up to 250 seismic lines are incorporated in this study (Fig.…”

Section: Seismic Datasetmentioning

confidence: 99%

Variability in Cenozoic sedimentation and paleo-water depths of the Weddell Sea basin related to pre-glacial and glacial conditions of Antarctica

Huang

Gohl

Jokat

2014

Global and Planetary Change

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The Weddell Sea basin is of particular significance for understanding climate processes, including the generation of ocean water masses and their influence on ocean circulation as well as the dynamics of the Antarctic ice sheets. The sedimentary record, preserved below the basin floor, serves as an archive of the pre-glacial to glacial development of these processes, which were accompanied by tectonic processes in its early glacial phase. Three multichannel seismic reflection transects, in total nearly 5000 km long, are used to interpret horizons and define a seismostratigraphic model for the basin. We expand this initial stratigraphic model to the greater Weddell Sea region through a network of more than 200 additional seismic lines. Information from few boreholes is used to constrain sediment ages in this stratigraphy, supported by magnetic anomalies indicating decreasing oceanic basement ages from southeast to northwest. Using these constraints, we calculate grids to depict the depths, thicknesses and sedimentation rates of pre-glacial (145-34 Ma), transitional (34-15 Ma) and full-glacial (15 Ma to present) units. These grids allow us to compare the sedimentary regimes of the pre-glacially dominated and glacially dominated stages of Weddell Sea history. The pre-glacial deposition with thicknesses of up to 5 km was controlled by the tectonic evolution and sea-floor spreading history interacting with terrigenous sediment supply. The transitional unit shows a relatively high sedimentation rate and has thicknesses of up to 3 km, which may attribute to an early formation of the East Antarctic Ice Sheet, which was partly advanced to the coast or even inner shelf. The main deposition center of the full-glacial unit lies in front of the Filchner-Ronne Ice Shelf and has sedimentation rates of up to 140-200 m/Myr, which infers that ice sheets grounded on the middle to the outer shelf and that bottom-water currents strongly impacted the sedimentation. We further calculate paleobathymetric grids at 15 Ma, 34 Ma, and 120 Ma by using a backstripping technique. Our results provide constraints for an improved understanding of the paleo-ice sheet dynamics and paleoclimate conditions of the Weddell Sea region.

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“…With new technology the acquisition of seismic data over land-fast sea ice and ice shelves is becoming more efficient and reliable, and multichannel seismic reflection data more readily accessible (Wardell et al, 2007). With new drilling core and seismic surveys, the age and lithology for prominent regional reflectors and units are now better constrained.…”

Section: Understanding the Changing Planet: The Paleoclimate Viewmentioning

confidence: 99%

Summary and highlights of the 10th International Symposium on Antarctic Earth Sciences

Wilson¹,

Bell²,

Fitzgerald³

et al. 2007

Open-File Report

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Untitled

Cited by 6 publications

References 39 publications

Neogene to Quaternary stratigraphic evolution of the Antarctic Peninsula, Pacific Margin offshore of Adelaide Island: Transitions from a non-glacial, through glacially-influenced to a fully glacial state

Neogene to Quaternary stratigraphic evolution of the Antarctic Peninsula, Pacific Margin offshore of Adelaide Island: Transitions from a non-glacial, through glacially-influenced to a fully glacial state

Variability in Cenozoic sedimentation and paleo-water depths of the Weddell Sea basin related to pre-glacial and glacial conditions of Antarctica

Summary and highlights of the 10th International Symposium on Antarctic Earth Sciences

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