Sidney R. Hemming
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View article: Reconstructing Eocene Antarctic river drainage from provenance analysis of Amundsen Sea embayment sediments
Reconstructing Eocene Antarctic river drainage from provenance analysis of Amundsen Sea embayment sediments Open
Sedimentary records can illuminate relationships between the climate, topography, and glaciation of West Antarctica by revealing its Cenozoic topographic and paleoenvironmental history. Eocene fluvial drainage patterns have previously been…
View article: Reconstructing Eocene Antarctic river drainage from provenance analysis of Amundsen Sea embayment sediments
Reconstructing Eocene Antarctic river drainage from provenance analysis of Amundsen Sea embayment sediments Open
Sedimentary records can illuminate relationships between the climate, topography, and glaciation of West Antarctica by revealing its Cenozoic topographic and paleoenvironmental history. Eocene fluvial drainage patterns have previously been…
View article: Authigenic Uranium Preservation and Bottom Water Oxygenation in the Scotia Sea
Authigenic Uranium Preservation and Bottom Water Oxygenation in the Scotia Sea Open
Sedimentary uranium (U) and thorium (Th) isotopes are invaluable proxies to assess bottom water redox conditions, site‐specific sediment focusing and vertical rain rates. We investigate if authigenic uranium (aU) can serve as a proxy for b…
View article: Evidence from IODP Site U1537 in the Dove Basin, Scotia Sea for a warmer Antarctica during the early Pleistocene (2.4-2.1 Ma) 
Evidence from IODP Site U1537 in the Dove Basin, Scotia Sea for a warmer Antarctica during the early Pleistocene (2.4-2.1 Ma)  Open
IODP Site U1537 is located in a contourite deposit in the Dove Basin of the southeastern Scotia Sea, in 3,713 meters of water. It consists of alternating diatom oozes and silty clays, with variable amounts of sand to gravel-sized clasts de…
View article: Rock magnetic proxies to infer terrigenous provenance variation on Björn Drift IODP Site U1554, preliminary results.
Rock magnetic proxies to infer terrigenous provenance variation on Björn Drift IODP Site U1554, preliminary results. Open
Reconstructing the North Atlantic Deep Water (NADW) formation and strength over time is fundamental to understanding North Atlantic and global ocean circulation and climate evolution. A multi-proxy approach on sedimentary core records can …
View article: Site U1554
Site U1554 Open
International audience
View article: Site U1602
Site U1602 Open
International audience
View article: Site U1555
Site U1555 Open
International audience
View article: Site U1562
Site U1562 Open
International audience
View article: Expedition 395 summary
Expedition 395 summary Open
The intersection between the Mid-Atlantic Ridge and Iceland hotspot provides a natural laboratory where the composition and dynamics of Earth's upper mantle can be observed. Plume-ridge interaction drives variations in the melting regime, …
View article: Expedition 395 methods
Expedition 395 methods Open
International audience
View article: Site U1564
Site U1564 Open
International audience
View article: Site U1563
Site U1563 Open
International audience
Shifting Antarctic Circumpolar Current south of Africa over the past 1.9 million years Open
The Antarctic Circumpolar Current (ACC) dominates the transfer of heat, salt, and tracers around the Southern Ocean (SO), driving the upwelling of carbon-rich deep waters around Antarctica. Paleoclimate reconstructions reveal marked variab…
Revisiting the mid-Pleistocene transition ocean circulation crisis Open
The mid-Pleistocene transition (MPT) [~1.25 to 0.85 million years ago (Ma)] marks a shift in the character of glacial-interglacial climate ( 1 , 2 ). One prevailing hypothesis for the origin of the MPT is that glacial deep ocean circulatio…
View article: U and Th zonation in apatite observed by synchrotron X-ray fluorescence tomography and implications for the (U–Th) ∕ He system
U and Th zonation in apatite observed by synchrotron X-ray fluorescence tomography and implications for the (U–Th) ∕ He system Open
Synchrotron X-ray fluorescence microtomography can non-destructively image the three-dimensional distribution of several trace elements in whole apatite crystals at the resolution of 1 µm3. This allows for precise determination of the phys…
Volcanic activity around Taipei, Taiwan: new data and perspectives on the Tatun Volcano Group Open
The Tatun Volcano Group (TVG) is located at the northern end of Taiwan, ~ 15 km from the center of Taipei, a metropolitan area of over seven million inhabitants. A volcanic eruption by the TVG of any type or scale could cause catastrophic …
View article: A 3.3‐Million‐Year Record of Antarctic Iceberg Rafted Debris and Ice Sheet Evolution Quantified by Machine Learning
A 3.3‐Million‐Year Record of Antarctic Iceberg Rafted Debris and Ice Sheet Evolution Quantified by Machine Learning Open
Over the last 3.3 million years, the Antarctic Ice Sheet (AIS) has undergone phases of ice sheet growth and decay, impacting sea level and climate globally. Presently, the largely marine‐terminating AIS loses mass primarily by iceberg calv…
Increased Grounding Zone Ice Flux and Dynamic Thinning Creates Vulnerable Regions on George VI Ice Shelf, Antarctic Peninsula Open
George VI Ice Shelf (GVIIS), on the western side of the Antarctic Peninsula, is currently losing mass. Paleo observations suggest that atmospheric and oceanic warming in the early Holocene caused complete loss of the ice shelf, leading to …
View article: A Geochemical Mechanism for >10 m Apparent Downward Offsets of Magnetic Reversals Inferred From Comparison of Two Scotia Sea Drill Sites
A Geochemical Mechanism for >10 m Apparent Downward Offsets of Magnetic Reversals Inferred From Comparison of Two Scotia Sea Drill Sites Open
We document an apparent downward displacement of the Matuyama‐Brunhes magnetic reversal by ∼20 m at Scotia Sea International Ocean Discovery Program Site U1538 (Pirie Basin) by comparison with the well‐defined paleomagnetic record at nearb…
Green bands as markers of deep ocean ventilation in marine sediments Open
Ocean ventilation of "young" surface waters, which have recently been in contact with the atmosphere, in the high-latitude North Atlantic Ocean, serves as a major source of oxygen-rich deep waters (> 2.5 km) to the world's oceans 1,2 . Bot…
Pliocene subsurface fluid flow driven by rapid erosional exhumation of the Colorado Plateau, southwestern USA Open
Erosion may modify the architecture of subsurface flow systems by removing confining units and changing topography to influence patterns of fluid circulation or by inducing gas exsolution from subsurface fluids, influencing compositional a…
View article: Multimethod dating of ice-rafted dropstones reveals hidden localized glacial erosion in Wilkes Subglacial Basin, Antarctica
Multimethod dating of ice-rafted dropstones reveals hidden localized glacial erosion in Wilkes Subglacial Basin, Antarctica Open
The Antarctic ice sheet blankets >99% of the continent and limits our ability to study how subglacial geology and topography have evolved through time. Ice-rafted dropstones derived from the Antarctic subglacial continental interior at dif…
View article: Byrd Ice Core Debris Constrains the Sediment Provenance Signature of Central West Antarctica
Byrd Ice Core Debris Constrains the Sediment Provenance Signature of Central West Antarctica Open
Provenance records from sediments deposited offshore of the West Antarctic Ice Sheet (WAIS) can help identify past major ice retreat, thus constraining ice‐sheet models projecting future sea‐level rise. Interpretations from such records ar…
View article: U and Th zonation in apatite observed by synchrotron X–ray fluorescence tomography and implications for the (U–Th)/He system
U and Th zonation in apatite observed by synchrotron X–ray fluorescence tomography and implications for the (U–Th)/He system Open
Synchrotron X–ray fluorescence microtomography can non-destructively image the three-dimensional distribution of several trace elements in whole apatite crystals at the scale of one µm3. This allows for precise determination of the physica…