Lithostratigraphy and paleoceanography in the Chukchi Rise of the western Arctic Ocean since the last glacial period

Park, Kwangkyu; Ohkushi, Ken’ichi; Cho, Hyen Goo; Khim, Boo‐Keun

doi:10.1016/j.polar.2017.01.002

Cited by 12 publications

(51 citation statements)

References 60 publications

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“…Because these source areas have different rocks and tectonics, it is easy to identify their provenance through mineralogy and radiogenic isotopes. for comparison in the present study (PC04, [21]; 03M03, [23]) in the western Arctic. The circulation paths (arrow) are modified [14,17].…”

Section: Introductionmentioning

confidence: 65%

“…In particular, clay mineralogy and geochemistry have been utilized as powerful tools with which to trace the provenance of terrigenous portions of marine sediments. Several provenance studies have been performed in the Arctic Ocean, using clay mineralogy [19][20][21], bulk mineralogy [8][9][10]22,23], Fe-oxide grains [11,14], and geochemical signals [24,25]. These studies have suggested that the Eurasian and North American continents were the major sediment sources in the western Arctic [8][9][10][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…Several provenance studies have been performed in the Arctic Ocean, using clay mineralogy [19][20][21], bulk mineralogy [8][9][10]22,23], Fe-oxide grains [11,14], and geochemical signals [24,25]. These studies have suggested that the Eurasian and North American continents were the major sediment sources in the western Arctic [8][9][10][21][22][23]. Because these source areas have different rocks and tectonics, it is easy to identify their provenance through mineralogy and radiogenic isotopes.…”

Section: Introductionmentioning

confidence: 99%

“…Distribution of various terrigenous components in the Arctic sediment records conveys information on sediment sources and depositional environments and thus paleocirculation and changes in paleoclimate conditions, such as connection to other oceans and [21]; 03M03, [23]) in the western Arctic. The circulation paths (arrow) are modified [14,17].…”

Section: Introductionmentioning

confidence: 99%

“…The Chukchi Rise to Chukchi Basin areas are a sensitive region not only for oceanic currents such as Beaufort Gyre and coastal currents but also for the development of ice sheets, and thus these areas can provide useful records for understanding the evolution of ice and current patterns. However, previous studies in this area have mainly focused on the sedimentation patterns and marine environment [9,21,23,27] and have not dealt with detailed sediment provenance changes. Furthermore, the sediment cores in the Chukchi Basin have limited records during the MIS 2 due to low sedimentation rate [9,23,27].…”

Section: Introductionmentioning

confidence: 99%

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Change in Sediment Provenance on the Inner Slope of the Chukchi Rise and Their Paleoenvironmental Implications

2021

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The Arctic Ocean is one of the world’s most remarkable regions with respect to global climate change. The core ARA09C-St03 was analyzed for mineral composition and Nd isotope to determine the sediment provenance and reconstruct the paleoenvironment in the inner slope of the Chukchi Rise. Core ARA09C-St03 represents overall cycles of brown and gray color with three distinct dark brown layers and two pinkish-white layers and is divided into eight sedimentary units based on the lithological feature. The core has a continuous record of the late marine isotope stage (MIS) 5 to the Holocene and in particular provides a particularly high-resolution record from the Last Glacial Maximum (LGM). Sediment is derived mainly from the adjacent East Siberian Sea and the North American region, and changes in sediment provenance are controlled by climate-dependent particle size. During the glacial/stadial periods, sediments in Units 3, 5, and 8 were supplied by the East Siberian Sea via meltwater-derived suspension. The major ice-rafted debris (IRD) events in Units 2, 4, and 7, characterized by abundant dolomite and K/C ratio, were sourced from North America. The North America-derived materials reflect the initiation and disintegration of the Laurentide Ice Sheet and icebergs transported them across the open Arctic Ocean. The differences in provenance within these periods may be related to the scale of the Laurentide Ice Sheet. Interglacial sediments, including those from Units 1 and 6, are of mixed origin from Eurasia and the Canadian Archipelago and may have been transported by oceanic current and seasonal sea ice. These periods are likely associated with the negative Arctic Oscillation (AO) intensifying the Beaufort Gyre.

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Section: Introductionmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Change in Sediment Provenance on the Inner Slope of the Chukchi Rise and Their Paleoenvironmental Implications

2021

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Glacial sediments on the outer Chukchi Shelf and Chukchi Borderland in seismic reflection data

2022

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The up to 900 km broad shelves off East Siberia and northwest off Alaska, including the Chukchi Shelf and Borderland, are characterized by shallow water in the periphery of the Arctic Ocean, north of the Bering Strait. Seafloor investigations revealed the widespread presence of glacial bedforms, implying the former existence of grounded ice in this region. We discuss the erosion and deposition around and beneath ice sheets/shelves using a regional grid of 2D seismic reflection data, acquired in 2011 from R/V Marcus G. Langseth across the outer ~ 75 km of the Chukchi Shelf and the adjacent Chukchi Borderland. A high amplitude glacial base (GB) reflection extends over large parts of the shelf, separating glacial from preglacial strata. We define eleven seismic reflection characters, that we use to infer distinct depositional environments of glacial sediments. Thick well stratified sediments overlying the GB reflection in the south may have been impacted by fewer advance-retreat cycles than those near the northeastern and western shelf breaks. Here, the GB reflection pinches out at the seafloor next to reworked and eroded areas. Numerous meltwater channels, some up to several kilometers wide, together with grounding zone wedges and recessional moraines are hints for ice sheets in the Chukchi Region. These ice sheets built up a huge grounding zone wedge of 48 km × 75 km on the Chukchi Rise. More grounding zone wedges on the western sides of bathymetric highs of the Chukchi Borderland along with mega scale glacial lineations indicate later ice shelf advances from east during the late Quaternary. However, in the absence of deep sediment cores, the timing or origin of the ice grounding events cannot be fully reconstructed.

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A Eurasian Basin sedimentary record of glacial impact on the central Arctic Ocean during MIS 1–4

Dong

Polyak

Xiao

et al. 2022

Global and Planetary Change

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Lithostratigraphy and paleoceanography in the Chukchi Rise of the western Arctic Ocean since the last glacial period

Cited by 12 publications

References 60 publications

Change in Sediment Provenance on the Inner Slope of the Chukchi Rise and Their Paleoenvironmental Implications

Change in Sediment Provenance on the Inner Slope of the Chukchi Rise and Their Paleoenvironmental Implications

Glacial sediments on the outer Chukchi Shelf and Chukchi Borderland in seismic reflection data

A Eurasian Basin sedimentary record of glacial impact on the central Arctic Ocean during MIS 1–4

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