Climatic change in Central Asia during MIS 3/2: a case study using biological responses from Lake Baikal

Swann, George E. A.; Mackay, Anson W.; Leng, Melanie J.; Demory, François

doi:10.1016/j.gloplacha.2004.09.019

Cited by 51 publications

(20 citation statements)

References 69 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Continent Ridge represents a site of continuous sedimentation connected, but morphologically isolated, from the Academician Ridge (which has itself been analysed for BSi over the last 5 Ma BP (Williams et al 1997)). Age models for core CON01-603-5 are based on palaeomagnetism and radiocarbon dating (see Swann et al 2005). Core integrity has been confirmed by reflection seismic survey data and side scan sonar data (Charlet et al 2005).…”

Section: Methodsmentioning

confidence: 95%

“…A notable feature of the Continent Ridge record is the lack of an increase in BSi from c. 0.9-1.5 wt.% as SiO2 during the interval from c. 53.3-51.5 kyr BP when diatom concentrations increase to 3.026 x 10 cooling and expansion of ice-cover/thickness, linked to the occurrence of Heinrich event 5 (see Swann et al 2005). In contrasts, the BSi record does not display or indicate the presence of any of these these millennial-scale changes.…”

Section: Discussionmentioning

confidence: 99%

“…Slides for diatom analysis were prepared following methods outlined in Swann et al (2005). A minimum of 100 diatom valves (or six transects) were counted per slide with diatoms being further assigned into three dissolution stages to create a Diatom Dissolution Index (DDI) (Flower and Likhoshway 1993).…”

Section: Methodsmentioning

confidence: 99%

“…Where required, biovolumes for other taxa were calculated following Hillebrand et al (1999) and Rioual and Mackay (2005). 2), reflecting a warm interval terminated by Heinrich event 5 (Swann et al 2005). Diatom biovolumes exhibit similar trends to those in the diatom concentration record with values from c. 53.3-51.5 kyr BP also significantly higher at c. 11,000 μm 3 /g dry wt.…”

Section: Methodsmentioning

confidence: 99%

“…1), in a region unaffected by turbidites (Charlet et al 2005). While Heinrich events have previously been detected at this site in Lake Baikal during MIS 3 using diatom concentrations (Swann et al 2005), no assessment has yet been made on the reliability of BSi measurements in detecting abrupt glacial climatic events at these slow accumulating sites where the influence of turbidites is minimal.…”

mentioning

confidence: 88%

See 4 more Smart Citations

Potential limitations of biogenic silica as an indicator of abrupt climate change in Lake Baikal, Russia

Swann

Mackay

2006

J Paleolimnol

Self Cite

View full text Add to dashboard Cite

Biogenic Silica (BSi) has been one of the most important proxies for determining the palaeoclimate from Lake Baikal over glacial-interglacial cycles. Concentrations (calculated through a 1% Na2CO3 wet-alkaline digestion) at a site in the north basin, however, reveal consistently low values during MIS 3 compared to greater than tenfold changes in diatom concentrations and biovolumes from c. 53.3-51.5 kyr BP. With similar glacial trends present at other low sedimentation sites, we suggest that significant amounts of BSi are removed from diatoms during glacials due to a relative increase in diatom dissolution at the sediment-water interface. This contrasts with existing results from other, higher sedimentation, sites such as those within the Selenga Delta which display a strong relationship between diatoms and BSi. Site selection is therefore essential when searching for Heinrich and other glacial millennial-scale events in Lake Baikal, and we recommend that both BSi and diatom concentrations be calculated together in future studies.

show abstract

Section: Methodsmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 88%

See 3 more Smart Citations

Potential limitations of biogenic silica as an indicator of abrupt climate change in Lake Baikal, Russia

Swann

Mackay

2006

J Paleolimnol

Self Cite

View full text Add to dashboard Cite

show abstract

Quantifying offshore fore‐arc deformation and splay‐fault slip using drowned Pleistocene shorelines, Arauco Bay, Chile

et al. 2017

View full text Add to dashboard Cite

Most of the deformation associated with the seismic cycle in subduction zones occurs offshore and has been therefore difficult to quantify with direct observations at millennial timescales. Here we study millennial deformation associated with an active splay‐fault system in the Arauco Bay area off south central Chile. We describe hitherto unrecognized drowned shorelines using high‐resolution multibeam bathymetry, geomorphic, sedimentologic, and paleontologic observations and quantify uplift rates using a Landscape Evolution Model. Along a margin‐normal profile, uplift rates are 1.3 m/ka near the edge of the continental shelf, 1.5 m/ka at the emerged Santa María Island, −0.1 m/ka at the center of the Arauco Bay, and 0.3 m/ka in the mainland. The bathymetry images a complex pattern of folds and faults representing the surface expression of the crustal‐scale Santa María splay‐fault system. We modeled surface deformation using two different structural scenarios: deep‐reaching normal faults and deep‐reaching reverse faults with shallow extensional structures. Our preferred model comprises a blind reverse fault extending from 3 km depth down to the plate interface at 16 km that slips at a rate between 3.0 and 3.7 m/ka. If all the splay‐fault slip occurs during every great megathrust earthquake, with a recurrence of ~150–200 years, the fault would slip ~0.5 m per event, equivalent to a magnitude ~6.4 earthquake. However, if the splay‐fault slips only with a megathrust earthquake every ~1000 years, the fault would slip ~3.7 m per event, equivalent to a magnitude ~7.5 earthquake.

show abstract

Denisovans, Neanderthals, and Early Modern Humans: A Review of the Pleistocene Hominin Fossils from the Altai Mountains (Southern Siberia)

et al. 2021

View full text Add to dashboard Cite

Climatic change in Central Asia during MIS 3/2: a case study using biological responses from Lake Baikal

Cited by 51 publications

References 69 publications

Potential limitations of biogenic silica as an indicator of abrupt climate change in Lake Baikal, Russia

Potential limitations of biogenic silica as an indicator of abrupt climate change in Lake Baikal, Russia

Quantifying offshore fore‐arc deformation and splay‐fault slip using drowned Pleistocene shorelines, Arauco Bay, Chile

Denisovans, Neanderthals, and Early Modern Humans: A Review of the Pleistocene Hominin Fossils from the Altai Mountains (Southern Siberia)

Contact Info

Product

Resources

About