ChapterPDF Available

Современное состояние четвертичных отложений океанов. Recent condition of the stratigraphy of the Quaternary ocean deposits.

March 1989

In book: Четвертичный период.Стратиграфия. XXVIII сес. Межд.Геол. Конгр. Quaternary Period. Stratigraphy. XXVIII ses. Int. Geol. Congr. (pp.168-176)
Edition: 1
Chapter: 24
Publisher: Наука
Editors: М.Н. Алексеев, Кв. Никифорова

Project: The stratigraphy of Quaternary ocean sediments and paleoceanology

Authors:

Max Semenovich Barash

P.P. Shirshov Institute of Oceanology

The paper discusses possibilities and limitations of basic recent stratigraphic methods applied for Quaternary oceanic sediments: paleomagnetic, climatostratigraphic (oxygen-isotope, micropaleontological - "paleoclimatic" and paleotemperature methods) and biostratigraphic ones. Precision of stratigraphic estimations depends on sediments age: from hundreds of thousands of years for Eopleistocene to the first thousands and hundreds of years for the Holocene. Application of any single method may produce errors. To achieve higher temporal resolution, further studies of natural processes and integrated application of different methods are required.

Content uploaded by Max Semenovich Barash

Content may be subject to copyright.

ABSTRACT

ResearchGate has not been able to resolve any citations for this publication.

ResearchGate has not been able to resolve any references for this publication.

Project

Influence of abiotic factors on the evolution of marine biota during the Phanerozoic

Max Semenovich Barash

Project

The stratigraphy of Quaternary ocean sediments and paleoceanology

Biostratigraphic subdivision and definition of the Quaternary age of ocean and marine sediments using micropaleontological and other methods. Reconstruction of paleo environment conditions (paleote mperatures, currents, hydrological fronts, distribution of ice, etc..). Correlation. Paleoclimatic reconstructions. Extrapolation of methods to earlier stratigraphic intervals and the corresponding constructions. ... [more]

Project

Stratigraphy of Tertiary deposits, paleooceanology, the formation of manganese and phosphorite nodules

Research of Tertiary sediments of the oceans and seas, their stratigraphy, reconstruction of paleooceanological conditions. The study of the processes of manganese and phosphorite nodules formation

Project

Marine Geology

Max Semenovich Barash

Article

Full-text available

Geomorphological investigations of sediment traps on Lanzarote (Canary Islands) as a key for the int...

March 2009 · Quaternary International

On Lanzarote (Canary Islands) Late Quaternary Saharan dust and volcanic material were trapped in Miocence to Pliocene valleys dammed by volcanic lava flows. These trapped sediments are potentially interesting as they can be natural archives useful to reconstruct the terrestrial palaeoclimate history of the NW African margin. Nevertheless, slope wash processes altered the primarily eolian ... [Show full abstract] deposits, making climatic interpretation not straightforward. Geomorphological mapping, GIS calculations and sedimentological investigations were used to unravel these processes influencing the temporal resolution of the palaeoclimatic archive, demonstrating that they average the palaeoclimatic signal by some ka. Thus, despite the colluvial geomorphic environment, the valley fillings can be used for palaeoclimatic interpretation of events with a length of at least some ka. The youngest sediments, deposited since at least 2.5 ka, are anthropogenically triggered and thus cannot be used for palaeoclimatic interpretation. The results show that the input of Saharan dust at Lanzarote increased during the last 1.0 Ma and especially during the Early/Middle Holocene.

Article

Sub-Milankovitch variability in the terrigenous sediment input to the southern Chilean continental m...

F. Lamy

Sediments recovered at Ocean Drilling Project (ODP) Site 1233 (drilled during Leg 202 at the southern Chilean continental margin) provide an outstanding potential for unprecedented ultra high resolution reconstructions of surface and deep ocean conditions as well as continental paleoclimates during the last glacial/interglacial cycle. Shipboard biostratigraphic data indicate that the base of Site ... [Show full abstract] 1233 is younger than 260 ka. Paleomagnetic evidence (suggesting that the prominent "Laschamp" excursion, ca. 41 ka, is located at a core depth of 67-69 mcd) and detailed correlations to the Holocene record of a 14C-AMS dated gravity core from the same site imply sedimentation rates of 1 to 1.5 m/ka at least for marine isotopes stages 1-3. The stratigraphy is currently being improved by 14C AMS dating, oxygen isotope, and further paleomagnetic analyses. Here we present records of terrigenous sediment input based on magnetic susceptibility and elemental composition data both measured with 1 cm spacing (~decadal resolution), which were obtained with the Bremen XRF and MSCL Core Scanner. The lithologically homogeneous fine-grained terrigenous sediments at Site 1233 are characterised by extremely high Fe and Ti contents consistent with high magnetic susceptibilities. Superimposed on "long-term" trends on orbital time-scales, a pronounced sub-Milankovitch variability can be observed in all data-sets. Based on our previous research on shorter gravity cores in the region, we expect that these changes in the terrigenous input record rainfall variability in southern Chile directly related to latitudinal shifts and/or changes in the strength of the Southern Westerlies. As soon as the stratigraphy has been improved, a detailed analysis of this short-term variability will be performed. We expect to provide important results on millennial to centennial changes in the Southern Hemisphere midlatitudes which will significantly contribute to the ongoing discussion on timing and phase relationships of interhemispheric climate change on sub Milankovitch time scales.

Article

A paleoclimatic evaluation of marine oxygen isotope stage 11 in the high-northern Atlantic (Nordic S...

February 2000 · Global and Planetary Change

A sediment core from the high latitude of the Northern Atlantic (Nordic seas) was intensively studied by means of biogeochemical, sedimentological, and micropaleontological methods. The proxy records of interglacial marine oxygen isotope stage (MIS) 11 are directly compared with records from the Holocene (MIS 1), revealing that many features of MIS 11 are rather atypical for an interglaciation at ... [Show full abstract] these latitudes.Full-interglacial conditions without deposition of ice-rafted debris existed in MIS 11 for about 10 kyr (∼398–408 ka). This time is marked by the lightest d18O values in benthic foraminifera, indicating a small global ice volume, and by the appearance of subpolar planktic foraminifera, indicating a northward advection of Atlantic surface water. A comparison with MIS 1, using the same proxies, implies that surface temperatures were lower and global ice volume was larger during MIS 11. A comparative study of the ratio between planktic and benthic foraminifera also reveals strong differences among the two intervals. These data imply that the coupling between surface and bottom bioproductivity, i.e., the vertical transportation of the amount of fresh organic matter, was different in MIS 11. This is corroborated by a benthic fauna in MIS 11, which contains no epifaunally-living species. Despite comparable values in carbonate content (%), reflectance analyses of the total sediment (greylevel) show much higher values for MIS 11 than for MIS 1. These high values are attributed to increased corrosion of foraminiferal tests, directly affecting the sediment greylevel. The reason for this enhanced carbonate corrosion in MIS 11 remains speculative, but may be linked to the global carbon cycle.

Article

Late Quaternary geomagnetic stratigraphy recorded in Lake Erie sediments

June 1976 · Earth and Planetary Sciences Letters

The palaeomagnetism of Holocene sediments from central Lake Erie is documented by measurements of inclination, declination, intensity, susceptibility and saturation remanence. Several complete oscillations in declination are recorded as in the postglacial sediments of Lake Michigan. These oscillations should prove useful as regional time-stratigraphic markers from core to core. They may also ... [Show full abstract] represent equal intervals of time, although chronologic control is insufficient to either prove or disprove the inference. Late Wisconsinan sediments from our two longest cores (lengths 18 m and 27 m) recorded a geomagnetic excursion, named the Erieau Excursion, which extends from about 14,000 yr B.P. into the earliest postglacial sediments.