Magyar
Toggle navigation
Tudóstér
Magyar
Tudóstér
Keresés
Egyszerű keresés
Összetett keresés
CCL keresés
Egyszerű keresés
Összetett keresés
CCL keresés
Böngészés
Saját polc tartalma
(
0
)
Korábbi keresések
Összesen 1 találat.
#/oldal:
12
36
60
120
Rövid
Hosszú
MARC
Részletezés:
Rendezés:
Szerző növekvő
Szerző csökkenő
Cím növekvő
Cím csökkenő
Dátum növekvő
Dátum csökkenő
1.
001-es BibID:
BIBFORM079873
Első szerző:
Hubay Katalin (biológus, környezetkutató)
Cím:
Age-depth relationship and accumulation rates in four sediment sequences from the Retezat Mts, South Carpathians (Romania) / Hubay Katalin, Molnár Mihály, Orbán Ildikó, Braun Mihály, Bíró Tamás, Magyari Enikő
Dátum:
2018
ISSN:
1040-6182
Megjegyzések:
This study summarizes the results of radiocarbon dating and age-depth modelling in four mountain lakes (Brazi, Gales, Bucura and Lia) in the Retezat Mountains. Altogether 69 AMS 14C measurements were performed on these deposits, mostly on terrestrial plant macrofossils. In several cases, plant macrofossils, aquatic animal remains (Cladoceran eggs) and bulk sediment were measured from the same depth allowing for the comparison of various sediment components in terms of their dating potential. Age-depth models were developed using both Bayesian modelling with the BACON and smooth spline curve fitting with the CLAM software. In this study Bayesian models are applied to identify outlier 14C dates, while smooth spline models are used to model sediment accumulation age-depth relations, as these are more likely to follow natural deposition time changes of lake sediments. Changes in sediment deposition times (DT) in relation to catchment size and climate are also studied. DT varied considerably in the late glacial (LG) part of the records. The sediment sequence characterised by high deposition rates during the late glacial (DT maximum around 100?110 years cm?1) was defined by small catchment size (Lake Brazi, 6 ha; surface area: 0.5 ha). In contrast, much slower LG sediment deposition in the southern slope lake characterised by large catchment area (Lake Lia, 171 ha, 20 years cm?1), principally reflecting strong erosion in these catchment areas at times when vegetation cover was scarce. Holocene was characterised again by variable DT values, but only Lake Gales showed extreme values: 62?110 years between 10,900 and 6050 cal yr BP, followed by much slower sediment deposition in the last 6000 years (av. 29 years cm?1). Generally, sediment deposition times were largely dependent on the stability and vegetation cover of the slope in the case of high altitude deep lakes, while lower altitude, shallow lakes showed slower sediment deposition time in the early and mid-Holocene, when summer insolation was higher than today. This reflects that in these shallow lakes in-lake organic production probably increased with summer insolation, which was a significant driver in the rate of deposition.
Tárgyszavak:
Természettudományok
Környezettudományok
idegen nyelvű folyóiratközlemény külföldi lapban
AMS 14C dating
Glacial lake sediments
Late glacial
Holocene
Carpathians
Megjelenés:
Quaternary International. - 477 (2018), p. 7-18. -
További szerzők:
Molnár Mihály
Orbán Ildikó
Braun Mihály (1966-) (vegyész, analitikus)
Bíró Tamás
Magyari Enikő (1973-) (biológus)
Internet cím:
Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon:
Rekordok letöltése
1
Corvina könyvtári katalógus v8.2.27
© 2023
Monguz kft.
Minden jog fenntartva.