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| Titel |
High-resolution multi-proxy reconstruction of Lake Ighiel (Western
Carpathians, Romania): processes and controlling factors of lacustrine
dynamics during the mid and late Holocene |
| VerfasserIn |
Aritina Haliuc, Daniel Veres, Katalin Hubay, Robert Begy, Achim Brauer, Simon Hutchinson, Mihály Braun |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250126031
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| Publikation (Nr.) |
 EGU/EGU2016-5702.pdf |
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| Zusammenfassung |
| Concerns about current and prospective environmental change have increased the interest in
past climate variability and its impact on the bio-hydro-atmosphere and human society.
Acting as high-resolution terrestrial archives, lacustrine sediments are the result of the
complex interaction between internal and external forcing and an important tool in efforts to
resolve questions related to the palaeoclimatic and palaeoenvironmental conditions of the
recent past.
Here we discuss a new, high-resolution sedimentary record from the Romanian
Carpathians (central-eastern Europe). Lake Ighiel (46˚ 10’50"N, 23˚ 22’00"E) is a small
lake located in a mid-altitude mountain belt (Trascau Mountains) at an altitude of 924 m (
lake maximum depth 9 m; catchment area 487 ha). We employ detailed 210Pb and 14C dating
coupled with high-resolution X-ray fluorescence scanning (μ-XRF) measurements,
long-core sedimentary logging, environmental magnetic proxies (susceptibility,
natural and induced remanences) in an attempt to trace the 6000 years evolution of
lake-catchment system. More specifically, we discuss: i) the temporal evolution of the main
sedimentation phases of the lake based on sedimentological, geochemical and magnetic
proxies; ii) the amplitude and interplay of processes (natural and/or anthropogenic)
controlling the depositional environment through time; iii) assess the contribution of each
controlling factors and reconstruct the evolution of lacustrine system and palaeoclimate
forcing using multivariate statistics. The sedimentary record can be divided into
six phases based on alternating high and low detrital fluxes, oscillating lacustrine
productivity and redox conditions. A series of detrital events (5200; 4800; 5400; 5250;
4500; 4050; 3800; 3500; 3250; 3050; 2650; 2350; 2250; 1400; 1100; 500; 100 cal
yr BP) were identified by microfacies analyses and X-ray fluorescence scanning
(μ-XRF) analysis. These events are reflected in most of the parameters and appear
synchronous with climatically induced forcing such as increased regional precipitation and
decreased total solar radiation. These changes are superimposed on clear anthropogenic
derived contributions reflecting natural and mineral resource exploitation during the
early metal ages, the Roman and Medieval periods, as well as during the recent
period.
The comparison of the our proxies with similarly resolved records from central-eastern
Europe highlight the potential of Lake Ighiel as a record of palaeoclimatic and
palaeohydrological conditions in a region still lacking high-resolution multi-proxy
palaeoenvironmental archives.
The authors acknowledge financial support from project PN-II-ID-PCE-2012-4-0530
“Millennial-scale geochemical records of anthropogenic impact and natural climate change in
the Romanian Carpathians”, contract nr. 15/02.09.2013. |
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