Postglazialer Anstieg des Meeresspiegels, Paläoklima und Hydrographie, aufgezeichnet in Sedimenten der Bermuda inshore waters

Vollbrecht, Rüdiger Dr.

dc.contributor.advisor	Meischner, Dieter Prof. Dr.	de
dc.contributor.author	Vollbrecht, Rüdiger Dr.	de
dc.date.accessioned	2000-10-26T15:25:54Z	de
dc.date.accessioned	2013-01-18T11:26:25Z	de
dc.date.available	2013-01-30T23:50:14Z	de
dc.date.issued	2000-10-26	de
dc.identifier.uri	http://hdl.handle.net/11858/00-1735-0000-0006-B35B-4	de
dc.identifier.uri	http://dx.doi.org/10.53846/goediss-2371
dc.format.mimetype	ContentType:application/pdf Size:38.197	de
dc.language.iso	ger	de
dc.rights.uri	http://webdoc.sub.gwdg.de/diss/copyrdiss.htm	de
dc.title	Postglazialer Anstieg des Meeresspiegels, Paläoklima und Hydrographie, aufgezeichnet in Sedimenten der Bermuda inshore waters	de
dc.type	habilitation	de
dc.title.translated	Postglacial rise of sea level, palaeoclimate and hydrography, recorded in sediments of the Bermuda inshore waters	de
dc.contributor.referee	Hoefs, Jochen Prof. Dr.	de
dc.date.examination	1997-01-13	de
dc.subject.dnb	550 Geowissenschaften	de
dc.description.abstracteng	The principal aim of this study was to clarify the sedimentary history of the Bermuda inshore waters during postglacial time. From this, clues to the deglacial history of regional sea-level and palaeoclimate were expected.Fourty-six kilometres of UNIBOOM seismic profiles and 53 sediment cores were studied from various locations in the major inshore waters: Castle Harbour, Great Sound, Harrington Sound, Port Royal Bay, St. George's Harbour. Of these, Harrington Sound was studied most intensely.Aside from core description techniques, the following methods were employed: X-ray radiography, warve counting, optical and scanning electron microscopy, coarse fraction analysis, micropalaeontological techniques, X-ray diffraction, geochemical techniques (bulk carbonate, CHN-analyses, GC-MS, stable oxygen and carbon isotopes), and radiocarbon dating (conventional, AMS).The Holocene sedimentary succession in Harrington Sound comprises 15 limnic, brackish, and marine facies. Above the Pleistocene soil or carbonates, a basal Holocene peat is usually developed. This basal peat accumulated in freshwater marshes very close to the ambient sea-level. Radiocarbon age-depth data on peat from various elevations give a measure of deglacial sea-level rise during the last 10,400 14C-years BP (~12,500 sidereal years BP). Comparison with another glacioeustatic sea-level curve, i.e. that of Barbados, reveals significant differences the reasons of which are still under discussion. Previously unrecognized sources of error include: (1) tectonic-isostatic movements during global deglaciation (possible for both settings, but more probable for Barbados), and (2) downslope transport of Acropora palmata debris (Barbados).During the last 10,400 14C-years BP, sea level rose from below -35 m to present datum. In response to this, the formerly subaerial inshore basins became flooded, at first by fresh water lenses buoyant at sea level. In the deep depressions of Harrington Sound, the Holocene limnic succession starts with peat and intervening lacustrine chalk. This reflects a freshwater marsh, with small ponds, established in response to the rising sea level. Deposition of lake marl commenced throughout much of the Harrington Sound lake when the continuously rising lake level flooded former marsh floors. Continued rise of sea level led to encroachment of marine pore water through the karstified bottom of Harrington Sound, establishing meromictic conditions in the deeps and brackish conditions in the shallows by about 8.000 yr BP. Limnic mollusc and ostracod species became quickly replaced by euryhaline ones. About 1,5 kyr later, holomixis resumed throughout the basin, and restricted marine conditions were established.The last major environmental change took place a few hundreds of years ago when, possibly in historic time already, Harrington Sound acquired a surficial connection to the adjacent lagoon. In response to the improved water exchange, a different suite of marine fauna including the branching coral Oculina entered the basin and started to re-shape the inshore-water bottom. On principle, each of the inshore basins ran through the same history of emersion, flooding, ingression of sea-water, and deepening. Modifications to the general scheme resulted from differences in: (1) the degree of isolation from the surrounding ocean, (2) antecedent topography, (3) hydrography, (4) erosion, (5) autotrophic communities, and (6) reef communities.	de
dc.contributor.coReferee	Meischner, Dieter Prof. Dr.	de
dc.contributor.thirdReferee	Riegel, Walter Prof. Dr.	de
dc.subject.topic	Mathematics and Computer Science	de
dc.subject.ger	Postglazial	de
dc.subject.ger	Meeresspiegel	de
dc.subject.ger	Paläoklima	de
dc.subject.ger	Hydrography	de
dc.subject.ger	Bermuda	de
dc.subject.ger	Sedimente	de
dc.subject.ger	Pleistozän	de
dc.subject.ger	Holozän	de
dc.subject.ger	Quartär	de
dc.subject.ger	Seen	de
dc.subject.ger	Küste	de
dc.subject.ger	Laminite	de
dc.subject.ger	Solarzyklen	de
dc.subject.ger	Sonnenzyklen	de
dc.subject.ger	marin	de
dc.subject.ger	lakustrin	de
dc.subject.ger	Geologie	de
dc.subject.ger	Karbonate	de
dc.subject.ger	Böden	de
dc.subject.ger	Karst	de
dc.subject.ger	Torf	de
dc.subject.ger	Isotopen-Geochemie	de
dc.subject.ger	Altersbestimmung	de
dc.subject.ger	Fazies	de
dc.subject.ger	Paläökologie	de
dc.subject.eng	postglacial	de
dc.subject.eng	sea level	de
dc.subject.eng	palaeoclimate	de
dc.subject.eng	paleoclimate	de
dc.subject.eng	hydrography	de
dc.subject.eng	Bermuda	de
dc.subject.eng	sediments	de
dc.subject.eng	Pleistocene	de
dc.subject.eng	Holocene	de
dc.subject.eng	Quaternary	de
dc.subject.eng	inshore waters	de
dc.subject.eng	lakes	de
dc.subject.eng	laminites	de
dc.subject.eng	solar cycles	de
dc.subject.eng	lacustrine	de
dc.subject.eng	marine	de
dc.subject.eng	geology	de
dc.subject.eng	carbonates	de
dc.subject.eng	soil	de
dc.subject.eng	karst	de
dc.subject.eng	peat	de
dc.subject.eng	isotope geochemistry	de
dc.subject.eng	radiocarbon dating	de
dc.subject.eng	facies	de
dc.subject.eng	palaeoecology	de
dc.subject.eng	paleoecology	de
dc.subject.bk	38.48 Marine Geologie	de
dc.subject.bk	38.41 Sedimentation	de
dc.subject.bk	38.82 Klimatologie	de
dc.subject.bk	38.19 Historische Geologie: Sonstiges	de
dc.subject.bk	38.32 Geochemie	de
dc.subject.bk	38.88 Regionale Hydrologie	de
dc.subject.bk	38.47 Moore	de
dc.subject.bk	38.90 Ozeanologie	de
dc.subject.bk	Ozeanographie	de
dc.identifier.urn	urn:nbn:de:gbv:7-webdoc-950-7	de
dc.identifier.purl	webdoc-950	de
dc.affiliation.institute	Fakultät für Geowissenschaften und Geographie	de
dc.subject.gokfull	VAT 110 Küstendynamik und Küstenmorphologie einzelner Regionen	de
dc.subject.gokfull	VAT 250 Litorale Sedimente	de
dc.subject.gokfull	VCA 520 Quartärgeologie	de
dc.subject.gokfull	VDI 210 Pleistozän	de
dc.subject.gokfull	VDI 220 Holozän	de
dc.subject.gokfull	VEW 200 Karibischer Raum	de
dc.subject.gokfull	VEZ 130 Inselgruppen	de
dc.subject.gokfull	TWC 600 Paläoklimatologie	de
dc.subject.gokfull	TWC 500 Klimaschwankungen und Klimaänderungen im Quartär	de
dc.subject.gokfull	VKB 380 Sedimente bestimmter Regionen	de
dc.subject.gokfull	VKB 378 Rhytmite	de
dc.subject.gokfull	VKB 376 Organogene Sedimentgesteine	de
dc.subject.gokfull	VKB 340 Fazieskunde	de
dc.subject.gokfull	VKB 333 Sonstige Sedimentationsprozesse	de
dc.subject.gokfull	VKB 332 Sedimentationsbedingungen	de
dc.subject.gokfull	UHA 700 Marine Geologie (Küsten	de
dc.subject.gokfull	Watt	de
dc.subject.gokfull	Inselbildung etc.)	de
dc.subject.gokfull	UHA 440 Schwankungen	de
dc.identifier.ppn	487198247	de

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