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Dynamic Holocene glacial history of St. Jonsfjorden, Svalbard.
- Source :
-
Boreas . Jul2017, Vol. 46 Issue 3, p585-603. 19p. - Publication Year :
- 2017
-
Abstract
- Evidence of a dynamic Holocene glacial history is preserved in the terrestrial and marine archives of St. Jonsfjorden, a small fjord-system on the west coast of Spitsbergen, Svalbard. High-resolution, remotely sensed imagery from marine and terrestrial environments was used to construct geomorphological maps that highlight an intricate glacial history of the entire fjord-system. The geomorphology and stratigraphy indicate an early Holocene local glacier advance constrained to the Lateglacial-early Holocene transition. Identification and 14C dating of the thermophilous bivalve mollusc Modiolus modiolus to 10.0±0.12 cal. ka BP suggest a rapid northward migration of the species shortly after deglaciation. Further evidence enhances the understanding of the onset and subsequent climax of the Neoglacial-Little Ice Age in inner St. Jonsfjorden. The present-day terminus of Osbornebreen, the dominating glacier system in St. Jonsfjorden, is located over 8.5 km up-fjord from its Neoglacial maximum extent. Cross-cutting relationships suggest subsequent advances of all the smaller glaciers in the area following the break-up of Osbornebreen. Glacial deposits, landforms and their cross-cutting relationships observed in both terrestrial and marine settings imply a complex and highly dynamic environment through the later part of the Holocene. [ABSTRACT FROM AUTHOR]
- Subjects :
- *GLACIAL climates
*HOLOCENE Epoch
*GEOMORPHOLOGY
*REMOTE sensing
Subjects
Details
- Language :
- English
- ISSN :
- 03009483
- Volume :
- 46
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Boreas
- Publication Type :
- Academic Journal
- Accession number :
- 123794004
- Full Text :
- https://doi.org/10.1111/bor.12269