Rift flank segmentation, basin initiation and propagation: a neotectonic example from Lake Baikal

Journal of the Geological Society
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Abstract

New surficial data (field, Landsat TM and topography) define morpho-tectonic domains and rift flank segmentation in the Ol'khon region of the Central Baikal rift. Deformation, drainage and depositional patterns indicate a change in the locus of active extension that may relate to a recent (<l Ma) change in the kinematics of the Siberian plate boundary. The westwards migration of the border fault location has broadened the rift with concomitant shifts in depocentres. Within the hanging wall of the new western border fault, distinct segments control the location of drainage paths and syn-rift deposits. Morphology, sediment thicknesses and fault scarp amplitude indicate that a segmented rift flank graben has propagated southwards along the rift flank and is still actively fragmenting. These surficial data are used to constrain a model for the time-dependent topographic variations during progressive subsidence along a rift flank, involving the transfer of footwall units to hanging-wall domains. Rapid changes in border fault footwall relief in this model are associated with change in the active border fault location with widespread mass-wasting. The model shows that time-dependent histories need to be integrated with flexural uplift models for active normal faults. The active, syn-rift depositional systems of the Ol'khon region provide a valuable analogue for the early evolution of continental margins and the structural controls on syn-rift hydrocarbon sources and reservoirs.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Rift flank segmentation, basin initiation and propagation: a neotectonic example from Lake Baikal
Series title Journal of the Geological Society
DOI 10.1144/gsjgs.152.5.0849
Year Published 1995
Language English
Publisher Geological Society of London
Contributing office(s) Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center
Description 12 p.
First page 849
Last page 860
Country Russia
State Siberia
Other Geospatial Lake Baikal
Online Only (Y/N) N
Additional Online Files (Y/N) N
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