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Geptner A.R.,Russian Academy of Sciences | Pha P.D.,Institute of Geological science VAST | Petrova V.V.,Russian Academy of Sciences | Huyen N.X.,Institute of Geological science VAST | And 2 more authors.
Lithology and Mineral Resources | Year: 2013

Morphological features of the columnar-stratiform stromatolites, which resemble the cone-in-cone structure, from Neogene lacustrine sediments of northern Vietnam are analyzed. Their structural-textural peculiarities and interrelations with the host terrigenous sediments of a stromatolitic buildup are discussed. It is shown that stages of the growth of columns are recorded in the succession of vertically oriented carbonate plates, which form stromatolites, and in the serrate surface protrusions of the plates at their contacts with host sediments. It is established that replacement of the columnar stromatolites by the stratiform varieties in the section can be related to variations in the intensity of terrigenous material influx to the sedimentation basin. Stratiform stromatolites were formed during relatively slow accumulation of sedimentary material. Appearance of the columnar varieties is attributed to intensification of sedimentation. © 2013 Pleiades Publishing, Ltd.

Cuong T.Q.,Institute of Geological science VAST | Minh D.H.T.,IRSTEA | Minh D.H.T.,CNRS Center for the Study of the Biosphere from Space | Van Trung L.,Ho Chi Minh City University of Technology | Le Toan T.,CNRS Center for the Study of the Biosphere from Space
International Geoscience and Remote Sensing Symposium (IGARSS) | Year: 2015

The rapidly developing urbanization since the last decade of the 20th century leads to the strong groundwater extraction, resulting in the subsidence phenomena in the Ha Noi and Ho Chi Minh City, Vietnam. Recent advances in the multi-temporal spaceborne SAR interferometry, especially with Persistent Scatters Interferometry (PSI) approach, is the robust remote sensing technique for measuring ground subsidence in large scale with millimetric accuracy. This work has presented an advance PSI analysis, to provide unprecedented spatial extent and continuous temporal coverage of the subsidence in Ha Noi and Ho Chi Minh City. © 2015 IEEE.

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