Reconstruction of Late Quaternary neotectonic movements and fluvial activity in Sikkimese-Bhutanese Himalayan Piedmont

• Autorzy: Starkel L. , Płaskonka D. , Adamiec G.

Identyfikatory

DOI

10.1515/sgcb-2015-0010

• Języki publikacji: EN

Abstrakty

EN

In the part of Sikkimese-Bhutanese Himalaya the youngest Siwalik overthrust had not developed, and the piedmont zone with extensive fans forms a semicircular gulf dismembered by several faults and minor overthrusts. Some uplifted parts of older deformed alluvial fans contain the lenses of organic clays which were earlier dated at 22–34 ka BP by 14C method. Various elevated levels differ also in soil maturity. It means that the main tectonic activity with overthrusting could occur later. To distinguish various alluvial formations and phases of tectonic activity the authors dated older levels in several localities by OSL method as well as investigated soil profiles. Most mature soils over elevated blocks built of coarse alluvia were dated between 50 and 60 ka BP. Probably the previous 14C dates from clays are too young, and on the contrary OSL dates are overestimated. The younger generation of fans (10–15 m high) dated at about 14 ka coincide with the start of monsoonal pre-Holocene activity. The authors try to correlate these phases with terraces and tectonic activity in the most eastern part of the Himalayas (two phases of overthrusting: after 50 ka and 10–5 ka BP) as well as with events outside the piedmont zone: glacifluvial aggradation in the Tista valley during advance of glaciers in Sikkim and with sequence of deposits in the Brahmaputra delta.

Słowa kluczowe

EN

neotectonic movements; maturity of soils; OSL dating; Sikkimese-Bhutanese Himalayan piedmont

• Wydawca: Polska Akademia Umiejętności
• Czasopismo: Studia Geomorphologica Carpatho-Balcanica
• Rocznik: 2015
• Tom: Vol. 49
• Strony: 71--82
• Opis fizyczny: Bibliogr. 21 poz., rys.

Twórcy

autor

Starkel L.

• Institute of Geography and Spatial Organization PAS, Department of Geoenvironmental Research; 22 Św. Jana str., 31-018 Krakow, Poland

autor

Płaskonka D.

• Institute of Geography and Spatial Organization PAS, Department of Geoenvironmental Research; 22 Św. Jana str., 31-018 Krakow, Poland

autor

Adamiec G.

• Silesian University of Technology, Institute of Physics; 2 Krzywoustego str., 44-100 Gliwice, Poland

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