DOI: 10.1007/s00531-015-1204-0
Scopus记录号: 2-s2.0-84930914624
论文题名: Quaternary extensional and compressional tectonics revealed from Quaternary landforms along Kosi River valley, outer Kumaun Lesser Himalaya, Uttarakhand
作者: Luirei K. ; Bhakuni S.S. ; Kothyari G.C. ; Tripathi K. ; Pant P.D.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2016
卷: 105, 期: 3 起始页码: 965
结束页码: 981
语种: 英语
英文关键词: Fan deposits
; Outer Kumaun Lesser Himalaya
; Ramgarh Thrust
; Sackungen
; South Almora Thrust
Scopus关键词: bedrock
; compression
; extensional tectonics
; landform
; normal fault
; Quaternary
; uplift
; Himalayas
; India
; Kosi River
; Kumaun Himalayas
; Lesser Himalayas
; Uttarakhand
英文摘要: A portion of the Kosi River in the outer Kumaun Lesser Himalaya is characterized by wide river course situated south of the Ramgarh Thrust, where huge thickness (~200 m) of the landslide deposits and two to three levels of unpaired fan terraces are present. Brittle normal faults, suggesting extensional tectonics, are recognized in the Quaternary deposits and bedrocks as further supported by surface morphology. Trending E–W, these faults measure from 3 to 5 km in length and are traced as discontinuous linear mini-horst and fault scarps (sackungen) exposed due to cutting across by streams. Active normal faults have displaced the coarsely laminated debris fan deposits at two sites located 550 m apart. At one of the sites, the faults look like bookshelf faulting with the maximum displacement of ~2 m and rotation of the Quaternary boulders along the fault plane is observed. At another site, the maximum displacement measures about 0.60 cm. Thick mud units deposited due to blocking of the streams by landslides are observed within and above the fan deposit. Landslide debris fans and terrace landforms are widely developed; the highest level of fan is observed ~1240 m above mean sea level. At some places, the reworking of the debris fans by streams is characterized by thick laminated sand body. Along the South Almora Thrust and Ramgarh Thrust zones, the valleys are narrow and V-shaped where Quaternary deposits are sparse due to relatively rapid uplift across these thrusts. Along the South Almora Thrust zone, three to four levels of fluvial terraces are observed and have been incised by river exposing the bedrocks due to recent movement along the RT and SAT. Abandoned channel, tilted mud deposits, incised meandering, deep-cut V-shaped valleys and strath terraces indicate rapid uplift of the area. Thick mud sequences in the Quaternary columns indicate damming of streams. A ~10-km-long north–south trending transverse Garampani Fault has offset the Ramgarh Thrust producing tectonic landforms. © 2015, Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84930914624&doi=10.1007%2fs00531-015-1204-0&partnerID=40&md5=592acb5f5c94d7444d109fe39bd86f0d
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70181
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Wadia Institute of Himalayan Geology, Dehradun, India; Institute of Seismological Research, Raisan, Gandhinagar, India; Department of Geology, Kumaun University, Nainital, India
Recommended Citation:
Luirei K.,Bhakuni S.S.,Kothyari G.C.,et al. Quaternary extensional and compressional tectonics revealed from Quaternary landforms along Kosi River valley, outer Kumaun Lesser Himalaya, Uttarakhand[J]. International Journal of Earth Sciences,2016-01-01,105(3)