DOI: 10.1016/j.quascirev.2013.05.016
Scopus记录号: 2-s2.0-84879293779
论文题名: Chronology and climatic implications of Late Quaternary glaciations in the Goriganga valley, central Himalaya, India
作者: Nawaz Ali S. ; Biswas R.H. ; Shukla A.D. ; Juyal N.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 73 起始页码: 59
结束页码: 76
语种: 英语
英文关键词: Central Himalaya
; Late Quaternary glaciations
; Mid-latitude westerlies
; Optical dating
; Outwash terraces
Scopus关键词: Himalayas
; Late quaternary
; Mid-latitude westerlies
; Optical dating
; Outwash terraces
; Landforms
; Glacial geology
; dating method
; diamictite
; geochronology
; moraine
; outwash
; paleoclimate
; Quaternary
; terrace
; westerly
; Gori Valley
; Himalayas
; India
; Uttarakhand
英文摘要: Goriganga valley, which is located in the transition zone between the dry steppe of the Tibetan plateau in the north and the sub-humid Himalayan climate in the south, has preserved four events of glaciation with decreasing magnitude. The oldest Stage-I glaciation is represented by a ~12.5km long discontinuous diamictite ridge which terminates north of Rilkot (~3100masl). The Stage-II glaciation is represented by sub-rounded and partially eroded lateral moraines and terminates around Martoli village (~3240masl). The Stage-III and IV glacial moraines are sharp crested, unstable and terminate proximal to the present day glacier at ~3640masl and ~3740masl respectively. The Stage-II moraines have been optically dated between 25±2ka and 22±1ka implying that glacier expanded during the global Last Glacial Maximum (LGM). This is contrary to the suggestion that during Last Glacial maximum (LGM) glaciation was limited in extent due to weak Indian Summer Monsoon (ISM) in the monsoon dominated regions of the Himalaya. We ascribe the LGM glaciations to a combination of the lowered temperature and enhanced mid-latitude westerlies. Following the LGM glaciation, Goriganga valley experienced two major pulses of deglaciation. The older event is dated between 16 and 12ka and is coeval with the initiation of the ISM whereas the younger events (10-8ka) represent the early to mid-Holocene strengthened ISM. The Stage-III and IV glaciations which terminated proximal to the modern glacier are speculated to occur during the mid-Holocene and Little Ice Age (LIA) respectively. © 2013 Elsevier Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60588
Appears in Collections: 过去全球变化的重建
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作者单位: Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, India
Recommended Citation:
Nawaz Ali S.,Biswas R.H.,Shukla A.D.,et al. Chronology and climatic implications of Late Quaternary glaciations in the Goriganga valley, central Himalaya, India[J]. Quaternary Science Reviews,2013-01-01,73