DOI: 10.1016/j.quascirev.2018.03.009
Scopus记录号: 2-s2.0-85041400383
论文题名: Timing and nature of Holocene glacier advances at the northwestern end of the Himalayan-Tibetan orogen
作者: Saha S. ; Owen L.A. ; Orr E.N. ; Caffee M.W.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 187 起始页码: 177
结束页码: 202
语种: 英语
英文关键词: Cosmogenic surface exposure dating
; Glacial geology
; Glaciation
; Himalaya
; Holocene
; Intertropical convergence zone
; Paleoclimate
Scopus关键词: Geochronology
; Landforms
; Orbits
; Timing circuits
; Glaciation
; Himalayas
; Holocenes
; Intertropical convergence zone
; Paleoclimates
; Surface exposure dating
; Glacial geology
; atmosphere-ocean coupling
; chronostratigraphy
; cooling
; dating method
; geomorphological mapping
; glaciation
; glacier advance
; Himalayan orogeny
; Holocene
; intertropical convergence zone
; moraine
; teleconnection
; westerly
; Atlantic Ocean
; Atlantic Ocean (North)
; Hamtah Glacier
; Himachal Pradesh
; Himalayas
; India
; Zanskar Himalayas
英文摘要: Holocene glacial chronostratigraphies are developed for four glaciated valleys at the northwestern end of the Himalayan-Tibetan orogen using geomorphic mapping and cosmogenic 10Be surface exposure dating. The study areas include the Hamtah valley in the Lahul Himalaya, and the Karzok, Lato and upper Stok valleys in Zanskar. Five local glacial stages are dated to ∼10.4, ∼6.1–3.3, ∼2.1–0.9, ∼0.7–0.4, and ∼0.3–0.2 ka based on 49 new moraine boulder ages. Large age dispersions are evident for each of the local glacial stages. This is especially the case for ∼6.1–3.3 and ∼2.1–0.9 ka, which is likely a result of prior and/or incomplete exposures in very young moraine boulders. An additional compilation of 187 published 10Be moraine boulder ages help define seven Himalayan Holocene regional glacial stages (HHs) for the northwestern end of the Himalayan-Tibetan orogen. These HHs date to ∼10.9–9.3, ∼8.2–7.4, ∼6.9–4.3, ∼4.5–2.8, ∼2.7–1.8, ∼1.8–0.9, and <1 ka. Early Holocene glacier advances were generally more extensive and had larger equilibrium-line altitude depressions (ΔELA = ∼425 ± 229 m) than glacier advances during the mid-Holocene (ΔELA = ∼141 ± 106) and late Holocene (ΔELA = ∼124 ± 121 m). The early Holocene glacier advances likely correspond to orbitally-forced northerly migration of the Intertropical Convergence Zone and enhanced summer monsoon. The timing of the majority of HHs during mid- and late Holocene corresponds well with the North Atlantic cooling that is likely teleconnected via mid-latitude westerlies, particularly during ∼8 ka and after ∼5 ka. These chronostratigraphies suggest that Holocene glaciation in the northwestern part of the Himalayan-Tibetan orogen is largely influenced by long-term orbital forcing amplified by large-scale migration of the Earth's thermal equator and the associated hemispheric oceanic-atmospheric systems. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112220
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geology, University of Cincinnati, Cincinnati, OH 45221, United States; Department of Physics, Department of Earth, Atmospheric and Planetary Sciences, Purdue University, West Lafayette, IN 47907, United States
Recommended Citation:
Saha S.,Owen L.A.,Orr E.N.,et al. Timing and nature of Holocene glacier advances at the northwestern end of the Himalayan-Tibetan orogen[J]. Quaternary Science Reviews,2018-01-01,187