کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4685279 1635486 2012 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Tectonic versus climate influence on landscape evolution: A case study from the upper Spiti valley, NW Himalaya
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Tectonic versus climate influence on landscape evolution: A case study from the upper Spiti valley, NW Himalaya
چکیده انگلیسی

We have undertaken structural, geomorphological, and morphometric analyses to investigate the role of tectonism and climate in the landscape evolution in the upper Spiti valley, NW Himalayas. Geomorphometric analyses coupled with field investigations reveal active tectonic deformation in the Spiti region. The calculated geomorphic indices (steepness, concavity and Hack) demonstrate uplift/subsidence along the Kaurik–Chango fault, whereas transverse topographic index (T-index) reveals basin tilting associated with active faulting near Hansa and Lingti valley. Investigation of well-dated Mane palaeolake sediments also provides evidence of regional tectonic instability. Four episodes (ca. 7.8, 7.4, 6.5 and 6.1 cal ka) of neotectonic activity have been identified during the period of the lake's existence. We have also compiled data on the regional climate variability and compared it with the age of the Mane palaeo-landslide. Our results indicate that the landslide occurred towards the end of the early Holocene intensified monsoon phase and is located near an active fault. Our data on regional tectonic instability and the coincidences of modern and palaeo-landslides with zones of active deformation suggest that tectonism is an important factor governing landscape stability in the Spiti region.


► Role of tectonics and climate on regional landscape evolution in Spiti valley.
► Lake sediments provide evidences for early Holocene tectonic instability.
► Accumulated field data lend credence for a tectonic trigger for palaeo-landslides.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geomorphology - Volumes 145–146, 1 April 2012, Pages 32–44
نویسندگان
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