首页|A combined tectono-climatic control on Holocene sedimentation in Ladakh Himalaya,India:Clues from Anisotropy of Magnetic Susceptibility(AMS)of lake sediments
A combined tectono-climatic control on Holocene sedimentation in Ladakh Himalaya,India:Clues from Anisotropy of Magnetic Susceptibility(AMS)of lake sediments
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Anisotropy of Magnetic Susceptibility(AMS)data from a～27.8 m thick soft sedimentary mud sequence(～10.5-3.25 k yrs)from the Spituk Palaeolake Sequence(SPSS)of Holocene age,located in the northern bank of the Indus River in the Leh-Ladakh Himalaya,show effects of tectonic versus climate dynamics responsible for the Himalayan sedimentation.The sedimentary sequence,consisting of alternating of aeolian sand and glacio-fluvial mud flow deposits,has been subdivided into an older Last Glacier Phase I(LGP 1)and a younger Last Glacier Phase Ⅱ(LGP 2),where the termination of each phase is marked by the occurrence of gravel beds of thickness ≤1 m,which were deposited due to glacial melting.The present AMS data along with previously published information on sedimentology confirm that the mudflow deposits of the LGP 1 and LGP 2 phases were deposited in a lacustrine environment under glacio-fluvial conditions.However,a weak fluvial flow towards NW and NE could have existed for the LGP 1 and LGP 2,respectively.The glacial beds terminating LGP 1 and LGP 2 appear to have formed by climatic warming and tectonic activity,respectively.Hence,the Holocene Himalayan sedimentation was influenced by both climatic and tectonic activities.However,the thickness of the gravel bed(～0.8 m)terminating LGP 2 occupies only～2.8 vol％of the total studied thickness～28 m,of the SPSS in the present study,which indicated a lesser control of tectonism in the growth of the Himalaya in and around the study area.
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