主 持 人：姚檀栋 院士
地 点：青藏高原研究所办公楼 915 会议室
时 间：2014年10月14日（周二）16:00-18:00
简 介：
Dr. Binita Phartiyal is working as a Scientist in the Quaternary Research Group at the Birbal Sahni Institute of Palaeobotany, Lucknow, India. She received early education from Nainital-a hill station in the Lesser Himalayan Zone and a PhD degree in 2000 from Kumaun University, Nainital. She was a DAAD Fellow at the University of Tuebingen where she worked for a post doc in the environmental magnetic techniques with Prof. Erwin Appel. Trained in several National and International labs- NGRI, Hyderabad; NIO, Goa; WIHG, Dehradun; IIG, Allahabad; NCAOR, Goa; Punjab University; Lucknow University; Tuebingen University and Munich University, Germany on various aspects of Quaternary climate and tectonics. She is well versed in operating instruments for magnetic data generation such as Magnetometers (Cryogenic, Digital spinner, Molspin slow speed fluxgate, Micromag), susceptibility meters, kappa bridge (KLY 2, KLY 3), AFD's, furnaces, magnetizers, etc. and X-ray diffractometer for clay mineralogy and bulk mineralogy data generation. She has a wide field experience and has been a member of several expeditions to the Trans-Himalayan region and the Thar dessert (western India). She is the first Indian women to have taken part in the Indian Scientific Expeditions to both the Poles (Antarctica and Arctic). Recipient of several medals and awards she has published her research work in several national and International journals and presented it in several conferences in India and abroad (Germany, France, Australia, China, Nepal, Pakistan etc). She has 28 papers to her credit and supervising the work of two PhD students.
Her research interest is Quaternary Palaeoclimate, landscape evolution and neotectonics of the cold arid desserts and their comparison with their hot arid dessert counterparts.
摘 要：
Trans Himalayan sector (Ladakh) of the Himalayan mountain chain, exhibits a cold desert environment and is a part of the rain shadow area for the ISM and comes under the Westerly influence. Indus river and its tributaries Shyok, Nubra and Tangtse are major drainage patterns and all have played a major role in shaping the geomorphology of this region. These rivers follow courses along major tectonic fault/thrust lines; Indus Suture Zone, Shyok Suture Zone and Karakorum fault. The river valleys have enormous Quaternary deposits of glacial, lacustrine, palaeo-lacustrine, fluvial and aeolian origin. The sedimentary records represent the changes in melt water and rainfall related hydrology of the river. The geomorphological landscape of this young fold mountain belt is seen to have changed drastically within short time scales. The existence of a 185 km valley lake during the Late Quaternary occupying the present day Tangtse and Shyok river valleys is one such example. Studies suggest that several lakes occupied parts of these river valleys at 40-30, 20-3 ka BP in Tangtse-Shyok region and 17-14 ka BP and 12-3 ka BP along the Indus river valley. As the lake records count for one of the best archive to record high resolution climatic data from the terrestrial regime two glacial lakes lying in the of vicinity of Khardungla (one of the highest pass of the world that separates the Indus valley and Shyok valley) ranging from ~5000 to 400 yrs BP are being studied. The area shows aridity and aeolian activity between 4700-3700 yrs BP. Lake level rise around 3700 yrs BP and rise in clay content lake leading to stable lake conditions from 3000 yrs BP onwards and the sharp signal of the Little Ice age from, as is deduced from the textural, sedimentological, mineral magnetic, geochemical and biotic (palynofacies and diatoms) multi-proxy data is recorded. As previous studies document a weak summer monsoon during this period these high lake levels are possibly due to the effect of strong western disturbances. This initial data along with the CHN and isotopic data will throws light on the type of precipitation (Westerly or ISM) that was dominant in the area from 5000 yrs BP onwards in the Trans Himalaya.
