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Organic geochemical record of increased productivity in Lake Naukuchiyatal, Kumaun Himalayas, India
Stockholm University, Faculty of Science, Department of Geological Sciences.
2010 (English)In: ENVIRONMENTAL EARTH SCIENCES, ISSN ISSN 1866-6299, Vol. 60, no 4, 837-843 p.Article in journal (Refereed) Published
Abstract [en]

Organic geochemical proxies have been studied in a 45-cm-long core retrieved from Lake Naukuchiyatal in Kumaun Himalayas, India. Increase in TOC, N, hydrocarbons and pigments concentration from bottom to surface sediments of the core indicates increase in the lake productivity. Stable isotopes (δ13C and δ 15 N), biomarkers (TAR, CPI and n-ΣC15,17,19) and C/N atomic (between 9 and 12) suggest dominance of algal derived organic matter in these sediments. Decrease in organic δ13C values (between −27 and −31‰) in surface sediments indicate influence of sewage and land runoff in shifting organic δ13C values, whereas low (between −0.23 and 2.2‰) δ15N values together with high pigment concentrations (zeaxanthin and echinenone) represent dominance of cyanobacteria in the lake.

Place, publisher, year, edition, pages
Springer , 2010. Vol. 60, no 4, 837-843 p.
Keyword [en]
Organic matter - Lake productivity - Stable isotopes - Hydrocarbons and pigments
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:su:diva-50041DOI: 10.1007/s12665-009-0221-3OAI: diva2:380481
3Available from: 2010-12-21 Created: 2010-12-21Bibliographically approved

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