Dixit, Yama and Hodell, David A. and Petrie, Cameron A. (2014) Abrupt weakening of the summer monsoon in northwest India ~4100 yr ago. Geology, 42 (4). pp. 339-342. ISSN 0091-7613, 1943-2682 DOI 10.1130/G35236.1
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Climate change has been suggested as a possible cause for the decline of urban centers of the Indus Civilization ∼4000 yr ago, but extant paleoclimatic evidence has been derived from locations well outside the distribution of Indus settlements. Here we report an oxygen isotope record of gastropod aragonite (δ18Oa) from Holocene sediments of paleolake Kotla Dahar (Haryana, India), which is adjacent to Indus settlements and documents Indian summer monsoon (ISM) variability for the past 6.5 k.y. A 4‰ increase in δ18Oa occurred at ca. 4.1 ka marking a peak in the evaporation/precipitation ratio in the lake catchment related to weakening of the ISM. Although dating uncertainty exists in both climate and archaeological records, the drought event 4.1 ka on the northwestern Indian plains is within the radiocarbon age range for the beginning of Indus de-urbanization, suggesting that climate may have played a role in the Indus cultural transformation.
|Uncontrolled Keywords:||2014AREP; IA67;|
|Subjects:||01 - Climate Change and Earth-Ocean Atmosphere Systems|
|Divisions:||01 - Climate Change and Earth-Ocean Atmosphere Systems
07 - Gold Open Access
|Journal or Publication Title:||Geology|
|Page Range:||pp. 339-342|
|Depositing User:||Sarah Humbert|
|Date Deposited:||29 May 2014 16:39|
|Last Modified:||09 Jun 2014 08:57|
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