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doi:10.1016/j.revpalbo.2006.10.005    
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Copyright © 2006 Elsevier B.V. All rights reserved.

Vegetation history and palaeoclimate of the past 30 kyr in Pakistan as inferred from the palynology of continental margin sediments off the Indus Delta

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Murtaza H. Ansaria, 1 and Annemiek Vinkb, Corresponding Author Contact Information, E-mail The Corresponding Author

aNational Institute of Oceanography, ST 47, Block 1, Clifton, Karachi-75600, Pakistan

bBundesanstalt für Geowissenschaften und Rohstoffe, Stilleweg 2, 30655 Hannover, Germany


Received 8 September 2005; 
revised 25 October 2006; 
accepted 27 October 2006. 
Available online 22 December 2006.

Abstract

Palynological investigations on a continuous uppermost Pleistocene to Holocene high-resolution gravity core collected from the continental margin off the Indus Delta provide the first, uninterrupted, 30-kyr-long record of vegetation history and palaeoclimate of the Pakistan hinterland. Core analysis and interpretation allows the recognition of (1) greater glacial aridity than during the following postglacial period up to the present day; (2) a significant southward extension of the Himalayan sub-alpine and deciduous hardwood tree zone during the time interval from the Last Glacial Maximum (LGM) to the Younger Dryas cold interval; (3) extreme aridity and climatic deterioration during the LGM and the equivalent to Heinrich event 1; (4) a marked change to early Holocene humid conditions, starting already during the Bölling/Alleröd and increasing abruptly during the Preboreal period; and (5) a gradual reduction of humidity from the middle Holocene to the present. These results are in general agreement with palaeoclimatic reconstructions based on multiple proxies from the Indian subcontinent as well as the Arabian Sea, and especially confirm the occurrence of a clear precipitation maximum in Pakistan between ca. 9 and 7 cal. kyr BP which probably resulted from a combination of increased and prolonged summer (SW) monsoonal strength; both processes ultimately being controlled by orbital changes in northern hemisphere summer insolation and shifts in the position of the Intertropical Convergence Zone.

Keywords: Pakistan; late Quaternary; marine palynology; vegetation reconstruction; palaeoclimate; middle Holocene precipitation optimum

Article Outline

1. Introduction
2. Climate and the modern vegetation succession in Pakistan
3. Material, methods and stratigraphy
3.1. Sample collection and palynological preparation
3.2. Stratigraphy of core 119 KA
4. Results
4.1. Pollen zone I (885–555 cm)
4.2. Pollen zone II (555–235 cm)
4.3. Pollen zone III (235–0 cm)
5. Discussion
5.1. Pollen taphonomy (preservation, provenance, dispersal)
5.2. Palaeoclimatic interpretation of the pollen record
6. Conclusions
Acknowledgements
Appendix A.Supplementary data
References





Corresponding Author Contact InformationCorresponding author. Tel.: +49 511 6432392; fax: +49 511 6433663.
1 Present address: Department of Geology, University of Toronto, Toronto, Ontario, Canada M5S 3B1.

 
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