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Indian Ocean high-productivity event (10-8 Ma); linked to global cooling or to the initiation of the Indian monsoons?

Anil K. Gupta, Raj K. Singh, Sudheer Joseph and Ellen Thomas
Indian Ocean high-productivity event (10-8 Ma); linked to global cooling or to the initiation of the Indian monsoons?
Geology (Boulder) (September 2004) 32 (9): 753-756

Abstract

Uplift of the Himalayas and Tibetan Plateau (ca. 10-8 Ma) has been said to be the main cause of the origin or intensification of the Indian monsoon system, because mountains modulate the land-sea thermal contrast. The intensification of the monsoons, in turn, is seen as the cause of major changes in fauna and flora on land (as a result of changing precipitation patterns) as well as in the Indian Ocean, where the monsoons drive increased upwelling and thus increased productivity. We argue that the interactions between the elevation of the Himalayas and Tibetan Plateau, the onset of the monsoons, and their effects on the Indian Ocean biota remain uncertain. The timing of these events (uplift, monsoons, and biotic change) is not well constrained. Neogene deep-sea benthic foraminiferal faunal and isotope records of the Ninetyeast Ridge combined with published data show that a major increase in biogenic productivity occurred at 10-8 Ma throughout the Indian Ocean, the equatorial Pacific, and southern Atlantic. We suggest that this Indian Ocean high-productivity event was not simply the result of monsoon-induced upwelling or nutrient delivery from the weathering of newly uplifted mountains, but may have been caused by strengthened wind regimes resulting from global cooling and the increase in volume of the Antarctic ice sheets.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 32
Serial Issue: 9
Title: Indian Ocean high-productivity event (10-8 Ma); linked to global cooling or to the initiation of the Indian monsoons?
Affiliation: Indian Institute of Technology, Department of Geology and Geophysics, Kharagpur, India
Pages: 753-756
Published: 200409
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 40
Accession Number: 2004-070961
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2004131
Illustration Description: illus. incl. 1 table, sketch map
S30°53'29" - S30°53'28", E93°34'39" - E93°34'40"
S17°01'28" - S17°01'23", E88°10'48" - E88°10'54"
N05°23'02" - N05°23'03", E90°21'40" - E90°21'41"
S11°20'13" - S11°20'13", E88°43'05" - E88°43'05"
N01°27'43" - N01°27'44", E90°12'28" - E90°12'29"
Secondary Affiliation: Wesleyan University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200421
Program Name: ODPOcean Drilling Program
Program Name: DSDPDeep Sea Drilling Project
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