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

Abstract

Research Article| September 01, 2004 Indian Ocean high-productivity event (10–8 Ma): Linked to global cooling or to the initiation of the Indian monsoons? Anil K. Gupta; Anil K. Gupta 1Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur-721 302, W.B., India Search for other works by this author on: GSW Google Scholar Raj K. Singh; Raj K. Singh 1Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur-721 302, W.B., India Search for other works by this author on: GSW Google Scholar Sudheer Joseph; Sudheer Joseph 1Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur-721 302, W.B., India Search for other works by this author on: GSW Google Scholar Ellen Thomas Ellen Thomas 2Department of Earth and Environmental Sciences, Wesleyan University, Middletown, Connecticut 06459-0139, USA, and Department of Geology and Geophysics, Yale University, P.O. Box 208109, New Haven, Connecticut 06520-8109, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Anil K. Gupta 1Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur-721 302, W.B., India Raj K. Singh 1Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur-721 302, W.B., India Sudheer Joseph 1Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur-721 302, W.B., India Ellen Thomas 2Department of Earth and Environmental Sciences, Wesleyan University, Middletown, Connecticut 06459-0139, USA, and Department of Geology and Geophysics, Yale University, P.O. Box 208109, New Haven, Connecticut 06520-8109, USA Publisher: Geological Society of America Received: 19 Mar 2004 Revision Received: 27 Apr 2004 Accepted: 04 May 2004 First Online: 03 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2004) 32 (9): 753–756. https://doi.org/10.1130/G20662.1 Article history Received: 19 Mar 2004 Revision Received: 27 Apr 2004 Accepted: 04 May 2004 First Online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Anil K. Gupta, Raj K. Singh, Sudheer Joseph, Ellen Thomas; Indian Ocean high-productivity event (10–8 Ma): Linked to global cooling or to the initiation of the Indian monsoons?. Geology 2004;; 32 (9): 753–756. doi: https://doi.org/10.1130/G20662.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search 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. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.