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Cyclic anoxia and organic rich carbonate sediments within a drowned carbonate platform linked to Antarctic ice volume changes: Late Oligocene-early Miocene Maldives
Swart, Peter K.; Blattler, Clara L.; Nakakuni, Masatoshi2; Mackenzie, Greta J.; Betzler, Christian3; Eberli, Gregor P.; Reolid, Jesus4; Alonso-Garcia, Montserrat; Slagle, Angela L.; Wright, James D.; Kroon, Dick9; Reijmer, John J. G.; Mee, Anna L. Hui; Young, Jeremy R.; Alvarez-Zarikian, Carlos A.; Bialik, Orr M.; Guo, Junhua Adam14; Haffen, Sebastian15; Horozal, Senay16; Inoue, Mayuri17; Jovane, Luigi18; Lanci, Luca19; Laya, Juan Carlos20; Luedmann, Thomas; Nath, B. Nagender; Niino, Kaoru22; Petruny, Loren M.; Pratiwi, Santi Dwi24; Su, Xiang25; Sloss, Craig R.; Yao, Zhengquan26,27
AbstractThis paper reports on the newly discovered occurrence of thick sequences (similar to 100 m) of Late Oligocene and Early Miocene (similar to 24.9 to similar to 20 Ma) interbedded organic-rich sediments (sapropels) and pelagic (organic poor) carbonates at Sites 01466 and U1468 drilled in the Maldives archipelago during the International Ocean Discovery Program (IODP) Expedition 359. This occurrence is unusual in that this sequence is located > 1000 m above the surrounding ocean floor within an inter-atoll basin and not linked to any known global oceanic events. Total organic content reaches as high as 35% in the darker layers, while the interbedded carbonates have concentrations of less than 0.1%. Trace elements characteristic of anoxic waters, such as Mo, V, Cr, U, and Pb, correlate positively with concentrations of organic carbon. Nitrogen isotopic data show no evidence that the intervals of high total organic carbon are related to enhanced productivity driven by upwelling. Instead, high organic carbon is associated with intervals of anoxia. We propose that sea-level fluctuations linked to changes in Antarctic ice volume restricted exchange with the open ocean causing bottom waters of the inter-atoll basin to become anoxic periodically. The architecture of the platform at the end of the Oligocene, combined with the global sea-level highstand, set the stage for orbitally-driven sea-level changes producing cyclic deposition of sapropels. The proposed mechanism may serve as an analogue for other occurrences of organic carbon rich sediments within carbonate platform settings. (C) 2019 Elsevier B.V. All rights reserved.
Keywordsapropels anoxia sea level carbonate platforms
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Affiliation1.Univ Miami, Dept Marine Geosci, RSMAS, Miami, FL 33149 USA
2.Blattler, Clara L.] Univ Chicago, Dept Geophys Sci, 5734 S Ellis Ave, Chicago, IL 60637 USA
3.Soka Univ, Dept Environm Engn Symbiosis, 1-236 Tangi Cyo, Hachioji, Tokyo 1920003, Japan
4.Univ Hamburg, CEN, Inst Geol, Bundesstr 55, D-20146 Hamburg, Germany
5.Univ Granada, Dept Estratig & Paleontol, Avd Fuente Nueva S-N, E-18071 Granada, Spain
6.IPMA, Rua Alfredo Magalhaes Ramalho,6, P-1495006 Lisbon, Portugal
7.Univ Algarve, Ctr Ciencias Mar CCMAR, P-8005139 Faro, Portugal
8.Slagle, Angela L.] Columbia Univ, Lamont Doherty Earth Observ, Borehole Bldg 61 Route 9W, Palisades, NY 10964 USA
9.Wright, James D.] Rutgers State Univ, Dept Geol Sci, 610 Taylor Rd, Piscataway, NJ 08854 USA
10.Univ Edinburgh, Grant Inst, Sch GeoSci, Kings Bldg,James Hutton Road, Edinburgh EH9 3FE, Midlothian, Scotland
11.Reijmer, John J. G.] King Fand Univ Petr & Minerals, Coll Petr Engn & Geosci, Geosci Dept, Dhahran 31261, Saudi Arabia
12.Young, Jeremy R.] UCL, Dept Earth Sci, Gower St, London WC1E 6BT, England
13.Alvarez-Zarikian, Carlos A.] Texas A&M Univ, Int Ocean Discovery Program, Discovery Dr, College Stn, TX 77845 USA
14.Bialik, Orr M.] Univ Haifa, Leon H Charney Sch Marine Sci, Dr Moses Strauss Dept Marine Geosci, IL-31905 Carmel, Israel
15.Calif State Univ Bakersfield, Dept Geol Sci, 9001 Stockdale Highway, Bakersfield, CA 93311 USA
16.Univ Lorraine, Ecole Natl Super Geol, GeoRessources Lab, UMR 7359,CNRS,CREGU, 2 Rue Doyen Marcel Roubault, F-54501 Vandoeuvre Les Nancy, France
17.Korea Inst Geosci & Mineral Resources KIGAM, Petr & Marine Res Div, Gwahang 124, Daejeon 305350, South Korea
18.Okayama Univ, Grad Sch Nat Sci & Technol, 3-1-1 Tsushima Naka, Okayama 7008530, Japan
19.Univ Sao Paulo, Inst Oceanog, Pmca Oceanog,191, BR-05508120 Sao Paulo, SP, Brazil
20.Univ Urbino, Dept Pure & Appl Sci, Via S Chiara 27, I-61029 Urbino, Italy
21.Texas A&M Univ, Dept Geol & Geophys, Mail Stop 3115, College Stn, TX 77843 USA
22.CSIR Nat Inst Oceanog, Geol Oceanog Div, Panaji 403004, Goa, India
23.Yamagata Univ, Grad Sch Sci & Engn, 1-4-12 Kojirakawa Machi, Yamagata 9908560, Japan
24.Petruny, Loren M.; Sloss, Craig R.] Queensland Univ Technol, Earth & Environm Sci, R Block 317,2 George St, Brisbane, Qld 4001, Australia
25.Univ Padjadjaran, Geol Engn Fac, Dept Geosci, Jl Raya Bandung Sumedang Km 21, Jatinangor 45363, Indonesia
26.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China
27.SOA, FIO, Dept Marine Geol, 6 Xian Xia Ling Rd, Qingdao 266061, Shandong, Peoples R China
28.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Shandong, Peoples R China
29.Univ Salamanca, Dept Geol, Pza Caidos S-N, E-37008 Salamanca, Spain
Recommended Citation
GB/T 7714
Swart, Peter K.,Blattler, Clara L.,Nakakuni, Masatoshi,et al. Cyclic anoxia and organic rich carbonate sediments within a drowned carbonate platform linked to Antarctic ice volume changes: Late Oligocene-early Miocene Maldives[J]. EARTH AND PLANETARY SCIENCE LETTERS,2019,521:1, 13.
APA Swart, Peter K..,Blattler, Clara L..,Nakakuni, Masatoshi.,Mackenzie, Greta J..,Betzler, Christian.,...&Yao, Zhengquan.(2019).Cyclic anoxia and organic rich carbonate sediments within a drowned carbonate platform linked to Antarctic ice volume changes: Late Oligocene-early Miocene Maldives.EARTH AND PLANETARY SCIENCE LETTERS,521,1.
MLA Swart, Peter K.,et al."Cyclic anoxia and organic rich carbonate sediments within a drowned carbonate platform linked to Antarctic ice volume changes: Late Oligocene-early Miocene Maldives".EARTH AND PLANETARY SCIENCE LETTERS 521(2019):1.
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