Spatial variation in sediment fluxes, redox conditions, and productivity in the Permian-Triassic Panthalassic Ocean

被引:364
作者
Algeo, Thomas J. [1 ]
Kuwahara, Kiyoko [2 ]
Sano, Hiroyoshi [3 ]
Bates, Steven [4 ]
Lyons, Timothy [4 ]
Elswick, Erika [5 ]
Hinnov, Linda [6 ]
Ellwood, Brooks [7 ]
Moser, Jessa [1 ]
Maynard, J. Barry [1 ]
机构
[1] Univ Cincinnati, Dept Geol, Cincinnati, OH 45221 USA
[2] Ashiya Univ, Fac Clin Educ, Ashiya 6598511, Japan
[3] Kyushu Univ, Dept Earth & Planetary Sci, Fukuoka 8128581, Japan
[4] Univ Calif Riverside, Dept Earth Sci, Riverside, CA 92521 USA
[5] Indiana Univ, Dept Geol Sci, Bloomington, IN 47405 USA
[6] Johns Hopkins Univ, Dept Earth & Planetary Sci, Baltimore, MD 21218 USA
[7] Louisiana State Univ, Dept Geol & Geophys, Baton Rouge, LA 70803 USA
基金
美国国家科学基金会;
关键词
Chert; Black shale; Primary productivity; Radiolarians; Mass extinction; Sediment geochemistry; Japan; EQUATORIAL PACIFIC; MASS EXTINCTION; ISOTOPIC EVIDENCE; ORGANIC-CARBON; BEDDED CHERT; SULFUR; BOUNDARY; PYRITE; GEOCHEMISTRY; JAPAN;
D O I
10.1016/j.palaeo.2010.07.007
中图分类号
P9 [自然地理学];
学科分类号
070501 [自然地理学];
摘要
Two Permian/Triassic boundary sections in central Japan provide a rare window into environmental conditions within the Panthalassic Ocean, which encompassed more than half the Earth's surface at 252 Ma. Integration of petrographic, geochemical, and time series data provides new insights regarding the fluxes of major and trace components to the sediment as well as environmental conditions in both the deep and intermediate water masses at each study site. The Ubara section was located in a high-productivity peri-equatorial location, whereas the Gujo-Hachiman section was located in a moderate-productivity location at some distance from the paleoequator. An upward transition from gray organic-poor cherts to black siliceous mudstones at both sites occurred in conjunction with increased primary productivity, intensified euxinia within the oxygen-minimum zone (OMZ), and decimation of the radiolarian zooplankton community. Euxinia in the OMZ of the equatorial Panthalassic Ocean developed episodically for a -200-250 kyr interval during the Late Permian, followed by an abrupt intensification and lateral expansion of the OMZ around the Permian-Triassic boundary. Throughout the study interval, bottom waters at both sites remained mostly suboxic, a finding that counters hypotheses of development of a "superanoxic" Permo-Triassic deep ocean as a consequence of stagnation of oceanic overturning circulation. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码:65 / 83
页数:19
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