Isotopic signatures of mercury contamination in latest Permian oceans

被引：225

作者：

Grasby, Stephen E. ^{[1
,2
]}

Shen, Wenjie ^{[3
]}

Yin, Runsheng ^{[4
,5
]}

Gleason, James D. ^{[6
]}

Blum, Joel D. ^{[6
]}

Lepak, Ryan F. ^{[5
]}

Hurley, James P. ^{[5
]}

Beauchamp, Benoit ^{[2
]}

机构：

[1] Nat Resources Canada, Geol Survey Canada, 3303 33rd St NW, Calgary, AB T2L 2A7, Canada

[2] Univ Calgary, Dept Geosci, 2500 Univ Dr NW, Calgary, AB T2N 1N4, Canada

[3] Sun Yat Sen Univ, Sch Earth Sci & Geol Engn, Guangzhou 510275, Guangdong, Peoples R China

[4] Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China

[5] Univ Wisconsin, Environm Chem & Technol Program, Madison, WI 53706 USA

[6] Univ Michigan, Dept Earth & Environm Sci, Ann Arbor, MI 48109 USA

来源：

GEOLOGY | 2017年 / 45卷 / 01期

基金：

美国国家科学基金会;

关键词：

ATMOSPHERIC HG; DEPOSITION; SECTION;

D O I：

10.1130/G38487.1

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

Sedimentary records from the northwest margin of Pangea and the Tethys show anomalously high Hg levels at the latest Permian extinction boundary. Background delta Hg-202 values are consistent with normal marine conditions but exhibit negative shifts coincident with increased Hg concentrations. Hg isotope mass-independent fractionation (Delta Hg-199) trends are consistent with volcanic input in deep-water marine environments. In contrast, nearshore environments have Delta Hg-199 signatures consistent with enhanced soil and/or biomass input. We hypothesize that the deep-water signature represents an overall global increase in volcanic Hg input and that this isotope signature is overwhelmed in nearshore locations due to Hg from terrestrial sources. High-productivity nearshore regions may have experienced stressed marine ecosystems due to enhanced Hg loading.

引用

页码：55 / 58

页数：4

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