Organic geochemical investigation of far-field tsunami deposits of the Kahana Valley, O'ahu, Hawai'i

被引：12

作者：

Bellanova, Piero ^{[1
,2
]}

Frenken, Mike ^{[1
,2
]}

Richmond, Bruce ^{[3
]}

Schwarzbauer, Jan ^{[1
]}

La Selle, Seanpaul ^{[3
]}

Griswold, Frances ^{[3
]}

Jaffe, Bruce ^{[3
]}

Nelson, Alan ^{[4
]}

Reicherter, Klaus ^{[2
]}

机构：

[1] Rhein Westfal TH Aachen, Inst Geol & Geochem Petr & Coal, Lochnerstr 4-20, D-52056 Aachen, Germany

[2] Rhein Westfal TH Aachen, Lehr & Forschungsgebiet Neotekton & Georisiken, Lochnerstr 4-20, D-52056 Aachen, Germany

[3] US Geol Survey, Pacific Coastal & Marine Sci Ctr, 2885 Mission St, Santa Cruz, CA 95060 USA

[4] US Geol Survey, Geol Hazards Sci Ctr, Golden, CO 80401 USA

来源：

SEDIMENTOLOGY | 2020年 / 67卷 / 03期

关键词：

Anthropogenic marker; Hawai'i; Kahana Valley; organic geochemistry; tsunami; IDENTIFICATION; POLLUTION; FREQUENT; ISLANDS; COAST; PROXY; SEA;

D O I：

10.1111/sed.12583

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

Far-field tsunami deposits observed in the Kahana Valley, O'ahu, Hawai'i (USA), were investigated for their organic-geochemical content. During short high-energy events, (tsunamis and storms) organic and chemical components are transported with sediment from marine to terrestrial areas. This study investigates the use of anthropogenic based organic geochemical compounds (such as polycyclic aromatic hydrocarbons, pesticides and organochlorides) as a means to identify tsunami deposits. Samples were processed by solid-liquid extraction and analyzed using gas chromatography-mass spectrometry. A total of 21 anthropogenic marker compounds were identified, of which 11 compounds were selected for detailed analysis. Although the tsunami deposits pre-date industrial activity in Hawai'i by several hundred years, distinct changes were found in the concentrations of anthropogenic marker compounds between sandy tsunami deposits and the surrounding mud/peat layers, which may help in identifying tsunami deposits within cores. As expected, low overall concentrations of anthropogenic markers and pollutants were observed due to the lack of industrial input-sources and little anthropogenic environmental impact at the study site. This geochemical characterization of tsunami deposits shows that anthropogenic markers have significant potential as another high-resolution, multi-proxy method for identifying tsunamis in the sedimentary record.

引用

页码：1230 / 1248

页数：19

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