Zoeken
Zoeken kan via de modus 'eenvoudig zoeken' (één veld) of uitgebreid via 'geavanceerd zoeken' (meerdere velden). Zo kan je bv. zoeken op een combinatie van een auteursnaam (auteur), een jaartal (jaar) en een documenttype.
Boekenmand
Nuttige resultaten kan je aanvinken en toevoegen aan een mandje. De inhoud hiervan kan je exporteren of afdrukken (naar bv. PDF).
RSS
Op de hoogte blijven van nieuw toegevoegde publicaties binnen uw interessegebied? Dit kan door een RSS-feed (?) te maken van jouw zoekopdracht.
nieuwe zoekopdracht
Elemental signature of terrigenous sediment runoff as recorded in coastal salt ponds: US Virgin Islands
Larson, R.A.; Brooks, G.R.; Devine, B.; Schwing, P.T.; Holmes, C.W.; Jilbert, T.; Reichart, G.J. (2015). Elemental signature of terrigenous sediment runoff as recorded in coastal salt ponds: US Virgin Islands. Appl. Geochem. 63: 573–585. dx.doi.org/10.1016/j.apgeochem.2015.01.008
In: Applied Geochemistry. Pergamon: Oxford. ISSN 0883-2927; e-ISSN 1872-9134, meer
|  |
| Auteurs | | Top |
- Larson, R.A.
- Brooks, G.R.
- Devine, B.
- Schwing, P.T.
|
- Holmes, C.W.
- Jilbert, T.
- Reichart, G.J.
|
|
| Abstract |
A high-resolution, multi-proxy approach is utilized on mm- to cm-scale laminated coastal salt pond sediments from St. John, U.S. Virgin Islands, to determine: (1) the sedimentological signature of depositional events/processes, (2) link this sedimentological signature with known depositional events/processes in the historical (past ~100 years) record; and, (3) project back into the recent geologic past (past ~1400 years) to investigate the natural variability of depositional events/processes. High-resolution, short-lived radioisotope geochronology (210Pb, 137Cs, 7Be) combined with high-resolution elemental scanning techniques (scanning XRF and scanning LA-ICP-MS) allows for the direct comparison of well-preserved salt pond deposits to historical records of depositional events (e.g., runoff/rainfall, tropical cyclones, tsunamis) to identify the sedimentary signature of each type of event. There is a robust sedimentary record of terrigenous sediment runoff linked to the frequency of rainfall events that exceed a threshold of ~12 mm/day (minimum to mobilize and transport sediment) for study sites. This is manifested in the sedimentary record as increases in terrigenous indicator elements (%Al, %Fe, %Ti, %Si), which agree well with rainfall records over the past ~50 years. Variability in the sedimentary record over the past ~100 years reflects decadal-scale fluctuations between periods of increased frequency of rainfall events, and decreased frequency of rainfall events. Dm-scale variability in terrigenous indicator elements over the past ~1400 years represents the natural system variability on a decadal–centennial scale, and provides a high-resolution, long-term baseline of natural variability of rainfall/runoff events. A period of increased terrigenous sediment delivery during the 1700s and 1800s likely indicates increased erosion in response to anthropogenic activities associated with the island’s plantation era, and perhaps increased frequency of rainfall events. |
IMIS is ontwikkeld en wordt gehost door het VLIZ.
