Geochemical data and magnetic measurements of IODP Expedition 308, Hole U1319A from the Gulf of Mexico
Fuente:
PANGAEA
Salvato in:
| Autori principali: | , , , , |
|---|---|
| Natura: | Dataset Open Access |
| Lingua: | en |
| Pubblicazione: |
PANGAEA
2010
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1867167662549762048 |
|---|---|
| author | Fu, Yanzhe von Dobeneck, Tilo Franke, Christine Heslop, David Kasten, Sabine |
| author_facet | Fu, Yanzhe von Dobeneck, Tilo Franke, Christine Heslop, David Kasten, Sabine |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | A 160 m mostly turbiditic late Pleistocene sediment sequence (IODP Expedition 308, Hole U1319A) from the Brazos-Trinity intraslope basin system off Texas was investigated with paleo- and rock magnetic methods. Numerous layers depleted in iron oxides and enriched by the ferrimagnetic iron-sulfide mineral greigite (Fe3S4) were detected by diagnostic magnetic properties. From the distribution of these layers, their stratigraphic context and the present geochemical zonation, we develop two conceptual reaction models of greigite formation in non-steady depositional environments. The "sulfidization model" predicts single or twin greigite layers by incomplete transformation of iron monosulfides with polysulfides around the sulfate methane transition (SMT). The "oxidation model" explains greigite formation by partial oxidation of iron monosulfides near the iron redox boundary during periods of downward shifting oxidation fronts. The stratigraphic record provides evidence that both these greigite formation processes act here at typical depths of about 12-14 mbsf and 3-4 mbsf. Numerous "fossil" greigite layers most likely preserved by rapid upward shifts of the redox zonation denote past SMT and sea floor positions characterized by stagnant hemipelagic sedimentation conditions. Six diagenetic stages from a pristine magnetite-dominated to a fully greigite-dominated magnetic mineralogy were differentiated by combination of various hysteresis and remanence parameters. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_733404 |
| institution | PANGAEA |
| language | en |
| publishDate | 2010 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Geochemical data and magnetic measurements of IODP Expedition 308, Hole U1319A from the Gulf of Mexico Fu, Yanzhe von Dobeneck, Tilo Franke, Christine Heslop, David Kasten, Sabine 308-U1319A; Center for Marine Environmental Sciences; DRILL; Drilling/drill rig; Exp308; Gulf of Mexico Hydrogeology; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; MARUM A 160 m mostly turbiditic late Pleistocene sediment sequence (IODP Expedition 308, Hole U1319A) from the Brazos-Trinity intraslope basin system off Texas was investigated with paleo- and rock magnetic methods. Numerous layers depleted in iron oxides and enriched by the ferrimagnetic iron-sulfide mineral greigite (Fe3S4) were detected by diagnostic magnetic properties. From the distribution of these layers, their stratigraphic context and the present geochemical zonation, we develop two conceptual reaction models of greigite formation in non-steady depositional environments. The "sulfidization model" predicts single or twin greigite layers by incomplete transformation of iron monosulfides with polysulfides around the sulfate methane transition (SMT). The "oxidation model" explains greigite formation by partial oxidation of iron monosulfides near the iron redox boundary during periods of downward shifting oxidation fronts. The stratigraphic record provides evidence that both these greigite formation processes act here at typical depths of about 12-14 mbsf and 3-4 mbsf. Numerous "fossil" greigite layers most likely preserved by rapid upward shifts of the redox zonation denote past SMT and sea floor positions characterized by stagnant hemipelagic sedimentation conditions. Six diagenetic stages from a pristine magnetite-dominated to a fully greigite-dominated magnetic mineralogy were differentiated by combination of various hysteresis and remanence parameters. |
| title | Geochemical data and magnetic measurements of IODP Expedition 308, Hole U1319A from the Gulf of Mexico |
| topic | 308-U1319A; Center for Marine Environmental Sciences; DRILL; Drilling/drill rig; Exp308; Gulf of Mexico Hydrogeology; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; MARUM |
| url | https://doi.org/10.1594/PANGAEA.733404 |