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März, Christian; Beckmann, Britta; Franke, C; Vogt, Christoph; Wagner, Thomas; Kasten, Sabine (2009): Geochemical analysis at ODP Site 207-1259 from the Demerara Rise in the western equatorial Atlantic. PANGAEA, https://doi.org/10.1594/PANGAEA.732377, Supplement to: März, Christian; Beckmann, Britta; Franke, Christine; Vogt, Christoph; Wagner, Thomas; Kasten, Sabine (2009): Geochemical environment of the Coniacian-Santonian western tropical Atlantic at Demerara Rise. Palaeogeography, Palaeoclimatology, Palaeoecology, 273(3-4), 286-301, https://doi.org/10.1016/j.palaeo.2008.05.004

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Abstract:
Organic carbon-rich shales deposited during the Coniacian–Santonian Oceanic Anoxic Event 3 were drilled during ODP Leg 207 at Demerara Rise. We present integrated high-resolution geochemical records of core intervals from ODP Sites 1259 and 1261 both from nannofossil biozone CC14. Our results reveal systematic variations in marine and detrital sediment contribution, depositional processes, and bottom water redox conditions during black shale formation at two locations on Demerara Rise in different paleo-water depths. A combination of redox proxies (Fe/S, P/Al, C/P, redox-sensitive/sulfide-forming trace metals Mn, Cd, Mo, Ni, V, Zn) and other analytical approaches (bulk sediment composition, P speciation, electron microscopy, X-ray diffraction) evidence anoxic to sulfidic bottom water and sediment conditions throughout the deposition of black shale. These extreme redox conditions persisted and were periodically punctuated by short-termed periods with less reducing bottom waters irrespective of paleo-water depth. Sediment supply at both sites was generally dominated by marine material (carbonate, organic matter, opal) although relationships of detrital proxies as well as glauconitic horizons support some influence of turbidites, winnowing bottom currents and/or variable detritus sources, along with less reducing bottom water at the proposed shallower location (ODP Site 1259). At Site 1261, located at greater paleo-depth, redox fluctuations were more regular, and steady hemipelagic sedimentation sustained the development of mostly undisturbed lamination in the sedimentary record. Strong similarities of the studied deposits exist with the stratigraphic older Cenomanian–Turonian OAE2 black shale sections at Demerara Rise, suggesting that the primary mechanisms controlling continental supply and ocean redox state were time-invariant and kept the western equatorial Atlantic margin widely anoxic over millions of years.
Project(s):
Coverage:
Latitude: 9.300400 * Longitude: -54.199517
Date/Time Start: 2003-02-01T00:00:00 * Date/Time End: 2003-02-16T00:00:00
Minimum DEPTH, sediment/rock: 499.605 m * Maximum DEPTH, sediment/rock: 500.615 m
Event(s):
207-1259 * Latitude: 9.300400 * Longitude: -54.199517 * Date/Time Start: 2003-02-01T00:00:00 * Date/Time End: 2003-02-16T00:00:00 * Elevation: -2354.5 m * Penetration: 1668.7 m * Recovery: 644.9 m * Location: South Atlantic Ocean * Campaign: Leg207 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 104 cores; 929.6 m cored; 739.1 m drilled; 69.4 % recovery
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepth sedmGeocode
2Depth, referenceDepth refmMärz, ChristianSection depth
3Depth, referenceDepth refmMärz, ChristianSection depth, corrected
4AluminiumAl%März, ChristianICP-OES, Inductively coupled plasma - optical emission spectrometry
5BoronBmg/kgMärz, ChristianICP-OES, Inductively coupled plasma - optical emission spectrometry
6BariumBamg/kgMärz, ChristianICP-OES, Inductively coupled plasma - optical emission spectrometry
7CalciumCa%März, ChristianICP-OES, Inductively coupled plasma - optical emission spectrometry
8ChromiumCr%März, ChristianICP-OES, Inductively coupled plasma - optical emission spectrometry
9CopperCu%März, ChristianICP-OES, Inductively coupled plasma - optical emission spectrometry
10IronFe%März, ChristianICP-OES, Inductively coupled plasma - optical emission spectrometry
11PotassiumK%März, ChristianICP-OES, Inductively coupled plasma - optical emission spectrometry
12MagnesiumMg%März, ChristianICP-OES, Inductively coupled plasma - optical emission spectrometry
13ManganeseMn%März, ChristianICP-OES, Inductively coupled plasma - optical emission spectrometry
14MolybdenumMomg/kgMärz, ChristianICP-OES, Inductively coupled plasma - optical emission spectrometry
15SodiumNa%März, ChristianICP-OES, Inductively coupled plasma - optical emission spectrometry
16PhosphorusP%März, ChristianICP-OES, Inductively coupled plasma - optical emission spectrometry
17Sulfur, totalTS%März, ChristianICP-OES, Inductively coupled plasma - optical emission spectrometry
18StrontiumSr%März, ChristianICP-OES, Inductively coupled plasma - optical emission spectrometry
19TitaniumTi%März, ChristianICP-OES, Inductively coupled plasma - optical emission spectrometry
20VanadiumVmg/kgMärz, ChristianICP-OES, Inductively coupled plasma - optical emission spectrometry
21ZincZn%März, ChristianICP-OES, Inductively coupled plasma - optical emission spectrometry
22ZirconiumZrmg/kgMärz, ChristianICP-OES, Inductively coupled plasma - optical emission spectrometry
23NickelNi%März, ChristianICP-OES, Inductively coupled plasma - optical emission spectrometry
24Barium/Aluminium ratioBa/AlMärz, ChristianCalculated
25Chromium/Aluminium ratioCr/AlMärz, ChristianCalculated
26Copper/Aluminium ratioCu/AlMärz, ChristianCalculated
27Iron/Aluminium ratioFe/AlMärz, ChristianCalculated
28Potassium/Aluminium ratioK/AlMärz, ChristianCalculated
29Magnesium/Aluminium ratioMg/AlMärz, ChristianCalculated
30Manganese/Aluminium ratioMn/AlMärz, ChristianCalculated
31Molybdenum/Aluminium ratioMo/AlMärz, ChristianCalculated
32Nickel/Aluminium ratioNi/AlMärz, ChristianCalculated
33Phosphorus/Aluminium ratioP/AlMärz, ChristianCalculated
34Sulfur/Aluminium ratioS/AlMärz, ChristianCalculated
35Strontium/Aluminium ratioSr/AlMärz, ChristianCalculated
36Titanium/Aluminium ratioTi/AlMärz, ChristianCalculated
37Vanadium/Aluminium ratioV/AlMärz, ChristianCalculated
38Zinc/Aluminium ratioZn/AlMärz, ChristianCalculated
39Zirconium/Aluminium ratioZr/AlMärz, ChristianCalculated
40Strontium/Calcium ratioSr/CaMärz, ChristianCalculated
41Iron/Sulfur ratioFe/SMärz, ChristianCalculated
42Phosphorus pentoxideP2O5%März, ChristianICP-OES, Inductively coupled plasma - optical emission spectrometry
43Carbon, organic, totalTOC%März, ChristianElement analyser CS, LECO CS-200
44CarbonatesCarb%März, ChristianElement analyser CS, LECO CS-200
45Carbon, organic total/Aluminium ratioTOC/AlMärz, ChristianCalculated
46Calcium/Aluminium ratioCa/AlMärz, ChristianCalculated
Size:
4590 data points

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