Fantle, Matthew S; DePaolo, Donald J (2004): Fe isotopic composition in continental iron cycle (Table 1) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.714650, Supplement to: Fantle, MS; DePaolo, DJ (2004): Iron isotopic fractionation during continental weathering. Earth and Planetary Science Letters, 228(3-4), 547-562, https://doi.org/10.1016/j.epsl.2004.10.013
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Abstract:
The effect of continental weathering on the iron isotope compositions of natural materials is investigated. Unweathered igneous rocks, pelagic clay, and dust fall within the range delta56Fe=0 +/- 0.3 per mil. Rivers with large suspended loads also have delta56Fe values near zero. Dilute streams have delta56Fe values that trend towards lower delta56Fe (~-1) suggesting that dissolved riverine iron is isotopically light relative to igneous rocks. Bulk soil and soil leaches display systematically different delta56Fe profiles, indicating that isotopically distinct Fe pools are generated during pedogenesis. Nannofossil ooze, which contains Fe scavenged from the ocean water column, has delta56Fe c. 0, but is consistent with seawater dissolved Fe having negative delta56Fe. It is inferred that continental weathering under modern oxidizing Earth surface conditions preferentially releases dissolved Fe with negative delta56Fe, which is transported in rivers to the ocean. A preliminary analysis of the marine Fe budget suggests that riverine Fe has a substantial role in determining the delta56Fe of both the modern and ancient oceans, but other inputs, particularly that from diagenesis of marine sediments, may also be important. Since the chemical pathways of Fe processing during weathering are dependent on oxidation state and biological activity, Fe isotopes may prove useful for detecting changes in these parameters in the geologic past.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -0.417650 * Median Longitude: -177.236600 * South-bound Latitude: -31.167000 * West-bound Longitude: 163.358500 * North-bound Latitude: 30.331700 * East-bound Longitude: -157.831700
Date/Time Start: 1982-12-15T00:00:00 * Date/Time End: 1982-12-15T00:00:00
Minimum DEPTH, sediment/rock: 0.25 m * Maximum DEPTH, sediment/rock: 12.09 m
Event(s):
90-590B * Latitude: -31.167000 * Longitude: 163.358500 * Date/Time: 1982-12-15T00:00:00 * Elevation: -1299.0 m * Penetration: 499.1 m * Recovery: 464.6 m * Location: South Pacific/Tasman Sea/CONT RISE * Campaign: Leg90 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 53 cores; 499.1 m cored; 0 m drilled; 93.1 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | AGE | Age | ka BP | Geocode | ||
| 3 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 4 | Sample code/label | Sample label | Fantle, Matthew S | DSDP/ODP/IODP sample designation | ||
| 5 | δ56Fe | δ56Fe | ‰ | Fantle, Matthew S | Thermal Ionization Mass Spectrometry (TIMS) | |
| 6 | δ56Fe, standard deviation | δ56Fe std dev | ± | Fantle, Matthew S | Thermal Ionization Mass Spectrometry (TIMS) | 2 sigma |
| 7 | Number | No | Fantle, Matthew S |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
20 data points