Archive · collection · 2015
Maastrichtian foraminifera and element analysis of ODP Hole 171-1050C
Listed in PANGAEA
Milankovitch-scale alternations in Maastrichtian hemipelagic strata from Ocean Drilling Program Hole 1050C (Blake Nose) provide a natural experiment of paleoceanography and foraminiferal paleoecology in a tropical/subtropical greenhouse ocean.
Description
Cycles are 30-50 cm thick and thought to reflect the ~21 kyr precessional cycle. High planktic d18O values are correlated with high planktic but low benthic d13C values, indicating that cooler and/or more saline surface waters were associated with higher productivity.
High-productivity intervals are also characterized by high Ca concentrations; enrichment in feldspar and kaolinite; and high relative abundance of Heterohelix spp., Globigerinelloides spp., and Laeviheterohelix glabrans. Conversely, low-productivity intervals have low planktic d18O values; high Fe and Ti concentrations; enrichment in quartz, illite, and chlorite; and relative increases in Globotruncana spp. and Pseudoguembelina spp.
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Potential forcing mechanisms for observed covariation include cyclic variation in water column stratification, variation in continental nutrient fluxes, and changes in the intensity of upwelling.
Links
Where it is published
- DOI doi.org/10.1594/pangaea.847737 ↗
DOI / persistent id · from PANGAEA
Catalogue records · 1
- OAI-PMH record ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=oai_dc&identifier=o… ↗
metadata API · from PANGAEA
Topics
- From keywords
- Earth & Environmental Science
- Inferred from text
- Geology 70%
Provenance · 1 source records, 8 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| PANGAEA | oai:pangaea.de:doi:10.1594/PANGAEA.847737 | 12 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · PANGAEA | connector:pangaea@1.0.0 | |
| concepts[field].anzsrc:group:3705 | enrichment · PANGAEA | taxonomy-embedding@1.1.0 | title+keywords+description (70%) |
| concepts[field].local:field:earth-environmental | mapping · PANGAEA | connector:pangaea@1.0.0 | |
| description | source · PANGAEA | connector:pangaea@1.0.0 | /metadata/dc/description |
| license | source · PANGAEA | connector:pangaea@1.0.0 | /metadata/dc/rights |
| publication_date | source · PANGAEA | connector:pangaea@1.0.0 | |
| spatial | source · PANGAEA | connector:pangaea@1.0.0 | |
| title | source · PANGAEA | connector:pangaea@1.0.0 | /metadata/dc/title |