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Sedimentology and structure of a Holocene slump deposit on the continental slope off Baja California, Mexico
- Source :
- Geo-Marine Letters, Geo-Marine Letters, Springer Verlag, 2021, 41 (4), ⟨10.1007/s00367-021-00713-8⟩
- Publication Year :
- 2021
- Publisher :
- Springer Science and Business Media LLC, 2021.
-
Abstract
- A marine sediment core located off the southernmost part of the Baja California Peninsula, NE Pacific, is analyzed to investigate a submarine mass failure. We examine the lithofacies and sedimentary structures, the total organic (TOC) and inorganic (TIC) carbon, the grain size composition, and the degree of fragmentation in foraminifera tests. The core BB03 consists of five lithostratigraphic units, from bottom to top, U1 to U5. Radiocarbon dating (AMS 14C) indicates that this sequence is inverted, where the deepest strata U1–U2 date at ~ 4,162 cal yr BP, U3–U4 at ~ 14,406 cal yr BP, and the shallower strata U5 at ~ 18,759–19,445 cal yr BP. Analysis of core and multibeam bathymetric data evidenced a submarine mass failure of the slump type, characterized by abruptly inverted layers with soft-sediment deformation structures. The event’s timing is constrained both with AMS 14C and the well-known stratigraphic identification of laminated or bioturbated layers in this highly productive upwelling zone. The event occurred during the Late Holocene as constrained by a maximum age of ~ 4,000 years. Although there is no explicit evidence on the cause of the submarine slump, the geomorphic characteristics and the close spatial connection with other submarine mass failures suggest a close relationship with the Tosco-Abreojos fault having acted either as a preconditioning factor or as a triggering mechanism. Finally, this study represents one of the few studies of submarine mass failures at the NE Tropical Pacific margin, aiming to identify how the transported sediments interact with the regional morphology and the formation of modern seafloor structures.
- Subjects :
- 010504 meteorology & atmospheric sciences
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
Environmental Science (miscellaneous)
Fault (geology)
010502 geochemistry & geophysics
Oceanography
01 natural sciences
law.invention
Sedimentary structures
Foraminifera
Paleontology
law
Earth and Planetary Sciences (miscellaneous)
14. Life underwater
Radiocarbon dating
Sedimentology
ComputingMilieux_MISCELLANEOUS
Holocene
0105 earth and related environmental sciences
geography
geography.geographical_feature_category
biology
Continental shelf
Geotechnical Engineering and Engineering Geology
biology.organism_classification
Seafloor spreading
Geology
Subjects
Details
- ISSN :
- 14321157 and 02760460
- Volume :
- 41
- Database :
- OpenAIRE
- Journal :
- Geo-Marine Letters
- Accession number :
- edsair.doi.dedup.....adf1b4166ca9a995cd300b70197a474c