View in EDS

Environmental Factors Driving Carbonate Distribution in Marine Sediments in the Canary Current Upwelling System.

Saved in:

Bibliographic Details
Title:	Environmental Factors Driving Carbonate Distribution in Marine Sediments in the Canary Current Upwelling System.
Authors:	Nait-Hammou, Hasnaa, El Khalidi, Khalid, Makaoui, Ahmed, Chierici, Melissa, Jamal, Chaimaa, Mejjad, Nezha, Khalfaoui, Otmane, Salhi, Fouad, Idrissi, Mohammed, Zourarah, Bendahhou
Source:	Journal of Marine Science & Engineering; Sep2025, Vol. 13 Issue 9, p1709, 16p
Subject Terms:	CARBONATE minerals, UPWELLING (Oceanography), MARINE sediments, MINERALOGY, OCEAN currents, OCEANOGRAPHY, COASTS, HYDROLOGY
Geographic Terms:	NORTHWEST Africa
Abstract:	This study illustrates the complex interaction between environmental parameters and carbonate distribution in marine sediments along the Tarfaya–Boujdour coastline (26–28° N) of Northwest Africa. Analysis of 21 surface sediment samples and their associated bottom water properties (salinity, temperature, dissolved oxygen, nutrients) reveals CaCO3 content ranging from 16.8 wt.% to 60.5 wt.%, with concentrations above 45 wt.% occurring in multiple stations, especially in nearshore deposits. Mineralogy indicates a general decrease in quartz, with an arithmetic mean and standard deviation of 52.5 wt.% ± 19.8 towards the open sea, and an increase in carbonate minerals (calcite ≤ 24%, aragonite ≤ 10%) with depth. Sediments are predominantly composed of fine sand (78–99%), poorly classified, with gravel content reaching 6.7% in energetic coastal stations. An inverse relationship between organic carbon (0.63–3.23 wt.%) and carbonates is observed in upwelling zones, correlated with nitrate concentrations exceeding 19 μmol/L. Hydrological gradients show temperatures from 12.41 °C (offshore) to 21.62 °C (inshore), salinity from 35.64 to 36.81 psu and dissolved oxygen from 2.06 to 4.21 mL/L. The weak correlation between carbonates and depth (r = 0.10) reflects the balance between three processes: biogenic production stimulated by upwelling, dilution by Saharan terrigenous inputs, and hydrodynamic sorting redistributing bioclasts. These results underline the need for models integrating hydrology, mineralogy and hydrodynamics to predict carbonate dynamics in desert margins under upwelling. [ABSTRACT FROM AUTHOR]
	Copyright of Journal of Marine Science & Engineering is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database:	Complementary Index

Full Text Finder

Nájsť tento článok vo Web of Science

Be the first to leave a comment!