Waters from the Djiboutian Afar: A Review of Strontium Isotopic Composition and a Comparison with Ethiopian Waters and Red Sea Brines

Boschetti, Tiziano; Awaleh, Mohamed Osman; Barbieri, Maurizio

doi:10.3390/w10111700

Cited by 25 publications

(26 citation statements)

References 66 publications

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“…A lake located in tropical arid zone with scarce rainfall and with apparent lack of riverine water supply from distant wet zones will always provoke the question about its water source. The hypothesis that Lake Asal [a tropical-arid lake with no river supply; Gasse and Fontes (1989)] receives its water from the ocean (via Ghoubbet-al-Kharab) through fissures and faults was suggested long ago (Bäcker et al, 1973) and investigated to some extent recently (Boschetti et al, 2018). In a study of the Holocene (~10 -0 kyr B.P.)…”

Section: Lake Asal: a Lake Fed By Seafloor-type Hydrothermal Fluidsmentioning

confidence: 99%

When a mid-ocean ridge encroaches a continent: Seafloor-type hydrothermal activity in Lake Asal (Afar Rift)

et al. 2021

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Section: Lake Asal: a Lake Fed By Seafloor-type Hydrothermal Fluidsmentioning

confidence: 99%

When a mid-ocean ridge encroaches a continent: Seafloor-type hydrothermal activity in Lake Asal (Afar Rift)

et al. 2021

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“…Thus, the 87 Sr/ 86 Sr isotopic ratio is not a conservative tracer, but instead provides an integrated flow-path signal of water-rock interaction. In this context, Boschetti et al [13] present the 87 Sr/ 86 Sr ratio and Sr concentration data of the groundwater collected to-date in the different regions of Djibouti. This study aims to discriminate between the different water sources, to evaluate the water/rock ratio, and to compare the data with those coming from the groundwater in the neighboring Main Ethiopian Rift and the Red Sea bottom brine.…”

Section: Multi-isotope Studies ( 87 Sr/ 86 Sr 222 Rn and δ 34 S)mentioning

confidence: 99%

Isotopes in Hydrology and Hydrogeology

Barbieri

2019

Water

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The structure, status, and processes of the groundwater system, which can only be acquired through scientific research efforts, are critical aspects of water resource management. Isotope hydrology and hydrogeology is a genuinely interdisciplinary science. It developed from the application of methods evolved in physics (analytical techniques) to problems of Earth and the environmental sciences since around the 1950s. In this regard, starting from hydrogeochemical data, stable and radioactive isotope data provide essential tools in support of water resource management. The inventory of stable isotopes, which has significant implications for water resources management, has grown in recent years. Methodologies based on the use of isotopes in a full spectrum of hydrological problems encountered in water resource assessment, development, and management activities are already scientifically established and are an integral part of many water resource investigations and environmental studies. The driving force behind this Special Issue was the need to point the hydrological and water resource management societies in the direction of up-to-date research and best practices.

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“…Milli-Q water (18.2 MΩ) was used throughout the procedures. High-purity acid was obtained by double distillation of hydrochloric acid and hydrofluoric acid, and the hydrogen peroxide product was electronically pure [31,32].…”

Section: Iron Isotope Analysismentioning

confidence: 99%

Iron Isotopic Composition of Suspended Particulate Matter in Hongfeng Lake

Zheng

Teng

Song

2019

Water

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The geochemical study of iron isotopes is of great significance to deeply understand the surface material circulation process and its environmental effects in surface and subsurface environments. Eutrophication lakes are an important part of the surface and subsurface environment; however, knowledge of the geochemical behavior and fractionation mechanism of iron isotopes in the biogeochemical cycling of eutrophication lakes is still scarce. In this study, a eutrophic lake with seasonal anaerobic characteristics (Hongfeng Lake) was selected as the study object to systematically analyze the iron isotope composition of suspended particles in lake water in different seasons as well as examining suspended particles in the main tributaries, sediments, pore water, planktonic algae, and other samples. The results show that the value of δ56Fe in Hongfeng Lake is between −0.85‰ and +0.14‰, and the value of δ56Fe has a high linear correlation with Fe/Al, indicating that the continental source material carried by the main inflow tributaries of the lake has an important influence on the source of iron in the lake. At the same time, Hongfeng lake is a medium eutrophication lake. Algal bloom and the content of chlorophyll a (Chl-a) is high, combined with the high correlation between Chl-a and the value of δ56Fe, which indicate that the growth of algae has an important influence on the change of iron isotope composition of suspended particles matter (SPM) in lake water and the adsorption and growth absorption of Fe by algae is the main reason for the change of the value of δ56Fe, so Fe isotope can be used to trace the lake’s biological action. For the lake and its inflow tributaries, δ56Fe values are higher in summer than those in winter. And the δ56Fe value of SPM in lake that varies with depth is more obvious in summer than in winter. In addition, there is an obvious thermocline in summer, which leads to hydrochemical stratification. Moreover, according to a linear correlation analysis, the content of DOC (dissolved organic matter) in Hongfeng Lake’s upper and lower waters, respectively, has a high correlation with the value of δ56Fe. Additionally, in the upper water, it is positively correlated, while on the bottom, there is a negative correlation relationship, which indicates that the difference in algae metabolism patterns between the upper and lower water bodies of Hongfeng Lake plays an important role in the iron isotope composition of suspended particulate matters (SPM). The composition of the Fe isotope in SPM is changed by organic adsorption and growth absorption of algae in upper water. With an increase in depth, the degradation process becomes the main one. In addition, the value of δ56Fe is low and Fe/Al is high in the water bottom, which indicates that “ferrous-wheel” cycle form at the bottom of the water.

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Waters from the Djiboutian Afar: A Review of Strontium Isotopic Composition and a Comparison with Ethiopian Waters and Red Sea Brines

Cited by 25 publications

References 66 publications

When a mid-ocean ridge encroaches a continent: Seafloor-type hydrothermal activity in Lake Asal (Afar Rift)

When a mid-ocean ridge encroaches a continent: Seafloor-type hydrothermal activity in Lake Asal (Afar Rift)

Isotopes in Hydrology and Hydrogeology

Iron Isotopic Composition of Suspended Particulate Matter in Hongfeng Lake

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