Geochemistry of meteoric diagenesis in carbonate islands of the northern Bahamas: 2. Geochemical modelling and budgeting of diagenesis

AbstractLoss of phosphorus from agricultural land through water runoff causes serious detrimental effects on the environment and on water quality. Phosphorous runoff from excessive use of fertilizers can cause algal blooms to grow in nearby water systems, producing toxins that contaminate drinking water sources and recreational water. In this study, a risk analysis of the algal toxin micro-cystin-LR and the mitigation of phosphorus from agriculture runoff is discussed. A risk analysis was performed on the algal bloom toxin microcystin-LR considering the Lake Erie algal bloom event of 2011 as a case study. Toxicity risk analysis results show that relatively low concentrations of microcystin-LR compared to recent case studies pose an acute health risk to both children and adults, and a significant increase in the risk of developing cancer is suggested but subject to further study given the assumptions made. This study investigated the potential of using wollastonite to mitigate phosphorus pollution, considering thermodynamic conditions of a constructed wetland receiving influent water from agriculture runoff, by using geochemical modelling. Geochemical modelling results show that wollastonite can react with phosphorus and capture it in the stable mineral form of hydroxyapatite, offering a possible strategy for risk mitigation of phosphorous runoff. A removal efficiency of 77% of phosphorus using wollastonite is calculated with the help of geochemical modelling.

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Passive remediation of acid mine drainage using cryptocrystalline magnesite: A batch experimental and geochemical modelling approach

Water SA ◽

10.4314/wsa.v41i5.10 ◽

2015 ◽

Vol 41 (5) ◽

pp. 677 ◽

Cited By ~ 19

Author(s):

Vhahangwele Masindi ◽

Mugera Wilson Gitari ◽

Hlanganani Tutu ◽

Marinda De Beer

Keyword(s):

Acid Mine Drainage ◽

Mine Drainage ◽

Geochemical Modelling ◽

Acid Mine ◽

Passive Remediation ◽

Modelling Approach

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Evaluation of long-term mineral trapping at the Ketzin pilot site for CO2 storage: An integrative approach using geochemical modelling and reservoir simulation

International Journal of Greenhouse Gas Control ◽

10.1016/j.ijggc.2013.05.014 ◽

2013 ◽

Vol 19 ◽

pp. 720-730 ◽

Cited By ~ 42

Author(s):

Elisa Klein ◽

Marco De Lucia ◽

Thomas Kempka ◽

Michael Kühn

Keyword(s):

Reservoir Simulation ◽

Co2 Storage ◽

Geochemical Modelling ◽

Integrative Approach ◽

Pilot Site ◽

Mineral Trapping ◽

Ketzin Pilot Site

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Feldspar crystallization under magma-mixing conditions shown by cathodoluminescence and geochemical modelling – a case study from the Karkonosze pluton (SW Poland)

Mineralogical Magazine ◽

10.1180/0026461046840205 ◽

2004 ◽

Vol 68 (4) ◽

pp. 561-577 ◽

Cited By ~ 44

Author(s):

E. Słaby ◽

J. Götze

Keyword(s):

Magma Mixing ◽

Main Tool ◽

Precise Determination ◽

Geochemical Modelling ◽

Magma Evolution ◽

Sw Poland ◽

Crystallization Path ◽

Geochemical Mass Balance

AbstractFeldspars from the Karkonosze pluton (SW Poland) display many features compatible with magma mixing. The mixing hypothesis has been tested using a geochemical mass balance law resulting in two possible paths of magma hybridization. Based on the results of the geochemical calculation, feldspar samples have been chosen along both mixing lines for cathodoluminescence (CL) investigation which was used as the main tool for the reconstruction of their crystallization path. Changes in the conditions of nucleation and crystallization of the feldspars as well as their movement within the magma chamber have been recognized due to different luminescence characteristics. These changes in the conditions of crystallization obtained by CL allow a precise determination of the genetic affinity of the samples to more mafic or more felsic environments.The results of the present study proved CL to be a valuable tool for the study of crystal-growth morphologies in a dynamic, turbulent environment and also as a geochemical tool for the reconstruction of various petrogenetic mechanisms (e.g. magma hybridization). Accordingly, the combination of CL with geochemical modelling provides corresponding information about magma evolution in an open system.

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