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Elemental and isotopic study of Lake...

Sun, Li.

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Elemental and isotopic study of Lake Texoma, Texas-Oklahoma: Solute sources, mixing dynamics and metal cycling.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Elemental and isotopic study of Lake Texoma, Texas-Oklahoma: Solute sources, mixing dynamics and metal cycling./
Author:	Sun, Li.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2015,
Description:	149 p.
Notes:	Source: Dissertations Abstracts International, Volume: 77-01, Section: B.
Contained By:	Dissertations Abstracts International77-01B.
Subject:	Environmental Geology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3707020
ISBN:	9781321812800

Elemental and isotopic study of Lake Texoma, Texas-Oklahoma: Solute sources, mixing dynamics and metal cycling.
Sun, Li.

Elemental and isotopic study of Lake Texoma, Texas-Oklahoma: Solute sources, mixing dynamics and metal cycling. - Ann Arbor : ProQuest Dissertations & Theses, 2015 - 149 p.

Source: Dissertations Abstracts International, Volume: 77-01, Section: B.

Thesis (Ph.D.)--The University of Texas at Dallas, 2015.

This item must not be sold to any third party vendors.

Knowledge of water geochemistry provides important theoretical information for modeling evolution of aqueous systems for developing effective methods for water management and protection. Lake Texoma is a large impoundment on the border of Texas and Oklahoma, formed from the confluence of two river systems with different salinities. This dissertation combines systematic analyses of major and trace elements, stable (C and S) and strontium isotopes in Lake Texoma waters and its catchment area to characterize several aspects of water geochemistry in this lake. (1) Overall, Lake Texoma waters are characterized by Na-Cl-Ca-SO4 type waters with spatial distribution shifting from Na-Cl type to Ca-SO4 type from the Red River arm to main lake to Washita River arm. Vertical and seasonal variations in major and trace elements concentrations indicate major elements in the lake are mainly controlled by different bedrock weathering from the two river systems, whereas trace elements exhibit different distribution patterns in groups associated with inflow input, summer stratification, biological effects and anthropogenic pollution. (2) Lake Texoma Sr isotope composition, Ca/Na and Sr/Ca of river and lake waters are consistent with the majority of the solute load being derived from dissolution of Permian marine chemical sediments, dominantly halite with lesser gypsum. The differences in 87Sr/ 86Sr between filtered and unfiltered aliquots suggest that Sr associated with the suspended load (calcite) is either less radiogenic than the dissolved load or more radiogenic than surface waters but only released to the dissolved pool under deeper reducing conditions below the metalimnion. (3) In summer, dissolved oxygen decreases with depth, whereas dissolved Fe, Mn and HS - show complementary increases in the hypolimnion in Lake Texoma. Summer anoxia is, to a large degree, responsible for Fe and Mn vertical variations, and Fe speciation is controlled by Fe-oxyhydroxide reduction and subsequent pyrite precipitation in sulfide-rich bottom waters. Stable isotope analysis (δ34SCTD and δ13C PDB) in Lake Texoma waters indicates bacterial oxidation of organic matter linked to sulfate reduction in summer. In summary, water geochemistry of Lake Texoma demonstrated complicated patterns of formation and evolution through regional, temporal, and spatial variations, as well as anthropogenic inputs.

ISBN: 9781321812800Subjects--Topical Terms:

1672929
Environmental Geology.

Elemental and isotopic study of Lake Texoma, Texas-Oklahoma: Solute sources, mixing dynamics and metal cycling.
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245 1 0 $a Elemental and isotopic study of Lake Texoma, Texas-Oklahoma: Solute sources, mixing dynamics and metal cycling.
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500 $a Publisher info.: Dissertation/Thesis.
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502 $a Thesis (Ph.D.)--The University of Texas at Dallas, 2015.
506 $a This item must not be sold to any third party vendors.
520 $a Knowledge of water geochemistry provides important theoretical information for modeling evolution of aqueous systems for developing effective methods for water management and protection. Lake Texoma is a large impoundment on the border of Texas and Oklahoma, formed from the confluence of two river systems with different salinities. This dissertation combines systematic analyses of major and trace elements, stable (C and S) and strontium isotopes in Lake Texoma waters and its catchment area to characterize several aspects of water geochemistry in this lake. (1) Overall, Lake Texoma waters are characterized by Na-Cl-Ca-SO4 type waters with spatial distribution shifting from Na-Cl type to Ca-SO4 type from the Red River arm to main lake to Washita River arm. Vertical and seasonal variations in major and trace elements concentrations indicate major elements in the lake are mainly controlled by different bedrock weathering from the two river systems, whereas trace elements exhibit different distribution patterns in groups associated with inflow input, summer stratification, biological effects and anthropogenic pollution. (2) Lake Texoma Sr isotope composition, Ca/Na and Sr/Ca of river and lake waters are consistent with the majority of the solute load being derived from dissolution of Permian marine chemical sediments, dominantly halite with lesser gypsum. The differences in 87Sr/ 86Sr between filtered and unfiltered aliquots suggest that Sr associated with the suspended load (calcite) is either less radiogenic than the dissolved load or more radiogenic than surface waters but only released to the dissolved pool under deeper reducing conditions below the metalimnion. (3) In summer, dissolved oxygen decreases with depth, whereas dissolved Fe, Mn and HS - show complementary increases in the hypolimnion in Lake Texoma. Summer anoxia is, to a large degree, responsible for Fe and Mn vertical variations, and Fe speciation is controlled by Fe-oxyhydroxide reduction and subsequent pyrite precipitation in sulfide-rich bottom waters. Stable isotope analysis (δ34SCTD and δ13C PDB) in Lake Texoma waters indicates bacterial oxidation of organic matter linked to sulfate reduction in summer. In summary, water geochemistry of Lake Texoma demonstrated complicated patterns of formation and evolution through regional, temporal, and spatial variations, as well as anthropogenic inputs.
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