{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/107989"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/107989","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Stable isotope and trace element fractionation and implications for chemical weathering rates","abstract":"The student, Nicole Fernandez-Franzan, accepted the attached license on 2020-05-05 at 04:05.","abstract_html":"The student, Nicole Fernandez-Franzan, accepted the attached license on 2020-05-05 at 04:05.","abstract_has_math":false,"creators":["Fernandez-Franzan, Nicole Marie"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Geology","degree_department":null,"school":null,"contributors":["Druhan, Jennifer L","Johnson, Thomas M","Best, James L","Sanford, Robert A"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2020,"date_issued":"2020-08-26T21:54:53Z","date_published":"2020-08-26T21:54:53Z","updated_at":"2026-07-22T22:24:47Z","subjects":["Isotope geochemistry","Hydrogeology","Chemical weathering","Reactive transport modeling"],"languages":["en"],"rights":["Copyright 2020 Nicole Fernandez-Franzan"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/107989","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Druhan, Jennifer L","Johnson, Thomas M","Best, James L","Sanford, Robert A"]},{"key":"dc:creator","label":"Author","values":["Fernandez-Franzan, Nicole Marie"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2020-08-26T21:54:53Z","2020-05-06","2020-05"]},{"key":"dc:type","label":"Dc Type","values":["text","Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Geology"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Isotope geochemistry","Hydrogeology","Chemical weathering","Reactive transport modeling"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2020 Nicole Fernandez-Franzan"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/107989"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The student, Nicole Fernandez-Franzan, accepted the attached license on 2020-05-05 at 04:05.","The student, Nicole Fernandez-Franzan, submitted this Dissertation for approval on 2020-05-05 at 04:26.","This Dissertation was approved for publication on 2020-05-06 at 09:04.","DSpace SAF Submission Ingestion Package generated from Vireo submission #15207 on 2020-08-25 at 17:12:05","Application of stable isotopes and trace-element environmental tracers offers a promising approach in characterizing the underlying geochemical and hydrological processes giving rise to observed chemical weathering rates. Yet, to fully leverage these geochemical tools a better understanding of the fundamental mechanisms driving observed signatures is essential. This dissertation builds upon our current knowledge of stable isotope and trace element fractionation in low temperature, terrestrial environments through a combination of highly constrained laboratory experiments, geochemical models, and field analyses. Through this research, the extent of water–rock interactions and rate dependence of stable isotope and trace element fractionation during secondary mineral formation (a key fractionation pathway in weathering systems) is investigated. Further, the potential of stable Si isotopes to complement concentration –discharge relationships is explored through the development of a global dataset of silicon stable isotope–discharge relationships encompassing different lithologies and climates. Major findings from this thesis can be summarized as follows. First, metal stable isotopes and trace elements appear to be dependent on a variety of physio-chemical properties such as mineral surface area, solid to fluid ratios, and fluid solute compositions. Second, silicon, calcium, and strontium stable isotopes and germanium, strontium trace element ratios show a common, broadly consistent relationship between reaction rate and fractionation. Finally, the Si stable isotopes of stream water as a function of discharge are found to be sensitive to site-specific hydrogeochemical processes and are effective tracers of weathering intensity.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2020-08-25 without embargo terms","Made available in DSpace on 2020-08-26T21:54:53Z (GMT). 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Yet, to fully leverage these geochemical tools a better understanding of the fundamental mechanisms driving observed signatures is essential. This dissertation builds upon our current knowledge of stable isotope and trace element fractionation in low temperature, terrestrial environments through a combination of highly constrained laboratory experiments, geochemical models, and field analyses. Through this research, the extent of water–rock interactions and rate dependence of stable isotope and trace element fractionation during secondary mineral formation (a key fractionation pathway in weathering systems) is investigated. Further, the potential of stable Si isotopes to complement concentration –discharge relationships is explored through the development of a global dataset of silicon stable isotope–discharge relationships encompassing different lithologies and climates. Major findings from this thesis can be summarized as follows. First, metal stable isotopes and trace elements appear to be dependent on a variety of physio-chemical properties such as mineral surface area, solid to fluid ratios, and fluid solute compositions. Second, silicon, calcium, and strontium stable isotopes and germanium, strontium trace element ratios show a common, broadly consistent relationship between reaction rate and fractionation. Finally, the Si stable isotopes of stream water as a function of discharge are found to be sensitive to site-specific hydrogeochemical processes and are effective tracers of weathering intensity.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2020-08-25 without embargo terms","Made available in DSpace on 2020-08-26T21:54:53Z (GMT). No. of bitstreams: 2 FERNANDEZ-FRANZAN-DISSERTATION-2020.pdf: 15922756 bytes, checksum: 0df1601f9eb02d16a49b3c2d44c216d2 (MD5) LICENSE.txt: 4221 bytes, checksum: a6ddad0b4db5f0c7995ffe8c2c7d0747 (MD5) Previous issue date: 2020-05-06"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/107989"],"dc:language":["en"],"dc:rights":["Copyright 2020 Nicole Fernandez-Franzan"],"dc:subject":["Isotope geochemistry","Hydrogeology","Chemical weathering","Reactive transport modeling"],"dc:title":["Stable isotope and trace element fractionation and implications for chemical weathering rates"],"dc:type":["text","Thesis"],"thesis:degree_discipline":["Geology"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:47Z"}