Pub Date : 2026-01-29DOI: 10.1016/j.gca.2026.01.035
Taraneh Roodpeyma, Thomas Driesner, Corey Archer
{"title":"Equilibrium thermodynamics of K-Na exchange between alkali feldspars and aqueous alkali chlorides at 450 °C and 427 bar (0.31 g cm−3 water density)","authors":"Taraneh Roodpeyma, Thomas Driesner, Corey Archer","doi":"10.1016/j.gca.2026.01.035","DOIUrl":"https://doi.org/10.1016/j.gca.2026.01.035","url":null,"abstract":"","PeriodicalId":327,"journal":{"name":"Geochimica et Cosmochimica Acta","volume":"7 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146071695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-29DOI: 10.1016/j.gca.2026.01.040
Yan Ye, Patrick J. Frings, Daniel A. Frick, Friedhelm von Blanckenburg, Qinglai Feng
{"title":"The preservation of silicon isotope ratios in cherts and recrystallized sponge spicules","authors":"Yan Ye, Patrick J. Frings, Daniel A. Frick, Friedhelm von Blanckenburg, Qinglai Feng","doi":"10.1016/j.gca.2026.01.040","DOIUrl":"https://doi.org/10.1016/j.gca.2026.01.040","url":null,"abstract":"","PeriodicalId":327,"journal":{"name":"Geochimica et Cosmochimica Acta","volume":"7 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146071838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-29DOI: 10.1016/j.gca.2026.01.033
Hung-An Tian, Mathijs van Manen, Zach B. Bunnell, Gert-Jan Reichart, Tim M. Conway, Rob Middag
{"title":"Iron isotope constraints on source and transport of sediment-derived dissolved Fe in the Weddell Sea region","authors":"Hung-An Tian, Mathijs van Manen, Zach B. Bunnell, Gert-Jan Reichart, Tim M. Conway, Rob Middag","doi":"10.1016/j.gca.2026.01.033","DOIUrl":"https://doi.org/10.1016/j.gca.2026.01.033","url":null,"abstract":"","PeriodicalId":327,"journal":{"name":"Geochimica et Cosmochimica Acta","volume":"93 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146072708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-27DOI: 10.1016/j.gca.2026.01.038
Yang Yu, Xiao-Long Huang, Betchaida D. Payot, Hai-Quan Liu, Ying-De Jiang, Yu Wang, Carla B. Dimalanta, Xin-Feng Ou, Gabriel Theophilus V. Valera, Fan Yang, Graciano P. Yumul, Yi-Gang Xu, Xiao-Han Tang
{"title":"Ba isotope unmasks recycling processes of fluid mobile elements in subduction zones","authors":"Yang Yu, Xiao-Long Huang, Betchaida D. Payot, Hai-Quan Liu, Ying-De Jiang, Yu Wang, Carla B. Dimalanta, Xin-Feng Ou, Gabriel Theophilus V. Valera, Fan Yang, Graciano P. Yumul, Yi-Gang Xu, Xiao-Han Tang","doi":"10.1016/j.gca.2026.01.038","DOIUrl":"https://doi.org/10.1016/j.gca.2026.01.038","url":null,"abstract":"","PeriodicalId":327,"journal":{"name":"Geochimica et Cosmochimica Acta","volume":"93 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146072699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-24DOI: 10.1016/j.gca.2026.01.027
Simon V. Hohl, Yi-Bo Lin, Philipp Gleissner, Eva E. Stüeken, Yuxiang Jiang, Sebastian Viehmann
{"title":"Combined Ba-Cd isotope tracer in microbialites records biogeochemical metal cycling changes as a response to the Middle Miocene Badenian Salinity Crisis","authors":"Simon V. Hohl, Yi-Bo Lin, Philipp Gleissner, Eva E. Stüeken, Yuxiang Jiang, Sebastian Viehmann","doi":"10.1016/j.gca.2026.01.027","DOIUrl":"https://doi.org/10.1016/j.gca.2026.01.027","url":null,"abstract":"","PeriodicalId":327,"journal":{"name":"Geochimica et Cosmochimica Acta","volume":"386 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146033627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-24DOI: 10.1016/j.gca.2026.01.028
Shane H. Scoggin, Aleisha C. Johnson, Mauricio Ibañez-Mejia, François L.H. Tissot, Valbone Memeti, James B. Chapman, Johannes Hammerli
{"title":"Titanium isotope fractionation during continental batholith construction and its implications for interpreting crustal Ti isotope signatures","authors":"Shane H. Scoggin, Aleisha C. Johnson, Mauricio Ibañez-Mejia, François L.H. Tissot, Valbone Memeti, James B. Chapman, Johannes Hammerli","doi":"10.1016/j.gca.2026.01.028","DOIUrl":"https://doi.org/10.1016/j.gca.2026.01.028","url":null,"abstract":"","PeriodicalId":327,"journal":{"name":"Geochimica et Cosmochimica Acta","volume":"65 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146033628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-24DOI: 10.1016/j.gca.2026.01.030
Xiaoxing Ming, Huaming Guo, Xiaojun Feng, Guangming Chang, Lingzhi Zhang, Yujie Liu, Aina Su, Hailiang Dong
Mechanisms of in-situ silicate weathering along the groundwater flow paths and its contribution to groundwater arsenic (As) in reducing aquifers remain elusive. Elemental contents and lithium isotopic compositions of aquifer sediments and groundwater were used to reveal the mechanisms for in-situ silicate weathering and its effect on As enrichment in groundwater. We found that As concentrations in groundwater were gradually increased from the alluvial fan to the flat plain. The δ<ce:sup loc="post">7</ce:sup>Li values in groundwater also showed an increasing trend. Rocks and aquifer sediments were depleted in heavy Li. The negative correlation between Al/Si ratio and δ<ce:sup loc="post">7</ce:sup>Li values in the aquifer sediments from the transition area and the flat plain indicated that hydrodynamic sorting promoted silicate weathering during riverine transportation, while stable Al/Si ratio, increased Li contents, and decreased δ<ce:sup loc="post">7</ce:sup>Li values from shallow to deep aquifers showed that in-situ silicate weathering was also enhanced in deep aquifer sediments. The negative correlation between <mml:math altimg="si2.svg"><mml:msup><mml:mrow><mml:mtext>Li</mml:mtext></mml:mrow><mml:mo>+</mml:mo></mml:msup></mml:math>/<mml:math altimg="si4.svg"><mml:msup><mml:mrow><mml:mtext>Na</mml:mtext></mml:mrow><mml:mo>+</mml:mo></mml:msup></mml:math> ratio and δ<ce:sup loc="post">7</ce:sup>Li values in groundwater with increased time of water–rock interactions, increased concentrations of <mml:math altimg="si4.svg"><mml:msup><mml:mrow><mml:mtext>Na</mml:mtext></mml:mrow><mml:mo>+</mml:mo></mml:msup></mml:math> and <mml:math altimg="si6.svg"><mml:msup><mml:mrow><mml:mtext>K</mml:mtext></mml:mrow><mml:mo>+</mml:mo></mml:msup></mml:math>, and abundant CO<ce:inf loc="post">2</ce:inf> (averaging 10<ce:sup loc="post">-1.98</ce:sup> atm) along the flow paths demonstrated that in-situ silicate weathering was gradually enhanced from the alluvial fan to the flat plain. Weak in-situ weathering of primary silicates in the alluvial fan was also reflected by the aquifer sediments with low values of chemical index of alteration (CIA) and short time of water–rock interactions, while enhanced in-situ weathering of primary silicates in the transition area and the flat plain was also supported by aquifer sediments with high CIA values and increased time of water–rock interactions. The positive correlation between As concentrations and δ<ce:sup loc="post">7</ce:sup>Li values and the negative correlation between As concentrations and <mml:math altimg="si2.svg"><mml:msup><mml:mrow><mml:mtext>Li</mml:mtext></mml:mrow><mml:mo>+</mml:mo></mml:msup></mml:math>/<mml:math altimg="si4.svg"><mml:msup><mml:mrow><mml:mtext>Na</mml:mtext></mml:mrow><mml:mo>+</mml:mo></mml:msup></mml:math> ratio in groundwater indicated that enhanced in-situ weathering of primary silicates directly mobilized silicates-bound As in the plain. The products (i.e., OH<ce:sup loc="post">–</ce:su
{"title":"Lithium isotopic constraints on enhanced in-situ weathering of primary silicates along the groundwater flow paths: Implications for arsenic release","authors":"Xiaoxing Ming, Huaming Guo, Xiaojun Feng, Guangming Chang, Lingzhi Zhang, Yujie Liu, Aina Su, Hailiang Dong","doi":"10.1016/j.gca.2026.01.030","DOIUrl":"https://doi.org/10.1016/j.gca.2026.01.030","url":null,"abstract":"Mechanisms of in-situ silicate weathering along the groundwater flow paths and its contribution to groundwater arsenic (As) in reducing aquifers remain elusive. Elemental contents and lithium isotopic compositions of aquifer sediments and groundwater were used to reveal the mechanisms for in-situ silicate weathering and its effect on As enrichment in groundwater. We found that As concentrations in groundwater were gradually increased from the alluvial fan to the flat plain. The δ<ce:sup loc=\"post\">7</ce:sup>Li values in groundwater also showed an increasing trend. Rocks and aquifer sediments were depleted in heavy Li. The negative correlation between Al/Si ratio and δ<ce:sup loc=\"post\">7</ce:sup>Li values in the aquifer sediments from the transition area and the flat plain indicated that hydrodynamic sorting promoted silicate weathering during riverine transportation, while stable Al/Si ratio, increased Li contents, and decreased δ<ce:sup loc=\"post\">7</ce:sup>Li values from shallow to deep aquifers showed that in-situ silicate weathering was also enhanced in deep aquifer sediments. The negative correlation between <mml:math altimg=\"si2.svg\"><mml:msup><mml:mrow><mml:mtext>Li</mml:mtext></mml:mrow><mml:mo>+</mml:mo></mml:msup></mml:math>/<mml:math altimg=\"si4.svg\"><mml:msup><mml:mrow><mml:mtext>Na</mml:mtext></mml:mrow><mml:mo>+</mml:mo></mml:msup></mml:math> ratio and δ<ce:sup loc=\"post\">7</ce:sup>Li values in groundwater with increased time of water–rock interactions, increased concentrations of <mml:math altimg=\"si4.svg\"><mml:msup><mml:mrow><mml:mtext>Na</mml:mtext></mml:mrow><mml:mo>+</mml:mo></mml:msup></mml:math> and <mml:math altimg=\"si6.svg\"><mml:msup><mml:mrow><mml:mtext>K</mml:mtext></mml:mrow><mml:mo>+</mml:mo></mml:msup></mml:math>, and abundant CO<ce:inf loc=\"post\">2</ce:inf> (averaging 10<ce:sup loc=\"post\">-1.98</ce:sup> atm) along the flow paths demonstrated that in-situ silicate weathering was gradually enhanced from the alluvial fan to the flat plain. Weak in-situ weathering of primary silicates in the alluvial fan was also reflected by the aquifer sediments with low values of chemical index of alteration (CIA) and short time of water–rock interactions, while enhanced in-situ weathering of primary silicates in the transition area and the flat plain was also supported by aquifer sediments with high CIA values and increased time of water–rock interactions. The positive correlation between As concentrations and δ<ce:sup loc=\"post\">7</ce:sup>Li values and the negative correlation between As concentrations and <mml:math altimg=\"si2.svg\"><mml:msup><mml:mrow><mml:mtext>Li</mml:mtext></mml:mrow><mml:mo>+</mml:mo></mml:msup></mml:math>/<mml:math altimg=\"si4.svg\"><mml:msup><mml:mrow><mml:mtext>Na</mml:mtext></mml:mrow><mml:mo>+</mml:mo></mml:msup></mml:math> ratio in groundwater indicated that enhanced in-situ weathering of primary silicates directly mobilized silicates-bound As in the plain. The products (i.e., OH<ce:sup loc=\"post\">–</ce:su","PeriodicalId":327,"journal":{"name":"Geochimica et Cosmochimica Acta","volume":"7 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146048102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-22DOI: 10.1016/j.gca.2026.01.031
Yinan Zhao, Yuan Yao, Lu Wang, Yunning Cao, Haiwei Zhang, Tingyong Li, Yanjun Cai, Hai Cheng
{"title":"New insights into source of long chain n-alkanes in cave stalagmites","authors":"Yinan Zhao, Yuan Yao, Lu Wang, Yunning Cao, Haiwei Zhang, Tingyong Li, Yanjun Cai, Hai Cheng","doi":"10.1016/j.gca.2026.01.031","DOIUrl":"https://doi.org/10.1016/j.gca.2026.01.031","url":null,"abstract":"","PeriodicalId":327,"journal":{"name":"Geochimica et Cosmochimica Acta","volume":"43 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146033633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：