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The kabr El-Bonaya peridotites, Southeastern Sinai, Egypt: petrology, geochemistry, and metamorphism of Neoproterozoic arc ultramafic cumulates
Ayman E. Maurice, Mokhles K. Azer, Paul D. Asimow, Fawzy F. Basta, Hassan M. Helmy and Tomoyuki Shibata

American Journal of Science December 2021, 321 (10) 1445-1496; DOI: https://doi.org/10.2475/10.2021.02
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The role of the solid earth in regulating atmospheric O₂ levels
Daniel A. Stolper, John A. Higgins and Louis A. Derry

American Journal of Science December 2021, 321 (10) 1381-1444; DOI: https://doi.org/10.2475/10.2021.01
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Neoarchean basement, mantle enrichment and crustal extraction in central Asia: petrogenesis of 2.5 Ga amphibolite and metadiorite in NE China
Huichuan Liu, Jun Shao, Guangyou Zhu and Yinglei Li

American Journal of Science November 2021, 321 (9) 1350-1379; DOI: https://doi.org/10.2475/09.2021.03
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Coexisting arc and MORB signatures in the Sonakhan greenstone belt, India: late Neoarchean – early Proterozoic subduction rollback and back-arc formation
Gautam Kumar Deb, Dilip Saha, Sarbani Patranabis-Deb and Amlan Banerjee

American Journal of Science November 2021, 321 (9) 1308-1349; DOI: https://doi.org/10.2475/09.2021.02
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Early Cretaceous solar cycles recorded in lacustrine laminations in North China
Xing Tian, Yuan Gao, Tyler Kukla, Olaf Lenz, He Huang, Daniel E. Ibarra, Shouliang Sun and Chengshan Wang

American Journal of Science November 2021, 321 (9) 1285-1307; DOI: https://doi.org/10.2475/09.2021.01
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Metal isotopes as markers of biogeochemical processes and fluxes in the eroding Critical Zone
C. Page Chamberlain

American Journal of Science October 2021, 321 (8) iii-iv; DOI: https://doi.org/10.2475/08.2021.05
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Interpreting silicon isotopes in the Critical Zone
Patrick J. Frings, Marcus Oelze, Franziska Schubring, Daniel A. Frick and Friedhelm von Blanckenburg

American Journal of Science October 2021, 321 (8) 1164-1203; DOI: https://doi.org/10.2475/08.2021.02
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Rock weathering and nutrient cycling along an erodosequence
Friedhelm von Blanckenburg, Jan A. Schuessler, Julien Bouchez, Patrick J. Frings, David Uhlig, Marcus Oelze, Daniel A. Frick, Tilak Hewawasam, Jeannie Dixon and Kevin Norton

American Journal of Science October 2021, 321 (8) 1111-1163; DOI: https://doi.org/10.2475/08.2021.01
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Quantifying biotic and abiotic Si fluxes in the Critical Zone with Ge/Si ratios along a gradient of erosion rates
Patrick J. Frings, Franziska Schubring, Marcus Oelze and Friedhelm von Blanckenburg

American Journal of Science October 2021, 321 (8) 1204-1245; DOI: https://doi.org/10.2475/08.2021.03
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The role of vegetation in setting strontium stable isotope ratios in the Critical Zone
Julien Bouchez and Friedhelm von Blanckenburg

American Journal of Science October 2021, 321 (8) 1246-1283; DOI: https://doi.org/10.2475/08.2021.04

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