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Paleoaltimetry of the Western Andes in Northern Chile (∼18.5–19.5°S)
Sebastian Jimenez-Rodriguez, Matthew Dettinger, Jay Quade and Kendra E. Murray

American Journal of Science May 2021, 321 (5) 491-533; DOI: https://doi.org/10.2475/05.2021.01
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Origin and magmatic evolution of late Neoproterozoic post-accretion high-K calc-alkaline adakitic volcanics in the northern Arabian–Nubian Shield
Bassam A. Abuamarah, Mokhles K. Azer and Heba S. Mubarak

American Journal of Science May 2021, 321 (5) 534-578; DOI: https://doi.org/10.2475/05.2021.02
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Terrestrial biomarker isotope records of late Quaternary climate and source-to-sink sediment transport processes in southwestern Taiwan
Queenie Chang, Michael Hren, Andrew T. Lin, Clay Tabor, Shun-Wen Yu, Yvette Eley and Gregory Harris

American Journal of Science April 2021, 321 (4) 393-423; DOI: https://doi.org/10.2475/04.2021.01
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Silurian-Devonian tectonic evolution of mid-coastal Maine, U.S.A.: Details of polyphase orogenic processes
David P. West, Emily M. Peterman and Jessica Chen

American Journal of Science April 2021, 321 (4) 458-489; DOI: https://doi.org/10.2475/04.2021.03
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Thermochemistry of melilites I. Towards resolving an inconsistency in nebular condensation calculations
Richard O. Sack

American Journal of Science April 2021, 321 (4) 424-457; DOI: https://doi.org/10.2475/04.2021.02
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⁴⁰Ar/³⁹Ar and LA-ICP-MS U–Pb geochronology for the New England portion of the Early Cretaceous New England-Quebec igneous province: Implications for the postrift evolution of the eastern North American Margin
Jennifer R. Cooper Boemmels, Jean M. Crespi, Laura E. Webb and Julie C. Fosdick

American Journal of Science March 2021, 321 (3) 365-391; DOI: https://doi.org/10.2475/03.2021.03
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Carbon cycle evolution before and after the Great Oxidation of the atmosphere
Don E. Canfield

American Journal of Science March 2021, 321 (3) 297-331; DOI: https://doi.org/10.2475/03.2021.01
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Unmixing multiple metamorphic muscovite age populations with powder X-ray diffraction and ⁴⁰Ar/³⁹Ar analysis
Ryan J. Mcaleer, David L. Bish, Michael J. Kunk, Peter M. Valley, Gregory J. Walsh and Robert P. Wintsch

American Journal of Science March 2021, 321 (3) 332-364; DOI: https://doi.org/10.2475/03.2021.02
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The complexities of Mesoarchean to late Paleoproterozoic magmatism and metamorphism in the Qixia area, eastern North China Craton: Geology, geochemistry and SHRIMP U-Pb zircon dating
Yusheng Wan, Shoujie Liu, Zhiyong Song, Simon A. Wilde, Laiming Wang, Chunyan Dong, Hangqiang Xie, Shiwen Xie, Jianhua Hou, Wenqian Bai and Dunyi Liu

American Journal of Science January 2021, 321 (1-2) 1-82; DOI: https://doi.org/10.2475/01.2021.01
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Late Paleozoic tectonic transition from subduction to collision in the Chinese Altai and Tianshan (Central Asia): New geochronological constraints
Pengfei Li, Min Sun, Chao Yuan, Fred Jourdan, Wanwan Hu and Yingde Jiang

American Journal of Science January 2021, 321 (1-2) 178-205; DOI: https://doi.org/10.2475/01.2021.05

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