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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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Late Neoarchean magmatic – metamorphic event and crustal stabilization in the North China Craton
Mingguo Zhai, Lei Zhao, Xiyan Zhu, Yanyan Zhou, Peng Peng, Jinghui Guo, Qiuli Li, Taiping Zhao, Junsheng Lu and Xianhua Li

American Journal of Science January 2021, 321 (1-2) 206-234; DOI: https://doi.org/10.2475/01.2021.06
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SHRIMP U-Pb dating of detrital zircons from the Permian sandstones along the southern and northern margins of Xar Moron River, central inner Mogolia: Implications for provenance and the tectonic evolution of the eastern segment of the Central Asian Orogenic Belt
Xiancan Wu, Yuruo Shi and J. Lawford Anderson

American Journal of Science January 2021, 321 (1-2) 152-177; DOI: https://doi.org/10.2475/01.2021.04
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This Issue Is Dedicated To The Memory Of Distinguished Scientist Alfred Kroner Who Sadly Passed Away On 22 May 2019
Simon A. Wilde, Shoujie Liu, Yamirka Rojas-Agramonte and Guochun Zhao

American Journal of Science January 2021, 321 (1-2) vii-xi; DOI: https://doi.org/10.2475/01.2021.08
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Foreword
American Journal of Science January 2021, 321 (1-2) xii-xiii; DOI: https://doi.org/10.2475/01.2021.09
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Unravelling the P-T-t history of three high-grade metamorphic events in the Epupa Complex, NW Namibia: Implications for the Paleoproterozoic to Mesoproterozoic evolution of the Congo Craton
Sönke Brandt, Reiner Klemd, Hanqiang Xie and Patrick Bobek

American Journal of Science January 2021, 321 (1-2) 235-296; DOI: https://doi.org/10.2475/01.2021.07

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