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Natl. Acad. Sci. U.S.A."],"published-print":{"date-parts":[[2025,7,8]]},"abstract":"<jats:p>\n                    Solar system gravitational interactions are embedded in Earth\u2019s record of climate, providing a way to bypass the 60 Myr limit imposed by chaos. Presently with a 2.4 Myr period, the Mars\u2013Earth beat cycle of orbital perihelion frequencies is particularly sensitive to chaotic diffusion, potentially varying by more than a million years. Early Mesozoic (252 to 145 Ma) strata provide some constraints on this cycle, with evidence of a swing through most of the solution space from 1.8 Myr at 210 Ma to 2.5 Myr at 190 Ma and back to 1.6 Myr at 180 Ma. However, only the 1.8 Myr cycle is corroborated by geochronologic data and the 1.6 Myr period is disputed. Here, we show that variations in land-plant-dominated stable carbon isotopic ratios (\u03b4\n                    <jats:sup>13<\/jats:sup>\n                    C\n                    <jats:sub>org<\/jats:sub>\n                    ) from the lacustrine, paleo-high-latitude Sangonghe Formation (Junggar Basin, northwestern China), reveal at least three 1.6 Myr Mars\u2013Earth beat cycles centered at 183 Ma, tracking atmospheric CO\n                    <jats:sub>2<\/jats:sub>\n                    isotopic composition in Earth\u2019s exchangeable carbon reservoirs. Furthermore, the middle cycle includes the famous Jenkyns Event, expressed here by poleward migration of cheirolepidaceous conifers driven by CO\n                    <jats:sub>2<\/jats:sub>\n                    warming from the Karoo-Ferrar large igneous province (LIP). Our data do not, however, support major, LIP-triggered input of isotopically light carbon and instead support CO\n                    <jats:sub>2<\/jats:sub>\n                    amplification of local processes via warming and ecosystem change. Although requiring additional independent geochronological support, Sangonghe data help provide empirical constraints for filtering orbital solutions, tightening initial conditions, and testing gravitational models, as well as showing how extrinsic cyclical processes interact with a tectonic event, the Karoo-Ferrar LIP.\n                  <\/jats:p>","DOI":"10.1073\/pnas.2419902122","type":"journal-article","created":{"date-parts":[[2025,6,30]],"date-time":"2025-06-30T15:45:31Z","timestamp":1751298331000},"update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":6,"title":["Jurassic constraints on the chaotic Mars\u2013Earth eccentricity cycle linked to the volcanically induced Jenkyns event"],"prefix":"10.1073","volume":"122","author":[{"given":"Yanan","family":"Fang","sequence":"first","affiliation":[{"name":"State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences","place":["Nanjing, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5852-6326","authenticated-orcid":false,"given":"Paul E.","family":"Olsen","sequence":"additional","affiliation":[{"name":"Department of Earth and Environmental Sciences and Biology and Paleo Environment Division, Lamont-Doherty Earth Observatory of Columbia University","place":["Palisades"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9307-0627","authenticated-orcid":false,"given":"Jingeng","family":"Sha","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences","place":["Nanjing, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jessica H.","family":"Whiteside","sequence":"additional","affiliation":[{"name":"Department of Earth and Environmental Sciences, San Diego State University","place":["San Diego"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chengguo","family":"Guan","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences","place":["Nanjing, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Masayuki","family":"Ikeda","sequence":"additional","affiliation":[{"name":"Department of Earth and Planetary Science, University of Tokyo","place":["Tokyo, Japan"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sha","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences","place":["Nanjing, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daran","family":"Zheng","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences","place":["Nanjing, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4553-8317","authenticated-orcid":false,"given":"Haichun","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences","place":["Nanjing, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8001-9937","authenticated-orcid":false,"given":"Bo","family":"Wang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences","place":["Nanjing, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"341","published-online":{"date-parts":[[2025,6,30]]},"reference":[{"key":"e_1_3_4_1_2","first-page":"237","article-title":"A numerical experiment on the chaotic behaviour of the solar system","volume":"338","author":"Laskar J.","year":"1989","unstructured":"J. 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Xu , Molecular and petrographical evidence for lacustrine environmental and biotic change in the palaeo-Sichuan mega-lake (China) during the Toarcian Oceanic Anoxic Event (Geological Society, London, 2021).","journal-title":"Molecular and petrographical evidence for lacustrine environmental and biotic change in the palaeo-Sichuan mega-lake (China) during the Toarcian Oceanic Anoxic Event"},{"key":"e_1_3_4_56_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.gloplacha.2020.103273"},{"key":"e_1_3_4_57_2","doi-asserted-by":"publisher","DOI":"10.5194\/cp-12-1151-2016"},{"key":"e_1_3_4_58_2","doi-asserted-by":"publisher","DOI":"10.5194\/cp-14-303-2018"},{"key":"e_1_3_4_59_2","doi-asserted-by":"publisher","DOI":"10.1130\/G52131.1"},{"key":"e_1_3_4_60_2","doi-asserted-by":"publisher","DOI":"10.1126\/science.aax0612"},{"key":"e_1_3_4_61_2","doi-asserted-by":"crossref","unstructured":"R. E. Zeebe M. 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