Timothy Paulsen , Jeffrey Benowitz , Stuart Thomson , John Encarnación , Anne Grunow , Paul Layer , Maddie Young
{"title":"从热年代学看横跨南极盆地的南极显生宙景观演化","authors":"Timothy Paulsen , Jeffrey Benowitz , Stuart Thomson , John Encarnación , Anne Grunow , Paul Layer , Maddie Young","doi":"10.1016/j.epsl.2025.119445","DOIUrl":null,"url":null,"abstract":"<div><div>Geophysical studies reveal a rugged landscape underlying the Antarctic ice sheets, but the geologic factors that led to this highly variable bedrock topography remain unresolved. Subsidence of Transantarctic Mountains crust, induced, for example, by long-term crustal extension before Cenozoic exhumation and Cretaceous–Cenozoic rifting, has been previously inferred from geologic and thermochronological records. There are, however, uncertainties about the thermochronological history of basement rocks in the Transantarctic Mountains, particularly for the Paleozoic following the late Neoproterozoic to early Paleozoic Ross-Delamerian orogeny. Here we show that K-feldspar <sup>40</sup>Ar/<sup>39</sup>Ar cooling ages (∼350–150 °C closure temperature) from granitoid bodies collected from a large region across the Transantarctic Mountains are consistent with local punctuated exhumation of basement highs in the Silurian–Devonian, Carboniferous–Triassic, and Cretaceous–Paleocene. Times of increased exhumation correlate with periods of erosion and nearby sedimentation, including the Late Paleozoic Ice Age glaciation. They also correlate with the known timing of outboard plate-margin tectonism, suggesting the presence of dynamic inboard Paleozoic-Mesozoic landscapes influenced by cycles of crustal deformation and possibly, glaciation along the Pacific-Gondwana margin. The results indicate a geologic history like Antarctica’s contiguous margin in eastern Australia and highlight the importance of collecting comprehensive time-temperature data to fully understand the evolution of bedrock relief. The data suggest similar thermochronological analyses of subglacial bedrock of East Antarctica and submarine rocks of the West Antarctic rift system have significant potential to provide new insight into the origin of Antarctica’s subglacial bedrock topography and its potential influence on Paleozoic and Cenozoic glacial cycles.</div></div>","PeriodicalId":11481,"journal":{"name":"Earth and Planetary Science Letters","volume":"664 ","pages":"Article 119445"},"PeriodicalIF":4.8000,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Antarctic Phanerozoic landscape evolution along the Transantarctic basin from thermochronology\",\"authors\":\"Timothy Paulsen , Jeffrey Benowitz , Stuart Thomson , John Encarnación , Anne Grunow , Paul Layer , Maddie Young\",\"doi\":\"10.1016/j.epsl.2025.119445\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Geophysical studies reveal a rugged landscape underlying the Antarctic ice sheets, but the geologic factors that led to this highly variable bedrock topography remain unresolved. Subsidence of Transantarctic Mountains crust, induced, for example, by long-term crustal extension before Cenozoic exhumation and Cretaceous–Cenozoic rifting, has been previously inferred from geologic and thermochronological records. There are, however, uncertainties about the thermochronological history of basement rocks in the Transantarctic Mountains, particularly for the Paleozoic following the late Neoproterozoic to early Paleozoic Ross-Delamerian orogeny. Here we show that K-feldspar <sup>40</sup>Ar/<sup>39</sup>Ar cooling ages (∼350–150 °C closure temperature) from granitoid bodies collected from a large region across the Transantarctic Mountains are consistent with local punctuated exhumation of basement highs in the Silurian–Devonian, Carboniferous–Triassic, and Cretaceous–Paleocene. Times of increased exhumation correlate with periods of erosion and nearby sedimentation, including the Late Paleozoic Ice Age glaciation. They also correlate with the known timing of outboard plate-margin tectonism, suggesting the presence of dynamic inboard Paleozoic-Mesozoic landscapes influenced by cycles of crustal deformation and possibly, glaciation along the Pacific-Gondwana margin. The results indicate a geologic history like Antarctica’s contiguous margin in eastern Australia and highlight the importance of collecting comprehensive time-temperature data to fully understand the evolution of bedrock relief. The data suggest similar thermochronological analyses of subglacial bedrock of East Antarctica and submarine rocks of the West Antarctic rift system have significant potential to provide new insight into the origin of Antarctica’s subglacial bedrock topography and its potential influence on Paleozoic and Cenozoic glacial cycles.</div></div>\",\"PeriodicalId\":11481,\"journal\":{\"name\":\"Earth and Planetary Science Letters\",\"volume\":\"664 \",\"pages\":\"Article 119445\"},\"PeriodicalIF\":4.8000,\"publicationDate\":\"2025-05-21\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Earth and Planetary Science Letters\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0012821X25002444\",\"RegionNum\":1,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"GEOCHEMISTRY & GEOPHYSICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Earth and Planetary Science Letters","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0012821X25002444","RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}
Antarctic Phanerozoic landscape evolution along the Transantarctic basin from thermochronology
Geophysical studies reveal a rugged landscape underlying the Antarctic ice sheets, but the geologic factors that led to this highly variable bedrock topography remain unresolved. Subsidence of Transantarctic Mountains crust, induced, for example, by long-term crustal extension before Cenozoic exhumation and Cretaceous–Cenozoic rifting, has been previously inferred from geologic and thermochronological records. There are, however, uncertainties about the thermochronological history of basement rocks in the Transantarctic Mountains, particularly for the Paleozoic following the late Neoproterozoic to early Paleozoic Ross-Delamerian orogeny. Here we show that K-feldspar 40Ar/39Ar cooling ages (∼350–150 °C closure temperature) from granitoid bodies collected from a large region across the Transantarctic Mountains are consistent with local punctuated exhumation of basement highs in the Silurian–Devonian, Carboniferous–Triassic, and Cretaceous–Paleocene. Times of increased exhumation correlate with periods of erosion and nearby sedimentation, including the Late Paleozoic Ice Age glaciation. They also correlate with the known timing of outboard plate-margin tectonism, suggesting the presence of dynamic inboard Paleozoic-Mesozoic landscapes influenced by cycles of crustal deformation and possibly, glaciation along the Pacific-Gondwana margin. The results indicate a geologic history like Antarctica’s contiguous margin in eastern Australia and highlight the importance of collecting comprehensive time-temperature data to fully understand the evolution of bedrock relief. The data suggest similar thermochronological analyses of subglacial bedrock of East Antarctica and submarine rocks of the West Antarctic rift system have significant potential to provide new insight into the origin of Antarctica’s subglacial bedrock topography and its potential influence on Paleozoic and Cenozoic glacial cycles.
期刊介绍:
Earth and Planetary Science Letters (EPSL) is a leading journal for researchers across the entire Earth and planetary sciences community. It publishes concise, exciting, high-impact articles ("Letters") of broad interest. Its focus is on physical and chemical processes, the evolution and general properties of the Earth and planets - from their deep interiors to their atmospheres. EPSL also includes a Frontiers section, featuring invited high-profile synthesis articles by leading experts on timely topics to bring cutting-edge research to the wider community.