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DOI | 10.1130/B35595.1 |
Kinematic and geodynamic evolution of the Isthmus of Panama region: Implications for Central American Seaway closure | |
McGirr R.; Seton M.; Williams S. | |
发表日期 | 2021 |
ISSN | 167606 |
起始页码 | 867 |
结束页码 | 884 |
卷号 | 133期号:2021-03-04 |
英文摘要 | A major topic of debate in earth science and climate science surrounds the timing of closure of the Central American Seaway. While it is clear that the gateway was closed by ca. 2.8 Ma, recent studies based on geological and marine molecular evidence have suggested an earlier closing time of early to mid-Miocene. In this study, we examined the influences of subduction and slab window formation on the time-varying paleoenvironments of the Isthmus of Panama region. We developed detailed reconstructions of the seafloor spreading history in the Panama Basin and incorporated previously published arc block rotations into a revised global plate model. Our reconstructions indicate that the Central American Seaway region has undergone multiple phases of slab window formation and migration, slab detachment, and flat slab subduction since the Oligocene, while kinematically mapped slab windows agree well with slab gaps imaged in seismic tomography. In particular, we found that from the early Miocene, when there is clear evidence for Isthmus of Panama emergence, the region was underlain by a slab window. During the late Miocene, when there is evidence for intermittent arc deepening, and decreased transcontinental migration, we found an increase in subducted slab volumes beneath the Panama arc. Numerical and analogue models and field observations argue that slab windows can induce >1 km of vertical uplift on the overriding plate. We therefore propose that this previously unexplored geodynamic mechanism can explain the variations in Isthmus of Panama emergence, and intermittent shallow-water connections, reconciling alternative lines of evidence for Central American Seaway closure. © 2020. Geological Society of America. |
语种 | 英语 |
来源期刊 | Bulletin of the Geological Society of America |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/184708 |
作者单位 | EarthByte Group, School of Geosciences, University of Sydney, Sydney, NSW 2006, Australia; Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia; State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an, 710069, China |
推荐引用方式 GB/T 7714 | McGirr R.,Seton M.,Williams S.. Kinematic and geodynamic evolution of the Isthmus of Panama region: Implications for Central American Seaway closure[J],2021,133(2021-03-04). |
APA | McGirr R.,Seton M.,&Williams S..(2021).Kinematic and geodynamic evolution of the Isthmus of Panama region: Implications for Central American Seaway closure.Bulletin of the Geological Society of America,133(2021-03-04). |
MLA | McGirr R.,et al."Kinematic and geodynamic evolution of the Isthmus of Panama region: Implications for Central American Seaway closure".Bulletin of the Geological Society of America 133.2021-03-04(2021). |
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