气候变化领域集成服务门户(CCPortal): Kinematic and geodynamic evolution of the Isthmus of Panama region: Implications for Central American Seaway closure

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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).