DOI: 10.1007/s00531-013-0953-x
Scopus记录号: 2-s2.0-84902489754
论文题名: The Yucatan, a Laurentian or Gondwanan fragment? Geophysical and palinspastic constraints
作者: Keppie D.F. ; Keppie J.D.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2014
卷: 103, 期: 5 起始页码: 1501
结束页码: 1512
语种: 英语
英文关键词: Gondwana
; Laurentia
; Magnetics
; Pangea
; Yucatan
Scopus关键词: Cambrian
; fauna
; Gondwana
; Laurentia
; mafic rock
; magnetic anomaly
; neodymium isotope
; paleomagnetism
; Pangaea
; pluton
; provenance
; reconstruction
; Belize [Central America]
; Maya Mountains
; Mexico [North America]
; Oklahoma [United States]
; Reelfoot Rift
; United States
; Yucatan
英文摘要: Current reconstructions suggest that the Yucatan block has Gondwanan provenance and orient the Yucatan E-W in the Ouachita embayment where it overlaps southern Laurentia and Florida. Alternatively, if the Yucatan is oriented NE-SW, it fits neatly into the Ouachita embayment with minimal overlap. Furthermore, many of the V-shaped, magnetic anomalies in the Yucatan that are discordant in the E-W reconstruction can be traced across the Yucatan-Laurentian boundary in the NE-SW reconstruction: (a) NW-trending anomalies continue into southern Laurentia where they are associated with Cambrian mafic rocks in the southern Oklahoma and Reelfoot rifts and (b) NE-trending anomalies in the eastern Yucatan are parallel to those over Grenvillian rocks in the western Appalachians. Furthermore, Silurian plutons in the Maya Mountains of Belize that have no counterpart in Texas may be correlated with the Concord-Salisbury plutons in Carolinia, a terrane of Gondwanan provenance in the southern Appalachians. Nd isotopic data from the Chicxulub ejecta in the northern Yucatan block are similar to those in the Llano Grenvillian rocks and differ from those in Oaxaquia. These correlations suggest that much of the Yucatan is of Laurentian provenance and implies that the Laurentia-Gondwana suture crosses the Yucatan west of the Maya Mountains. In this scenario, the Ouachita embayment results from the formation of the Gulf of Mexico during the breakup of Pangea, rather than the Cambrian removal of the Argentine Cuyania terrane. Cambrian (515 Ma) paleomagnetic and faunal data are consistent with Cuyania forming either east of the Yucatan or off eastern Laurentia. © 2013 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84902489754&doi=10.1007%2fs00531-013-0953-x&partnerID=40&md5=4e4448c2a52fc1428fcfb6b65bb048e9
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70356
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Natural Resources, 1701 Hollis St., Halifax, NS, B3J 2T9, Canada; Departamento de Geologia Regional, Instituto de Geologia, Universidad Nacional Autonoma de Mexico, 04510 Mexico D.F., Mexico
Recommended Citation:
Keppie D.F.,Keppie J.D.. The Yucatan, a Laurentian or Gondwanan fragment? Geophysical and palinspastic constraints[J]. International Journal of Earth Sciences,2014-01-01,103(5)