The recent history of the Galapagos triple junction preserved on the Pacific plate
The recent history of the Galapagos triple junction preserved on the Pacific plate
复制标题
太平洋板块上保存的加拉帕戈斯三重交界点的近代历史
DOI:
10.1016/j.epsl.2013.04.018
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发表时间:
2013
影响因子:
5.3
通讯作者:
Zhu, Wenlu
中科院分区:
文献类型:
--
作者:
Smith, Deborah K.;Schouten, Hans;Montési, Laurent;Zhu, Wenlu
At the Galapagos triple junction, the Cocos and Nazca plates are broken by a succession of transient rifts north and south of the Cocos–Nazca (C–N) Rift. Modeling has suggested that each rift initiated at the East Pacific Rise (EPR), its location controlled by the distance of the C–N Rift tip from the EPR. Evidence on the Pacific plate confirms that each transient rift formed a true RRR triple junction with the EPR and clarifies the history of the region. At ∼1.5Ma the triple junctions began jumping rapidly toward the C–N Rift suggesting that the C–N Rift tip moved closer to the EPR. Pacific abyssal hills became broad and shallow indicating enhanced magma supply to the region. At ∼1.4Ma, the Galapagos microplate developed when extension became fixed on the southern transient rift to form the South scarp of the future Dietz rift basin. Lavas flooded the area and a Galapagos–Nazca magmatic spreading center initiated at the EPR. We suggest that a hotspot was approaching the southern triple junction from the west. The hotspot crossed to the Nazca plate ∼1.25Ma. Dietz seamount formed within the young spreading center, dikes intruded Dietz rift basin, and eruptions built volcanic ridges. Since ∼0.8Ma magmatic spreading has jumped northward twice, most recently to Dietz volcanic ridge. Amagmatic extension to the east has formed the large North scarp of Dietz rift basin. Northward jumping of the southern triple junction has maintained the microplate boundary close to the proposed hotspot.
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影响因子:
64.8
作者:
E. Klein;Deborah K. Smith;Clare M. Williams;H. Schouten
通讯作者:
H. Schouten
DOI:
10.1029/jb093ib11p13551
发表时间:
1988-11-10
期刊:
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS
影响因子:
--
作者:
LONSDALE, P
通讯作者:
LONSDALE, P
DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
G. Mitchell;L. Montési;Wen;Deborah K. Smith;H. Schouten
通讯作者:
H. Schouten
DOI:
--
发表时间:
1980
期刊:
影响因子:
--
作者:
L. Zonenshain;L. Kogan;L. Savostin;A.Ja. Golmstock;A. M. Gorodnitskii
通讯作者:
A. M. Gorodnitskii
DOI:
--
发表时间:
1992
期刊:
影响因子:
--
作者:
P. Lonsdale;N. Blum;H. Puchelt
通讯作者:
H. Puchelt