The island of Maupiti: the oldest emergent volcano in the Society hot spot chain (French Polynesia)

被引:23
作者
Blais, S [1 ]
Guille, G
Guillou, H
Chauvel, C
Maury, RC
Pernet, G
Cotten, J
机构
[1] Univ Rennes 1, UMR 6118, F-35042 Rennes, France
[2] CEA, DASE, F-91680 Bruyeres Le Chatel, France
[3] CEA, CNRS, LSCE, F-91198 Gif Sur Yvette, France
[4] LGCA, F-38041 Grenoble, France
[5] Univ Bretagne Occidentale, UMR 6538, F-29285 Brest, France
来源
BULLETIN DE LA SOCIETE GEOLOGIQUE DE FRANCE | 2002年 / 173卷 / 01期
关键词
intraplate volcanism; basalt; mugearite; benmoreite; fractional crystallisation; French Polynesia; South Pacific;
D O I
10.2113/173.1.45
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The island of Maupiti is the top of an eroded volcanic shield surrounded by a large lagoon and coral reef. The most important part of this shield is made up of alkali basaltic lavas grading upward into hawaiitic flows. The shield-building event is dated at ca. 4.51 +/- 0.04 Ma. A few mugearitic and benmoreitic late dykes were emplaced at 4.21 +/- 0.04 Ma. These chronological data are consistent with a Pacific plate motion of 11 cm/year with respect to a fixed Society plume. The Maupiti lava series results from the effects of fractional crystallisation of a parental alkali basalt magma displaying a prominent EM II isotopic and trace element signature, in many ways similar to that of the youngest Society hot spot lavas. This feature suggests that the geochemical signature of the Society plume did not change through time.
引用
收藏
页码:45 / 55
页数:11
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