?Missing links? for the long-lived Macdonald and Arago hotspots, South Pacific Ocean

被引:10
作者
Buff, L. [1 ]
Jackson, M. G. [1 ]
Konrad, K. [2 ,3 ]
Konter, J. G. [4 ]
Bizimis, M. [5 ]
Price, A. [1 ]
Rose-Koga, E. F. [6 ]
Blusztajn, J. [7 ]
Koppers, A. A. P. [3 ]
Herrera, Santiago [8 ]
机构
[1] Univ Calif Santa Barbara, Dept Earth Sci, Santa Barbara, CA 93106 USA
[2] Univ Nevada, Dept Geosci, Las Vegas, NV 89154 USA
[3] Univ Oregon, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA
[4] Univ Hawaii Manoa, Dept Earth Sci, Honolulu, HI 96822 USA
[5] Univ South Carolina, Sch Earth Ocean & Environm, Columbia, SC 29208 USA
[6] Univ Clermont Auvergne, Lab Magmas & Volcans, CNRS IRD OPGC, F-63170 Aubiere, France
[7] Woods Hole Oceanog Inst, Dept Marine Chem, Woods Hole, MA 02543 USA
[8] Lehigh Univ, Dept Biol Sci, Bethlehem, PA 18015 USA
基金
美国国家科学基金会;
关键词
AUSTRAL ISLANDS; MANTLE PLUMES; HOT-SPOTS; VOLCANISM; BASALTS; ISOTOPES; SEAMOUNT; HISTORY; MOTION; CHAIN;
D O I
10.1130/G48276.1
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
The Cook-Austral volcanic lineament extends from Macdonald Seamount (east) to Aitutaki Island (west) in the South Pacific Ocean and consists of hotspot-related volcanic islands, seamounts, and atolls. The Cook-Austral volcanic lineament has been characterized as multiple overlapping, age-progressive hotspot tracks generated by at least two mantle plumes, including the Arago and Macdonald plumes, which have fed volcano construction for ?20 m.y. The Arago and Macdonald hotspot tracks are argued to have been active for at least 70 m.y. and to extend northwest of the Cook-Austral volcanic lineament into the Cretaceous-aged Tuvalu-Gilbert and Tokelau Island chains, respectively. Large gaps in sampling exist along the predicted hotspot tracks, complicating efforts seeking to show that the Arago and Macdonald hotspots have been continuous, long-lived sources of hotspot volcanism back into the Cretaceous. We present new major- and trace-element concentrations and radiogenic isotopes for three seamounts (Moki, Malulu, Dino) and one atoll (Rose), and new clinopyroxene 40Ar/39Ar ages for Rose (24.81 ? 1.02 Ma) and Moki (44.53 ? 10.05 Ma). All volcanoes are located in the poorly sampled region between the younger Cook-Austral and the older, Cretaceous portions of the Arago and Macdonald hotspot tracks. Absolute plate motion modeling indicates that the Rose and Moki volcanoes lie on or near the reconstructed traces of the Arago and Macdonald hotspots, respectively, and the 40Ar/39Ar ages for Rose and Moki align with the predicted age progression for the Arago (Rose) and Macdonald (Moki) hotspots, thereby linking the younger Cook-Austral and older Cretaceous portions of the long-lived (>70 m.y.) Arago and Macdonald hotspot tracks.
引用
收藏
页码:541 / 544
页数:4
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