Archaean zircons in Miocene oceanic hotspot rocks establish ancient continental crust beneath Mauritius

被引：60

作者：

Ashwal, Lewis D. ^{[1
]}

Wiedenbeck, Michael ^{[1
,2
]}

Torsvik, Trond H. ^{[1
,2
,3
,4
]}

机构：

[1] Univ Witwatersrand, Sch Geosci, Private Bag 3, ZA-2050 Johannesburg, South Africa

[2] Deutsch GeoForschungsZentrum GFZ, D-14473 Potsdam, Germany

[3] Univ Oslo, CEED, N-0316 Oslo, Norway

[4] NGU, Geodynam, N-7491 Trondheim, Norway

来源：

NATURE COMMUNICATIONS | 2017年 / 8卷

基金：

欧洲研究理事会;

关键词：

U-PB GEOCHRONOLOGY; TRACE-ELEMENT; DHARWAR CRATON; LU-HF; SEYCHELLES; OXYGEN; ARC; MICROCONTINENT; GEOCHEMISTRY; INDIA;

D O I：

10.1038/ncomms14086

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

A fragment of continental crust has been postulated to underlie the young plume-related lavas of the Indian Ocean island of Mauritius based on the recovery of Proterozoic zircons from basaltic beach sands. Here we document the first U-Pb zircon ages recovered directly from 5.7Ma Mauritian trachytic rocks. We identified concordant Archaean xenocrystic zircons ranging in age between 2.5 and 3.0 Ga within a trachyte plug that crosscuts Older Series plume-related basalts of Mauritius. Our results demonstrate the existence of ancient continental crust beneath Mauritius; based on the entire spectrum of U-Pb ages for old Mauritian zircons, we demonstrate that this ancient crust is of central-east Madagascar affinity, which is presently located similar to 700 km west of Mauritius. This makes possible a detailed reconstruction of Mauritius and other Mauritian continental fragments, which once formed part of the ancient nucleus of Madagascar and southern India.

引用

页数：9

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