(Table 1) 40Ar/39Ar plateau and isochron ages for basalts from the Réunion hotspot track

DOI

Concordant plateau and isochron ages were calculated from 40Ar/39Ar incremental heating experiments on volcanic rocks recovered by drilling at four Leg 115 sites and two industry wells along the volcanic lineament connecting Reunion Island to the Deccan flood basalts, western Indian Ocean. The new ages provide unequivocal evidence that volcanic activity migrated southward along this sequence of linear ridges. The geometry and age distribution of volcanism are most compatible with origin above a stationary hotspot centered beneath Reunion. The hotspot became active with rapid eruption of the Deccan flood basalts, western India, and subsequent volcanic products record the northward motion of the Indian and African plates over the hotspot through Tertiary time. The radiometric ages are in general accord with basal biostratigraphic age estimates, although some adjustments in current magnetobiostratigraphic time scales may be required.

Supplement to: Duncan, Robert A; Hargraves, Robert B (1990): 40Ar/39Ar geochronology of basement rocks from the Mascarene Plateau, the Chagos Bank, and the Maldives Ridge. In: Duncan, RA; Backmann, J; Peterson, LC; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 115, 43-51

Identifier
DOI https://doi.org/10.1594/PANGAEA.756141
Related Identifier https://doi.org/10.2973/odp.proc.sr.115.141.1990
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.756141
Provenance
Creator Duncan, Robert A; Hargraves, Robert B
Publisher PANGAEA
Publication Year 1990
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 225 data points
Discipline Earth System Research
Spatial Coverage (59.017W, -13.114S, 73.831E, 5.082N); South Indian Ridge, South Indian Ocean; Indian Ocean; Lakshadweep Sea
Temporal Coverage Begin 1987-05-24T03:30:00Z
Temporal Coverage End 1987-06-28T07:45:00Z