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- Publications
- Influence
Magmatic stratigraphy in the Bushveld Northern Lobe: continuous geophysical and mineralogical data from the 2950 m Bellevue drillcore
- L. Ashwal, S. J. Webb, Mike Knoper
- Geology
- 1 September 2005
We present a large database of geophysical, petrological and mineralogical measurements for the ~3000 m Bellevue borehole through the entire Upper Zone (UZ) and about half of the Main Zone (MZ) of… Expand
U‐Pb Geochronology and Isotope Geochemistry of the Archean and Proterozoic Rocks of North‐Central Madagascar
- R. D. Tucker, L. Ashwal, M. Handke, M. Hamilton, M. Le Grange, R. Rambeloson
- Geology
- The Journal of Geology
- 1 March 1999
New U‐Pb zircon ages and Sm‐Nd and Rb‐Sr isotopic data are presented for orthogneisses from north‐central Madagascar, including Île Sainte Marie, Alaotra‐Beforona, Maevatanana, and… Expand
Petrogenesis of Neoproterozoic Granitoids and Related Rocks from the Seychelles: the Case for an Andean-type Arc Origin
- L. Ashwal, D. Demaiffe, T. Torsvik
- Geology
- 2002
compositions ( Nd 750 = +5·46 to −0·87; ISr 750 = 0·7021– The Seychelles islands consist of undeformed and unmetamorphosed, 0·7061) that can be modelled as basaltic magmas derived from metaluminous… Expand
Sedimentology, geochronology and provenance of the Proterozoic Itremo Group, central Madagascar, and implications for pre-Gondwana palaeogeography
- R. Cox, R. Armstrong, L. Ashwal
- Geology
- Journal of the Geological Society
- 1 November 1998
Proterozoic metasediments of the Itremo Group in central Madagascar probably represent a passive margin sequence predating Gondwana assembly. The quartzites are well-sorted quartz arenites that… Expand
Peri-Gondwanan elements in the Caledonian Nappes of Finnmark, Northern Norway: Implications for the paleogeographic framework of the Scandinavian Caledonides
- F. Corfu, R. J. Roberts, T. Torsvik, L. Ashwal, D. M. Ramsay
- Geology
- American Journal of Science
- 1 February 2007
The Kalak Nappe Complex in the northern Scandinavian Caledonides has historically been interpreted as representing the pre-Caledonian margin of Baltica consisting of a Precambrian basement and a late… Expand
THE TEMPORALITY OF ANORTHOSITES
- L. Ashwal
- Geology
- 1 August 2010
The compositions, textures, associated rocks and tectonic environments of anorthosites allow categorization into six different types, some of which show distinct age-restrictions in terrestrial and… Expand
Late Cretaceous India–Madagascar fit and timing of break‐up related magmatism
- T. Torsvik, R. Tucker, +4 authors P. Venkataramana
- Geology
- 29 October 2000
A U–Pb zircon age of 91.2 ± 0.2 Myr from western India (St. Mary islands) confidently links India with the Late Cretaceous magmatic province in Madagascar (≈ 84–92 Ma), and the U–Pb age is within… Expand
Late Cretaceous magmatism in Madagascar: palaeomagnetic evidence for a stationary Marion hotspot
- T. Torsvik, R. D. Tucker, L. Ashwal, E. Eide, N. Rakotosolofo, M. Wit
- Geology
- 15 December 1998
Late Cretaceous basaltic volcanics in the Morondava Basin (SW Madagascar) possess high-quality and pre-fold palaeomagnetic data (declination 353.5°, inclination −54.8°, α95 = 2.4°). The… Expand
Oxygen and Hydrogen Isotope Stratigraphy of the Rustenburg Layered Suite, Bushveld Complex: Constraints on Crustal Contamination
- C. Harris, J. Pronost, L. Ashwal, R. G. Cawthorn.
- Geology
- 24 November 2004
New dO values for plagioclase, pyroxene and olivine, and limited whole-rock dD values are presented for samples from the Rustenburg Layered Suite of the Bushveld Complex, South Africa. In combination… Expand