Osmium isotope systematics and highly siderophile element fractionation in spinel-peridotites from the Tethyan ophiolites in SW Turkey: Implications for multi-stage evolution of oceanic upper mantle

2012 ◽  
Vol 294-295 ◽  
pp. 152-164 ◽  
Author(s):  
E. Aldanmaz ◽  
T. Meisel ◽  
O.F. Celik ◽  
F. Henjes-Kunst
Keyword(s):  
Upper Mantle ◽  
Multi Stage ◽  
Sw Turkey ◽  
Element Fractionation ◽  
Isotope Systematics ◽  
Osmium Isotope

Kalkkop Crater, Cape Province, South Africa: Confirmation of impact origin using osmium isotope systematics

1994 ◽  
Vol 58 (3) ◽  
pp. 1229-1234 ◽  
Author(s):  
Christian Koeberl ◽  
Wolf Uwe Reimold ◽  
Steven B Shirey ◽  
F.G le Roux
Keyword(s):  
South Africa ◽  
Isotope Systematics ◽  
Impact Origin ◽  
Osmium Isotope

scholarly journals Noble gases confirm plume-related mantle degassing beneath Southern Africa

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
S. M. V. Gilfillan ◽  
D. Györe ◽  
S. Flude ◽  
G. Johnson ◽  
C. E. Bond ◽  
...  
Keyword(s):  
Heat Flow ◽  
Mantle Plume ◽  
Southern Africa ◽  
Upper Mantle ◽  
Thermal Anomaly ◽  
Continental Lithosphere ◽  
Thermal Perturbation ◽  
Deep Mantle ◽  
Kwazulu Natal ◽  
Isotope Systematics

Abstract Southern Africa is characterised by unusually elevated topography and abnormal heat flow. This can be explained by thermal perturbation of the mantle, but the origin of this is unclear. Geophysics has not detected a thermal anomaly in the upper mantle and there is no geochemical evidence of an asthenosphere mantle contribution to the Cenozoic volcanic record of the region. Here we show that natural CO2 seeps along the Ntlakwe-Bongwan fault within KwaZulu-Natal, South Africa, have C-He isotope systematics that support an origin from degassing mantle melts. Neon isotopes indicate that the melts originate from a deep mantle source that is similar to the mantle plume beneath Réunion, rather than the convecting upper mantle or sub-continental lithosphere. This confirms the existence of the Quathlamba mantle plume and importantly provides the first evidence in support of upwelling deep mantle beneath Southern Africa, helping to explain the regions elevation and abnormal heat flow.

Rhenium-Osmium Isotope Systematics of Carbonaceous Chondrites

Science ◽  
1989 ◽  
Vol 243 (4890) ◽  
pp. 519-522 ◽  
Author(s):  
R. J. WALKER ◽  
J. W. MORGAN
Keyword(s):  
Carbonaceous Chondrites ◽  
Isotope Systematics ◽  
Osmium Isotope
Sign in / Sign up

Export Citation Format

Share Document