scholarly journals Peridotite nodules from the Nogpetseu and Lipelaneng kimberlites, lesotho: a crustal or mantle origin

2019 ◽  
Keyword(s):  
Mantle Origin

Upper mantle origin for Harding County well gases

Nature ◽  
1987 ◽  
Vol 325 (6105) ◽  
pp. 605-607 ◽  
Author(s):  
Thomas Staudacher
Keyword(s):  
Upper Mantle ◽  
Mantle Origin

Possible mantle origin of olivine around lunar impact basins detected by SELENE

2010 ◽  
Vol 3 (8) ◽  
pp. 533-536 ◽  
Author(s):  
Satoru Yamamoto ◽  
Ryosuke Nakamura ◽  
Tsuneo Matsunaga ◽  
Yoshiko Ogawa ◽  
Yoshiaki Ishihara ◽  
...  
Keyword(s):  
Mantle Origin ◽  
Lunar Impact ◽  
Impact Basins

Opx–Cpx exsolution textures in lherzolites of the Cretaceous Purang Ophiolite (S. Tibet, China), and the deep mantle origin of Neotethyan abyssal peridotites

2019 ◽  
Vol 62 (6) ◽  
pp. 665-682 ◽  
Author(s):  
Fahui Xiong ◽  
Yildirim Dilek ◽  
Richard Wirth ◽  
Xiangzhen Xu ◽  
Jingsui Yang
Keyword(s):  
Mantle Origin ◽  
Deep Mantle

Age and radiogenic isotopic systematics of the Borden carbonatite complex, Ontario, Canada

1987 ◽  
Vol 24 (1) ◽  
pp. 24-30 ◽  
Author(s):  
Keith Bell ◽  
John Blenkinsop ◽  
S. T. Kwon ◽  
G. R. Tilton ◽  
R. P. Sage
Keyword(s):  
Upper Mantle ◽  
Volcanic Rocks ◽  
Crustal Contamination ◽  
Growth Curves ◽  
Carbonatite Complex ◽  
Northern Ontario ◽  
Mantle Origin ◽  
Mid Ocean Ridge ◽  
Ocean Ridge ◽  
Isotope Correlation

Rb–Sr and U–Pb data from the Borden complex of northern Ontario, a carbonatite associated with the Kapuskasing Structural Zone, indicate a mid-Proterozoic age. A 207Pb/206Pb age of 1872 ± 13 Ma is interpreted as the emplacement age of this body, grouping it with other ca. 1900 Ma complexes that are the oldest known carbonatites associated with the Kapuskasing structure. A 206Pb–238U age of 1894 ± 29 Ma agrees with the Pb–Pb age but has a high mean square of weighted deviates (MSWD) of 42. A Rb–Sr apatite–carbonate–mica whole-rock isochron date of 1807 ± 13 Ma probably indicates later resetting of the Rb–Sr system.An εSr(T) value of −6.2 ± 0.5 (87Sr/86Sr = 0.70184 ± 0.00003) and an εNd(T) value of +2.8 ± 0.4 for Borden indicate derivation of the Sr and Nd from a source with a time-integrated depletion in the large-ion lithophile (LIL) elements. These closely resemble the ε values for Sr and Nd from the Cargill and Spanish River complexes, two other 1900 Ma plutons. The estimated initial 207Pb/204Pb and 206Pb/204Pb ratios from Borden calcites plot significantly below growth curves for average continental crust in isotope correlation diagrams, a pattern similar to those found in mid-ocean ridge basalts (MORB) and most ocean-island volcanic rocks, again suggesting a source depleted in LIL elements. The combined Nd and Sr, and probably Pb, data strongly favour a mantle origin for the Borden complex with little or no crustal contamination and support the model of Bell et al. that many carbonatites intruded into the Canadian Shield were derived from an ancient, LIL-depleted subcontinental upper mantle.

scholarly journals High-Mg adakites from Kadavu Island Group, Fiji, southwest Pacific: Evidence for the mantle origin of adakite parental melts

Geology ◽  
2008 ◽  
Vol 36 (6) ◽  
pp. 499 ◽  
Author(s):  
Leonid V. Danyushevsky ◽  
Trevor J. Falloon ◽  
Anthony J. Crawford ◽  
Sofia A. Tetroeva ◽  
Roman L. Leslie ◽  
...  
Keyword(s):  
Southwest Pacific ◽  
Mantle Origin ◽  
Island Group ◽  
Parental Melts
Sign in / Sign up

Export Citation Format

Share Document