|
|
 |
|||||||||||||||||
|
|||||||||||||||||
 |
|||||||||||||||||
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
1 Centre for Ore Deposit Research and School of Earth Sciences, University of Tasmania, GPO Box 252-79, Hobart, Tasmania 7001, Australia
2 Department of Earth Sciences, La Trobe University, Bundoora, Victoria 3083, Australia
3 Vernadsky Institute of Geochemistry, Russian Academy of Sciences, Kosigin 19, Moscow 117975, Russia
4 Centre for Ore Deposit Research, University of Tasmania, GPO Box 252-79, Hobart, Tasmania 7001, Australia
5 Department of Earth Sciences, Monash University, Clayton, Victoria 3168, Australia
6 Geological Institute, Russian Academy of Sciences, Pyzhevsky 7, Moscow 109017, Russia
Dredged glass from the southern Mid-Atlantic Ridge near the Bouvet Triple Junction has unique major element, trace element, and isotopic composition, distinct from typical mid-ocean ridge basalts. It is a high-Mg (Mg# 67.8), high-Ni (NiO 290 ppm) andesite depleted in highly incompatible and heavy rare-earth elements with an isotopic signature of ancient continental lithosphere (i.e., low 206Pb/204Pb and 143Nd/144Nd and high 87Sr/86Sr and 
18O). The origin of this glass is attributed to melting of a Precambrian garnet-bearing, mafic lithology, possibly related to lower crustal blocks stranded in the upper mantle during breakup of Gondwana and opening of the Atlantic. This composition can be used to explain anomalous geochemical features of oceanic rocks in the Southern Hemisphere
Key Words: mid-ocean ridge basalts • isotopes • mantle heterogeneities • subcontinental lithosphere • South Atlantic • Gondwana
This article has been cited by other articles:
|
|
 |
|
  A. V. Sobolev, A. W. Hofmann, D. V. Kuzmin, G. M. Yaxley, N. T. Arndt, S.-L. Chung, L. V. Danyushevsky, T. Elliott, F. A. Frey, M. O. Garcia, et al. The Amount of Recycled Crust in Sources of Mantle-Derived Melts Science, April 20, 2007; 316(5823): 412 - 417. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 M. Lustrino, L. Melluso, and V. Morra The geochemical peculiarity of "Plio-Quaternary" volcanic rocks of Sardinia in the circum-Mediterranean area Geological Society of America Special Papers, January 1, 2007; 418(0): 277 - 301. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 C. Class and A. P. le Roex Continental material in the shallow oceanic mantle--How does it get there? Geology, March 1, 2006; 34(3): 129 - 132. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 P. E. JANNEY, A. P. LE ROEX, and R. W. CARLSON Hafnium Isotope and Trace Element Constraints on the Nature of Mantle Heterogeneity beneath the Central Southwest Indian Ridge (13{degrees}E to 47{degrees}E) J. Petrology, December 1, 2005; 46(12): 2427 - 2464. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S.-Q. ZHANG, J. J. MAHONEY, X.-X. MO, A. M. GHAZI, L. MILANI, A. J. CRAWFORD, T.-Y. GUO, and Z.-D. ZHAO Evidence for a Widespread Tethyan Upper Mantle with Indian-Ocean-Type Isotopic Characteristics J. Petrology, April 1, 2005; 46(4): 829 - 858. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. EWART, J. S. MARSH, S. C. MILNER, A. R. DUNCAN, B. S. KAMBER, and R. A. ARMSTRONG Petrology and Geochemistry of Early Cretaceous Bimodal Continental Flood Volcanism of the NW Etendeka, Namibia. Part 1: Introduction, Mafic Lavas and Re-evaluation of Mantle Source Components J. Petrology, January 1, 2004; 45(1): 59 - 105. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
V. S. KAMENETSKY and R. MAAS Mantle-melt Evolution (Dynamic Source) in the Origin of a Single MORB Suite: a Perspective from Magnesian Glasses of Macquarie Island J. Petrology, October 1, 2002; 43(10): 1909 - 1922. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 E. M. Moores Pre-1 Ga (pre-Rodinian) ophiolites: Their tectonic and environmental implications Geological Society of America Bulletin, January 1, 2002; 114(1): 80 - 95. [Abstract] [Full Text] [PDF]
|
|
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
