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Dupal anomalies

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Journal Article
Journal: Geology
Published: 01 February 1991
Geology (1991) 19 (2): 99–102.
... of the Kerguelen-Heard plume (ca. 115 Ma), now located under Heard Island, south of the Southeast Indian Ridge, provides evidence that the source of the Dupal anomaly is deep seated. Geological Society of America 1991 ...
Series: Geological Society, London, Special Publications, Geological Society, London, Special Publications
Published: 01 January 2002
DOI: 10.1144/GSL.SP.2002.199.01.06
EISBN: 9781862394476
...-day DUPAL anomalies south of India (Ninetyeast Ridge), and this may represent one of the best examples of survival of μ 1 heterogeneities in the lithosphere, migrating with plate tectonic motion. A first version of this manuscript has benefited from the comments of F. Albarède. B.L. is grateful...
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Journal Article
Journal: Geology
Published: 01 March 2013
Geology (2013) 41 (3): 335–338.
...-like composition), may reflect the African superplume composition, whereas the more depleted northern Tristan subtrack source could represent a mixture of the superplume with the surrounding depleted mantle. Our results strengthen arguments that the enriched signature (DUPAL anomaly) in the South...
FIGURES | View All (4)
Journal Article
Journal: Geology
Published: 01 March 1996
Geology (1996) 24 (3): 271–274.
...P. R. Castillo Abstract Newly acquired Sr, Nd, and Pb isotope data, combined with other recently available data in the literature, clearly show that Philippine arc volcanic rocks do not have a true Dupal isotopic anomaly. Instead, most of the volcanic rocks must have come from a mantle source...
Journal Article
Journal: Geology
Published: 01 March 1997
Geology (1997) 25 (3): 284–285.
Journal Article
Journal: Geology
Published: 01 January 2013
Geology (2013) 41 (1): 19–22.
... isotopic separation between northern and southern trend volcanoes. If the seismic low velocity zone corresponds with the DUPAL anomaly, there is the potential to map out the location of this geochemically and seismically anomalous deep-mantle feature using multiple, geographically dispersed dual-chain...
FIGURES
Journal Article
Published: 01 May 2003
Journal of the Geological Society (2003) 160 (3): 377–384.
... a small, but significant, contribution from Indian Ocean sediments subducted, dewatered and metamorphosed beneath the arc. The southward subduction model of Khan et al . (1997) is heavily dependent on two factors: the fact of the ‘Dupalanomaly, and the presence of boninites in the Hunza Formation...
FIGURES | View All (6)
Series: GSA Special Papers
Published: 01 January 2006
DOI: 10.1130/2006.2409(24)
... earth elements (HREE)—with (La/Yb) N ratios ranging from 4.3 to 699, mainly 40–50; ∑REE and abundances of 50–2560 ppm, mainly 300–500 ppm—in most cases lacking significant negative Eu anomalies. However, the element distributions for kamafugite and carbonatite show ocean island basalt–like nondepleted...
Journal Article
Published: 01 September 1998
Journal of the Geological Society (1998) 155 (5): 893–895.
... suggested formation above the DUPAL isotopic anomaly, presently some 2000 km south of the present position of Kohistan. However,Khan et al. 1997 interpreted trace element geochemical data to imply a southerly dipping subduction zone beneath Kohistan during its formation as an intra-oceanic island arc. Below...
Journal Article
Published: 01 December 1997
Journal of the Geological Society (1997) 154 (6): 935–946.
... of the DUPAL isotopic anomaly, at near equatorial latitudes. Geological setting The Kohistan terrane is located in northern Pakistan and is bounded to the north by the Shyok (or Northern) Suture and to the south by the Indus Suture (Fig. 1). Sedimentary sequences indicate that formation of the intra-oceanic...
Journal Article
Journal: GSA Bulletin
Published: 01 March 2009
GSA Bulletin (2009) 121 (3-4): 366–384.
... arc by 61 Ma. We interpret that cessation to date the collision of Kohistan with India. This new timing is confirmed by evidence that a Southern Hemisphere enriched DUPAL mantle source was involved in the generation of the latest Cretaceous Teru Volcanic Formation rocks of the Kohistan-Ladakh arc...
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Journal Article
Published: 01 December 1988
Journal of the Geological Society (1988) 145 (6): 985–998.
... are consistent with the derivation of the basalts from a depleted source region broadly similar to that of MORB and non-Dupal OIB. Correlated LILE/HFSE-isotope trends demonstrate that the olivine basalts are enriched in the LILE and 87 Sr but depleted in 143 Nd relative to other Alexander Island samples...
Image
Contours of lower mantle p-wave velocity <b>anomalies</b>, hot spots (triangles), ...
Published: 01 October 2015
Figure 6.1 Contours of lower mantle p-wave velocity anomalies, hot spots (triangles), and maxima of Pb and Sr isotopic anomalies (red) in OIB in the Indian-South Atlantic (DUPAL) and South Pacific (SOPITA) regions (after Castillo, 1988 ).
Journal Article
Published: 01 September 2019
Russ. Geol. Geophys. (2019) 60 (9): 957–977.
... consequence of these successive accretions was a strong metasomatism and a softening of the upper part of the Tibetan cover. The P wave low-velocity anomaly currently observed under the central part of Tibet would correspond not to a temperature anomaly but to a composition anomaly. From 50 Ma onwards...
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Journal Article
Journal: Elements
Published: 01 December 2005
Elements (2005) 1 (5): 271–275.
...) Plates, Plumes, and Paradigms, Geological Society of America Special Paper 388 , pp 449 – 462 Escrig S , Capmas F , Dupré B , Allègre CJ ( 2004 ) Osmium isotopic constraints on the nature of the DUPAL anomaly from Indian mid-ocean-ridge basalts . Nature 431 : 59 – 63...
FIGURES | View All (4)
Journal Article
Journal: Geophysics
Published: 25 February 2020
Geophysics (2020) 85 (2): D65–D74.
...Andrew J. Carter; Veronica A. Torres Caceres; Kenneth Duffaut; Alexey Stovas ABSTRACT Seismic attenuation distorts phase and narrows bandwidth in seismic surveys. It is also an exploration attribute, as, for example, gas or overpressure, may create attenuation anomalies. Compensating attenuation...
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Journal Article
Published: 01 February 2008
The Canadian Mineralogist (2008) 46 (1): 19–40.
... contents, likely due to the different position of this phase in the crystallization sequence; Sc reaches values as high as 200 ppm, whereas the lanthanides show very variable enrichment in light over heavy REE, and commonly show a negative Eu anomaly. The olivine, phlogopite (and tetra-ferriphlogopite), Cr...
FIGURES | View All (11)
Image
Comparison of δ 18 O values for NMORB and back-arc-basin glasses with  87 S...
Published: 01 January 2001
Figure 24. Comparison of δ 18 O values for NMORB and back-arc-basin glasses with 87 Sr/ 86 Sr ratios measured on the same samples; data from Eiler et al. (2000a , b) . Indian MORB have been excluded in order to avoid confounding effects of the Dupal anomaly, which is marked by large
Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 29 April 2021
Lithosphere (2021) 2021 (Special 2): 6619463.
... and the surrounding region (Figure 6 ) related to the existence of mantle plume. Our studied U1434 volcanic glasses and previous studied bulk-rocks are within the field of Indian-type MORB with the significant Dupal anomaly (Figure 6 ). The studied U1434 volcanic glasses have relatively higher 208 Pb/ 206 Pb...
FIGURES | View All (12)
Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2007.2430(10)
... with the Sr-Pb Dupal anomaly ( Dupre and Allègre, 1983 ; Hart, 1984 ). The Dupal anomaly shows an isotopic similarity between the Tristan group, Kerguelen, and Ninetyeast Ridge. Grouping Ninetyeast with Kerguelen-plume volcanism is acceptable, because the old and dead Ninetyeast Ridge was formed prior to ca...