On the possibility of a second kind of mantle plume

Cserepes, L.; Yuen, David A.

doi:10.1016/s0012-821x(00)00265-x

Cited by 67 publications

(29 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many think of "hotspots"-locations of intraplate volcanism-as thermal plumes, but most hotspots are thought to be no hotter than average (Stein and Stein, 2003;DeLaughter et al, this volume;Green and Falloon, this volume). Several classic "plumes" show no evidence for an initial head phase (e.g., Hawaii) or a tail phase (e.g., Siberia, Ontong-Java), and several plume proponents now suggest that the classic model is too restrictive and that not all plumes need have heads or tails, and not all plumes need be deep-sourced (e.g., Cserepes and Yuen, 2000). Tailless upper-mantle "plumes" of the type conceived by Cserepes and Yuen (2000) still cannot explain observations such as the absent or insignificant prevolcanic lithospheric uplift in Siberia or Ontong-Java.…”

Section: Introductionmentioning

confidence: 99%

“…Several classic "plumes" show no evidence for an initial head phase (e.g., Hawaii) or a tail phase (e.g., Siberia, Ontong-Java), and several plume proponents now suggest that the classic model is too restrictive and that not all plumes need have heads or tails, and not all plumes need be deep-sourced (e.g., Cserepes and Yuen, 2000). Tailless upper-mantle "plumes" of the type conceived by Cserepes and Yuen (2000) still cannot explain observations such as the absent or insignificant prevolcanic lithospheric uplift in Siberia or Ontong-Java. Campbell and Griffiths (1990), originators of the modern model of plume heads and tails based on fluid dynamic modeling, postulated that the inflated heads of new plumes contain plume source material into which surrounding cooler midocean ridge basalt (MORB) mantle becomes entrained during upwelling and that plume tails contain hot plume source material.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

From Deccan to Réunion: No trace of a mantle plume

Sheth¹

2005

Plates, Plumes and Paradigms

View full text Add to dashboard Cite

The widely accepted mantle plume model postulates that (1) the currently volcanically active Réunion Island in the Indian Ocean is fed by the narrow "tail" of a mantle plume that rises from the core-mantle boundary, (2) the Deccan continental flood basalt province of India originated from the "head" of the same plume during its early eruptive phase near the end of the Cretaceous, and (3) the LakshadweepChagos Ridge, an important linear volcanic ridge in the Indian Ocean, is a product of the plume. It is not generally appreciated, however, that this "classic" case of a plume contradicts the plume model in many ways. For example, there is little petrological evidence as yet that the Deccan source was "abnormally hot," and the short (~1.0-0.5 m.y.) duration claimed by some for the eruption of the Deccan is in conflict with recent Ar-Ar age data that suggest that the total duration was at least ~8 m.y. The Deccan continental flood basalts (CFB) were associated with the break-off of the Seychelles microcontinent from India. Geological and geophysical data from the Deccan provide no support for the plume model and arguably undermine it altogether. The interplay of several intersecting continental rift zones in India is apparently responsible for the roughly circular outcrop of the Deccan. The Lakshadweep-Chagos Ridge and the islands of Mauritius and Réunion are located along fracture zones, and the apparent systematic age progression along the ridge may be a result of southward crack propagation through the oceanic lithosphere. This idea avoids the problem of a 10 o paleolatitude discrepancy which the plume model can solve only with the ad hoc inclusion of mantle roll. Published Ar-Ar age data for the Lakshadweep-Chagos Ridge basalts have been seriously questioned, and geochemical data suggest that they likely represent postshield volcanism and so are unsuitable for hotspot-based plate reconstructions. "Enriched" isotopic ratios, such as values of 87 Sr/ 86 Sr higher than those for normal mid-ocean ridge basalts, which have been observed in basalts of the ridge and the Mascarene Islands, may mark the involvement of delaminated enriched continental mantle instead of a plume. High values of 3 He/ 4 He also do not represent a deep mantle component or plume. The three Mascarene islands (Mauritius, Réunion, and Rodrigues) are not related to the Deccan but reflect the recent (post-10 Ma) tectonicmagmatic development of the Africa Plate. I relate CFB volcanism to continental rifting, which often (but not always) evolves into full-fledged seafloor spreading. I ascribe the rifting itself not to mantle plume heads but to large-scale plate dynamics themselves, possibly aided by long-term thermal insulation beneath a supercontinent that may have surface effects similar to those predicted for "plume incubation" models. 477on May 26, 2015 specialpapers.gsapubs.org Downloaded from Nonplume plate tectonic models are capable of explaining the Deccan in all its greatness, and there is no trace of a mantle plume in this vast region.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

From Deccan to Réunion: No trace of a mantle plume

Sheth¹

2005

Plates, Plumes and Paradigms

View full text Add to dashboard Cite

show abstract

“…The low-V layer may reflect ponding of plume material in the top part of the lower mantle (Fig. 5.3), probably due to the existence of a low-viscosity layer, the so-called "second asthenosphere" lying between 660 and 1000 km depth, as suggested by computer simulation studies (e.g., Kido and Cadek 1997;Cserepes and Yuen 2000;Tosi and Yuen 2011). The second asthenosphere is able to produce mid-mantle plumes which develop from a boundary layer in the middle mantle, in contrast to the upper-mantle plume and lower-mantle plume which develop at the thermal boundary layer at 660 km and 2900 km depth, respectively (Cserepes and Yuen 2000).…”

Section: Plume Behaviors In and Below Mantle Transition Zonementioning

confidence: 96%

“…It is generally considered that the 660 km discontinuity is caused by the endothermic spinel-perovskite phase transition (e.g., Ito and Takahashi 1989;Bina and Helffrich 1994) which can act as a strong, but incomplete barrier to vertical flows, i.e., the subducting slabs and ascending mantle plumes. If this barrier leaks at some relatively small spots, upward directed eruptions of the lower mantle material would take the form of the usual mushroom-shaped plumes in the upper mantle (Cserepes and Yuen 2000). The tomographic images under Hawaii, Reunion and Louisville may reflect such a scenario (Zhao 2007).…”

Section: Plume Behaviors In and Below Mantle Transition Zonementioning

confidence: 99%

Hotspots and Mantle Plumes

Zhao

2015

Multiscale Seismic Tomography

View full text Add to dashboard Cite

Seismic images under 62 possible hotspots are reviewed for understanding the origin of hotspots and mantle plumes. Plume-like, continuous low-velocity anomalies are visible beneath Hawaii, Tahiti, Louisville, Iceland, Cape Verde, Reunion, Kerguelen, Amsterdam, Afar, Eifel, Hainan, Yellowstone and Cobb hotspots, suggesting that they may be 13 whole-mantle plumes originating from the core-mantle boundary. These plumes exhibit tilted images, suggesting that plumes are not fixed in the mantle but can be deflected by the mantle flow. Upper-mantle plumes seem to exist beneath Cameroon, Easter, Azores, Vema, East Australia and Erebus hotspots. A mid-mantle plume may exist under the San Felix hotspot. Active intraplate volcanoes in Northeast Asia and Southwest China are caused by hot and wet upwelling flows in the big mantle wedge above the stagnant slab in the mantle transition zone. Although low-velocity zones appear at some depth under other hotspots, their plume features are not clear. The complex images under hotspots reflect strong lateral variations in temperature, viscosity and possibly composition of the mantle, which control the generation and ascent of mantle plumes and the flow pattern of mantle convection.

show abstract

“…Multidimensional Filtering with Wavelets sometimes 100 Gbytes for a long 3-D simulation (CSEREPES and YUEN, 2000), which must be interpreted visually and analyzed efficiently. There are other applications in geophysics in which wavelet filtering can play an important role in the analysis.…”

Section: Vol 159 2002mentioning

confidence: 99%

Geophysical Applications of Multidimensional Filtering with Wavelets

Yuen¹,

Vincent²,

Kido³

et al. 2002

Pure and Applied Geophysics

View full text Add to dashboard Cite

We present imaging results in geophysics based on using multidimensional Gaussian wavelets as a filter in a 2-D Cartesian domain. Besides decomposing the field into various distinct lengthscales, we have also constructed the 2-D maps describing the spatial distributions of the maximum of the wavelet-transformed L 2 -norm E max (x,y) and its corresponding local wavenumber k max (x,y), where x and y are the Cartesian coordinates. For geoid anomalies, using a wavelet filter extending to 90 degrees, we have discerned the distinct outlines of convergent and divergent tectonic zones and have conducted a quantitative comparison of the short-wavelength gravitational anomalies at those wavelengths between two different geographical locations. We have also compared the wavelet results with a nonlinear bandpass filter in the spectral domain where a Gaussian filter with the logarithm of the degree l acting as the argument has been employed. A wavelet solution, with a length-scale corresponding to 256 degrees, would need a filter with over 400 spherical harmonics centering around l ¼ 157 for an optimal spatial fit. The computational effort with the bandpass filter technique greatly exceeds those associated with wavelets. We have also shown the ability of the wavelets to analyze the vastly different scales present in high Rayleigh number convection and the mixing of passive heterogeneities driven by thermal convection. Wavelets will be a useful tool for rapid analyzing of the large multidimensional fields to be captured in many other geophysical endeavors, such as the upcoming gravity satellite missions and satellite radar interferometry images.

show abstract

On the possibility of a second kind of mantle plume

Cited by 67 publications

References 42 publications

From Deccan to Réunion: No trace of a mantle plume

From Deccan to Réunion: No trace of a mantle plume

Hotspots and Mantle Plumes

Geophysical Applications of Multidimensional Filtering with Wavelets

Contact Info

Product

Resources

About