Spreading center jumps and sub-axial asthenosphere flow near the Galapagos hotspot

Hey, R. N.; Vogt, Peter R.

doi:10.1016/0040-1951(77)90038-5

Cited by 97 publications

(61 citation statements)

References 16 publications

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“…This system (Figure 1), including the propagating rift and spreading center, the failing and failed spreading centers, outer and inner pseudofaults, transform zone, active transfer zone, and zone of previously transferred lithosphere (Figure 2), was first hypothesized from its magnetic anomaly pattern (Hey and Vogt, 1977) and has now been surveyed with GLORIA (Searle and Hey, 1983), SeaMARC II (e.g. Hey et aI., 1989), Sea Beam (e.g.…”

Section: Introductionmentioning

confidence: 98%

ALVIN investigation of an active propagating rift system, Galapagos 95.5� W

et al. 1992

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Abstract. ALVIN investigations have defined the fine-scale structural and volcanic patterns produced by active rift and spreading center propagation and failure near 95.5°W on the Galapagos spreading center. Behind the initial lithospheric rifting, which is propagating nearly due west at about 50 km m.y.-1, a triangular block of preexisting lithosphere is being stretched and fractured, with some recent volcanism along curving fissures. A well-organized seaf.oor spreading center, an extensively faulted and fissured volcanic ridge, develops ~10 km (~200,000 years) behind the tectonic rift tip. Regional variations in the chemical compositions of the youngest lavas collected during this program contrast with those encompassing the entire 3 m.y. of propagation history for this region. A maximum in degree of magmatic differentiation occurs about 9 km behind the propagating rift tip, in a region of diffuse rifting. The propagating spreading center shows a gentle gradient in magmatic differentiation culminating at the SW-curving spreading center tip. Except for the doomed rift, which is in a constructional phase, tectonic activity also dominates over volcanic activity along the failing spreading system. In contrast to the propagating rift, failing rift lavas show a highly restricted range of compositions consistent with derivation from a declining upwelling zone accompanying rift failure. The lithosphere transferred from the Cocos to the Nazca plate by this propagator is extensively faulted and characterized by ubiquitous talus in one of the most tectonically disrupted areas of seafloor known. The pseudofault scarps, where the preexisting lithosphere was rifted apart, appear to include both normal and propagator lavas and are thus more lithologically complex than previously thought. Biological communities, probably vestimentiferan tubeworms, occur near the top of the outer pseudofault scarp, although no hydrothermal venting was observed.

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Section: Introductionmentioning

confidence: 98%

ALVIN investigation of an active propagating rift system, Galapagos 95.5� W

et al. 1992

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“…The Galápagos Archipelago and hotspot tracks on the northeast-moving Cocos Plate, consisting of the Cocos aseismic ridge and related seamount province to the north, and on the eastward-moving Nazca Plate, including Carnegie, Malpelo and Coiba aseismic ridges are the surface expressions of the long-lived Galápagos mantle plume and its interaction with the GSC over the last 23 Ma ( Fig. 1; e.g., Handschumacher, 1976;Hey and Vogt, 1977;Wilson and Hey, 1995;Canales et al, 1997;Werner et al, 1999Werner et al, , 2003. Over the last 5 Ma, the GSC, located north of the Galápagos hotspot, has been progressively drifting northwards but has been repeatedly captured by the hotspot, as reflected by numerous ridge-jumps (Wilson and Hey, 1995;Mittelstaedt et al, 2012;Gibson et al, 2015).…”

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confidence: 99%

A 1.5 Ma record of plume-ridge interaction at the Western Galápagos Spreading Center (91°40′–92°00′W)

Herbrich

Hauff

Hoernle

et al. 2016

Geochimica et Cosmochimica Acta

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“…As with the Pacific-Antarctic ridge, the axial high becomes less pronounced towards the AAD. Propagating rifts that approach the AAD from the east (and west) may be driven by this along-axis asthenospheric flow [Hey and Vogt, 1977]; indeed lavas collected from these propagating rifts are geochemically identical to those collected from propagating rifts associated with hotspots [Christie et al, 1988].…”

Section: Discussionmentioning

confidence: 99%