Volcanic Rifted Margins

Menzies, Martin; Klemperer, S. L.; Ebinger, C. J.; Baker, Joel A.

doi:10.1130/spe362

Cited by 55 publications

(21 citation statements)

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“…These reflections are interpreted to be seaward-dipping reflectors consisting of volcanic wedges deposited during the late stages of continental rifting to early stages of seafloor spreading, similar to those described for other volcanic-rifted margins (e.g. Hinz, 1981;Roberts et al, 1984;Mutter et al, 1982;Menzies et al, 2002;Franke et al, 2007). The arcuate geometry of these reflections may be related to the presence of interlayered basalt flows and sediments as described for other volcanic-rifted margins (Roberts et al, 1984;Franke et al, 2007).…”

Section: Syn-rift Megasequence (Late Jurassic-late Hauterivian)mentioning

confidence: 89%

“…As many other volcanic-rifted margins the continental passive margin of Namibia is tilted towards the sea (Corner et al, 2002;Menzies et al, 2002). Gravitational failure in the Orange Basin may have been caused by the basinward tilt induced by passive margin uplift.…”

Section: Controls On Gravity Sliding In the Orange Basinmentioning

confidence: 96%

“…1 and 2). Rifting and opening of the Orange Basin is believed to have occurred in an already extended and possibly inverted basement (Clemson et al, 1999) and occurred coevally with extrusion of flood basalts of the Etendenka-Parana Igneous province approximately 132 Ma (Menzies et al, 2002). Following rifting, post-rift subsidence led to basin flooding and deposition of deep marine sediments and subsequent delta progradation (Light et al, 1993).…”

Section: Plate Tectonic Setting and Location Of The Study Areamentioning

confidence: 98%

See 2 more Smart Citations

Structural evolution of the Orange Basin gravity-driven system, offshore Namibia

Vera¹,

Granado²,

McClay³

2010

Marine and Petroleum Geology

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Section: Syn-rift Megasequence (Late Jurassic-late Hauterivian)mentioning

confidence: 89%

Section: Controls On Gravity Sliding In the Orange Basinmentioning

confidence: 96%

Section: Plate Tectonic Setting and Location Of The Study Areamentioning

confidence: 98%

See 1 more Smart Citation

Structural evolution of the Orange Basin gravity-driven system, offshore Namibia

Vera¹,

Granado²,

McClay³

2010

Marine and Petroleum Geology

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“…Volcanic rifted margins are characterized by thick wedges of volcanic flows [ Eldholm et al , 1995; Hinz , 1981; Mutter et al , 1982; White et al , 1987] and form the majority of passive margins worldwide [ Menzies et al , 2002; Skogseid , 2001]. It is generally agreed that the southern South Atlantic margins (Figure 1; between the Walvis/Rio Grande Ridges and the Falkland–Agulhas Fracture Zone) are of the volcanic rifted margin type [ Bauer et al , 2000; de Vera et al , 2010; Franke et al , 2007; Gladczenko et al , 1997; Hinz et al , 1999; Hirsch et al , 2009; Schnabel et al , 2008].…”

Section: Introductionmentioning

confidence: 99%

Birth of a volcanic margin off Argentina, South Atlantic

Franke

Ladage

Schnabel

et al. 2010

Geochem Geophys Geosyst

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[1] Based on a dense grid of multichannel reflection seismic lines we study the evolution of a volcanic rifted margin segment off Argentina. The segment under study is located between 44°S and 41°S. We describe in detail the facies of the extrusive basaltic complexes across the margin. These include single and multiple Inner Seaward Dipping Reflectors (SDRs) with varying architecture along the margin, Outer Highs, and Outer SDR wedges. A detailed interpretation of a transitional zone between the Inner and Outer SDR wedges is presented. Multiple Inner SDRs are concentrated at the southern part of the margin segment, while in the north only one steeply dipping wedge is present. The dip of the Inner SDR wedges changes along the margin, and we propose subsidence by loading as main cause. The transitional zone between the Inner and Outer SDR wedges becomes narrower toward the north. By correlating with magnetic data we conclude that the emplacement of the 30-100 km wide multiple Inner SDRs occurred episodically. We propose an injection center which migrated in a seaward direction with proceeding extension as the origin for the multiple Inner SDRs. A scissor-like opening of the margin segment resulted in different amounts of stretching along-strike of the margin segment and is likely the cause for the varying distribution of the extrusive basaltic complexes. The varying extension rates within the margin segment contribute to decreasing volumes of melts generated in a northward direction within this rift segment.Components: 9834 words, 12 figures, 1 table.

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“…Rifted volcanic margins evolve by a combination of extrusive volcanism, intrusive magmatism, extension, uplift, and erosion [e.g., Menzies et al , 2002]. Extension results in normal faulting, subsidence, and thinning of the crust.…”

Section: Introductionmentioning

confidence: 99%

Sedimentary, volcanic, and tectonic processes of the central Mariana Arc: Mariana Trough back‐arc basin formation and the West Mariana Ridge

Oakley

Taylor

Moore

et al. 2009

Geochem Geophys Geosyst

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[1] We present new multichannel seismic profiles and bathymetric data from the central Marianas that image the West Mariana Ridge (WMR) remnant arc, both margins of the Mariana Trough back-arc basin, the modern arc, and Eocene frontal-arc high. These data reveal structure and stratigraphy related to three periods of arc volcanism and two periods of arc rifting. We interpret the boundary between accreted backarc basin and rifted arc crust along the Mariana Trough and support these findings with drilling results and recent seismic refraction and gravity studies. We show that with the exception of a few volcanoes behind the volcanic front that straddle the boundary between crustal types, the modern Mariana Arc is built entirely on rifted arc crust between 14 and 19°N. Our data indicate that there is more accreted back-arc seafloor to the west of the Mariana Trough spreading axis than to the east, confirming previous evidence for an asymmetric basin. The rifted margin of the WMR remnant arc forms a stepped pattern along the western boundary of the Mariana Trough, between 15°30 0 and 19°N. In this region, linear volcanic cross chains behind the WMR are aligned with the trend of Mariana Trough spreading segments, and the WMR ridges extend into the back-arc basin along the same strike. These ridges are magmatic accommodation zones which, to the north along the Izu-Bonin Arc, punctuate tectonic extension. For the WMR we hypothesize that rift basins are more commonly the sites where spreading segment offsets nucleate, whereas magmatic centers of spreading segments are sites where magmatism continues from arc volcanism, through rifting to back-arc spreading. The Mariana Trough is opening nonrigidly and is characterized by two predominant abyssal hill trends, NNW-SSE in the north and N-S in the south. Between the only two basin-crossing fracture zones at 15.5 and 17.5°, N-S axes propagated north at the expense of NNW axes.

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Volcanic Rifted Margins

Cited by 55 publications

References 0 publications

Structural evolution of the Orange Basin gravity-driven system, offshore Namibia

Structural evolution of the Orange Basin gravity-driven system, offshore Namibia

Birth of a volcanic margin off Argentina, South Atlantic

Sedimentary, volcanic, and tectonic processes of the central Mariana Arc: Mariana Trough back‐arc basin formation and the West Mariana Ridge

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