Antarctica-New Zealand rifting and Marie Byrd Land lithospheric magmatism linked to ridge subduction and mantle plume activity

Weaver, S. D.; Storey, B. C.; Pankhurst, R. J.; Mukasa, Samuel B.; DiVenere, Victor J.; Bradshaw, J. D.

doi:10.1130/0091-7613(1994)022<0811:anzram>2.3.co;2

Cited by 154 publications

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“…6. It is likely that much of the extension took place during the Cretaceous accompanying rifting, beginning about 100 Ma [41], and separation of New Zealand around 85 Ma just prior to Chron 34 [35]. Lawver and Gahagan [42] proposed that most MBL-East Antarctic motion ceased by the time New Zealand separated from MBL based on a neat fit of the Campbell Plateau into the present Antarctic continental margin.…”

Section: Implications Of Paleomagnetic Results From Marie Byrd Landmentioning

confidence: 99%

Are the Pacific and Indo–Atlantic hotspots fixed? Testing the plate circuit through Antarctica

DiVenere

Kent

1999

Earth and Planetary Science Letters

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It is often assumed that hotspots are fixed relative to one another and thus constitute a global reference frame for measuring absolute plate motions and true polar wander. But it has long been known that the best documented hotspot track, the Hawaiian-Emperor chain, is inconsistent with the internally coherent tracks left by the Indo-Atlantic hotspots. This inconsistency is due either to unquantified motions within the plate circuit linking the Pacific with other plates, for example, between East and West Antarctica, or relative motion between the Hawaiian-Emperor and Indo-Atlantic hotspots. Analysis of recent paleomagnetic results from Marie Byrd Land in West Antarctica confirms that there has been post-100 Ma motion between West Antarctica (Marie Byrd Land) and East Antarctica. However, incorporation of this motion into the plate circuit does not account for the Cenozoic hotspot discrepancy. Comparison of an updated inventory of Pacific and non-Pacific paleomagnetic data does not show a significant systematic discrepancy, which, along with other observations, indicates that missing plate boundaries and other errors in the plate circuit play a relatively small role in the hotspot inconsistency. We conclude that most of the apparent motion between the Hawaiian-Emperor and Indo-Atlantic hotspots is real. The best-estimate average drift rate between these sets of hotspots is approximately 25 mm=yr since 65 Ma, ignoring errors in the plate circuit and a small contribution from Cenozoic motions between East and West Antarctica.

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Section: Implications Of Paleomagnetic Results From Marie Byrd Landmentioning

confidence: 99%

Are the Pacific and Indo–Atlantic hotspots fixed? Testing the plate circuit through Antarctica

DiVenere

Kent

1999

Earth and Planetary Science Letters

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“…Subduction cessation beneath the Chatham Rise Gondwana margin in the Late Cretaceous halted the southward passage of the Hikurangi Plateau. Late phase volcanism 90 -100 Ma on the plateau [Hoernle et al, 2004] can be compared with Storey et al [1999] and Weaver et al [1994] who have proposed a mantle plume source for $107 Ma alkaline Cretaceous dikes formed in Marie Byrd Land. Initiation of rifting and subsequent seafloor spreading between New Zealand and Antarctica appears related principally to the subduction of the Hikurangi Plateau beneath the Gondwana convergent margin and the subsequent accommodation of extensional forces south of the Chatham Rise [Davy, 2004].…”

Section: Discussionmentioning

confidence: 99%

“…[49] A plume stem, originally derived from the Hikurangi Plateau LIP volcanism, could have migrated across the present Campbell Plateau SubAntarctic Margin influencing continental breakup dynamics $90 -80 Ma [Weaver et al, 1994].…”

Section: Discussionmentioning

confidence: 99%

Bollons Seamount and early New Zealand–Antarctic seafloor spreading

Davy

2006

Geochem Geophys Geosyst

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[1] Magnetic anomaly, swath bathymetry and gravity data from the southern Chatham Rise to Bollons Seamount region reveal a history of Cretaceous seafloor spreading in the mouth of the Bounty Trough starting at $85 Ma followed by spreading ridge jumps back to the Marie Byrd Land Margin at 83.7 and 78.5 Ma. The latter ridge jump accompanied the rifting of the Bollons Seamount from the Marie Byrd Land margin. Interpreted magnetic anomalies indicate a pattern of highly asymmetric spreading prior to 78 Ma that varied in bias along the margin on a $100 km length scale. Crustal thickening within the $50 km Bollons Gap linking the Bollons Seamount to the Campbell Plateau is interpreted to be due to excess volcanism associated with the initial rifting-seafloor spreading process and possible thinned continental crust. The elevated 200 km long segment of Antipodes Fracture Zone southeast of Bollons Seamount has been exposed to varying styles of ridge end volcanism and possible normal compression associated with the development during chron 32n.2n of a triple junction at its southeastern limit marking the Bellingshausen-Marie Byrd Land plate boundary.

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“…In eastern Gondwana, igneous rocks of Early Cretaceous age are widespread, occurring primarily in eastern Queensland Bryan et al, 1997), as well as New Zealand (e.g. Mortimer and Tulloch, 1996, and references therein; Muir et al, 1994;Waight et al, 1997), Marie Byrd Land (Pankhurst et al, 1993;Weaver et al, 1994), and Lord Howe Rise (McDougall and van der Lingen, 1974).…”

Section: Regional Settingmentioning

confidence: 99%

The Whitsunday Volcanic Province, Central Queensland, Australia: lithological and stratigraphic investigations of a silicic-dominated large igneous province

Bryan

Ewart

Stephens³

et al. 2000

Journal of Volcanology and Geothermal Research

100

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Contrary to general belief, not all large igneous provinces (LIPs) are characterised by rocks of basaltic composition. Silicicdominated LIPs, such as the Whitsunday Volcanic Province of NE Australia, are being increasingly recognised in the rock record. These silicic LIPs are consistent in being: (1) volumetrically dominated by ignimbrite; (2) active over prolonged periods (40-50 m.y.), based on available age data; and (3) spatially and temporally associated with plate break-up. This silicicdominated LIP, related to the break-up of eastern continental Gondwana, is also significant for being the source of Ͼ 1:4 × 10 6 km 3 of coeval volcanogenic sediment preserved in adjacent sedimentary basins of eastern Australia. The Whitsunday Volcanic Province is volumetrically dominated by medium-to high-grade, dacitic to rhyolitic lithic ignimbrites. Individual ignimbrite units are commonly between 10 and 100 m thick, and the ignimbrite-dominated sequences exceed 1 km in thickness. Coarse lithic lag breccias containing clasts up to 6 m diameter are associated with the ignimbrites in proximal sections. Pyroclastic surge and fallout deposits, subordinate basaltic to rhyolitic lavas, phreatomagmatic deposits, and locally significant thicknesses of coarse-grained volcanogenic conglomerate and sandstone are interbedded with the ignimbrites. The volcanic sequences are intruded by gabbro/dolerite to rhyolite dykes (up to 50 m in width), sills and comagmatic granite. Dyke orientations are primarily from NW to NNE.The volcanic sequences are characterised by the interstratification of proximal/near-vent lithofacies such as rhyolite domes and lavas, and basaltic agglomerate, with medial to distal facies of ignimbrite. The burial of these near-vent lithofacies by ignimbrites, coupled with the paucity of mass wastage products such as debris-flow deposits indicates a low-relief depositional environment. Furthermore, the volcanic succession records a temporal change in: (1) eruptive styles; (2) the nature of source vents; and (3) erupted compositions. An early explosive dacitic pyroclastic phase was succeeded by a later mixed pyroclasticeffusive phase producing an essentially bimodal suite of lavas and rhyolitic ignimbrite. volcanic lithofacies, the volcanic sequences are interpreted to record the evolution of a multiple vent, low-relief volcanic region, dominated by several large caldera centres. ᭧

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Antarctica-New Zealand rifting and Marie Byrd Land lithospheric magmatism linked to ridge subduction and mantle plume activity

Cited by 154 publications

References 0 publications

Are the Pacific and Indo–Atlantic hotspots fixed? Testing the plate circuit through Antarctica

Are the Pacific and Indo–Atlantic hotspots fixed? Testing the plate circuit through Antarctica

Bollons Seamount and early New Zealand–Antarctic seafloor spreading

The Whitsunday Volcanic Province, Central Queensland, Australia: lithological and stratigraphic investigations of a silicic-dominated large igneous province

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