The Lord Howe Rise Rhyolites

Lingen, G. J. van der

doi:10.2973/dsdp.proc.21.115.1973

Cited by 7 publications

(7 citation statements)

References 11 publications

(22 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…DSDP legs 21, 29, and 90 have investigated the Lord Howe Rise and Challenger Plateau. The discovery of rhyolites dated at 97 ± 4 Ma at the base of a generally undisturbed sequence of Cretaceous‐Cenozoic marine sediments in DSDP Borehole 207 and a similar sedimentary sequence in DSDP Borehole 208 is consistent with the hypothesis that the Lord Howe Rise rifted from Australia during Cretaceous inception of Tasman Sea spreading and has been in a passive setting since then [ Burns and Andrews , 1973; Tulloch et al , 2009; van der Lingen , 1973]. However, a significant unconformity of Eocene to Miocene age was recognized in DSDP boreholes on the Lord Howe Rise and in the New Caledonia Trough (Figure 2), and unconformity development was inferred to have been associated with and caused by significant regional oceanographic changes at that time [ Burns and Andrews , 1973; Kennett et al , 1975, 1986].…”

Section: Stratigraphy Of Lord Howe Risementioning

confidence: 58%

Lithosphere delamination with foundering of lower crust and mantle caused permanent subsidence of New Caledonia Trough and transient uplift of Lord Howe Rise during Eocene and Oligocene initiation of Tonga-Kermadec subduction, western Pacific

et al. 2010

View full text Add to dashboard Cite

We use seismic reflection and rock sample data to propose that the first‐order physiography of New Caledonia Trough and Norfolk Ridge formed in Eocene and Oligocene time and was associated with the onset of subduction and back‐arc spreading at the Australia‐Pacific plate boundary. Our tectonic model involves an initial Cretaceous rift that is strongly modified by Cenozoic subduction initiation. Hence, we are able to explain (1) complex sedimentary basins of inferred Mesozoic age; (2) a prominent unconformity and onlap surface of middle Eocene to early Miocene age at the base of flat‐lying sediments beneath the axis of New Caledonia Trough; (3) gently dipping, variable thickness, and locally deformed Late Cretaceous strata along the margins of the trough; (4) platform morphology and unconformities on either side of the trough that indicate a phase of late Eocene to early Miocene uplift to near sea level, followed by rapid Oligocene and Miocene subsidence of ∼1100–1800 m; and (5) seismic reflection facies tied to boreholes that suggest absolute tectonic subsidence at the southern end of New Caledonia Trough by 1800–2200 m since Eocene time. The Cenozoic part of the model involves delamination and subduction initiation followed by rapid foundering and rollback of the slab. This created a deep (>2 km) enclosed oceanic trough, ∼2000 km long and 200–300 km across, in Eocene and Oligocene time as the lower crust detached, with simultaneous uplift and local land development along basin flanks. Disruption of Late Cretaceous and Paleogene strata was minimal during this Cenozoic phase and involved only subtle tilting and local reverse faulting or folding. Basin formation was possible through the action of at least one detachment fault that allowed the lower crust to either be subducted into the mantle or exhumed eastward into Norfolk Basin. We suggest that delamination of the lithosphere, with possible mixing of the lower crust back into the mantle, is more widespread than previously thought and may be commonly associated with subduction initiation, such as Cenozoic events in the Mediterranean and western Pacific.

show abstract

Section: Stratigraphy Of Lord Howe Risementioning

confidence: 58%

Lithosphere delamination with foundering of lower crust and mantle caused permanent subsidence of New Caledonia Trough and transient uplift of Lord Howe Rise during Eocene and Oligocene initiation of Tonga-Kermadec subduction, western Pacific

et al. 2010

View full text Add to dashboard Cite

show abstract

“…18-3, 144-150 20-3, 144-150 22-3, 144-150 24-3, 144-150 26-3, 144-150 28-3, 144-150 31-3, 140-150 33-3, 140-150 35-3, 140-150 37-3, 140-150 39-3, 140-150 41-3, 140-150 Site 593 1-4, 144-150 4-3, 144-150 6-3, 144-150 8-1, 144-150 12-3, 144-150 14-3, 144-150 16-3, 144-150 18-3, 144-150 20-3, 144-150 22-3, 144-150 24-3, 144-150 26-3, 144-150 28-3, 144-150 30-3, 144-150 32-2, 144-150 34-2, 144-150 36-2, 144-150 38-3, 144-150 40-3, 144-150 42-3, 144-150 44-3, 144-150 46-3, 144-150 47-3, 144-150 48-3, 144-150 50-3, 144-150 54-2, 144-150 56-3, 144-150 58-1, 140-150 60-3, 144-150 Hole 594 2-3, 144-150 4-3, 144-150 6-3, 144-150 8-3, 144-150 10-1, 144-150 12-3, 144-150 15-3, 144-150 18-3, 144-150 20-3, 144-150 24-3, 144-150 26-3, 144-150 28-3, 144-150 30-3, 144-150 34-3, 144-150 36-3, 144-150 38-2, 144-150 40-3, 144-150 42-3, 144-150 44-3, 144- Figure 3. Pore-water concentrations of calcium, magnesium, strontium, sulfate, lithium, and silica as a function of sub-bottom depth at Site 591. port for the hypothesis that the entire Lord Howe Rise has an affinity with continental crust (van der Lingen, 1973;Willcox et al, 1980). The minor amount of curvature (toward lower magnesium values) displayed in Figure 7 is consistent with some volcanic ash alteration within the sediment column (Gieskes and Lawrence, 1981), particularly at Sites 590 and 591.…”

Section: Core-section (Interval In Cm)mentioning

confidence: 99%

Pore-Water Chemistry of Carbonate-Rich Sediments, Lord Howe Rise, Southwest Pacific Ocean

Baker¹

1986

Initial Reports of the Deep Sea Drilling Project

View full text Add to dashboard Cite

About 200 pore-water samples were recovered and analyzed from eight sites of DSDP Leg 90. At all sites on the carbonate-rich Lord Howe Rise, Ca 2+ concentrations increase and Nig 2 " 1 " concentrations decrease with increasing sub-bottom depth. The value of ΔCa 2+ /ΔMg 2+ averages -0.45 mol/mol at these sites, an unusually small negative value in comparison with sites on basaltic crust. This supports the argument that the crust of the Lord Howe Rise is siliceous. Li + concentrations increase and K + concentrations decrease with depth. Both of these constituents are affected by reactions within the sediment column. Microbial sulfate reduction occurs to a small extent at all sites. In the upper 200 m of Site 594 on the south side of the Chatham Rise, sulfate reduction and alkalinity production are more pronounced.Carbonate recrystallization is indicated by large increases in Sr 2+ concentrations with depth at all sites. The exact value of the Sr 2+ maximum at each site is determined by equilibrium with respect to celestite (SrSO 4 ). The greater the degree of microbial sulfate reduction, the higher is the pore water Sr 2+ concentration. The diffusive flux of Sr 2 out of the pore waters is consistent with an initial rate of carbonate recrystallization of 10%/m.y. This recrystallization must alter the isotopic and trace elemental compositions of some carbonate components.

show abstract

“…The rhyolitic units were dated by the K/Ar method and yielded an age of 93.7 ±1.2 Ma. The rhyolite is overlain by Maestrichtian sandstone and silty claystone (van der Lingen, 1973).…”

Section: Lord Howe Rise and Norfolk Ridgementioning

confidence: 99%

“…In DSDP Hole 207 on the Lord Howe Rise (Burns and Andrews, 1973), 140 m of Late Cretaceous (93.7 ±1.2 Ma) rhyolitic lavas was encountered. The rhyolites, tuffs, and fragmental rocks are interpreted as having formed subaerially or in shallow water (van der Lingen, 1973). The bottom of the rhyolitic series was not reached; they are overlain by Upper Cretaceous (Maestrichtian) silty claystone deposited in a shallow-marine environment (van der Lingen, 1973;Burns and Andrews, 1973).…”

Section: Sites 840 and 841 Summarymentioning

confidence: 99%

“…The rhyolites, tuffs, and fragmental rocks are interpreted as having formed subaerially or in shallow water (van der Lingen, 1973). The bottom of the rhyolitic series was not reached; they are overlain by Upper Cretaceous (Maestrichtian) silty claystone deposited in a shallow-marine environment (van der Lingen, 1973;Burns and Andrews, 1973). Cretaceous rhyolites are also recorded from New Caledonia (Paris and Lille, 1977).…”

Section: Sites 840 and 841 Summarymentioning

confidence: 99%

See 1 more Smart Citation

Introduction

1992

Proceedings of the Ocean Drilling Program

View full text Add to dashboard Cite

The Lord Howe Rise Rhyolites

Cited by 7 publications

References 11 publications

Lithosphere delamination with foundering of lower crust and mantle caused permanent subsidence of New Caledonia Trough and transient uplift of Lord Howe Rise during Eocene and Oligocene initiation of Tonga-Kermadec subduction, western Pacific

Lithosphere delamination with foundering of lower crust and mantle caused permanent subsidence of New Caledonia Trough and transient uplift of Lord Howe Rise during Eocene and Oligocene initiation of Tonga-Kermadec subduction, western Pacific

Pore-Water Chemistry of Carbonate-Rich Sediments, Lord Howe Rise, Southwest Pacific Ocean

Introduction

Contact Info

Product

Resources

About