Sediment Accumulation Rates of the Lesser Antilles Intraoceanic Island Arc, Deep Sea Drilling Project Leg 78A

Wright, A.

doi:10.2973/dsdp.proc.78a.114.1984

Cited by 10 publications

(4 citation statements)

References 18 publications

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“…The sedimentation rate in this age-J o u r n a l P r e -p r o o f 19 depth model is almost linear, but it is not well-constrained before the MBB because of the presence of thicker RDL (> 5 cm), and fewer δ 18 O and paleomagnetic tie points. Nonetheless, the low sedimentation rates are similar to published data from the accretionary prism sediments with Brunhes Chron sedimentation rates between 1 and 3 cm/kyr (Damuth, 1977;Reid et al, 1996) and they are slightly lower than the sedimentation rate reported at 3 km landward of the Barbados subduction deformation front DSDP Site 541 (Wright, 1984), which is about 5 cm/kyr for the Quaternary epoch. This age-depth model is validated by comparison of our data with the stacks mentioned above (Fig.…”

Section: Final Age Model and Paleomagnetic Recordsupporting

confidence: 88%

Regional chronostratigraphy in the eastern Lesser Antilles quaternary fore-arc and accretionary wedge sediments: Relative paleointensity, oxygen isotopes and reversals

Bieber

St‐Onge

Feuillet

et al. 2021

Quaternary Geochronology

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Section: Final Age Model and Paleomagnetic Recordsupporting

confidence: 88%

Regional chronostratigraphy in the eastern Lesser Antilles quaternary fore-arc and accretionary wedge sediments: Relative paleointensity, oxygen isotopes and reversals

Bieber

St‐Onge

Feuillet

et al. 2021

Quaternary Geochronology

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“…(a) Carbonate carbon concentration and δ 13 C values of Site 543 sediments and AOC (grey circle: δ 13 C values; empty circle: carbon concentration). Carbonate carbon concentration data is from Wright (1984). (b) Organic carbon concentration and δ 13 C values of Site 543 sediments and AOC.…”

Section: Geological Backgroundmentioning

confidence: 99%

Section: Sedimentary Carbon Inputmentioning

confidence: 99%

“…In the sediments below the décollement at Site 543, carbonate mainly concentrates in a ~32-m-thick layer (Unit 6; Figure 2) with calcareous ferruginous claystone (Wright, 1984). The concentrations of carbonate carbon vary from 0 ppm to 63,840 ppm with a weighted average value of 4,157 ppm (Wright, 1984; Figure 2 and Table S1). The δ 13 C values of carbonate were only measured for two samples in Unit 6 (see Text S1 for methods and Figure 2 and Table S2 for data), which gave a weighted average value of 2.0‰ (Figure 2 and Table S1).…”

Section: Sedimentary Carbon Inputmentioning

confidence: 99%

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Efficient Carbon Recycling at the Central‐Northern Lesser Antilles Arc: Implications to Deep Carbon Recycling in Global Subduction Zones

Aubaud

et al. 2020

Geophysical Research Letters

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Carbon recycling efficiency of arc (CREA) is an important parameter to assess the recycling of slab carbon into Earth's deep interior. Although previous studies observed variable degrees of recycled slab carbon at global arcs, the CREA value of any individual subduction zone has not been obtained due to the loose constraints on carbon budget in altered oceanic crust (AOC). Here, through estimates of carbon input by both sediments and AOC at DSDP Site 543 and recycled carbon output from major volcanoes in the Central-Northern Lesser Antilles, we show an extremely efficient carbon recycling case, with the CREA value reaching 100 ±27 %. Nearly complete slab carbon release at sub-arc depth implies little carbon has been lost in the forearc region or subducted into the deep mantle in this subduction zone. Our results highlight strongly variable CREA on a global scale, which must be considered in the modeling of global deep carbon cycle.Plain Language Summary Subduction zones are the major channel to deliver crustal carbon into the mantle. However, the fate of crustal carbon at a variety of depth (e.g., forearc, sub-arc, beyond arc) in the subduction channel is poorly quantified, which is an obstacle to our understanding of the deep carbon cycle. Here, we assessed the carbon recycling efficiency in the Central-Northern Lesser Antilles arc by comparing the carbon input flux (estimated from data of the subducting slab recovered by DSDP drillings) with carbon output flux (estimated based on volcanic emission data). We found that the subducted crustal carbon was nearly completely recycled by arc volcanism in the Central-Northern Lesser Antilles. This implies little carbon loss within the forearc region and little carbon subducted into the deep mantle in the Central-Northern Lesser Antilles, which differs from some other subduction zones (e.g., the Izu-Bonin-Mariana and Central America) that show low carbon recycling efficiencies. Our discovery highlights that the carbon recycling in subduction zone is highly variable on a global scale.

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Contrasting sedimentary processes along a convergent margin: the Lesser Antilles arc system

2006

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Sediment Accumulation Rates of the Lesser Antilles Intraoceanic Island Arc, Deep Sea Drilling Project Leg 78A

Cited by 10 publications

References 18 publications

Regional chronostratigraphy in the eastern Lesser Antilles quaternary fore-arc and accretionary wedge sediments: Relative paleointensity, oxygen isotopes and reversals

Regional chronostratigraphy in the eastern Lesser Antilles quaternary fore-arc and accretionary wedge sediments: Relative paleointensity, oxygen isotopes and reversals

Efficient Carbon Recycling at the Central‐Northern Lesser Antilles Arc: Implications to Deep Carbon Recycling in Global Subduction Zones

Contrasting sedimentary processes along a convergent margin: the Lesser Antilles arc system

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