Crustal redistribution, crust-mantle recycling and Phanerozoic evolution of the continental crust

Peter D Clift (Corresponding Author), Paola Vannucchi, Jason Phipps Morgan

Research output: Contribution to journalArticle

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Abstract

We here attempt a global scale mass balance of the continental crust during the Phanerozoic and especially the Cenozoic (65 Ma). Continental crust is mostly recycled back into the mantle as a result of the subduction of sediment in trenches (1.65 km3/a), by the subduction of eroded forearc basement (1.3 km3/a) and by the delamination of lower crustal material from orogenic plateaus (ca. 1.1 km3/a). Subduction of rifted crust in continent–continent collision zones (0.4 km3/a), and dissolved materials fixed into the oceanic crust (ca. 0.4 km3/a) are less important crustal sinks. At these rates the entire continental crust could be reworked in around 1.8 Ga. Nd isotope data indicate that ca. 80% of the subducted continental crust is not recycled by melting at shallow levels back into arcs, but is subducted to depth into the upper mantle. Continent–continent collision zones do not generally form new crust, but rather cause crustal loss by subduction and as a result of their physical erosion, which exports crust from the orogen to ocean basins where it may be subducted. Regional sedimentation rates suggest that most orogens have their topography eliminated within 100–200 million years. We estimate that during the Cenozoic the global rivers exported an average of 1.8 km3/a to the oceans, approximately balancing the subducted loss. Accretion of sediment to active continental margins is a small contribution to crustal construction (ca. 0.3 km3/a). Similarly, continental large igneous provinces (flood basalts) represent construction of only around 0.12 km3/a, even after accounting for their intrusive roots. If oceanic plateaus are accreted to continental margins then they would average construction rates of 1.1 km3/a, meaning that to keep constant crustal volumes, arc magmatism would have to maintain production of around 3.8 km3/a (or 94 km3/Ma/km of trench). This slightly exceeds the rates derived from sparse seismic experiments in oceanic arc systems. Although the crust appears to be in a state of rough equilibrium during the Phanerozoic, 200–300 million years cycles in sealevel may be governed in part by periods of crustal growth and destruction. During the Cenozoic the crustal volume may be running a long term loss of < 1.8 km3/a, meaning that arc production rates could be as low at 2.0 km3/a (50 km3/Ma/km), if sealevel fall approaches 175 m since 65 Ma. Periods of orogeny cause crustal thickening and enhanced loss via subduction and delamination, effectively increasing the size of the ocean basins and thus freeboard.
Original languageEnglish
Pages (from-to)80-104
Number of pages25
JournalEarth Science Reviews
Volume97
Issue number1-4
Early online date14 Oct 2009
DOIs
Publication statusPublished - Dec 2009

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Phanerozoic
continental crust
trench
recycling
crust
mantle
subduction
collision zone
delamination
ocean basin
continental margin
plateau
large igneous province
flood basalt
crustal thickening
orogeny
sedimentation rate
oceanic crust
sediment
upper mantle

Keywords

  • subduction
  • delamination
  • erosion
  • recycling

Cite this

Crustal redistribution, crust-mantle recycling and Phanerozoic evolution of the continental crust. / Clift, Peter D (Corresponding Author); Vannucchi, Paola; Phipps Morgan, Jason.

In: Earth Science Reviews, Vol. 97, No. 1-4, 12.2009, p. 80-104.

Research output: Contribution to journalArticle

Clift, Peter D ; Vannucchi, Paola ; Phipps Morgan, Jason. / Crustal redistribution, crust-mantle recycling and Phanerozoic evolution of the continental crust. In: Earth Science Reviews. 2009 ; Vol. 97, No. 1-4. pp. 80-104.
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AU - Phipps Morgan, Jason

N1 - PC thanks the College of Physical Sciences, University of Aberdeen for assistance in conducting this study. PC wishes to thank Kevin Burke, Youngsook Huh, Amy Draut and Oliver Jagoutz for their advice during writing of this paper. The paper benefited from helpful reviews by Peter Cawood and Chris Hawkesworth.

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N2 - We here attempt a global scale mass balance of the continental crust during the Phanerozoic and especially the Cenozoic (65 Ma). Continental crust is mostly recycled back into the mantle as a result of the subduction of sediment in trenches (1.65 km3/a), by the subduction of eroded forearc basement (1.3 km3/a) and by the delamination of lower crustal material from orogenic plateaus (ca. 1.1 km3/a). Subduction of rifted crust in continent–continent collision zones (0.4 km3/a), and dissolved materials fixed into the oceanic crust (ca. 0.4 km3/a) are less important crustal sinks. At these rates the entire continental crust could be reworked in around 1.8 Ga. Nd isotope data indicate that ca. 80% of the subducted continental crust is not recycled by melting at shallow levels back into arcs, but is subducted to depth into the upper mantle. Continent–continent collision zones do not generally form new crust, but rather cause crustal loss by subduction and as a result of their physical erosion, which exports crust from the orogen to ocean basins where it may be subducted. Regional sedimentation rates suggest that most orogens have their topography eliminated within 100–200 million years. We estimate that during the Cenozoic the global rivers exported an average of 1.8 km3/a to the oceans, approximately balancing the subducted loss. Accretion of sediment to active continental margins is a small contribution to crustal construction (ca. 0.3 km3/a). Similarly, continental large igneous provinces (flood basalts) represent construction of only around 0.12 km3/a, even after accounting for their intrusive roots. If oceanic plateaus are accreted to continental margins then they would average construction rates of 1.1 km3/a, meaning that to keep constant crustal volumes, arc magmatism would have to maintain production of around 3.8 km3/a (or 94 km3/Ma/km of trench). This slightly exceeds the rates derived from sparse seismic experiments in oceanic arc systems. Although the crust appears to be in a state of rough equilibrium during the Phanerozoic, 200–300 million years cycles in sealevel may be governed in part by periods of crustal growth and destruction. During the Cenozoic the crustal volume may be running a long term loss of < 1.8 km3/a, meaning that arc production rates could be as low at 2.0 km3/a (50 km3/Ma/km), if sealevel fall approaches 175 m since 65 Ma. Periods of orogeny cause crustal thickening and enhanced loss via subduction and delamination, effectively increasing the size of the ocean basins and thus freeboard.

AB - We here attempt a global scale mass balance of the continental crust during the Phanerozoic and especially the Cenozoic (65 Ma). Continental crust is mostly recycled back into the mantle as a result of the subduction of sediment in trenches (1.65 km3/a), by the subduction of eroded forearc basement (1.3 km3/a) and by the delamination of lower crustal material from orogenic plateaus (ca. 1.1 km3/a). Subduction of rifted crust in continent–continent collision zones (0.4 km3/a), and dissolved materials fixed into the oceanic crust (ca. 0.4 km3/a) are less important crustal sinks. At these rates the entire continental crust could be reworked in around 1.8 Ga. Nd isotope data indicate that ca. 80% of the subducted continental crust is not recycled by melting at shallow levels back into arcs, but is subducted to depth into the upper mantle. Continent–continent collision zones do not generally form new crust, but rather cause crustal loss by subduction and as a result of their physical erosion, which exports crust from the orogen to ocean basins where it may be subducted. Regional sedimentation rates suggest that most orogens have their topography eliminated within 100–200 million years. We estimate that during the Cenozoic the global rivers exported an average of 1.8 km3/a to the oceans, approximately balancing the subducted loss. Accretion of sediment to active continental margins is a small contribution to crustal construction (ca. 0.3 km3/a). Similarly, continental large igneous provinces (flood basalts) represent construction of only around 0.12 km3/a, even after accounting for their intrusive roots. If oceanic plateaus are accreted to continental margins then they would average construction rates of 1.1 km3/a, meaning that to keep constant crustal volumes, arc magmatism would have to maintain production of around 3.8 km3/a (or 94 km3/Ma/km of trench). This slightly exceeds the rates derived from sparse seismic experiments in oceanic arc systems. Although the crust appears to be in a state of rough equilibrium during the Phanerozoic, 200–300 million years cycles in sealevel may be governed in part by periods of crustal growth and destruction. During the Cenozoic the crustal volume may be running a long term loss of < 1.8 km3/a, meaning that arc production rates could be as low at 2.0 km3/a (50 km3/Ma/km), if sealevel fall approaches 175 m since 65 Ma. Periods of orogeny cause crustal thickening and enhanced loss via subduction and delamination, effectively increasing the size of the ocean basins and thus freeboard.

KW - subduction

KW - delamination

KW - erosion

KW - recycling

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DO - 10.1016/j.earscirev.2009.10.003

M3 - Article

VL - 97

SP - 80

EP - 104

JO - Earth Science Reviews

JF - Earth Science Reviews

SN - 0012-8252

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ER -