Rates of sediment recycling beneath the Acapulco trench: Constraints from (U-Th)/He thermochronology

Mihai N Ducea, Victor A. Valencia, Sarah Shoemaker, Peter W Reiners, Peter G Decelles, Maria Fernanda Campa, Dante Morán-Zenteno, Joaquin Ruiz

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

The Sierra Madre del Sur mountain range is an uplifted forearc associated with the subduction of the Cocos plate along the Acapulco trench beneath mainland southern Mexico. The shallow subduction angle, the truncation of geologic features along the modern Acapulco trench, and direct seismic and drill hole observations in the trench through deep sea drilling data suggest that subduction erosion is an important process during the evolution of this margin. Turbidites derived from the uplifted forearc are the predominant sedimentary input into this trench, while pelagic sediments are subordinate. Apatite (U-Th)/He ages were obtained on 23 samples from two transects across the Sierra Madre del Sur (Acapulco and Puerto Escondido) and reveal slow cooling during the Miocene. (U-Th)/He ages range between ∼25 and 8 Ma and correlate inversely with elevation. Long-term erosional exhumation rates inferred from these ages range from 0.11 to 0.33 km/m.y., with higher rates in the range core, and suggest that the Sierra Madre del Sur has been a slowly decaying mountain range, since at least the early Miocene. Apparent Miocene-Pliocene sedimentation ("preservation") rates in the Acapulco trench derived from Deep Sea Drilling Project data are about an order of magnitude smaller than the Miocene forearc erosion rates estimated from (U-Th)/He ages, suggesting that the terrigenous input to the trench was almost entirely recycled via subduction erosion, at least during the Miocene. The Miocene subducted flux per unit length of the margin is about 30 km3/(km m.y.), or a subducted volume per unit time of 44 × 103 km3/m.y., when integrated over the length of the trench.

Original languageEnglish (US)
JournalJournal of Geophysical Research: Space Physics
Volume109
Issue number9
DOIs
StatePublished - Sep 10 2004

Fingerprint

thermochronology
recycling
trench
Recycling
Erosion
Sediments
sediments
erosion
Miocene
Drilling
drilling
mountains
sediment
subduction
margins
Apatites
Sedimentation
Mexico
apatites
Fluxes

Keywords

  • (U-Th)/He thermochronology
  • Acapulco trench
  • Subduction erosion

ASJC Scopus subject areas

  • Oceanography
  • Astronomy and Astrophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences (miscellaneous)
  • Geophysics
  • Geochemistry and Petrology

Cite this

Rates of sediment recycling beneath the Acapulco trench : Constraints from (U-Th)/He thermochronology. / Ducea, Mihai N; Valencia, Victor A.; Shoemaker, Sarah; Reiners, Peter W; Decelles, Peter G; Campa, Maria Fernanda; Morán-Zenteno, Dante; Ruiz, Joaquin.

In: Journal of Geophysical Research: Space Physics, Vol. 109, No. 9, 10.09.2004.

Research output: Contribution to journalArticle

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