Geochemistry, Geophysics, Geosystems

Description: The Central American subduction system is characterized by abundant seismicity and a prominent volcanic arc in an erosive convergent margin setting. These processes are controlled, among other parameters, by material pathways, fluid-rock interactions and reactions from the shallower to the deeper levels of subduction. We invite studies focused on the Central American subduction system that seek to develop a better understanding of the physical conditions and processes at work in the interior of the subduction zone and along the subduction thrust interface. The goal is to better understand processes controlling the origin of natural hazards at subduction zones, in particular, earthquake nucleation and rupture. International scientific focus on the Central American subduction system has resulted in a wealth of detailed datasets that include the recent acquisition of 3D reflection seismics and drilling of IODP Expeditions 334 and 344 offshore southern Costa Rica. We seek to bring together contributions from all disciplines involved with the exploration of the Central America subduction system from the incoming plate to its arc and behind-arc magmatism, with a special focus on high-resolution offshore studies, lithospheric and crustal-scale constraints on deformation processes from geophysics, geochemistry, petrology and field-based studies.

Editors: Paola Vannucchi, Robert Harris, Nathan Bangs, Guillermo Alvarado Induni
  1. Research Articles

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    2. Research Articles
    1. Neogene paleoceanography of the eastern equatorial Pacific based on the radiolarian record of IODP drill sites off Costa Rica (pages 889–906)

      María I. Sandoval, Demetrio Boltovskoy, Alan T. Baxter and Peter O. Baumgartner

      Version of Record online: 15 MAR 2017 | DOI: 10.1002/2016GC006623

      Key Points

      • Statistical analyses used to interpret paleoceanographic changes through time
      • Radiolarians as a proxy for paleoceanographic interpretations
      • Paleoceanographic events in the eastern equatorial Pacific since late Miocene
    2. Late Cenozoic tephrostratigraphy offshore the southern Central American Volcanic Arc: 2. Implications for magma production rates and subduction erosion (pages 4585–4604)

      J. C. Schindlbeck, S. Kutterolf, A. Freundt, S. M. Straub, P. Vannucchi and G. E. Alvarado

      Version of Record online: 21 NOV 2016 | DOI: 10.1002/2016GC006504

      Key Points

      • Central American Volcanic Arc volcanism
      • Magma Production rates
      • Sedimentation rates offshore Costa Rica and Nicaragua
    3. Late Cenozoic tephrostratigraphy offshore the southern Central American Volcanic Arc: 1. Tephra ages and provenance (pages 4641–4668)

      J. C. Schindlbeck, S. Kutterolf, A. Freundt, G. E. Alvarado, K.-L. Wang, S. M. Straub, S. R. Hemming, M. Frische and J. D. Woodhead

      Version of Record online: 21 NOV 2016 | DOI: 10.1002/2016GC006503

      Key Points:

      • Explosive volcanism from Costa Rica and Nicaragua
      • Provenance, tephrostratigraphy, and tephrochronology
      • IODP/ODP/DSDP drill sites
    4. Heat flow along the Costa Rica Seismogenesis Project drilling transect: Implications for hydrothermal and seismic processes (pages 2110–2127)

      Bridget Hass and Robert N. Harris

      Version of Record online: 18 JUN 2016 | DOI: 10.1002/2016GC006314

      Key Points

      • Heat flow values corrected for bathymetry and sedimentation average 15% higher than uncorrected values
      • Thermal models include the effect of hydrothermal circulation and frictional heating
      • The updip limit of seismicity is cooler than the commonly modeled 100°–150°C temperature range
    5. You have full text access to this OnlineOpen article
      Origin and dynamics of depositionary subduction margins (pages 1966–1974)

      Paola Vannucchi, Jason P. Morgan, Eli A. Silver and Jared W. Kluesner

      Version of Record online: 5 JUN 2016 | DOI: 10.1002/2016GC006259

      Key Points:

      • The description of a new mode of forearc growth
      • Forearc grows by deposition of material from “above” when material is removed from “below” by subduction erosion
      • Sections of forearcs can be totally replaced during extreme subduction erosion events
    6. You have full text access to this OnlineOpen article
      Fluid inclusion petrology and microthermometry of the Cocos Ridge hydrothermal system, IODP Expedition 344 (CRISP 2), Site U1414 (pages 1419–1434)

      Jennifer Brandstätter, Walter Kurz, Kurt Krenn and Peter Micheuz

      Version of Record online: 26 APR 2016 | DOI: 10.1002/2015GC006212

      Key Points:

      • Different fluid inclusion generations give insights into the evolution of IODP Site 344-U1414
      • Advective heat transport, probably related to the Galapagos hotspot or a spreading center close to Cocos Island, effectuated lithification of sediments of the Cocos Plate
    7. Paleomagnetic constraints on the tectonic evolution of the Costa Rican subduction zone: New results from sedimentary successions of IODP drill sites from the Cocos Ridge (pages 4479–4493)

      Yong-Xiang Li, Xixi Zhao, Luigi Jovane, Katerina E. Petronotis, Zheng Gong and Siyi Xie

      Version of Record online: 31 DEC 2015 | DOI: 10.1002/2015GC006058

      Key Points:

      • A paleomagnetic study is performed on fully oriented IODP cores drilled from the Cocos Ridge
      • A sedimentary hiatus is recognized and is constrained at 1.52 and 9.61 Ma with paleomagnetic data
      • The hiatus appears regional and is linked to the initial shallow subduction of the Cocos Ridge
    8. Hydrogeological responses to incoming materials at the erosional subduction margin, offshore Osa Peninsula, Costa Rica (pages 2725–2742)

      Jun Kameda, Robert N. Harris, Mayuko Shimizu, Kohtaro Ujiie, Akito Tsutsumi, Minoru Ikehara, Masaoki Uno, Asuka Yamaguchi, Yohei Hamada, Yuka Namiki and Gaku Kimura

      Version of Record online: 21 AUG 2015 | DOI: 10.1002/2015GC005837

      Key Points:

      • Incoming material compositions at the Costa Rica margin were examined by XRD
      • The sediment and basement contain abundant hydrous smectite and opal
      • Diagenetic reactions significantly affect fluid circulation at this margin
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      Interplate seismicity at the CRISP drilling site: The 2002 Mw 6.4 Osa Earthquake at the southeastern end of the Middle America Trench (pages 3035–3050)

      Ivonne G. Arroyo, Ingo Grevemeyer, Cesar R. Ranero and Roland von Huene

      Version of Record online: 31 JUL 2014 | DOI: 10.1002/2014GC005359

      Key Points

      • A large subduction earthquake located in the area of interplate drilling project
      • Most of the seismic energy was radiated at shallow depth below the margin slope
      • Cocos Ridge subduction creates conditions for shallower interplate seismogenesis