IODP Expedition 334; An investigation of the sedimentary record, fluid flow and state of stress on top of the seismogenic zone of an erosive subductive margin

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doi: 10.2204/iodp.sd.15.03.2013
Author(s): Vannucchi, Paola; Ujiie, Kohtaro; Stroncik, Nicole; Malinverno, Alberto; Arroyo, Yvonne; Barckhausen, Udo; Conin, Marianne J.; Foley, Susan Murr; Formolo, Michael J.; Harris, Robert N.; Heuret, Arnauld; Huftile, Gary J.; Kameda, Jun; Kim, Gil Young; Kutterolf, Steffen O.; Martino, Amanda J.; McCay, Gillian A.; Nuzzo, Marianne; Ohkushi, Ken'ichi; Saito, Saneatsu; Sak, Peter B.; Solomon, Evan A.; Stipp, Michael; Torres, Marta E.; Tsutsumi, Akito; Uno, Masaoki; Usui, Yoichi; Vadakkeyakath, Yatheesh; Yamamoto, Yuzuru; Zhao, Xixi; Zhu, Junjiang; Saltman, Jenifer
Integrated Ocean Drilling Program, Expedition 334 Scientists, College Station, TX
Author Affiliation(s): Primary:
Royal Holloway-University of London, Department of Earth Sciences, Egham, United Kingdom
Other:
University of Tsukuba, Japan
Texas A&M University, United States
Volume Title: Scientific Drilling
Source: Scientific Drilling, Vol.15, p.23-30. Publisher: Integrated Ocean Drilling Program Management International, Sapporo; Washington, DC, International. ISSN: 1816-8957
Note: In English. 33 refs.; illus., incl. geol. sketch map
Summary: The Costa Rica Seismogenesis Project (CRISP) is an experiment to understand the processes that control nucleation and seismic rupture of large earthquakes at erosional subduction zones. Integrated Ocean Drilling Program (IODP) Expedition 334 by R/V JOIDES Resolution is the first step toward deep drilling through the aseismic and seismic plate boundary at the Costa Rica subduction zone offshore the Osa Peninsula where the Cocos Ridge is subducting beneath the Caribbean plate. Drilling operations included logging while drilling (LWD) at two slope sites (Sites U1378 and U1379) and coring at three slope sites (Sites U1378-1380) and at one site on the Cocos plate (Site U1381). For the first time the lithology, stratigraphy, and age of the slope and incoming sediments as well as the petrology of the subducting Cocos Ridge have been characterized at this margin. The slope sites recorded a high sediment accumulation rate of 160-1035 m m.y.-1 possibly caused by on-land uplift triggered by the subduction of the Cocos Ridge. The geochemigeochemical data as well as the in situ temperature data obtained at the slope sites suggest that fluids are transported from greater depths. The geochemical profiles at Site U1381 reflect diffusional communication of a fluid with seawater-like chemistry and the igneous basement of the Cocos plate (Solomon et al., 2011; Vannucchi et al., 2012a). The present-day in situ stress orientation determined by borehole breakouts at Site U1378 in the middle slope and Site U1379 in the upper slope shows a marked change in stress state within ∼12 km along the CRISP transect; that may correspond to a change from compression (middle slope) to extension (upper slope).
Year of Publication: 2013
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; Basalts; Basement; Boreholes; Caribbean Plate; Caribbean region; Cocos Plate; Continental margin; Cores; Costa Rica Seismogenesis Project; Crust; East Pacific; Expedition 334; Flows; Fluid phase; IODP Site U1378; IODP Site U1379; IODP Site U1380; IODP Site U1381; Igneous rocks; Integrated Ocean Drilling Program; Marine sediments; North Pacific; Northeast Pacific; Oceanic crust; Pacific Ocean; Plate tectonics; Sedimentary rocks; Sediments; Seismicity; Stress fields; Subduction zones; Volcanic rocks
Coordinates: N083532 N083532 W0840438 W0840438
N084051 N084051 W0840201 W0840202
N083600 N083600 W0840424 W0840424
N082543 N082543 W0840928 W0840929
Record ID: 2013047786
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