An integrated age model for the Cocos Plate using IODP CRISP drilling data

Author(s): Baxter, Alan T.; Kutterolf, Steffen; Schindlbeck, Julie Christin; Sandoval, Maria I.; Barckhausen, Udo; Li Yongxiang; Petronotis, Katerina E.
Author Affiliation(s): Primary:
University of New England, Armidale, N.S.W., Australia
Other:
Helmholtz Centre for Ocean Research Kiel, Germany
University of Costa Rica, Costa Rica
Federal Institute for Geosciences and Natural Resources, Germany
Nanjing University, China
Texas A&M University, United States
Volume Title: AGU 2017 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2017; American Geophysical Union 2017 fall meeting, New Orleans, LA, Dec. 11-15, 2017. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: We present an integrated age model for the incoming Cocos Plate sediments offshore Costa Rica. The data, collected over two IODP Expeditions (334 and 344), provides a medium- to high-resolution record from the initial formation of the ocean crust in the Miocene to the present day. This study provides >50 age control points for the CRISP sediments from Sites U1381 and U1414. Although the two sites are just 10 km apart, there are distinct differences in the sediment and tephra record. Most notable is the presence of a hiatus at Site U1381. The hiatus, which is seen at other sites on the Cocos Plate, but not at Site U1414, may be related to erosion due to bottom water currents, mass wasting from Cocos Ridge subduction or may be related to the closure of the Central American Seaway (CAS). Sediment accumulation rates in the Miocene are comparable to modern abyssal plain rates. However, an increase is observed in the Pleistocene, when detritus from the forearc basin appears at Site U1414 ≈2 Ma, shortly after the initiation of Cocos Ridge subduction. A tectonic model is presented that reconstructs the Cocos Plate, from its formation at 23 Ma to the present day. Eastern Equatorial Pacific (EEP) paleoceanographic events, such as the Miocene "carbonate crash" and the Late Miocene-Early Pliocene "biogenic bloom" observed at Site U1414, are also discussed.
Year of Publication: 2017
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 18 Geophysics, Solid-Earth; Cenozoic; Cocos Plate; Costa Rica Seismogenesis Project; East Pacific; Expedition 344; IODP Site U1381; IODP Site U1414; Integrated Ocean Drilling Program; Marine environment; Marine sediments; Miocene; Neogene; North Pacific; Northeast Pacific; Pacific Ocean; Paleo-oceanography; Paleoenvironment; Plate tectonics; Pleistocene; Pliocene; Quaternary; Sediments; Tertiary
Coordinates: N082543 N082543 W0840928 W0840929
Record ID: 2018093764
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