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GEOREF RECORD

Nicaraguan volcanoes record paleoceanographic changes accompanying closure of the Panama gateway

Terry Plank, Vaughn Balzer and Michael Carr
Nicaraguan volcanoes record paleoceanographic changes accompanying closure of the Panama gateway
Geology (Boulder) (December 2002) 30 (12): 1087-1090

Abstract

A major oceanographic event preserved in the Cocos plate sedimentary column survived subduction and is recorded in the changing composition of Nicaraguan magmas. A uranium increase in these magmas since the latest Miocene (after 7 Ma) resulted from the "carbonate crash" at 10 Ma and the ensuing high organic carbon burial in the sediments. The response of the arc to this paleoceanographic event requires near steady-state sediment recycling at this margin since 20 Ma. This relative stability in sediment subduction invites one of the first attempts to balance sedimentary input and arc output across a subduction zone. Calculations based on Th indicate that as much as 75% of the sedimentary column was subducted beneath the arc. The Nicaraguan margin is one of the few places to observe such strong links between the oceans and the solid earth.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 30
Serial Issue: 12
Title: Nicaraguan volcanoes record paleoceanographic changes accompanying closure of the Panama gateway
Affiliation: Boston University, Department of Earth Sciences, Boston, MA, United States
Pages: 1087-1090
Published: 200212
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 39
Accession Number: 2002-079377
Categories: StratigraphyGeochemistry of rocks, soils, and sediments
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch maps
S03°05'48" - N11°13'26", W110°34'19" - W90°28'51"
N12°40'00" - N13°10'00", W91°10'00" - W90°49'60"
Secondary Affiliation: University of Kansas, USA, United StatesRutgers University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200224
Program Name: ODPOcean Drilling Program
Program Name: DSDPDeep Sea Drilling Project
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