Convection of North Pacific Deep Water during the early Cenozoic

The history of deep water formation and abyssal flow is poorly known but important to establish in order to develop a better understanding of changes in oceanic mass, heat, salt, and nutrient transport. North Atlantic high-latitude regions currently are the dominant deep water producers, but paleoge...

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Bibliographic Details
Published in:Geology (Boulder) 2012-06, Vol.40 (6), p.527-530
Main Authors: Hague, Ashley M, Thomas, Deborah J, Huber, Matthew, Korty, Robert, Woodard, Stella C, Jones, L. Blake
Format: Article
Language:English
Subjects:
bioclastic sedimentation
Carbon dating
Cenozoic
Climate
convection
Cretaceous
Deep Sea Drilling Project
deep-water environment
Detroit Seamount
DSDP Site 192
DSDP Site 464
DSDP Site 465
Emperor Seamounts
Fossils
Hess Rise
IPOD
Leg 145
Leg 19
Leg 198
Leg 62
lower Cenozoic
Marine geology
marine sediments
Mesozoic
North Pacific
North Pacific Deep Water
Northwest Pacific
Ocean Drilling Program
Oceanography
ODP Site 1208
ODP Site 883
ODP Site 884
Pacific Ocean
paleo-oceanography
paleocirculation
Paleogene
sedimentation
sediments
Shatsky Rise
Silica
silicates
Simulation
Stratigraphy
Tertiary
Upper Cretaceous
West Pacific
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Summary:The history of deep water formation and abyssal flow is poorly known but important to establish in order to develop a better understanding of changes in oceanic mass, heat, salt, and nutrient transport. North Atlantic high-latitude regions currently are the dominant deep water producers, but paleogeographic constraints, proxy interpretations, and physical models have suggested other modes for the past, such as those characterized by high-latitude Pacific sources, subtropical sources, or widespread, nonlocalized sources. Here we present new North Pacific Late Cretaceous-Paleogene Nd isotope data from fossil fish debris and detrital silicates, combined with results of coupled climate model simulations to test these hypothesized circulation modes. The data and model simulations support a circulation mode characterized by high-latitude, bipolar Pacific convection. Deep convection in the North Pacific, and likely the South Pacific, was most intense during the relatively "cool" portion of the Late Cretaceous-Paleocene and waned prior to the peak global warmth of the Early Eocene (ca. 52 Ma).
ISSN:0091-7613
1943-2682
DOI:10.1130/G32886.1