Pacific Neogene carbonate accumulation rates


I have compiled CaCO3 mass accumulation rates (MARs) for the period 0–25 Ma for 144 Deep Sea Drilling Project and Ocean Drilling Program drill sites in the Pacific in order to investigate the history of CaCO3 burial in the world's largest ocean basin. This is the first synthesis of data since the beginning of the Ocean Drilling Program. Sedimentation rates, CaCO3 contents, and bulk density were estimated for 0.5 Myr time intervals from 0 to 14 Ma and for 1 Myr time intervals from 14 to 25 Ma using mostly data from Initial Reports volumes. There is surprisingly little coherence between CaCO3 MAR time series from different Pacific regions, although regional patterns exist. A transition from high to low CaCO3 MAR from 23–20 Ma is the only event common to the entire Pacific Ocean. This event is found worldwide. The most likely cause of lowered pelagic carbonate burial is a rising sea-level trend in the early Miocene. The central and eastern equatorial Pacific is the only region with adequate drill site coverage to study carbonate compensation depth (CCD) changes in detail for the entire Neogene. The latitude-dependent decrease in CaCO3 production away from the equator is an important defining factor of the regional CCD, which shallows away from the equatorial region. Examination of latitudinal transects across the equatorial region is a useful way to separate the effects of changes in carbonate production ('productivity') from changes in bottom water chemistry ('dissolution') upon carbonate burial.

Supplement to: Lyle, Mitchell W (2003): Neogene carbonate burial in the Pacific Ocean. Paleoceanography, 18(3), 1059

Related Identifier
Metadata Access
Creator Lyle, Mitchell W ORCID logo
Publisher PANGAEA
Publication Year 2015
Rights Creative Commons Attribution 3.0 Unported;
OpenAccess true
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 80882 data points
Discipline Earth System Research
Spatial Coverage (-81.044W, -68.997S, 110.112E, 56.956N); North Pacific/PLAIN; North Pacific/HILL; North Pacific/VALLEY; North Pacific/BASIN; North Pacific/PLATEAU; North Pacific/Philippine Sea/RIDGE; North Pacific/RIDGE; North Pacific/CONT RISE; South Pacific; South Pacific/BASIN; South Pacific/CONT RISE; South Pacific/VALLEY; North Pacific; South Pacific/RIDGE; North Pacific/SLOPE; South Pacific/Tasman Sea/BASIN; South Pacific/Tasman Sea/CONT RISE; South Pacific/Coral Sea/PLATEAU; Antarctic Ocean/RIDGE; Antarctic Ocean/CONT RISE; Antarctic Ocean/PLATEAU; Antarctic Ocean/BASIN; Antarctic Ocean/Tasman Sea/CONT RISE; Antarctic Ocean/Tasman Sea; Antarctic Ocean/Tasman Sea/PLATEAU; North Pacific/Philippine Sea/BASIN; North Pacific/GAP; North Pacific/ESCARPMENT; North Pacific/ABYSSAL FLOOR; North Pacific/FAN; North Pacific/Gulf of California/CONT RISE; North Pacific/FLANK; North Pacific/GRABEN; North Pacific/TROUGH; South Pacific/Coral Sea/BANK; North Pacific Ocean; West equatorial Pacific Ocean; Coral Sea; South Pacific Ocean; Juan de Fuca Ridge, North Pacific Ocean
Temporal Coverage Begin 1969-04-15T00:00:00Z
Temporal Coverage End 1996-06-22T00:00:00Z