Publication Date:
2024-06-26
Description:
Radiocarbon ages on CaCO3 from deep-sea cores offer constraints on the nature of the CaCO3 dissolution process. The idea is that the toll taken by dissolution on grains within the core top bioturbation zone should be in proportion to their time of residence in this zone. If so, dissolution would shift the mass distribution in favor of younger grains, thereby reducing the mean radiocarbon age for the grain ensemble. We have searched in vain for evidence supporting the existence of such an age reduction. Instead, we find that for water depths of more than 4 km in the tropical Pacific the radiocarbon age increases with the extent of dissolution. We can find no satisfactory steady state explanation and are forced to conclude that this increase must be the result of chemical erosion. The idea is that during the Holocene the rate of dissolution of CaCO3 has exceeded the rain rate of CaCO3. In this circumstance, bioturbation exhumes CaCO3 from the underlying glacial sediment and mixes it with CaCO3 raining from the sea surface.
Keywords:
A150/180; A180-74; Age, 14C conventional; Age, dated; also published as VM28-122; Amerasian Basin; ARK-III/3; Atlantic Ocean; BC; Box corer; Calculated; CEPAG; CH182-36; CH73-013; CH7X; DEPTH, sediment/rock; Eastern Equatorial Pacific; Elevation of event; EN06601; EN066-21GGC; EN066-24PG; EN066-29GGC; EN066-32GGC; EN066-34PG; EN066-39GGC; EN066-45PG; EN066-47PG; EN066-51PG; Endeavor; ERDC; ERDC-077BX; ERDC-079BX; ERDC-083BX; ERDC-092BX; ERDC-108BX; ERDC-112BX; ERDC-120BX; ERDC-123BX; ERDC-125BX; ERDC-128BX; ERDC-129BX; ERDC-131BX; ERDC-135BX; ERDC-136BX; ERDC-139BX; ERDC-141BX; Event label; FA-527-3; FL-124; Fram Strait; GC; Giant box corer; GIK21295-4 PS07/586; GKG; Gravity corer; INMD; INMD-097BX; INMD-101BX; INMD-104BX; INMD-109BX; INMD-110BX; INMD-111BX; INMD-113BX; INMD-115BX; Jean Charcot; Lamont-Doherty Earth Observatory, Columbia University; Latitude of event; LDEO; Le Suroît; Longitude of event; Melville; North Atlantic; PC; Piston corer; PLDS-066BX; PLDS-068BX; PLDS-070BX; PLDS-072BX; PLDS-074BX; PLDS-077BX; PLDS-079BX; PLDS-081BX; PLDS-083BX; PLDS-085BX; PLDS-089BX; PLDS-090BX; PLDS-092BX; PLDS-107BX; PLDS-3; Pleiades; Polarstern; PS07; PS1295-4; Quaternary Environment of the Eurasian North; QUEEN; RC13; RC13-189; RC24; RC24-1; RC24-7; Reference/source; Robert Conrad; Sampling/drilling ice; Sedimentation rate; SU81-14; SU81-18; T-3; Thomas G. Thompson (1964); Thomas Washington; TR163-31; TT154-10; TT154-5; TTXXX; V19; V19-188; V23; V23-81; V25; V25-56; V28; V28-122; V28-238; V30; V30-40; V30-41; V30-51; V32; V32-8; V33/4-14; V33-88; V35; V35-5; Vema
Type:
Dataset
Format:
text/tab-separated-values, 219 data points
