Table 1. 

Description of main results

Geochemical parameterPlatform: well BB-3Basin: well ALNR-1Basin: well MM NW-7
Detrital proxies: ThDepleted relative to average carbonate; peak in ash samples, decreasing up section (Fig. 5a)Near crustal values in U shale and Thuleilat shale, depleted in silicilyte; increasing up section to Thuleilat shale (Fig. 5b and c)
Detrital proxies: TiDepleted relative to average carbonate; peak in ash samples, ± constant up section (Fig. 5a)Same as Th above (Fig. 5b and c)
Detrital proxies: ZrSame as Ti aboveSame as Th and Ti above
REE profile and ΣREEΣREE decreases up section (Fig. 6a); (1) ash: ΣREE c. half of PAAS, slight HREE enrichment (Fig. 6a); (2) group 1: ΣREE Mostly flat profiles with minor variation; silicilyte and chert samples are almost indistinct and tend towards slight HREE enrichment (Fig. 8a); ΣREE in U shale and Thuleilat shale similar to PAAS, c. one order of magnitude smaller in silicilyte (Fig. 8a)
c. two orders of magnitude < PAAS, strong HREE depletion, slight MREE enrichment (Fig. 6a); (3) group 2: ΣREE c. three orders of magnitude < PAAS, flat profileLREE enrichment in U shaleHREE enrichment most pronounced in Thuleilat shale
REE: Ce anomalyTrue positive Ce anomaly in two group 1 carbonate samples (Ce/Ce*=1.09–1.10) (Fig. 6c)True negative Ce anomalies common (Ce/Ce*=0.57–0.93), but no systematic variation with lithology or stratigraphic position (Fig. 8c); single silicilyte sample of MM NW-7 with true positive Ce anomaly (Ce/Ce*=1.23) (Fig. 8c)
Redox: MnIncreases gradually up section (Fig. 7a); Mn/Th increases sharply at base of A4C, flattens out at values above average Concentrations < PAAS, tend to be higher and more variable in the shale units than in silicilyte (Fig. 10a); no vertical trends of Mn/Th, ratio smaller than or equal to Mn/Th in PAAS (Fig. 10b); no correlation with detrital parameters (Fig. 9a)
carbonate, again increases in middle ramp (Fig. 7c); no correlation with detrital parameters (Fig. 9a) Peak at 2700–2705 m correlates with higher carbonate content
Redox: VPeak near base of A4C, dropping to ≤5 ppm up section (Fig. 7b); peak concentrations exceed average carbonate; V/Th increases sharply at base of A4C, flattens out at values above average carbonate (Fig. 7c); no correlation with detrital parameters (Fig. 9c)Silicilyte concentrations similar to or slightly > PAAS, V is strongly enriched in shale units (Fig. 10c); V/Th enriched above PAAS throughout succession (Fig. 10d); no correlation with detrital parameters, but silicilyte samples tend to be more tightly clustered (Fig. 9b)
Redox: U/ThIncreases up section (Fig. 7a), ratio above average carbonate (except ash samples)Enriched > PAAS throughout succession, peak near base of succession, two intervals of pronounced enrichment in silicilyte (Fig. 11a)Mostly below PAAS, increasing through silicilyte to prominent peak near top of unit, which is strongly enriched > PAAS
Redox: UautHighly variable, values ≤5 ppm (Fig. 7b); no correlation with detrital parameters (Fig. 9b)Enriched > PAAS throughout succession, peaks in basal U shale and in Thuleilat, increasing through upper silicilyte (Fig. 11a); no correlation with detrital parameters, but silicilyte samples tend to be more tightly clustered (Fig. 9b)
Redox: MoAbsolute values and Mo/Th similar in behaviour to V, below detection limit Mo/Th > PAAS; no correlation with detrital parameters, but silicilyte samples tend to be more tightly clustered (Fig. 9d)
above base; no correlation with detrital parameters (Fig. 9d)No vertical trends of absolute concentrations; Mo/Th strongly enriched > PAAS in lower silicilyte (Fig. 11c)High absolute concentrations in shale units, drop in silicilyte (Fig. 11b); no vertical trends of Mo/Th, few samples near top of silicilyte have Mo/Th < PAAS