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MacLeod, Kenneth G; Huber, Brian T; Fullagar, Paul D (2001): (Table 1) 87Sr/86Sr results for the Cretaceous-Tertiary boundary, ODP Hole 171-1049C [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.712627, Supplement to: MacLeod, KG et al. (2001): Evidence for a small (~0.000030) but resolvable increase in seawater 87Sr/86Sr ratios across the Cretaceous-Tertiary boundary. Geology, 29(4), 303-306, https://doi.org/10.1130/0091-7613(2001)029%3C0303:EFASBR%3E2.0.CO;2

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Abstract:
Previous studies of 87Sr/86Sr patterns across the Cretaceous-Tertiary (K-T) boundary have generated inconsistent results. Analyses of samples from Ocean Drilling Program Hole 1049C provide better taphonomic and diagenetic control than has been previously achieved and indicate (1) that there was a rapid increase of ~0.000030 in seawater 87Sr/ 86Sr ratios across the K-T boundary, (2) that post K-T Cretaceous foraminifera at this site are reworked, and (3) that subtle diagenetic overprinting affects the basal ~15 cm of the Danian ooze. These conclusions are consistent with the asteroid impact hypothesis. Reworking rather than survivorship confirms nearly complete extinction of Cretaceous Tethyan planktic foraminifera; the 87Sr/86Sr excursion can be explained by enhanced continental weathering, perhaps related to acid rain in the aftermath of the K-T impact.
Project(s):
Coverage:
Latitude: 30.142270 * Longitude: -76.112110
Date/Time Start: 1997-01-16T00:30:00 * Date/Time End: 1997-01-16T00:30:00
Minimum DEPTH, sediment/rock: 112.20 m * Maximum DEPTH, sediment/rock: 115.30 m
Event(s):
171-1049C * Latitude: 30.142270 * Longitude: -76.112110 * Date/Time: 1997-01-16T00:30:00 * Elevation: -2670.8 m * Penetration: 158.5 m * Recovery: 88.86 m * Location: Blake Nose, North Atlantic Ocean * Campaign: Leg171B * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 13 cores; 111.5 m cored; 47 m drilled; 79.7 % recovery
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
DEPTH, sediment/rockDepth sedmGeocode
Sample code/labelSample labelMacLeod, Kenneth GDSDP/ODP/IODP sample designation
Sample commentSample commentMacLeod, Kenneth G
Sample typeSamp typeMacLeod, Kenneth G
Strontium-87/Strontium-86 ratio87Sr/86SrMacLeod, Kenneth GMass spectrometer VG Sector 54
Strontium-87/Strontium-86 ratio, error87Sr/86Sr e±MacLeod, Kenneth GCalculated
Size:
155 data points

Data

Download dataset as tab-delimited text — use the following character encoding:


Depth sed [m]

Sample label

Sample comment

Samp type

87Sr/86Sr

87Sr/86Sr e [±]
112.20171-1049C-8X-5,10-12Danian, gray intervalforaminifera that first appear in the Cretaceous0.7078560.0007
112.20171-1049C-8X-5,10-12Danian, gray intervalforaminifera that first appear in the Tertiary0.7078740.0006
112.50171-1049C-8X-5,40-41Danian, gray intervalforaminifera that first appear in the Cretaceous0.7078560.0007
112.50171-1049C-8X-5,40-41Danian, gray intervalforaminifera that first appear in the Tertiary0.7078890.0007
112.60171-1049C-8X-5,50-52Danian, gray intervalforaminifera that first appear in the Cretaceous0.7078400.0007
112.60171-1049C-8X-5,50-52Danian, gray intervalforaminifera that first appear in the Tertiary0.7078760.0007
112.71171-1049C-8X-5,60-62Danian, gray intervalforaminifera that first appear in the Cretaceous0.7078860.0007
112.71171-1049C-8X-5,61-62Danian, gray intervalforaminifera that first appear in the Cretaceous0.7078540.0007
112.71171-1049C-8X-5,61-62Danian, gray intervalforaminifera that first appear in the Tertiary0.7078970.0005
112.82171-1049C-8X-5,72-72.5Danian, gray intervalforaminifera that first appear in the Cretaceous0.7078690.0007
112.82171-1049C-8X-5,72-72.5Danian, gray intervalforaminifera that first appear in the Tertiary0.7078820.0010
112.85171-1049C-8X-5,75-75.5Danian, white or mottled intervalforaminifera that first appear in the Cretaceous0.7078480.0008
112.85171-1049C-8X-5,75-75.5Danian, white or mottled intervalforaminifera that first appear in the Tertiary0.7078170.0007
112.90171-1049C-8X-5,80-80.5Danian, white or mottled intervaldolomite rhombs0.7078200.0012
112.90171-1049C-8X-5,80-80.5Danian, white or mottled intervalforaminifera that first appear in the Cretaceous0.7078630.0006
112.90171-1049C-8X-5,80-80.5Danian, white or mottled intervalforaminifera that first appear in the Tertiary0.7078920.0011
112.90171-1049C-8X-5,80-80.5Danian, white or mottled intervalforaminifera that first appear in the Tertiary0.7078510.0005
112.92171-1049C-8X-5,81.5-82Danian, white or mottled intervalforaminifera that first appear in the Cretaceous0.7078550.0007
112.92171-1049C-8X-5,81.5-82Danian, white or mottled intervalforaminifera that first appear in the Tertiary0.7077980.0007
112.97171-1049C-8X-5,87-87.5Danian, white or mottled intervalforaminifera that first appear in the Cretaceous0.7078540.0007
113.04171-1049C-8X-5,93.5-94Danian, spherulitic clayacetic acid leach of bulk sediment (assumed to represent bulk carbonate)0.7078790.0008
113.04171-1049C-8X-5,93.5-94Danian, spherulitic clayacetic acid leach of bulk sediment (assumed to represent bulk carbonate)0.7079050.0006
113.04171-1049C-8X-5,93.5-94Danian, spherulitic claymaterial insoluble in acetic but soluble in HF (assumed to represent bulk silicate)0.7089580.0008
113.05171-1049C-8X-5,95-95.5Danian, spherulitic clayacetic acid leach of bulk sediment (assumed to represent bulk carbonate)0.7080850.0007
113.05171-1049C-8X-5,95-95.5Danian, spherulitic clayacetic acid leach of bulk sediment (assumed to represent bulk carbonate)0.7080580.0013
113.05171-1049C-8X-5,95-95.5Danian, spherulitic claymaterial insoluble in acetic but soluble in HF (assumed to represent bulk silicate)0.7091600.0007
113.15171-1049C-8X-5,105-106Maastrichtian, oozeforaminifera that first appear in the Cretaceous0.7078480.0006
113.45171-1049C-8X-5,135-137Maastrichtian, oozeforaminifera that first appear in the Cretaceous0.7078510.0008
114.05171-1049C-8X-6,45-47Maastrichtian, oozeforaminifera that first appear in the Cretaceous0.7078640.0006
114.85171-1049C-8X-6,125-127Maastrichtian, oozeforaminifera that first appear in the Cretaceous0.7078490.0006
115.30171-1049C-8X-7,20-22Maastrichtian, oozeforaminifera that first appear in the Cretaceous0.7078750.0007