Citation:

odp.proc.sr.121.177.1991

Name: Abunance of Iridium and other elements from ODP Hole 121-752B (Table 1)
Published: 1991
License: https://creativecommons.org/licenses/by/3.0/

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Published: 1991 (exact date unknown) • DOI registered: 2011-05-05

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Abstract:

Following neutron activation, a study was made with the Iridium Coincidence Spectrometer (ICS) of the abundance profile of iridium in the Cretaceous-Tertiary boundary region of cores from Hole 752B taken from the Indian Ocean west of Australia. The ICS was modified to measure 13 other elements simultaneously with the Ir determination, and data are included for Co, Cr, Cs, Fe, Hf, and Se. The K-T region was sampled continuously in 1 cm increments from 8 cm below to 22 cm above the boundary, and an additional 30 spot samples were taken in the region from 10 m below to 6.7 m above.

A large Ir anomaly of 3800 parts per trillion (ppt) over a background of 22 ppt was found in interval 121-752B-11R-3, 91-93 cm. This interval overlaps the extinction level of globotruncanids determined by the Shipboard Scientific Party. After correcting for the estimated clay content, no Ir over the background was found in the region from 22 cm to 10 m below the main Ir peak. Iridium above background levels, however, was observed in all of the remaining samples up to 1 m above the main Ir peak. Between 2 and 5.7 m above the main Ir peak, the Ir level averaged 59 ppt and is attributed to basaltic volcanism. Another large Ir anomaly of 1500 ppt was found in a spot sample from interval 121-752B-11R-3, 13-14 cm, and its tails extend from at least 10 cm below to at least 20 cm above the anomaly. The stratigraphic extent of this second anomaly parallels that of reworked Cretaceous nannofossils determined by the Shipboard Scientific Party, and the anomaly is attributed to reworking of K-T boundary Ir from another location.

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Latitude: -30.891000 * Longitude: 93.577500

Date/Time Start: 1988-05-18T09:00:00 * Date/Time End: 1988-05-22T12:30:00

Minimum DEPTH, sediment/rock: 352.03 m * Maximum DEPTH, sediment/rock: 367.12 m

Event(s):

121-752B * Latitude: -30.891000 * Longitude: 93.577500 * Date/Time Start: 1988-05-18T09:00:00 * Date/Time End: 1988-05-22T12:30:00 * Elevation: -1097.0 m * Penetration: 435.6 m * Recovery: 112.34 m * Location: South Indian Ridge, South Indian Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 17 cores; 158 m cored; 0 m drilled; 71.1 % recovery

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Sample code/label	Sample label		Michel, Helen V	DSDP/ODP/IODP sample designation
2	DEPTH, sediment/rock	Depth sed	m			Geocode
3	Iridium	Ir	ng/kg	Michel, Helen V
4	Iridium, standard deviation	Ir std dev	±	Michel, Helen V		+ err
5	Iridium, standard deviation	Ir std dev	±	Michel, Helen V		- err
6	Cobalt	Co	mg/kg	Michel, Helen V
7	Iron	Fe	%	Michel, Helen V
8	Caesium	Cs	mg/kg	Michel, Helen V
9	Hafnium	Hf	mg/kg	Michel, Helen V
10	Chromium	Cr	mg/kg	Michel, Helen V
11	Selenium	Se	mg/kg	Michel, Helen V
12	Tantalum	Ta	mg/kg	Michel, Helen V

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

660 data points

Data

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

1 Sample label	2 Depth sed [m]	3 Ir [ng/kg]	4 Ir std dev [±] (+ err)	5 Ir std dev [±] (- err)	6 Co [mg/kg]	7 Fe [%]	8 Cs [mg/kg]	9 Hf [mg/kg]	10 Cr [mg/kg]	11 Se [mg/kg]	12 Ta [mg/kg]
121-752B-10R-5,93-94	352.03	14	10	8	3.01	0.826	0.193	0.70	4.6	58	0.128
121-752B-10R-6,43-44	353.03	68	10	10	19.39	4.335	0.403	1.62	56.0	247	0.244
121-752B-11R-1,93-94	355.73	44	21	21	30.18	7.606	0.311	3.09	24.7	809	0.464
121-752B-11R-2,44-45	356.74	65	10	10	16.61	4.403	0.592	2.05	26.0	304	0.361
121-752B-11R-2,143-144	357.73	320	37	37	11.03	2.814	0.339	3.34	28.5	316	0.876
121-752B-11R-3,3-4	357.83	151	19	19	5.42	1.370	0.164	1.65	14.2	157	0.428
121-752B-11R-3,13-14	357.93	1487	97	97	29.14	7.003	0.663	2.70	48.6	406	0.559
121-752B-11R-3,22-23	358.02	257	19	19	22.28	6.163	0.331	2.91	41.9	475	0.713
121-752B-11R-3,33-34	358.13	110	20	20	8.54	2.699	0.390	3.32	16.7	281	0.956
121-752B-11R-3,41-42	358.21	41	7	7	4.11	0.967	0.115	3.19	3.8	141	1.135
121-752B-11R-3,47-48	358.27	51	8	8	4.03	0.643	0.109	0.74	6.0	157	0.204
121-752B-11R-3,54-55	358.34	116	21	21	4.93	1.574	0.192	0.88	13.8	547	0.188
121-752B-11R-3,58-59	358.38	79	12	12	4.55	1.292	0.139	0.77	14.8	514	0.130
121-752B-11R-3,64-65	358.44	131	23	23	19.71	4.869	0.283	1.65	21.3	746	0.267
121-752B-11R-3,68-69	358.48	194	37	37	18.93	3.866	0.220	1.76	42.2	1872	0.348
121-752B-11R-3,69-70	358.49	249	42	42	17.16	3.946	0.244	1.67	41.0	1812	0.324
121-752B-11R-3,70-71	358.50	189	41	41	17.37	3.349	0.214	1.79	45.4	2047	0.361
121-752B-11R-3,71-72	358.51	355	60	60	43.25	3.014	0.220	1.97	44.2	9136	0.396
121-752B-11R-3,72-73	358.52	308	42	42	18.72	1.659	0.166	1.25	30.5	1724	0.265
121-752B-11R-3,73-74	358.53	436	54	54	54.06	2.191	0.234	1.55	46.6	3563	0.281
121-752B-11R-3,74-75	358.54	126	20	20	6.32	0.400	0.079	0.28	5.5	697	0.054
121-752B-11R-3,75-76	358.55	191	27	27	8.51	0.602	0.119	0.43	11.0	1341	0.064
121-752B-11R-3,76-77	358.56	123	17	17	4.26	0.232	0.050	0.19	3.7	690	0.038
121-752B-11R-3,77-78	358.57	84	14	14	2.51	0.162	0.046	0.17	3.4	335	0.033
121-752B-11R-3,78-79	358.58	69	12	12	1.85	0.147	0.049	0.17	2.7	273	0.030
121-752B-11R-3,79-80	358.59	105	15	15	3.15	0.150	0.053	0.18	3.5	395	0.036
121-752B-11R-3,80-81	358.60	392	22	22	7.09	0.323	0.113	0.32	6.5	799	0.080
121-752B-11R-3,81-82	358.61	320	27	27	2.74	0.208	0.073	0.26	4.5	460	0.061
121-752B-11R-3,82-83	358.62	587	41	41	8.65	0.451	0.152	0.49	9.1	714	0.120
121-752B-11R-3,83-84	358.63	599	40	40	8.20	0.405	0.134	0.47	8.2	693	0.115
121-752B-11R-3,84-85	358.64	581	41	41	11.28	0.435	0.148	0.46	8.3	813	0.122
121-752B-11R-3,85-86	358.65	290	42	42	5.97	0.251	0.071	0.25	3.7	500	0.056
121-752B-11R-3,86-87	358.66	502	26	26	4.92	0.462	0.117	0.42	6.9	536	0.107
121-752B-11R-3,87-88	358.67	757	70	70	9.38	0.741	0.202	0.73	12.5	770	0.190
121-752B-11R-3,88-89	358.68	952	96	96	16.32	1.121	0.207	1.01	16.4	913	0.239
121-752B-11R-3,89-90	358.69	1926	211	211	31.06	2.563	0.307	1.88	28.0	1394	0.405
121-752B-11R-3,90-91	358.70	2785	174	174	53.30	4.695	0.505	3.07	43.8	1833	0.795
121-752B-11R-3,91-92	358.71	3813	118	118	59.03	3.998	0.446	3.13	44.6	2398	0.816
121-752B-11R-3,92-93	358.72	3754	278	278	48.19	1.977	0.462	2.10	39.9	2203	0.527
121-752B-11R-3,93-94	358.73	1398	137	137	13.59	1.158	0.340	1.03	16.2	775	0.266
121-752B-11R-3,94-95	358.74	1220	125	125	14.13	1.077	0.282	1.08	15.2	1164	0.240
121-752B-11R-3,95-96	358.75	89	21	18	2.59	0.632	0.263	0.45	5.2	122	0.084
121-752B-11R-3,96-97	358.76	154	25	25	3.85	1.118	0.360	0.66	6.5	345	0.116
121-752B-11R-3,97-98	358.77	143	24	24	3.03	0.907	0.305	0.56	6.2	216	0.090
121-752B-11R-3,98-99	358.78	106	10	10	2.91	1.096	0.333	0.56	5.9	127	0.105
121-752B-11R-3,99-100	358.79	98	12	12	2.19	0.633	0.241	0.43	4.9	95	0.085
121-752B-11R-3,104-105	358.84	862	41	41	11.25	0.706	0.296	0.96	13.7	1859	0.243
121-752B-11R-3,109-110	358.89	35	7	7	2.43	0.504	0.239	0.44	4.9	272	0.088
121-752B-11R-3,114-115	358.94	19	7	6	2.74	0.662	0.257	0.54	7.4	134	0.107
121-752B-11R-3,119-120	358.99	12	3	3	2.09	0.437	0.235	0.47	4.8	114	0.092
121-752B-11R-3,124-125	359.04	23	8	6	3.19	0.386	0.215	0.50	5.3	177	0.100
121-752B-11R-3,134-135	359.14	18	8	6	2.58	0.371	0.221	0.49	5.1	199	0.096
121-752B-11R-3,144-145	359.24	12	8	6	4.72	0.392	0.211	0.44	4.1	143	0.086
121-752B-11R-4,4-5	359.34	10	8	6	1.77	0.500	0.256	0.58	5.4	78	0.117
121-752B-11R-4,14-15	359.44	18	11	8	2.30	0.501	0.262	0.58	5.6	134	0.109
121-752B-11R-4,25-26	359.55	33	14	11	5.03	0.790	0.256	0.88	5.5	256	0.155
121-752B-12R-1,24-25	364.64	21	21	16	13.75	3.709	0.329	1.93	53.6	163	0.454
121-752B-12R-1,111-112	365.51	28	13	10	4.53	1.371	0.295	0.99	10.7	159	0.222
121-752B-12R-2,23-24	366.13	52	23	18	10.17	3.014	0.324	0.97	27.4	353	0.148
121-752B-12R-2,122-123	367.12	12	11	8	5.03	0.764	0.248	0.88	13.0	286	0.236