Citation:

epic.28294.d001

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Abstract:

The mineralogy of the lower Oligocene to Quaternary sediments of core CRP-2/2A drilled on the continental shelf of McMurdo Sound in Ross Sea, Antarctica, was examined by the X-ray diffraction method. Quartz, plagioclase feldspar and K-feldspar are the most important non-clay minerals. Pyroxene and amphibole occur in minor amounts throughout the core. The composition of the sediments points to an origin in the Transantarctic Mountains for the majority of the detrital components. There, the plutonic and metamorphic rocks of the basement, the sediments of the Beacon Supergroup and the volcanic rocks of the Ferrar Group could serve as possible source lithologies. The distribution of the detrital minerals reflects a long-term history of successive erosion and valley incision. During the deposition of the lower part of the core, the detrital minerals were probably mainly derived from the sediments of the Beacon Supergroup, as indicated by the high quartz but relatively low feldspar abundances. In the upper c. 350 m of the core, the influence of a source in the basement became stronger and results in lower quartz contents but increasing abundance of feldspar. Some diagenetic alteration of the sediments is indicated by the occurrence of zeolites below c. 320 mbsf and of opal-CT above c. 320 mbsf.

Project(s):

Cape Roberts Project (CRP)

Coverage:

Latitude: -77.005980 * Longitude: 163.719450

Date/Time Start: 1998-10-16T07:30:00 * Date/Time End: 1998-11-25T14:20:00

Minimum DEPTH, sediment/rock: 7.11 m * Maximum DEPTH, sediment/rock: 623.81 m

Event(s):

CRP-2A (14.2 km at 096° true from Cape Roberts) * Latitude: -77.005980 * Longitude: 163.719450 * Date/Time Start: 1998-10-16T07:30:00 * Date/Time End: 1998-11-25T14:20:00 * Elevation: -177.9 m * Recovery: 624 m * Location: off Cape Roberts, Ross Sea, Antarctica * Campaign: * Basis: Sampling/drilling from ice * Method/Device: Core wireline system (CWS) * Comment: 921 m at 284° from CRP-1. Sea-ice thickness: 2.0 m (1 Oct) to 2.2 m (23 Nov). Sea riser embedded to 13.03 mbsf. Lateral ice movement: 9.87 m to east from 17 Oct to 23 Nov. HQ core to 199.31 mbsf. NQ core to 624.15 mbsf. 13.03 to 45.97 mbsf, 11.29 m (34%) partially following CRP-2. 45.07 to 624.15 mbsf, 548.67 m (95%) new hole. Deepest core-lithology: hard sandy siltstone. Deepest core-age: earliest Oligocene (ca. 33 Ma on diatoms, nannofossils and dinoflagellates)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m			Geocode
2	Sand	Sand	%	Ehrmann, Werner	Grain size, sieving/settling tube
3	Quartz/standard ratio	Qz/std		Ehrmann, Werner	X-ray diffraction (XRD)	intensity ratio, quartz at 4.26Å
4	Feldspar/standard ratio	Fsp/std		Ehrmann, Werner	X-ray diffraction (XRD)	ratio peak area/double left peak area
5	Feldspar 3.24 Å (Kalifeldspar)/standard ratio	Kfs 3.24 Å/std		Ehrmann, Werner	X-ray diffraction (XRD)	intensity ratio
6	Feldspar 3.18 Å (Plagioclase)/standard ratio	Pl 3.18 Å/std		Ehrmann, Werner	X-ray diffraction (XRD)	intensity ratio
7	Kalifeldspar/Plagioclase ratio	Kfs/Pl		Ehrmann, Werner	X-ray diffraction (XRD)	intensity ratio
8	Quartz/Feldspar ratio	Qz/Fsp		Ehrmann, Werner	X-ray diffraction (XRD)	peak area ratio, quartz at 4.26Å
9	Pyroxene/standard ratio	Pyrox/std		Ehrmann, Werner	X-ray diffraction (XRD)	ratio peak area/double left peak area
10	Amphibole/standard ratio	Amp/std		Ehrmann, Werner	X-ray diffraction (XRD)	ratio peak area/double left peak area
11	Zeolite/standard ratio	Zeo/std		Ehrmann, Werner	X-ray diffraction (XRD)	intensity ratio
12	Opal-CT/standard ratio	Opal-CT/std		Ehrmann, Werner	X-ray diffraction (XRD)	intensity ratio

License:

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

Size:

797 data points

Data

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

1 Depth sed [m]	2 Sand [%]	3 Qz/std	4 Fsp/std	5 Kfs 3.24 Å/std	6 Pl 3.18 Å/std	7 Kfs/Pl	8 Qz/Fsp	9 Pyrox/std	10 Amp/std	11 Zeo/std	12 Opal-CT/std
7.11	46.9	2.48	3.14	0.96	1.24	0.77	0.65	1.66	0.087	0.000	0.050
16.97	18.7	1.19	2.83	0.97	1.03	0.94	0.34	1.63	0.029	0.000	0.057
23.55	41.8	1.01	3.75	2.46	2.52	0.98	0.23	1.94	0.030	0.000	0.102
30.71	14.4	0.74	3.86	0.91			0.14	1.63	0.043	0.000	0.147
40.48	54.0	1.71	3.44	1.07	1.77	0.60	0.39	1.36	0.008	0.000	0.028
50.36	39.3	1.18	4.08	1.38			0.24	1.87	0.020	0.023	0.032
61.48	2.4	0.73	3.76	1.37	1.53	0.90	0.17	1.82	0.082	0.000	0.079
68.24	2.6	0.64	3.49	1.06	1.52	0.69	0.17	1.56	0.048	0.000	0.063
74.50	37.3	0.80	4.28	1.54	1.86	0.83	0.18	1.96	0.019	0.000	0.060
85.22	59.1	1.22	3.48	1.11			0.30	1.80	0.084	0.011	0.000
94.22	45.8	1.30	4.72	1.98			0.21	1.87	0.015	0.000	0.079
99.22	45.7	1.08	4.95	1.32	2.88	0.46	0.20	2.24	0.013	0.000	0.045
108.84	48.3	1.00	4.20	1.26			0.19	1.82	0.028	0.000	0.075
115.63	28.4	0.89	4.89	1.66	1.89	0.88	0.15	1.89	0.039	0.000	0.135
123.72	3.2	1.00	2.86	0.82	1.40	0.58	0.30	0.99	0.018	0.000	0.019
135.24	26.6	1.13	5.03	1.43	1.85	0.77	0.20	2.44	0.026	0.000	0.064
143.39	41.7	1.51	3.82	0.93	2.11	0.44	0.33	1.48	0.083	0.000	0.047
151.52	83.1	2.70	3.76	1.04	2.22	0.47	0.50	1.73	0.005	0.000	0.000
160.53	2.0	0.96	3.31	1.14	1.44	0.79	0.25	1.56	0.052	0.000	0.023
171.70	5.5	0.89	3.58	1.21	1.64	0.74	0.22	2.88	0.021	0.000	0.037
180.72	5.2	2.90	3.64	1.04	2.22	0.47	0.59	1.48	0.034	0.000	0.051
187.76	78.0	0.89	3.18	1.16	1.30	0.90	0.19	1.40	0.032	0.000	0.078
197.93	36.9	1.39	3.88	1.40	1.62	0.87	0.30	1.61	0.013	0.000	0.027
204.96	35.2	1.23	3.75	1.41	1.70	0.83	0.24	1.60	0.010	0.000	0.000
214.30	24.8	1.81	5.07	1.93	2.47	0.78	0.27	1.39	0.029	0.000	0.033
222.13	38.4	1.89	3.88	1.62	1.48	1.09	0.34	1.55	0.014	0.000	0.019
231.35	22.4	1.22	3.16	0.94			0.35	1.21	0.153	0.000	0.039
239.24	32.5	1.58	3.31	1.19			0.34	1.51	0.014	0.000	0.037
247.29	37.6	1.49	4.40	1.53	2.36	0.65	0.31	1.44	0.016	0.000	0.043
250.19	15.0	1.93	3.78	1.25	1.80	0.69	0.36	1.14	0.024	0.000	0.027
254.08	8.9	1.37	2.85	0.75	1.26	0.60	0.38	0.89	0.013	0.000	0.022
264.35	33.6	1.45	2.56	0.83	1.34	0.62	0.48	1.20	0.012	0.000	0.017
271.25	30.4	1.46	3.90	1.40	1.71	0.82	0.33	1.59	0.021	0.018	0.080
282.56	94.7	3.87	3.70	1.10	2.10	0.52	0.79	1.46	0.009	0.007	0.010
286.57	97.9
295.92	23.8	1.47	4.38	1.34	3.06	0.44	0.29	1.58	0.000	0.000	0.019
300.13	52.4	1.78	3.32	0.95	1.78	0.53	0.45	1.70	0.000	0.000	0.000
305.67	48.3	1.33	3.94	1.35	2.20	0.61	0.28	1.73	0.000	0.000	0.000
309.70	15.1	1.36	3.75	1.18	1.68	0.70	0.32	1.91	0.000	0.000	0.023
319.98	1.7	1.80	3.86	1.60	2.02	0.80	0.39	1.64	0.041	0.000	0.048
329.64	3.9	1.39	3.32	1.07	1.61	0.66	0.38	1.57	0.026	0.012	0.000
338.62	7.7	1.08	3.33	1.02	1.73	0.59	0.27	1.52	0.097	0.052	0.000
345.02	5.6	1.18	3.40	1.05	2.11	0.50	0.29	1.26	0.120	0.000	0.000
353.64	57.0	2.60	3.43	1.14	1.57	0.73	0.61	1.15	0.032	0.018	0.000
362.21	59.8	3.04	3.18	0.77	1.21	0.64	0.74	1.18	0.036	0.011	0.000
370.12	63.4	2.39	2.68	0.76	1.49	0.51	0.66	1.19	0.053	0.000	0.000
375.19	65.6	3.14	5.04	1.25	4.61	0.27	0.49	1.40	0.027	0.000	0.000
381.73	66.9	3.10	2.62	1.08	1.20	0.90	0.95	1.22	0.009	0.000	0.000
390.42	29.2	1.94	3.35	0.78	1.48	0.53	0.46	1.16	0.043	0.008	0.000
397.09	57.7	2.64	2.73	0.55	1.55	0.35	0.81	1.32	0.088	0.000	0.000
407.28	65.9	2.72	2.70	1.06	0.92	1.15	0.79	1.27	0.016	0.030	0.000
414.87	51.4	3.22	2.75	0.91	1.37	0.66	0.83	1.28	0.015	0.000	0.000
424.13	47.5	2.73	2.61	0.58	1.48	0.39	0.78	1.17	0.000	0.000	0.000
433.72	96.0	2.88	2.33	0.71	0.95	0.74	1.14	1.11	0.000	0.000	0.000
442.96	33.2	2.69	3.27	1.66	1.66	1.00	0.61	1.38	0.029	0.000	0.014
451.67	24.5	1.83	2.98	1.10	1.09	1.02	0.46	0.86	0.015	0.022	0.014
459.65	12.0	1.53	2.52	0.70	1.26	0.55	0.48	1.16	0.081	0.000	0.000
469.26	26.0	1.92	3.15	0.85	1.66	0.51	0.49	1.27	0.031	0.000	0.000
476.60	40.9	2.23	4.05	1.50	2.00	0.75	0.45	1.44	0.022	0.000	0.000
483.71	52.4	1.96	3.64	0.95	1.54	0.61	0.49	1.54	0.052	0.000	0.000
487.80	71.4	2.97	2.61	1.50	0.43	3.45	1.00	1.09	0.005	0.075	0.000
493.87	64.1	2.81	1.44	0.45	0.67	0.67	1.64	0.59	0.000	0.111	0.000
506.25	14.4	2.84	2.61	0.64	1.03	0.62	0.92	1.69	0.026	0.038	0.000
517.00	73.1	2.47	3.37	0.99	0.99	1.00	0.62	1.64	0.003	0.018	0.000
529.62	89.6	2.88	1.87	0.45	1.23	0.37	1.24	0.99	0.000	0.015	0.000
538.44	35.6	2.25	4.24	1.68	2.19	0.77	0.44	1.13	0.045	0.000	0.000
548.44	90.3	3.28	2.72	1.34	1.01	1.32	1.02	2.27	0.000	0.000	0.000
558.13	28.2	2.24	4.99	2.04	1.51	1.36	0.36	1.70	0.038	0.000	0.000
569.28	76.6	3.09	2.50	0.94	0.94	1.00	0.90	1.20	0.007	0.127	0.000
577.26	72.5	3.12	2.22	0.91	0.83	1.10	0.94	2.41	0.015	0.000	0.000
588.91	67.7	3.08	2.08	0.62	1.06	0.58	1.19	0.60	0.000	0.184	0.000
598.89	79.8	3.20	2.19	1.19	0.81	1.46	1.14	1.15	0.000	0.086	0.000
609.32	33.7	2.69	2.14	0.87			1.13	1.73	0.008	0.068	0.000
620.18	26.2	2.61	2.47	0.68	0.97	0.70	0.82	0.84	0.000	0.085	0.000
623.81	29.1	2.42	1.69	0.54			1.15	0.48	0.016	0.074	0.000