Citation:

epic.28348.d001

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Abstract:

Clay mineral assemblages in lower Miocene and Quaternary sediments recovered at the CRP-1 drillsite, McMurdo Sound shelf, Antarctica, were analysed in order to reconstruct source areas of the sediments and late Cenozoic Antarctic icedynamics. The assemblages are dominated by smectite, illite and chlorite. Kaolinite occurs in trace amounts only. The lower part of the drillcore, below c. 70 mbsf, is characterised by high illite and chlorite, but low smectite concentrations. This assemblage is typical of a source consisting mainly of granitic and metamorphic rocks, such as are widespread in the Transantarctic Mountains and on the East Antarctic craton. In contrast, the upper c. 70 mbsf of the core is characterised by three intervals with high smectite, but low illite and chlorite concentrations at around 59, 45 and 33 mbsf. The smectite-rich assemblage is typical of a hinterland composed of volcanic rocks, such as are found in the region of the present-day Ross Ice Shelf. The clay minerals are mainly detrital and therefore document the changing influence of different source areas through time. Correlation of the clay mineral record of CRP-1 with that of the CIROS-1 and MSSTS-1 cores implies that the oldest sediments at CRP-1 are younger than 21.8 Ma, and that there is no overlap between CRP-l and the other cores.

Project(s):

Cape Roberts Project (CRP)

Coverage:

Latitude: -77.007580 * Longitude: 163.755080

Date/Time Start: 1997-10-17T01:30:00 * Date/Time End: 1997-10-24T02:00:00

Minimum DEPTH, sediment/rock: 19.43 m * Maximum DEPTH, sediment/rock: 147.01 m

Event(s):

CRP-1 (16 km ENE Cape Roberts) * Latitude: -77.007580 * Longitude: 163.755080 * Date/Time Start: 1997-10-17T01:30:00 * Date/Time End: 1997-10-24T02:00:00 * Elevation: -153.5 m * Penetration: 132.06 m * Recovery: 113.32 m * Location: off Cape Roberts, Ross Sea, Antarctica * Campaign: * Basis: Sampling/drilling ice * Method/Device: Core wireline system (CWS) * Comment: sea ice thickness: 1.60 m, recovery 86 %. Age and lithology of oldest strata: 22-24 Ma; mudstone with scattered pebbles.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m			Geocode
2	Size fraction < 0.002 mm, clay	<2 µm	%	Ehrmann, Werner	Grain size, sieving/settling tube
3	Smectite	Sme	%	Ehrmann, Werner	X-ray diffraction TEXTUR, clay fraction
4	Illite	Ill	%	Ehrmann, Werner	X-ray diffraction TEXTUR, clay fraction
5	Chlorite	Chl	%	Ehrmann, Werner	X-ray diffraction TEXTUR, clay fraction
6	Kaolinite	Kln	%	Ehrmann, Werner	X-ray diffraction TEXTUR, clay fraction
7	Smectite, integral width	Smec IW	d2Theta	Ehrmann, Werner	X-ray diffraction TEXTUR, clay fraction
8	Illite, integral width	Ill IW	d2Theta	Ehrmann, Werner	X-ray diffraction TEXTUR, clay fraction
9	Illite 5Å/10Å Esquevin-index	Ill EI		Ehrmann, Werner	X-ray diffraction TEXTUR, clay fraction
10	Illite position 10Å	Ill 10Å	Å	Ehrmann, Werner	X-ray diffraction TEXTUR, clay fraction

License:

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

Size:

630 data points

Data

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

1 Depth sed [m]	2 <2 µm [%]	3 Sme [%]	4 Ill [%]	5 Chl [%]	6 Kln [%]	7 Smec IW [d2Theta]	8 Ill IW [d2Theta]	9 Ill EI	10 Ill 10Å [Å]
19.43	1.14	24	47	26	3.5	2.26	0.55	0.495	9.99
20.64	1.29	26	42	31	1.4	1.69	0.59	0.786	10.01
21.50	4.98
24.85	1.56	29	31	38	2.6	1.64	0.57	1.248	10.09
25.81	1.16
26.81	1.55	38	40	20	1.4	2.30	0.56	0.264	10.01
27.67	2.54
30.37	1.68	46	30	22	1.8	2.23	0.51	0.505	10.07
32.23	3.39	50	38	12	1.0		0.50	0.248	10.03
32.54	12.92	57	34	10	0.0	1.90	0.57	0.405	9.99
34.17	6.56	59	28	12	1.2	2.58	0.52	0.228	10.01
35.54	5.10	24	49	25	2.2	1.97	0.58	0.303	10.05
38.48	4.38	40	36	20	4.1	2.41	0.63	0.239	10.00
40.40	4.99	37	38	23	2.5	2.36	0.49	0.230	10.01
42.53	4.58	41	39	20	0.0	2.22	0.65	0.292	10.03
44.48	2.35	92	4	3	0.6	2.05	0.31	0.474	9.99
45.61	3.68	77	16	7	0.5	2.10	0.51	0.232	10.03
46.41	3.47	73	18	9	0.6	2.10	0.51	0.202	9.97
47.59	3.98	57	31	11	0.5	2.13	0.61	0.259	10.01
48.95	5.36	45	42	11	2.3	2.35	0.58	0.176	10.01
49.89	5.00
51.78	4.84	40	45	12	2.3	2.48	0.55	0.263	10.01
53.10	6.13	33	54	13	0.4	2.12	0.64	0.196	10.05
54.11	13.58
54.87	10.29
56.11	2.72	25	56	18	1.1	2.25	0.54	0.220	10.07
56.85	7.75
58.10	8.48	40	43	17	0.0	2.40	0.60	0.167	10.01
58.97	1.68	66	21	12	0.9	2.33	0.50	0.186	10.03
59.63	1.47	63	26	10	1.6	2.41	0.52	0.226	10.05
59.92	10.02	35	47	16	2.5	2.04	0.63	0.153	10.05
60.89	0.01
62.70	1.11	46	35	15	3.4	2.52	0.49	0.352	10.01
63.25	0.47	32	36	32	0.9	1.97	0.54	0.299	10.09
66.09	1.89	23	53	21	3.3	2.17	0.49	0.248	10.01
66.59	8.17
67.35	15.97
68.45	2.27	23	54	22	1.5	2.32	0.56	0.282	9.99
69.76	26.13
70.68	3.07	25	53	20	2.1	2.42	0.51	0.284	10.01
72.65	0.42
75.07	18.92
75.74	9.64	16	66	17	1.1	1.93	0.59	0.163	10.07
76.43	15.98
77.72	12.03
79.04	5.28	18	60	20	2.8	1.89	0.68	0.106	10.09
79.65	6.69
80.38	5.81	12	66	20	2.4	1.45	0.61	0.100	10.05
81.64	9.21
83.47	9.13	15	65	19	1.1	1.84	0.59	0.126	10.07
84.40	11.25
85.50	16.62	22	57	20	0.9	2.08	0.60	0.125	10.07
86.33	6.44
87.55	11.42	18	64	18	0.0	2.23	0.60	0.126	10.07
89.00	0.46
90.40	0.13
91.24	1.33	13	54	29	3.7		0.41	0.204	10.05
92.40	11.93	13	64	23	0.8	2.25	0.58	0.155	10.07
93.49	15.98
94.65	6.09	10	67	21	1.8	1.63	0.59	0.112	10.07
95.46	15.09
96.57	9.64	17	60	21	2.3	1.78	0.58	0.117	10.05
97.42	9.29
98.37	14.83	14	65	21	0.4	1.95	0.63	0.140	10.09
99.39	18.82
100.29	14.80	15	66	17	1.6	2.12	0.62	0.121	10.09
101.56	17.25
102.58	4.81	21	60	19	0.3	1.80	0.59	0.226	10.03
103.49	2.50
104.36	1.48	26	51	21	2.7	2.31	0.64	0.136	10.03
105.76	3.11
106.68	2.92	27	49	23	0.1	1.93	0.57	0.109	10.05
107.69	3.45
108.67	3.96	22	55	21	1.9	2.45	0.67	0.209	10.07
109.51	2.38
110.80	12.15	22	58	17	3.0	1.92	0.58	0.196	10.05
111.72	7.30	28	53	17	1.4	2.16	0.60	0.175	10.03
112.66	4.53
113.67	6.93	34	50	15	1.1	2.13	0.66	0.135	10.03
114.88	0.36
115.69	7.81	27	54	17	1.5	2.00	0.61	0.218	10.01
116.71	0.26
117.88	0.61	24	54	20	2.7	2.10	0.54	0.237	10.03
118.55	3.88
119.91	5.43
120.86	10.92	22	57	20	1.4	2.03	0.57	0.128	10.07
121.84	2.01	27	53	19	1.1	1.80	0.52	0.151	10.05
122.80	6.07	31	50	19	0.4	2.46	0.58	0.158	10.07
123.91	6.03
124.68	4.71
125.70	2.74	24	58	17	1.0	1.90	0.59	0.212	10.07
126.67	5.12
127.65	9.21	27	55	16	2.5	2.17	0.55	0.118	10.07
128.55	9.16
129.60	5.58
130.65	7.09	22	55	20	2.4	2.07	0.60	0.160	10.07
131.66	7.26	19	56	23	1.5	1.58	0.60	0.109	10.07
132.45	7.78
133.47	9.97	17	58	22	3.3	1.88	0.65	0.182	10.07
134.67	6.04
135.77	7.73	18	52	27	2.0	1.95	0.60	0.181	10.05
136.85	1.96
137.73	5.21	25	52	20	2.0	1.94	0.62	0.121	10.07
138.68	6.55
139.76	4.39	22	54	23	1.2	1.99	0.59	0.088	10.07
141.04	8.16
142.33	22.42	24	57	17	2.2	2.31	0.64	0.138	10.07
142.50	24.60
143.52	22.08
145.38	16.01	25	54	18	2.6	2.21	0.55	0.196	10.07
146.51	19.70	26	54	19	0.7	2.05	0.62	0.179	10.07
147.01	20.41	24	60	16	0.0	2.07	0.58	0.145	10.07