Citation:

epic.26796.d001

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Abstract:

Electron microprobe (EMP) dating on monazite in granulite- facies rocks from Forefinger Point, East Antarctica, yielded dominant ages of 500 Ma on matrix monazites.They are associated with secondary cordierite, biotite and sapphirine, formed during nearly isothermal decompression after the high P-T assemblages involving garnet, orthopyroxene and sillimanite. Older ages around 750-1000 Ma are detected in monazite cores and in monazite inclusions in garnet porphyroblast. Combining the available age data and the reaction textures, it becomes evident that the Forefinger Point granulites have been overprinted by a granulite-facies decompressional event of Pan-African age. Moreover, EMP monazite dating imply that the Forefinger Point granulites have experienced at least two stages of metamorphic evolution.

Coverage:

Latitude: -67.500000 * Longitude: 48.000000

Minimum ORDINAL NUMBER: 1 * Maximum ORDINAL NUMBER: 101

Event(s):

Forefinger_Point * Latitude: -67.500000 * Longitude: 48.000000 * Location: Casey Bay, East Antarctica * Method/Device: Outcrop sample (OUTCROP)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	ORDINAL NUMBER	Ord No				Geocode
2	Sample code/label	Sample label		Motoyoshi, Yoichi
3	Uranium dioxide	UO2	%	Motoyoshi, Yoichi	Electron microprobe (EMP)
4	Thorium oxide	ThO2	%	Motoyoshi, Yoichi	Electron microprobe (EMP)
5	Thorium oxide	ThO2	%	Motoyoshi, Yoichi	Electron microprobe (EMP)	Sum of measured ThO2 and ThO2 equivalent of the measured UO2
6	Lead oxide	PbO	%	Motoyoshi, Yoichi	Electron microprobe (EMP)
7	Age, dated	Age dated	ka	Motoyoshi, Yoichi
8	Age, error	Age e	±	Motoyoshi, Yoichi

License:

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

Size:

707 data points

Data

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

1 Ord No	2 Sample label	3 UO2 [%]	4 ThO2 [%]	5 ThO2 [%] (Sum of measured ThO2 and ThO2...)	6 PbO [%]	7 Age dated [ka]	8 Age e [±]
1	Sp.No.93022206-Mnz 1	0.07	7.68	7.91	0.17	512000	16000
2	Sp.No.93022206-Mnz 2	0.08	8.87	9.12	0.19	504000	14000
3	Sp.No.93022206-Mnz 4	0.11	7.09	7.47	0.17	523000	17000
4	Sp.No.93022206-Mnz 5	0.16	12.15	12.67	0.27	509000	10000
5	Sp.No.93022206-Mnz 6-1	0.19	7.11	7.73	0.16	496000	17000
6	Sp.No.93022206-Mnz 6-2	0.15	7.28	7.78	0.17	502000	17000
7	Sp.No.93022206-Mnz 7	0.19	7.19	7.82	0.17	499000	17000
8	Sp.No.93022206-Mnz 8	0.14	6.72	7.17	0.16	531000	18000
9	Sp.No.93022206-Mnz 9	0.14	6.91	7.38	0.16	514000	18000
10	Sp.No.93022209-Mnz 17-1	0.20	8.02	8.70	0.19	526000	15000
11	Sp.No.93022209-Mnz 17-2	0.37	7.57	8.79	0.20	536000	15000
12	Sp.No.93022209-Mnz 17-3	0.53	7.65	9.41	0.21	522000	14000
13	Sp.No.93022209-Mnz 18-1	0.99	4.28	7.58	0.17	541000	17000
14	Sp.No.93022209-Mnz 18-2	0.42	8.78	10.18	0.23	543000	13000
15	Sp.No.93022209-Mnz 18-3	0.29	15.01	15.97	0.35	524000	8000
16	Sp.No.93022209-Mnz 19-1	0.31	10.43	11.44	0.25	510000	11000
17	Sp.No.93022209-Mnz 21-1	0.46	6.76	8.28	0.18	521000	16000
18	Sp.No.93022209-Mnz 21-2	0.69	6.09	8.39	0.20	558000	16000
19	Sp.No.93022209-Mnz 21-3	0.65	15.21	17.37	0.39	532000	7000
20	Sp.No.93022209-Mnz 22-1	0.27	11.17	12.05	0.27	520000	11000
21	Sp.No.93022209-Mnz 22-2	0.41	10.40	11.76	0.26	519000	11000
22	Sp.No.93022209-Mnz 22-3	0.21	12.48	13.18	0.30	531000	10000
23	Sp.No.93022209-Mnz 23-1	0.29	14.47	15.44	0.33	508000	8000
24	Sp.No.93022209-Mnz 23-2	0.30	12.29	13.27	0.29	521000	10000
25	Sp.No.93022209-Mnz 24-1	0.22	10.32	11.05	0.25	532000	12000
26	Sp.No.93022209-Mnz 24-2	0.19	10.31	10.93	0.25	542000	12000
27	Sp.No.93022209-Mnz 24-3	0.20	10.31	10.98	0.24	525000	12000
28	Sp.No.93022209-Mnz 24-4	0.14	11.85	12.31	0.27	513000	11000
29	Sp.No.93022209-Mnz 24-5	0.19	10.14	10.78	0.24	520000	12000
30	Sp.No.93022222-Mnz 3-1	0.41	7.95	9.31	0.20	506000	14000
31	Sp.No.93022222-Mnz 3-2	0.14	9.52	9.98	0.21	489000	13000
32	Sp.No.93022222-Mnz 3-3	0.13	9.38	9.82	0.19	466000	13000
33	Sp.No.93022222-Mnz 3-4	0.14	8.81	9.28	0.20	503000	14000
34	Sp.No.93022222-Mnz 3-5	0.14	9.14	9.60	0.20	501000	14000
35	Sp.No.93022222-Mnz 3-6	0.65	7.95	10.09	0.22	509000	13000
36	Sp.No.93022222-Mnz 3-7	0.15	9.18	9.67	0.21	507000	13000
37	Sp.No.93022222-Mnz 3-8	0.44	7.96	9.41	0.21	532000	14000
38	Sp.No.93022222-Mnz 3-9	0.30	8.82	9.81	0.19	469000	13000
39	Sp.No.93022222-Mnz 3-10	0.12	8.56	8.97	0.19	505000	15000
40	Sp.No.93022222-Mnz 6-1	0.26	12.74	13.63	0.56	960000	10000
41	Sp.No.93022222-Mnz 6-2	0.45	14.39	15.93	0.58	853000	8000
42	Sp.No.93022222-Mnz 6-5	0.46	14.27	15.83	0.58	862000	8000
43	Sp.No.93022222-Mnz 6-6	0.48	12.90	14.53	0.46	750000	9000
44	Sp.No.93022222-Mnz 6-11	0.42	11.20	12.60	0.36	674000	10000
45	Sp.No.93022223-Mnz 3	0.10	10.33	10.67	0.23	511000	12000
46	Sp.No.93022223-Mnz 5	0.20	8.81	9.48	0.19	478000	14000
47	Sp.No.93022223-Mnz 6	0.17	7.45	8.03	0.16	473000	16000
48	Sp.No.93022223-Mnz 8	0.09	10.19	10.50	0.22	485000	12000
49	Sp.No.93022223-Mnz 10	0.21	8.22	8.92	0.20	521000	15000
50	Sp.No.93022225-Mnz 11-15	0.20	8.26	8.92	0.20	525000	15000
51	Sp.No.93022225-Mnz 11-16	1.93	7.31	13.73	0.32	551000	9000
52	Sp.No.93022225-Mnz 11-17	0.20	12.62	13.30	0.29	513000	10000
53	Sp.No.93022225-Mnz 11-19	0.21	8.26	8.96	0.20	521000	15000
54	Sp.No.93022225-Mnz 11-20	0.54	5.57	7.36	0.17	549000	18000
55	Sp.No.93022225-Mnz 11-21	0.53	5.90	7.66	0.18	542000	17000
56	Sp.No.93022225-Mnz 11-22	0.53	5.59	7.36	0.18	564000	18000
57	Sp.No.93022225-Mnz 11-23	2.54	6.26	14.71	0.37	586000	9000
58	Sp.No.93022225-Mnz 11-24	1.49	4.95	9.88	0.23	551000	13000
59	Sp.No.93022225-Mnz 12-1	0.79	6.91	9.62	0.40	959000	13000
60	Sp.No.93022225-Mnz 12-2	1.35	7.16	11.73	0.38	766000	11000
61	Sp.No.93022225-Mnz 12-3	1.30	6.67	11.05	0.37	780000	12000
62	Sp.No.93022225-Mnz 12-4	1.51	6.77	11.86	0.40	785000	11000
63	Sp.No.93022225-Mnz 12-5	1.14	5.54	9.47	0.40	985000	14000
64	Sp.No.93022225-Mnz 12-6	1.28	6.82	11.16	0.41	850000	12000
65	Sp.No.93022225-Mnz 12-7	1.38	6.52	11.20	0.40	839000	12000
66	Sp.No.93022225-Mnz 12-8	1.04	7.26	10.78	0.38	828000	12000
67	Sp.No.93022225-Mnz 12-9	0.75	7.18	9.79	0.46	1078000	13000
68	Sp.No.93022225-Mnz 12-10	0.31	7.15	11.61	0.40	713000	11000
69	Sp.No.93022225-Mnz 12-11	0.77	7.13	9.78	0.39	926000	13000
70	Sp.No.93022231-Mnz 1	0.67	7.76	9.99	0.24	559000	13000
71	Sp.No.93022231-Mnz 3-1	0.12	6.56	6.96	0.16	541000	19000
72	Sp.No.93022231-Mnz 3-2	0.14	6.17	6.62	0.15	541000	20000
73	Sp.No.93022231-Mnz 3-3	0.09	7.08	7.38	0.16	523000	18000
74	Sp.No.93022231-Mnz 3-4	0.14	6.22	6.67	0.15	530000	20000
75	Sp.No.93022231-Mnz 3-5	0.10	5.67	6.01	0.12	477000	22000
76	Sp.No.93022231-Mnz 3-6	0.13	6.30	6.72	0.15	519000	19000
77	Sp.No.93022231-Mnz 3-7	0.10	5.32	5.67	0.12	486000	23000
78	Sp.No.93022231-Mnz 3-8	0.12	6.65	7.04	0.15	518000	18000
79	Sp.No.93022231-Mnz 3-9	0.11	7.85	8.20	0.17	502000	16000
80	Sp.No.93022231-Mnz 3-10	0.10	5.71	6.06	0.13	504000	22000
81	Sp.No.93022231-Mnz 3-11	0.13	7.95	8.38	0.19	521000	16000
82	Sp.No.93022231-Mnz 3-12	0.09	10.80	11.11	0.24	504000	12000
83	Sp.No.93022231-Mnz 3-13	0.12	5.86	6.26	0.14	527000	21000
84	Sp.No.93022231-Mnz 3-14	0.19	7.49	8.13	0.18	523000	16000
85	Sp.No.93022231-Mnz 3-15	0.12	6.93	7.33	0.15	489000	18000
86	Sp.No.93022231-Mnz 3-16	0.20	7.71	8.36	0.17	492000	16000
87	Sp.No.93022231-Mnz 3-17	0.13	6.25	6.68	0.15	522000	19000
88	Sp.No.93022231-Mnz 3-18	0.10	7.32	7.65	0.18	562000	17000
89	Sp.No.93022231-Mnz 3-19	0.07	7.17	7.41	0.14	453000	18000
90	Sp.No.93022231-Mnz 3-20	0.08	7.11	7.38	0.15	473000	18000
91	Sp.No.93022231-Mnz 3-21	0.11	9.89	10.27	0.22	516000	13000
92	Sp.No.93022231-Mnz 3-22	0.10	4.89	5.22	0.11	505000	25000
93	Sp.No.93022231-Mnz 4-1	0.11	6.95	7.31	0.16	521000	18000
94	Sp.No.93022231-Mnz 4-2	0.12	7.34	7.73	0.17	511000	17000
95	Sp.No.93022231-Mnz 4-3	0.12	7.65	8.05	0.18	537000	16000
96	Sp.No.93022231-Mnz 4-4	0.11	7.53	7.88	0.16	490000	17000
97	Sp.No.93022231-Mnz 4-5	0.14	7.74	8.19	0.18	514000	16000
98	Sp.No.93022231-Mnz 4-6	0.12	5.92	6.31	0.14	534000	21000
99	Sp.No.93022231-Mnz 7	0.28	4.45	5.39	0.13	548000	24000
100	Sp.No.93022231-Mnz 9	0.27	7.31	8.19	0.18	519000	16000
101	Sp.No.93022231-Mnz 10	0.16	6.33	6.86	0.15	506000	19000