Citation:

dsdp.proc.5657.138.1980

Name: (Table 1) Geochemistry of ash layers at DSDP Leg 57 Holes
Published: 1980
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

The study of the main characteristics of ash layers in Leg 57 cores shows that they are suitable for an analysis of the effect on eruptive activity of their distribution. We found (1) sediment recovery good and ash layers numerous; (2) sedimentary environment generally free from terrigenous clastic material; (3) reworking limited; (4) volcanic glass very acidic, ranging from rhyolitic to rhyodacitic composition; and (5) alteration and diagenesis negligible above the lower Miocene.

The curves of explosive volcanic activity in Holes 438, 439, and 440 display two stages of high activity: an early one around 16 m.y. and a late one starting 5 m.y. B.P., both stages being separated by an upper Miocene quiescence. Detail in these results is limited by the chemical composition of the glass and accounts only for trends in explosive acid volcanism. Nevertheless, results are roughly in agreement with other data from the Northwest Pacific, although some discrepancies in the correlation of intensity of the episodes occur. The data from Leg 57 support the hypothesis of synchronous pulses in explosive volcanism.

Project(s):

Deep Sea Drilling Project (DSDP)

Coverage:

Median Latitude: 40.272180 * Median Longitude: 143.530200 * South-bound Latitude: 39.735500 * West-bound Longitude: 143.235800 * North-bound Latitude: 40.630000 * East-bound Longitude: 143.929000

Date/Time Start: 1977-10-19T00:00:00 * Date/Time End: 1977-11-10T00:00:00

Minimum Elevation: -4509.0 m * Maximum Elevation: -1558.0 m

Event(s):

57-438A * Latitude: 40.629800 * Longitude: 143.235800 * Date/Time: 1977-10-19T00:00:00 * Elevation: -1558.0 m * Penetration: 878 m * Recovery: 535.5 m * Location: North Pacific/BASIN * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 83 cores; 780.5 m cored; 0 m drilled; 68.6 % recovery

57-438B * Latitude: 40.630000 * Longitude: 143.246700 * Date/Time: 1977-10-19T00:00:00 * Elevation: -1564.0 m * Penetration: 1040.7 m * Recovery: 84.2 m * Location: North Pacific/BASIN * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 23 cores; 206.5 m cored; 0 m drilled; 40.8 % recovery

57-439 * Latitude: 40.626800 * Longitude: 143.310500 * Date/Time: 1977-11-03T00:00:00 * Elevation: -1656.0 m * Penetration: 1157.5 m * Recovery: 160 m * Location: North Pacific/TRENCH * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 38 cores; 333.5 m cored; 0 m drilled; 48 % recovery

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device
1	Event label	Event
2	Latitude of event	Latitude
3	Longitude of event	Longitude
4	Elevation of event	Elevation	m
5	Sample code/label	Sample label		Cadet, Jean-Paul	DSDP/ODP/IODP sample designation
6	Epoch	Epoch		Cadet, Jean-Paul
7	Silicon dioxide	SiO2	%	Cadet, Jean-Paul	Electron microprobe (EMP)
8	Titanium dioxide	TiO2	%	Cadet, Jean-Paul	Electron microprobe (EMP)
9	Aluminium oxide	Al2O3	%	Cadet, Jean-Paul	Electron microprobe (EMP)
10	Iron oxide, FeO	FeO	%	Cadet, Jean-Paul	Electron microprobe (EMP)
11	Manganese oxide	MnO	%	Cadet, Jean-Paul	Electron microprobe (EMP)
12	Magnesium oxide	MgO	%	Cadet, Jean-Paul	Electron microprobe (EMP)
13	Calcium oxide	CaO	%	Cadet, Jean-Paul	Electron microprobe (EMP)
14	Sodium oxide	Na2O	%	Cadet, Jean-Paul	Electron microprobe (EMP)
15	Potassium oxide	K2O	%	Cadet, Jean-Paul	Electron microprobe (EMP)
16	Total	Total	%	Cadet, Jean-Paul	Electron microprobe (EMP)

License:

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

Size:

180 data points

Data

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

1 Event	2 Latitude	3 Longitude	4 Elevation [m]	5 Sample label	6 Epoch	7 SiO2 [%]	8 TiO2 [%]	9 Al2O3 [%]	10 FeO [%]	11 MnO [%]	12 MgO [%]	13 CaO [%]	14 Na2O [%]	15 K2O [%]	16 Total [%]
57-438A	40.6298	143.2358	-1558	57-438A-2-5,20	Pleistocene	75.92	0.17	12.51	1.29	0.00	0.25	1.36	1.98	2.99	96.47
57-438A	40.6298	143.2358	-1558	57-438A-6-2,72	upper Pliocene	74.79	0.13	12.18	1.32	0.00	0.09	1.21	2.44	3.15	95.31
57-438A	40.6298	143.2358	-1558	57-438A-11-4,38	upper Pliocene	73.68	0.04	11.84	1.42	0.67	0.13	1.36	3.17	1.90	94.21
57-438A	40.6298	143.2358	-1558	57-438A-14-4,43	lower Pliocene	73.43	0.29	11.33	2.16	0.02	0.33	1.78	2.57	1.82	93.73
57-438A	40.6298	143.2358	-1558	57-438A-24-1,98	lower Pliocene	72.88	0.11	11.99	0.74	0.09	0.09	1.02	4.58	2.09	93.59
57-438A	40.6298	143.2358	-1558	57-438A-32-3,90	lower Pliocene	73.93	0.17	12.18	0.91	0.08	0.21	1.99	2.91	1.96	94.34
57-438A	40.6298	143.2358	-1558	57-438A-33-4,73	lower Pliocene	74.79	0.13	12.15	0.87	0.07	0.16	1.02	2.16	3.31	94.66
57-438A	40.6298	143.2358	-1558	57-438A-43-6,11	upper Miocene	73.21	0.00	12.12	0.52	0.09	0.03	0.39	2.13	4.37	92.86
57-438A	40.6298	143.2358	-1558	57-438A-59-3,67	upper Miocene	71.97	0.08	12.12	1.88	0.08	0.14	1.46	2.39	2.57	92.69
57-438B	40.6300	143.2467	-1564	57-438B-4-1,77	middle Miocene	74.77	0.17	11.69	0.77	0.04	0.04	0.87	2.83	3.86	95.04
57-439	40.6268	143.3105	-1656	57-439-8-2,124	lower Miocene	69.03	0.43	14.50	2.25	0.01	0.45	3.17	2.36	2.13	94.33
57-439	40.6268	143.3105	-1656	57-439-11-3,71	lower Miocene	71.85	0.27	12.14	1.68	0.06	0.22	1.31	2.63	2.76	92.92
57-440	39.7388	143.9290	-4509	57-440-4-6,134	Pleistocene	73.49	0.03	13.11	0.56	0.13	0.04	2.25	3.01	3.26	95.88
57-440B	39.7355	143.9290	-4509	57-440B-3-1,32	Pleistocene	75.85	0.17	11.82	1.19	0.03	0.16	1.32	1.86	1.81	94.21
57-440B	39.7355	143.9290	-4509	57-440B-34-2,27	upper Pliocene	74.43	0.17	12.17	1.01	0.12	0.20	1.02	2.37	1.64	93.13