Quantifying uncertainties in marine volcanic ash layer records from ocean drilling cores

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doi: 10.1016/j.margeo.2014.08.010
Author(s): Mahony, Sue H.; Sparks, R. S. J.; Barnard, Nick H.
Author Affiliation(s): Primary:
University of Bristol, School of Earth Sciences, Bristol, United Kingdom
Volume Title: Marine Geology
Source: Marine Geology, Vol.357, p.218-224. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0025-3227 CODEN: MAGEA6
Note: In English. 12 refs.; illus., incl. 3 tables
Summary: Ocean drilling provides a global record of deposits throughout the oceans. An international collaborative ocean research programme was established in 1966, and the International Ocean Discovery Program (IODP) is the most recent manifestation of this. During each expedition a large amount of data are generated and collected by the shipboard science team. It could be suggested that due to the different staff and objectives during each expedition there would be significant variations in the consistency of data recorded in the shipboard visual core descriptions (VCDs). Use of shipboard VCD data in a global study of volcanism through time required the ground truthing of VCD data, to assess the consistency of ash layer reporting and to identify the amount of under/over recording of volcanic ash layers in cores. Approximately 1400 ash layers in DSDP, ODP, IODP and JAMSTEC cores were examined and it was found that on average 70-75% of recorded volcanic ash layers were present as described, an average of 17-20% were over recorded and 10-15% were under recorded. A number of factors could contribute to this variability, such as VCD format, lack of time for shipboard sampling of every ash layer, significant ash layer colour changes since time of coring, or differences in VCD recording and volcanic ash layer identification and description schemes between expeditions. These findings are important and will allow greater confidence in further studies based on data compiled from shipboard VCDs. Abstract Copyright (2014) Elsevier, B.V.
Year of Publication: 2014
Research Program: DSDP Deep Sea Drilling Project
IODP Integrated Ocean Drilling Program
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 06 Petrology, Sedimentary; 07 Marine Geology and Oceanography; Core; Deep Sea Drilling Project; Expedition 322; Ground truth; IPOD; Identification; Integrated Ocean Drilling Program; Japan Sea; Leg 127; Leg 186; Leg 190; Leg 31; Leg 56; Leg 87; Marine sediments; NanTroSEIZE; North Pacific; Northwest Pacific; Ocean Drilling Program; Pacific Ocean; Sediments; Shikoku Basin; Thickness; Uncertainty; Volcaniclastics; West Pacific; World ocean
Coordinates: N324400 N325000 E1365600 E1365200
N383655 N435912 E1392451 E1343209
N384000 N391500 E1432100 E1431900
N313000 N324500 E1351500 E1340000
N120000 N420000 E1380000 E1240000
N390000 N400000 E1460000 E1430000
N314730 N402800 E1435736 E1335115
Record ID: 2015023685
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands