Data report; Interpretation of cored intervals with greater than one hundred percent core recovery; IODP Expedition 313 used as an example methodology

Online Access: Get full text
doi: 10.2204/iodp.proc.313.202.2018
Author(s): Inwood, Jenny
Integrated Ocean Drilling Program, Expedition 313 Scientists, College Station, TX
Author Affiliation(s): Primary:
University of Leicester, School of Geography, Geology and the Environment, Leicester, United Kingdom
Volume Title: Proceedings of the Integrated Ocean Drilling Program; New Jersey shallow shelf; Expedition 313 of the mission-specific drilling platform from and to Atlantic City, New Jersey (USA); Sites M0027-M0029, 30 April-17 July 2009
Volume Author(s): Mountain, Gregory S.; Proust, Jean-Noël; McInroy, David; Ando, Hisao; Basile, Christophe; Bassetti, Maria Angela; Bjerrum, Christian; Browning, James V.; Hayashi, Takeshi; Hesselbo, Stephen; Hodgson, David; Huang Baoqi; Inwood, Jenny; Kulhanek, Denise; Katz, Miriam E.; Kotthoff, Ulrich; Lee, Youn Soo; Lofi, Johanna; McCarthy, Francine; Miller, Kenneth G.; Monteverde, Donald H.; Mottl, Michael James; Nilsson, Andreas; Otsuka, Hironori; Rabineau, Marina; Stadler, Susanne; Sugarman, Peter J.; Valppu, Henna
Source: Proceedings of the Integrated Ocean Drilling Program; New Jersey shallow shelf; Expedition 313 of the mission-specific drilling platform from and to Atlantic City, New Jersey (USA); Sites M0027-M0029, 30 April-17 July 2009, Gregory S. Mountain, Jean-Noël Proust, David McInroy, Hisao Ando, Christophe Basile, Maria Angela Bassetti, Christian Bjerrum, James V. Browning, Takeshi Hayashi, Stephen Hesselbo, David Hodgson, Huang Baoqi, Jenny Inwood, Denise Kulhanek, Miriam E. Katz, Ulrich Kotthoff, Youn Soo Lee, Johanna Lofi, Francine McCarthy, Kenneth G. Miller, Donald H. Monteverde, Michael James Mottl, Andreas Nilsson, Hironori Otsuka, Marina Rabineau, Susanne Stadler, Peter J. Sugarman and Henna Valppu; Integrated Ocean Drilling Program, Expedition 313 Scientists, College Station, TX. Proceedings of the Integrated Ocean Drilling Program, Vol.313, 14p. Publisher: International Ocean Discovery Program, Washington, DC, United States. ISSN: 1930-1014 CODEN: IDSDA6
Note: In English. 26 refs.; illus.
Summary: Conventionally, depths of core recovered during a drilling and coring expedition are determined by placing the top of the recovered core at the top of the core barrel run that recovered it. During many ocean drilling expeditions, certain intervals of core recovered from a drill run are recorded as 100% or greater, resulting in an overlap in core depths between adjacent runs. There are various reasons for these overlaps; significantly, the presence of clay that expands on recovery, as well as other possibilities including gas expansion, slipped cores recovered by subsequent runs, and disturbances during drilling leading to retrieval of surplus loose material. These intervals of overlap require cautious treatment to avoid potential confusion in analysis if different cores are sampled at apparently equivalent depths. Scientists need to be precise in the explanation of their method of dealing with any such overlaps. During Integrated Ocean Drilling Program Expedition 313, a mixture of siliciclastic sediments were recovered from three sites on the New Jersey shallow shelf. This report identifies intervals of core overlap from the conventional depth determination and analyzes their origin by combining core lithologic observations with notes taken during drilling operations and recorded drilling parameters. Drilling parameters represent an underutilized resource in the interpretation of core recovered during drilling, especially for measurements in which assumptions are made on the quality of the core. Downhole logs provide independent depth control and, through analysis in tandem with equivalent core petrophysical measurements, an evaluation can be made of how to optimally deal with overlapping core intervals. The advantages of the methodology presented go beyond the Expedition 313 examples illustrated here and could be applied to other expeditions.
Year of Publication: 2018
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; Atlantic Ocean; Continental shelf; Cores; Drilling; Expansive materials; Expedition 313; IODP Site M0027; IODP Site M0028; IODP Site M0029; Integrated Ocean Drilling Program; Marine drilling; Marine sediments; New Jersey; North Atlantic; Northwest Atlantic; Sediments; Siliciclastics; United States
Coordinates: N393803 N393803 W0733718 W0733718
N393357 N393357 W0732950 W0732950
N393110 N393110 W0732448 W0732448
Record ID: 2018096716
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.