Comment on “Sedimentation Controls on Methane‐Hydrate Dynamics Across Glacial/Interglacial Stages: An Example From International Ocean Discovery Program Site U1517, Hikurangi Margin”

Type Article
Date 2020-06
Language English
Author(s) Sultan NabilORCID1
Affiliation(s) 1 : Ifremer, REM/GM/LAD Plouzané, France
Source Geochemistry Geophysics Geosystems (1525-2027) (American Geophysical Union (AGU)), 2020-06 , Vol. 21 , N. 6 , P. e2019GC008846 (4p.)
DOI 10.1029/2019GC008846
Keyword(s) Hikurangi, hydrate, IODP, salinity
Abstract

In the IODP 372A proposal, working hypotheses used with respect to actively deforming gas hydrate‐bearing landslides were based on an initial calculation considering gas hydrate to occur in fresh water. This initial inaccuracy leads to predict the base of methane hydrate stability zone (MHSZ) to be at around 162 meters below the seafloor (mbsf) at site U1517 while it is expected to be between 85 and 128 mbsf. It is most interesting that important negative chloride anomalies were measured well below the theoretical MHSZ without direct evidence of the presence of gas hydrate. These anomalies are usually a strong indication of gas hydrate occurrence. This initial inaccurate hypothesis provides the opportunity to evaluate the effectiveness of the indirect salinity detection method to quantify gas hydrate.

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Sultan Nabil (2020). Comment on “Sedimentation Controls on Methane‐Hydrate Dynamics Across Glacial/Interglacial Stages: An Example From International Ocean Discovery Program Site U1517, Hikurangi Margin”. Geochemistry Geophysics Geosystems, 21(6), e2019GC008846 (4p.). Publisher's official version : https://doi.org/10.1029/2019GC008846 , Open Access version : https://archimer.ifremer.fr/doc/00628/74043/