Accession Number:

ADA478461

Title:

Geochemical Characterization of Concentrated Gas Hydrate Deposits on the Hikurangi Margin, New Zealand: Preliminary Geochemical Cruise Report

Descriptive Note:

Memorandum rept. 20 Jun-3 Jul 2006

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV

Report Date:

2008-02-29

Pagination or Media Count:

44.0

Abstract:

This report provides a preliminary summary of geochemical contribution to methane hydrate research and exploration on the Hikurangi Margin, off the northeastern coast of New Zealand from June 20 to July 3, 2006. Geochemical porewater profiles taken from shallow piston cores and vertical fluid migration measured with heatflow probing were compared with seismic summaries of potential deep sediment hydrates deposits. Research goals for this expedition include 1 Refine geophysical, geochemical, and microbiological technologies for prospecting hydrate distribution and content 2 Contribute to establishing high-priority geographical regions of prospective interest, in terms of methane volume estimates 3 Prediction of environmental effects and geologic risks at the continental margin associated to the natural resource occurrence and resource exploitation and 4 Expand understanding of the biogeochemical parameters and associated microbial community diversity in shallow sediments that influences the porewater sulfate gradient observed through anaerobic methane oxidation profiles. Scientists from New Zealand, United States, Belgium, Canada and Germany, representing 11 university and government research institutions contributed to this expedition. Expertise of the science team resulted in the contribution of geochemical, geophysical, geological, molecular ecology, and biological data to address ocean water column, sediment, and porewater research questions.

Subject Categories:

  • Biological Oceanography
  • Geology, Geochemistry and Mineralogy
  • Mining Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE