Processed seismic data of Cruise SO267 ARCHIMEDES I 2018

The cruise SO267 ARCHIMEDES I started on December 11th, 2018 in Suva (Fidji) and ended in Suva on January 26th, 2019. Over half of the world´s presently exploited metal deposits were formed during major episodes of crustal growth related to subduction and microplate tectonics. These processes are observed today along the entire margin of the Western Pacific, where complex microplate mosaics offer unique opportunities to study accretion and the emergence of new continental crust. The focus of SO267 was a series of crustal cross-sections at the outer edge of the Indo- Australian Plate, in the largely uncharted waters of the Kingdom of Tonga. The project, entitled “Arc Rifting, Metallogeny and Microplate Evolution – An Integrated Geodynamic, Magmatic and Hydrothermal Study of the Fonualei Rift System”, was designed to document the geological evolution of an emerging microplate mosaic in the NE Lau Basin, a region with some of the fastest growing crust on Earth, and to better understand the sequence of events that cause arc rifting and related magmatic-hydrothermal activity. Using a coordinated approach of high-resolution 2D seismics, electromagnetics and sampling, ARCHIMEDES I imaged the deep structure of the Fonualei Rift system and adjoining back-arc crust of the Niuafo’ou microplate. The goal was to address a major unsolved question concerning crustal growth in complex arc-backarc systems: at what stage in the structural and thermal evolution of the crust does arc rifting occur and seafloor spreading initiate? Planned operations included large-scale reflection and refraction seismic surveys, and a dense program of gravity, magnetics, heat flow, bathymetric mapping and sidescan imaging using the AUV ABYSS and ship-based multibeam systems. This ambitious program was made possible by a close collaboration between GEOMAR and BGR scientists, bringing together diverse expertise and state-of-the-art technologies. To understand the large-scale tectonic processes, we studied 6 different locations within an area of 300 km x 300 km: i) the southern Fonualei Rift Spreading Center (S-FRSC), ii) the region between the S-FRSC and the Eastern Lau Spreading Center (FRSC-ELSC Transfer Zone), iii) the northern tip of the Eastern Lau Spreading Center (ELSC), iv) the northern tip of the Fonualei Rift system (N-FRSC), v) the Mangatolu Triple Junction (MTJ), and vi) the southward propagating Northeast Lau Spreading centre (NELSC). The combined data represent one of the most comprehensive records of microplate formation from the modern oceans.

INSPIRE

Identification

File identifier
b8466d2b-d872-4f2b-acae-7be513628051 XML
Hierarchy level
Dataset
Online resource
Resource identifier
code

f12ee0bb-2e87-d6c7-639f-4d04419122f3
Metadata language
English
Encoding
Format

Shapefile
Version

n/a
Projection
code
EPSG:4326
 

Classification of data and services

Topic category
  • Geoscientific information
 

Classification of data and services

Coupled resource

Coupled resource
 
 

Classification of data and services

Coupled resource

Coupled resource
 
 

Keywords

GEMET - INSPIRE themes, version 1.0

  • Geologie

  • geology

GEMET - Concepts, version 2.4

  • geophysics

  • Geophysik

  • raw material

  • Rohstoff

Other keywords

Theme

  • Marine geology

  • Meeresgeologie

  • Seismics

  • Seismik

  • Two-dimensional seismic reflection

  • zweidimensionale Reflektionsseismik
Place

  • Lau Basin

  • Lau-Becken

  • Tonga

  • Fidji
 
 

Geographic coverage

N
S
E
W
thumbnail


 

Temporal reference

Temporal extent
Temporal extent
Date (Publication)
2019-01-26
 

Quality and validity

Lineage

During the period from the 11th of December 2018 to the 26th of January 2019 BGR acquired seismic lines in the Lau Basin between Fidji and Tonga Islands. The lines BGR18-201 to BGR18-206 consist of migrated data.
 

Conformity

Conformity
Conformity
 

Conformity

Conformity
Conformity
Explanation

siehe dazu die angegebene Durchführungsbestimmung
 

Restrictions on access and use

Access constraints
Es gelten keine Zugriffsbeschränkungen
Access constraints

Allgemeine Geschäftsbedingungen, siehe https://www.bgr.bund.de/AGB - General terms and conditions, see https://www.bgr.bund.de/AGB_en . Die bereitgestellten Informationen sind bei Weiterverwendung wie folgt zu zitieren: Datenquelle: SO267 ARCHIMEDES I 2018, (c) BGR, Hannover, 2021

 

Responsible organization (s)

Contact for the resource
Organisation name

Federal Institute for Geosciences and Natural Resources
Email

Marine_Seismik@bgr.de

 

Responsible organization (s)

Contact for the resource
Organisation name

Federal Institute for Geosciences and Natural Resources
Email

Marine_Seismik@bgr.de

 

Metadata information

Contact for the metadata
Organisation name

Bundesanstalt für Geowissenschaften und Rohstoffe (BGR)
Email

geodatenmanagement@bgr.de

Date stamp
2023-11-16
Metadata language
English
Character set
UTF8
 
 

SDS

Conformance class 1: invocable

Access Point URL
Endpoint URL
Technical specification
 

Conformance class 2: interoperable

Access constraints

Limitation
 

Use constraints

Limitation
 

Responsible custodian

Contact for the resource
 
 
 

Overviews

overview

Spatial extent

N
S
E
W
thumbnail


Keywords

Marine geology Meeresgeologie Seismics Seismik Two-dimensional seismic reflection zweidimensionale Reflektionsseismik
GEMET - Concepts, version 2.4
Geophysik Rohstoff geophysics raw material
GEMET - INSPIRE themes, version 1.0
Geologie geology

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Associated resources

Not available