Processed seismic data of Cruise SO23 1982

In the framework of the IDOE-SEATAR (International Decade of Ocean Exploration - Studies of East Asia Tectonics and Resources) Program, the Federal Institute for Geosciences and Natural Resources carried out a geophysical survey in the Sulu Sea during the period from March 11, 1982 to April 15, 1982 using the German research vessel R/V SONNE. The SONNE cruise no. SO-23 continued SEATAR-related studies of BGR which have been carried out during the Southeast Asian Cruise of the VALDIVIA (VA-16) in 1977. During SONNE cruise no. SO-23, multi-channel reflection measurements were carried out in parallel with magnetic, gravimetric, and sea-beam measurements on 21 lines with a total length of 3,300 km in the Sulu Sea. In the NW Sulu Basin, situated between the shelf of East Palawan in the north and the volcanic Cagayan Ridge in the south, a 50 - 100 km wide graben-like basin exists which is filled with thick Neogene and pre-Middle Miocene sediments. The basin trends east-northeast. At longitude 119°E it bends to a north-south direction. The dominating structural element within the sedimentary graben-like basin is a diapiric-chaotic zone about 25 km wide, which was only detectable west of longitude 120°E. The base of the elongated diapiric-chaotic zone, which might represent a tectonically mobilized equivalent of the Crocker Formation (Middle Miocene - Lower Oligocene) is difficult to define in the seismic monitor records. The configuration and the internal structural style of individual structures of the diapiric-chaotic zone, which can be followed over length of about 150 km, seem to resemble those of the oil-bearing province offshore western Sabah. In the eastern part of the NW-Sulu Basin east of longitude 119°E, several north-trending anticlines of presumably Middle Miocene age and locally volcanic intrusions of presumably Plio-Pleistocene age have been observed. During the second leg of the cruise SO-23 in the southeastern part of the South China Sea (April 16, 1982, to May 9, 1982) multi-channel seismic reflection measurements were carried out in parallel with magnetic, gravimetric, and sea-beam measurements on 19 lines with a total length of 3,570 km in the southeastern part of the South China Sea, including the area of the Dangerous Grounds. In addition, 2,280 km of profile was surveyed with only magnetics, gravity, and sea-beam measurements. A complex structural style was observed in the investigated part of the Dangerous Grounds, South China Sea, which is believed to be part of a microcontinental block which rifted from the continental margin of Asia in the Early Paleogene/Late Mesozoic time. There are prospective depocenters and structures trending NE-SW, E-W, and N-S in the southwestern part, i.e. the area west of longitude 117.5°E (units 2, 3, 4). Unit 4 contains a series of half-grabens with thick sedimentary infill. An imbricated melange of pre-Middle Miocene age seems to exist only off southern Palawan. The dominating structural trend in the area northeast of Reed Bank is NW-SE. Oceanic crust characterized by NW-trending magnetic lineations (anomalies 8 to 12 ?) was observed north of latitude 12°N and between longitude 118°E and the Manila Trench.

Citation proposal
. Processed seismic data of Cruise SO23 1982. https://gdk.gdi-de.org/geonetwork/srv/api/records/a6d0adad-9b94-4dcf-9fcd-df2aee2b1408

INSPIRE
SDS

INSPIRE

Identification

File identifier: a6d0adad-9b94-4dcf-9fcd-df2aee2b1408 XML

Hierarchy level: Dataset

Online resource

Resource identifier

code: a27585b9-ee68-46d3-c889-349a9a26f535

Metadata language: English

Spatial representation type: Vector

Encoding

Format: Shapefile

Version: n/a

Projection

Classification of data and services

Topic category

Geoscientific information

Classification of data and services

Coupled resource

Classification of data and services

Coupled resource

Keywords

GEMET - INSPIRE themes, version 1.0 ( Theme )

Geologie
geology

GEMET - Concepts, version 2.4 ( Theme )

geophysics
Geophysik
raw material
Rohstoff

Other keywords

Keywords ( Theme )

Marine geology
Meeresgeologie
Seismics
Seismik
Two-dimensional seismic reflection
zweidimensionale Reflektionsseismik

Keywords ( Place )

South China Sea
Südchinesisches Meer
Sulu Sea
Sulu-See
Palawan

Geographic coverage

Temporal reference

Temporal extent

Date ( Creation ): 1982-05-09

Quality and validity

Lineage: In the period from 11th March to 15th April 1982 and from 16th April to 9th May 1982 on SONNE cruise SO-23 BGR acquired seismic lines in the Sulu Sea and in the South China Sea (Dangerous Grounds). The lines SO23-02A, SO23-03, SO23-04, SO23-08, SO23-08A, SO23-09, SO23-11, SO23-12, SO23-13, SO23-14, SO23-14A, SO23-16, SO23-20, SO23-21 and SO23-29A consist of raw data. The lines SO23-22, SO23-22A, SO23-23, SO23-24, SO23-25, SO23-26, SO23-27, SO23-28, SO23-29, SO23-30, SO23-31, SO23-32, SO23-33, SO23-34, SO23-35, SO23-35A, SO23-36, SO23-37, SO23-39, SO23-39A and SO23-40 are stacked data. The lines SO23-01, SO23-01A, SO23-02, SO23-05, SO23-06, SO23-07, SO23-10, SO23-17, SO23-18, SO23-19 and SO23-38 are migrated data.

Conformity

Explanation: siehe dazu die angegebene Durchführungsbestimmung

Restrictions on access and use

Access constraints: Allgemeine Geschäftsbedingungen, siehe http://www.bgr.bund.de/AGB - General terms and conditions, see http://www.bgr.bund.de/AGB_en. Die bereitgestellten Informationen sind bei Weiterverwendung wie folgt zu zitieren: Datenquelle: SO23 1982, (c) BGR, Hannover, 2019