摘要:

References earlier than 1953 are not listed below but may be found in the following reports:

ISSN:0028-8306    

DOI:10.1080/00288306.1967.10420219

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

Bathymetric and magnetic data from the Lord Howe Rise — New Caledonia Basin — Norfolk Ridge area form the basis of a remterpretation of the structure and geological history of the Melanesian Complex in relation to the South-West Pacific Ocean. Lord Howe Rise and Norfolk Ridge and their extensions east of New Zealand belong to a system of orogenic belts which developed in succession starting in the Upper Paleozoic marginal to Australia and Antarctica, the source of sediment. Crustal spreading is superimposed on the evolution of the Lord Howe Rise — Campbell and Melanesian geosynclines. This spreading had already begun in the Triassic with the moving apart of Australia and Antarctica and resulted in a foundering and fracturing of the Melanesian Rise and Ridge system and the creation of new ocean basins mainly during the Mesozoic. The movement of individual crustal blocks was directed away from the Indian-Antarctic and Pacific-Antarctic Rises and also from a presumably incipient mid-Tasman Rise. Tension in the marginal zone resulted in the formation of the outer Melanesian Belt, an island arc, volcanic are, and trench complex. Two major fracture systems can be recognised in the South-West Pacific; one with dominant north-east-south-west strikes, reflecting the process of crustal spreading, the other, a major shear zone with dominant north-west-south-east strikes, possibly the effect of the movement of the earth's axis of rotation with respect to the crust.

ISSN:0028-8306    

DOI:10.1080/00288306.1967.10420220

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

Total magnetic force anomalies across Norfolk Ridge are caused by basaltic extrusions which are normally magnetised with an average magnetisation of 1.4 × 10−2e.m.u. These rocks have a minimum thickness of about 1.–2.0 km in the central part of the ridge, and are covered by a thin layer of non-magnetic deposits.

ISSN:0028-8306    

DOI:10.1080/00288306.1967.10420221

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

The Bouguer anomaly map of Viti Levu in the Fiji Group consists essentially of a gravity “low” surrounded by gravity “highs”. The “low” can be explained partly by the effect of the younger rocks which have a specific gravity 0.4 g/cm3less than the older rocks (Lower Tertiary), and partly by a relative thickening of the crust by about 10 km. The average crustal thickness is about 30 km which supports the geological evidence that the Fiji islands are continental.

ISSN:0028-8306    

DOI:10.1080/00288306.1967.10420222

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor