摘要:

Evidence is presented from moraines and historical records of the wasting and retreat of the glaciers of Mt. Ruapehu before 1955. The changes arc compared with those on the Hooker and Mueller glaciers in the Southern Alps.

ISSN:0028-8306    

DOI:10.1080/00288306.1959.10422762

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

The structure and volcanism of the Quaternary volcanic belt in the North Island of New Zealand are discussed in the light ot geophysical evidence. The two major structural features outlined by the gravity survey are the Kaingaroa Plateau, in which the Mesozoic basement rocks are above sea-level, and the Taupo-White Island Depression, in which the basement reaches depths of at least 12,000 ft. Between the two are basement blocks at various stages of subsidence. These features can be closely correlated with surface topography, which indicates recent structural evolution; there is also evidence for a genetic relation between the hydrothermal fields and basement faults.

ISSN:0028-8306    

DOI:10.1080/00288306.1959.10422763

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

First usage of the stratigraphic term Te Kuiti is reviewed, with special considerationof restrictions in its use and of the upper limit of its application. Adoption of the name “Te Kuiti Group” is supported, and a revised definition proposed. Stratigraphical, columns are presented covering an area from Papakura to Taumarunui. The constituent formations of the group are described, their type localities are recorded, and the following new formations are introduced: Mangakotuku Siltstone, Glen Massey Formation (including Elgood Limestone, Dunphail Siltstone, and Glen Massey Sandstone members), Waitetuna Limestone Member of the Aotea Sandstone, Te Akatea Siltstone, Orahiri Limestone, Otorohanga Limestone, and Mangapehi Sandstone.

ISSN:0028-8306    

DOI:10.1080/00288306.1959.10422764

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

Immediately south of the upper Taylor glacier lies a small ice-free area including three minor dry valleys provisionally named the Arena, Beacon, and Turnabout. The rocks exposed are Beacon sediments intruded by dolerite sills and dykes. Three lithological members are recognized in the sediments. Two petrographically distinct types of dolerite are present. Glacial and post-glacial erosion has produced a land form controlled by the lithology and structural relations of the sediments and dolerite.

ISSN:0028-8306    

DOI:10.1080/00288306.1959.10422765

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

Two principles are put forward to explain secondary faulting and transcurrent splay faulting at the intersections of clockwise with anti-clockwise transcurrent faults. The first is based on the convergence and divergence of material respectively in the compressional and tensional sectors, between the intersecting transcurrent faults. The second principle is based on the opposed sense of lateral displacement at the intersection of transcurrent faults. Either or both can be used to explain given examples.

ISSN:0028-8306    

DOI:10.1080/00288306.1959.10422766

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

Observations on the New Plymouth Sugar Loaf Islands and their framework indicate that the dacitic intrusions “protruded” to the surface in a nearly solid state. They are on the summit of a much larger substructure with its greatest dimension in a north-east-south-west direction. Huge blocks of sedimentary sandy mudstone and pyroclastics were brought upwards on the flanks of rising plugs. Subsequently, these blocks slumped down the sides of the composite volcano, in all likelihood sub-aqueously. The protrusion of the Sugar Loaf plugdomes marks the latest phase of igneous activity, and post-dates the deposition of the Lower Pouakai Agglomerate. The movement terminated before the end of the deposition of the Upper Pouakai Sands.

ISSN:0028-8306    

DOI:10.1080/00288306.1959.10422767

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

Drillholes penetrating below the hot aquifer at Wairakei have encountered diminishing temperatures, suggesting that the source of the hot water is not directly helow the area now heing exploited. A magnetic survey of the field indicates that hydrothermal alteration by which magnetite is converted to pyrite extends to the greatest depths in the western half of the field, that H2S which is responsible for this conversion is therefore more abundant at depth in the west, and consequently this is the most likely feed source for the hot aquifer. The hot springs and drillholes draw on water percolating through the aquifer from this feed source.

ISSN:0028-8306    

DOI:10.1080/00288306.1959.10422768

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

Trias-Jura rocks of the Awakino-Mahoenui area constitute part of the western limb of the Kawhia Syncline in its southern-most exposure. The syncline is approximately meridional in alignment and pitches northwards at a low angle. Strata have dips varying from nearly vertical in the west of the area to about 15° east at the top of the succession in the east. The strata form the Herangi Range which originated as a north-south fold or the peneplained surface resulting from the post-Hokonui orogeny. This fold is believed to be faulted on its western edge, but while this is also the case on the eastern limb farther north, in the Awakino-Mahoenui area faulting seems not to have occurred at the surface.

ISSN:0028-8306    

DOI:10.1080/00288306.1959.10422769

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

Heavy minerals from coal measure sandstones near Ohai, Tuatapere, Orepuki, Waimumu, and Gore form distinct suites, in most cases derived from immediately adjacent older rocks. This restriction of parent detritus to limited distributive provinces facilitates paleogeographic reconstruction of small, isolated, coal measure basins at the onset of Tertiary sedimentation. Samples from stratigraphically higher marine beds indicate a more even spread and an admixing across Southland of detritus which represents mineralogically three areas of provenance: Fiordland metamorphics and intrusives, Otago schists, and Permian-Jurassic sediments.

ISSN:0028-8306    

DOI:10.1080/00288306.1959.10422770

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

Since late 195614C activities of 16 surface and 22 subsurface samples of sea water have been determined. The distribution of these activities in a section extending from 9° S to 66° S through the South West Pacific Ocean is described and compared with ideas of the nature and movements of water masses inferred from conventional oceanographic data.

ISSN:0028-8306    

DOI:10.1080/00288306.1959.10422771

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor