摘要:

The Mesozoic and Tertiary strata of Hawke's Bay include many sequences of vertically graded, banded sediments, some of which are contemporaneous with sequences of massive sediments deposited in nearby localities. The distribution of the thickness of sediments in Central Hawke's Bay, indicates that a trough-like basin existed in the upper Miocene. Into this basin a thick sequence of banded' sediments was deposited, while at the same time a thin sequence of unstratified beds was laid down in the area surrounding the basin. An investigat10n of the grain sizes in the basin revealed a decrease in grain size in a westerly direction. The sediments were brought in from the east, presumably across a bar which is thought to have separated the basin from the open ocean.

ISSN:0028-8306    

DOI:10.1080/00288306.1958.10422792

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

Soft Tertiary sandstone, mudstone, and conglomerate are preserved in a narrow strip parallel to the Harper Fault, within indurated sandstone and mudstone probably Triassic in age on the east flank of the Southern Alps. The structure of the Tertiary rocks is interpreted principally in terms of mid-Tertiary and late-Tertiary folding, to which some of the complexities of the basement structure are also attributed. Valley deposits and valley form are interpreted as the result of two ice advances during the Last Glaciation.

ISSN:0028-8306    

DOI:10.1080/00288306.1958.10422793

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

Granite in New Zealand is confined to the South Island and Stewart Island. There are three major meridionally trending belts in north-west Nelson—Separation Point to Mt Murchison, Kahurangi Point to Ahaura River, and Paparoa Range to Kongahu Point. Isolated granite masses are known in Westland and extensive areas in Fiordland and Stewart Island. The Separation Point to Mt Murchison granite differs from the others in being essentially a soda-alkali type.

ISSN:0028-8306    

DOI:10.1080/00288306.1958.10422794

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

Heat flow from the thermal areas of Sheet District N94 has been estimated to be 274,000 kcal/sec (3,910 × 106B.Th.U./hr) above 0°C. The figure is based on measurements made during the period March 1951 to April 1952. The heat flow is equivalent to a loss of 24 × 10−6cal/cm2/sec over the whole area covered by the sheet. The heat flow could be produced by the flow upwards of 1,440 kg/sec of water with a temperature of 189°C.

ISSN:0028-8306    

DOI:10.1080/00288306.1958.10422795

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

The Wakarara Range is a greywacke piercement body flanked on the western and southern sides by faults, and on the eastern side by steep-dipping upper Pliocene rocks. The range is separated from the main greywacke block of the Ruahine Range by a long narrow graben—the Ohara depression. Marine sedimentation in the Ohara depression started at least as early as middle Pliocene (lower Waitotaran) and continued until early Pleistocene (lower Nukumaruan) time, when the sea regressed and thick sequences of conglomerates were deposited on a truncated surface of Waitotaran rocks. The Wakarara piercement body emerged in latest Waitotaran time; the southern part rose above sea-level first. Movement of the Wakarara block as a whole took place in a southerly direction.

ISSN:0028-8306    

DOI:10.1080/00288306.1958.10422796

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

It is tentatively submitted that radiocarbon dating ofPodocarpuswood from a well at Foxton suggests that sea-level may have risen about 150 ft during the last 9900 years, but there is no decisive evidence to indicate whether the land at the well site has been stable or tectonicaUy elevated or depressed in recent times.

ISSN:0028-8306    

DOI:10.1080/00288306.1958.10422797

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

This paper deals only with ancient shoreline features found near the northern and eastern shorelines of the Pauatahanui Inlet of Porirua Harbour. Correspondence of the heights of these features with heights of Pleistocene shorelines overseas is remarkably close. Although Porirua Harbour lies in a tectonically unstable environment, a hypothesis advanced by Cotton (1952) suggests that the Harbour itself may have largely escaped the effects of recent differential earth movements. Pleistocene shorelines could well be preserved in such a locality, and terraces are correlated by height with the (post-glacial) thermal maximum, Late Monastirian, Main Monastirian, Tyrrhenian, Milazzian, and Sicilian shorelines of other regions.

ISSN:0028-8306    

DOI:10.1080/00288306.1958.10422798

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

Deep wells sunk for artesian water beneath Christchurch penetrate three formations. The youngest, the Christchurch Formation, consists of marine, estuarine, and fluviatile deposits of which at least the upper part was formed during the post-glacial rise of sea-level. It extends down to more than 200 ft below present sea-level, and radiocarbon dates record part of the rise of sealevel, from — 73 ft 9400 years ago (S83/501) to — 12 ft 6100 years ago (S84/523). Other dates, together with topographic and soil evidence, are interpreted as indicating the 'Subsequent period of development by the Waimakariri River of a fan of gravel over the Christchurch area, probably completed about 2,000 years ago when sea-level was a little higher than at present. The aggradation surface of this fan is termed the Yaldhurst Surface.

ISSN:0028-8306    

DOI:10.1080/00288306.1958.10422799

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

Five distinct periods of major ice advance recorded in the Waimakariri Valley by a variety of glacial and glacifluvial deposits are distinguished by differences of elevation, surface gradients, distribution, weathering, and extent of defacement of original surface detail. Glaciations are grouped and named as follows: Avoca Glaciation (probably multiple, but not subdivided) ; Waimakariri Glaciation (comprising in chronological order Woodstock, Otarama, Blackwater, and Poulter 2.dvances, of which at least the last two were multiple). Interglacial deposits are rare. The Waimakariri glacier system was. a complex pattern of ice streams, including large tributaries mainly from the north-west and distributaries between which transfluence occurred through numerous saddles. The ice in the middle reaches of the main valley was about 4,000 ft thick during the Avoca Glaciation, and perhaps from 500 ft to 1,000 ft thick at the height of later advances. Glacial geomorphic features are essentially the work of the later advances. The Avoca Glaciation, which was the most extensive, corresponds with the Waimaungan Glacial Stage and dates from early in the second half of the Pleistocene. An interglacial stage separates it from the last four advances, which together represent locally the Otiran Glacial Stage. The Otarama advance was the last occasion when ice reached as far as the eastern margin of the mountains, and outwash gravels from this advance built most of the Waimakariri segment of the Canterbury Plain. Several lakes existed temporarily during recessive phases, the largest lake having been at least 10 miles long in the main valley upstream from Poulter River.

ISSN:0028-8306    

DOI:10.1080/00288306.1958.10422800

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor

摘要:

In a preliminary survey of gamma radioactivity of some geothermal areas in the North Island of New Zealand a wide variation in the radioactivities of soils, pools, and sinters was found between separate thermal areas, particularly between sulphate and chloride areas. In the Waiora area, the average radioactivity of hot pools with no overflow was greater than that for hot springs.

ISSN:0028-8306    

DOI:10.1080/00288306.1958.10422801

出版商:Taylor & Francis Group    

年代:1958

数据来源: Taylor