摘要:

A Late Miocene to Pliocene/Lower Pleistocene sedimentary sequence is located 3–15 km west of the New Zealand Alpine Fault and north-west of Lewis Pass.Rappahannock Groupis non-marine, and formations are based on the pebble content of conglomerates which are interbedded with sandstones and carbonaceous siltstones. Evidence for the timing of transcurrent movement on the Alpine Fault is provided by provenance studies of pebbles in these conglomerates. The basalFrog Flat Formationand overlyingSpargo Formationcontain conglomerates with 58-87% arenite pebbles. These arenite pebbles are characterised mainly by a quartz modal count of generally < 10 and are thought to be of Caples/Pelorus origin. Pelorus rocks on the western side of the Alpine Fault, north of Rappahannock Group, are rejected as the arenite source area as there is no evidence of Pelorus pebble transportation south to the Rappahannock Group. The Caples terrane is a more probable source area and is thought to have been located across the Alpine Fault adjacent, and to the east of, the depositional basin during the Late Miocene. Approximately 420 km of subsequent dextral shift on the Alpine Fault has resulted in the locating of the Caples terrane in its present position in west Otago/Southland.

ISSN:0028-8306    

DOI:10.1080/00288306.1979.10424165

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

The Thomson Mountains west of Lake Wakatipu are underlain by sediments of the volcaniclastic Caples terrane, lying east of the Dun Mountain Ophiolite Belt and gradational into the western margin of the Haast Schist Zone. Although traditional formation-mapping methods are difficult to apply in the area, five formations have been differentiated. The Caples sediments can be divided into eight subordinate lithofacies.

ISSN:0028-8306    

DOI:10.1080/00288306.1979.10424166

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

The geology and mineralogy of the Puramahoi kaolin deposits near Takaka, North-west Nelson, New Zealand, are described. The deposits form seams up to one metre thick in the deeply weathered Motupipi Coal Measures of Early Tertiary (Eocene) age. Examinations by XRD, IR, DTA, and EM show that the clay is composed largely of kaolinite and quartz with minor amounts of secondary 2M1mica, goethite, lepidocrocite, pyrite, and carbonaceous and amorphous siliceous material. Results show that the clay minerals are largely detrital although some authigenic kaolinite is present. Only two of the clay seams sampled are suitable for high quality ceramic ware. The presence of impurities restricts the use of the remainder unless treatment is carried out. Ellipsoidal pyrite nodules within the clay were also examined.

ISSN:0028-8306    

DOI:10.1080/00288306.1979.10424167

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Pollen analysis of two radiocarbon-dated sequences in Pauatahanui Basin, on the west coast of southern North Island, shows that for the last 8000 years or more aDacrydium cupressinum-dominant broadleaf-podocarp forest existed in the area. During this periodD. cupressinumhas slowly declined in favour ofPodocarpus, Noihofagus “fusca”beech, andMetrosideros. Ascarina lucidaalso slowly declined. This suggests a slow deterioration of the climate, particularly from about 5000 years ago, probably due to increased frostiness and summer droughts.

ISSN:0028-8306    

DOI:10.1080/00288306.1979.10424168

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Foraminiferal assemblages from 8 samples of Kahuitara Tuff on Pitt Island, Chatham Islands, contain at least 28 genera and 34 species.Anomalinoides chathamensis and Discorbis perditusare described as new species.

ISSN:0028-8306    

DOI:10.1080/00288306.1979.10424169

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Two limestone samples, collected from small outcrops on Chatham and Pitt Islands, contain late Haumurian foraminifera and calcareous nannofossils, and constitute the first record of uppermost Cretaceous strata from Chatham Islands or elsewhere on Chatham Rise.

ISSN:0028-8306    

DOI:10.1080/00288306.1979.10424170

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

The Carnian bivalveOretia coxiMarwick is re-examined, and observations are added to the original description of the right ear, hinge, byssal notch, and musculature. It is shown that the left valve also has a small ear. The genus is tentatively placed in the family Pergamidiidae Cox, and compared with smooth Monotidae Fischer and with members of the Mysidiellidae Cox.

ISSN:0028-8306    

DOI:10.1080/00288306.1979.10424171

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Brown vuagnatite (CaAlSiO4(OH)) is reported from a vein cutting a rodingite dike in the Livingstone Mountains, Southland. Microprobe analyses indicate that the colouring is due to small amounts of Fe and Ti in the mineral. Colourless vuagnatite occurs as a rock-forming mineral in a Maori artifact from Pounawea, South Otago. Vuagnatite may occur widely in prehnite-hydrogrossular assemblages.

ISSN:0028-8306    

DOI:10.1080/00288306.1979.10424172

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor