The structure of the lower Mesozoic rocks in the Porirua district

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The well indurated greywacke-argillite rocks of the Porirua district have been subjected to strong folding followed by more than one period of intense faulting and fracturing. The main axis of flexural folding trends NNE-NE and plunges 14° to 17° NE. Numerous small-scale fold; are described. They exhibit a wide range of forms: From open, symmetrical, and faulted fold; to isoclinal folds. A few localized folds, described as incongruous, have axes that cut across the NNE-NE trending regional fold axis. Faults are classified, on the basis of certain field criteria, into two broad age groups, early and late. The early faults include those associated with folding and those formed during subsequent episodes of faulting. Late faults comprise those that have been active during and possibly somewhat prior to the Quaternary.

LanguageEnglish
Pages528-540
Number of pages13
JournalNew Zealand Journal of Geology and Geophysics
Volume2
Issue number3
DOIs
Publication statusPublished - 1959
Externally publishedYes

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folding
rocks
fold
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argillite
graywacke
trends

Cite this

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title = "The structure of the lower Mesozoic rocks in the Porirua district",
abstract = "The well indurated greywacke-argillite rocks of the Porirua district have been subjected to strong folding followed by more than one period of intense faulting and fracturing. The main axis of flexural folding trends NNE-NE and plunges 14° to 17° NE. Numerous small-scale fold; are described. They exhibit a wide range of forms: From open, symmetrical, and faulted fold; to isoclinal folds. A few localized folds, described as incongruous, have axes that cut across the NNE-NE trending regional fold axis. Faults are classified, on the basis of certain field criteria, into two broad age groups, early and late. The early faults include those associated with folding and those formed during subsequent episodes of faulting. Late faults comprise those that have been active during and possibly somewhat prior to the Quaternary.",
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The structure of the lower Mesozoic rocks in the Porirua district. / Webby, B. D.

In: New Zealand Journal of Geology and Geophysics, Vol. 2, No. 3, 1959, p. 528-540.

Research output: Contribution to journalArticleResearchpeer-review

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