Schist structure east of the Alpine Fault bends, southeast Nelson, New Zealand

Turnbull, I. M.; Forsyth, P. Jane

doi:10.1080/00288306.1986.10427533

Cited by 5 publications

(4 citation statements)

References 13 publications

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“…Recent studies of the Haast Schist (e.g., Turnbull & Forsyth 1986;Findlay 1987;Mortimer 1993a;Begg & Mazengarb 1996;Bishop & Turnbull 1996) have drawn attention to some difficulties with the Bishop system, and these have been briefly discussed by Craw et al ( 1987) and Norris & Turnbull (1996). The current revision of the New Zealand 1:250 000 geological map series (QMAP) has shown that, over large areas, the textural zone system based on existing definitions can no longer be applied consistently, especially at higher textural grades.…”

Section: Purpose and Methodsmentioning

confidence: 99%

“…Several studies of areas within the Haast Schist show the presence of overprinted deformational-metamorphic fabrics. Primary structures (e.g., bedding) become obliterated as they are flattened and transposed by first-generation folding, accompanied by cleavage and Sj foliation development (e.g., Andrews et al 1974;Norris & Cooper 1977;Turnbull & Forsyth 1986;Findlay 1987). Mortimer (1993b) outlined areas on the flanks of the Otago Schist where first-generation Di structures dominate in outcrop (transposition zone I; Fig.…”

Section: Multiple Deformationsmentioning

confidence: 99%

“…2E) (Mortimer 2000). In an example from the Alpine Schist, an Si foliation is superimposed on existing Si fabrics, and itself has a textural fabric which appears similar to that which it replaces (Turnbull & Forsyth 1986). In such overprinting situations, two textural grades would ideally be recorded, but in practice, the overprinting S2 fabric usually developed parallel to and enhanced Sj; it is not possible to differentiate them, and only a pervasive foliation (S p ) can be mapped (e.g., Craw 1984).…”

Section: Multiple Deformationsmentioning

confidence: 99%

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Textural zones in the Haast Schist—a reappraisal

Turnbull

Mortimer

Craw

2001

New Zealand Journal of Geology and Geophysics

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Field subdivision of schist using textural appearance is valuable as a means to readily identify postmetamorphic faults and to subdivide monotonous schist, at 1:50 000 scale or smaller. Recent regional mapping in the Haast Schist of South Island, New Zealand, has revealed ambiguities and shortcomings in the existing field-based systems of textural subdivision. We propose a revised textural zonation scheme that is broadly compatible with the previous Hutton-Turner and Bishop systems, yet overcomes their deficiencies. The main criteria for identifying textural zones (TZ) are white mica grain size and foliation development. For field use, the main features are: (1) restriction to first generation penetrative textures and fabrics; (2) clarification of the definition and usage of segregation to better distinguish TZIIB from III schist; and(3) grouping of TZIIIB and IV rocks because of problems of protolith identification and quartz veining. The revised system is applicable to both sandstone and mudstone protoliths.

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Section: Purpose and Methodsmentioning

confidence: 99%

Section: Multiple Deformationsmentioning

confidence: 99%

Section: Multiple Deformationsmentioning

confidence: 99%

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Textural zones in the Haast Schist—a reappraisal

Turnbull

Mortimer

Craw

2001

New Zealand Journal of Geology and Geophysics

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“…In the Alpine Schist there was actual growth of new prograde mineral assemblages (biotite2, almandine and oligoclase) with the biotite2 isograd (~isotherm) rising in the crustal section relative to the biotite1 isograd and to other markers (e.g. isotects, Turnbull and Forsyth 1986). Biotite2 porphyroblasts commonly overprint a previous foliation (e.g.…”

Section: Alpine Schist Recrystallisationmentioning

confidence: 99%

Metamorphic discontinuities in orogenic belts: example of the garnet-biotite-albite zone in the Otago Schist, New Zealand

Mortimer¹

2000

International Journal of Earth Sciences

133

116

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A regional petrographic reconnaissance of psammitic and pelitic rocks in the Otago Schist, New Zealand, has revealed the presence of garnet (ªgros-salspiteº with typical rim composition almandine 41 , spessartine 25 , grossular 33 , pyrope 1 ) and biotite in 37 new samples, more than doubling the previously known number. A new garnet±biotite±albite zone can now be defined in the greenschist facies Otago Schist that is distinct from the better-known biotite, garnet and oligoclase zones in the along-strike Alpine Schist. The garnet±biotite±albite zone is in part metamorphically discontinuous with adjacent schists and does not support models of simple, continuous, progressive Jurassic regional metamorphism in Otago. The structurally higher (lower grade) boundary of the zone coincides in at least three places with previously mapped regional shear zones. The structurally lower (expected higher grade) boundary of the zone appears to be obliterated by a chlorite zone overprint which can be spatially related to Alpine Schist recrystallisation of ?Cretaceous age. The Otago situation serves as an example of the subtle metamorphic discontinuities that probably pervade many orogenic belts.

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South Island, New Zealand, and transverse ranges, California: A seismotectonic comparison

Yeats¹,

Berryman²

1987

Tectonics

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Both the South Island of New Zealand and the Transverse Ranges of California have (1) a major right‐slip fault marking the plate boundary, (2) a left‐stepping bend in the fault resulting in ranges and basins bounded by active reverse faults that strike 45° counterclockwise to the regional strike of the main fault, (3) a set of right‐slip faults on one side of the constraining bend, with most of the total displacement concentrated On the fault stepped farthest left from the continuation of the fault on the other side of the bend, and (4) intersections between the set of faults and the main fault within the bend not present or poorly defined. The faults with most of the displacement (Alpine‐Wairau, San Andreas) may pre‐date the constraining bend, The reverse fault province southeast of the Alpine fault is separated from that fault by the Southern Alps, which may be underlain by crust that is too hot and too weak to sustain major reverse faults. Average reverse fault recurrence intervals in New Zealand and California are 10³ to 2 × 104 years as compared to less than 10³ years for the right‐slip master fault, Seismicity is high but patchy in the Nelson‐Buller region of the northern South Island, low but patchy in the Transverse Ranges, and very low in Central Otago in the southern South Island, all reverse fault provinces. Seismicity patterns in both regions, poorly related to overall late Quaternary fault distribution, correspond largely to individual rupture events on portions of Quaternary faults, and the seismic inactivity of many of these faults may simply represent quiescence between seismic faulting with long recurrence intervals. The geology and Seismicity of the three reverse‐fault provinces support the suggestion of C. R. Allen [1975] that late Quaternary fault history is a better long‐term guide for assessment of large‐magnitude earthquake hazard than instrumental and historical Seismicity for faults with long recurrence intervals.

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Schist structure east of the Alpine Fault bends, southeast Nelson, New Zealand

Cited by 5 publications

References 13 publications

Textural zones in the Haast Schist—a reappraisal

Textural zones in the Haast Schist—a reappraisal

Metamorphic discontinuities in orogenic belts: example of the garnet-biotite-albite zone in the Otago Schist, New Zealand

South Island, New Zealand, and transverse ranges, California: A seismotectonic comparison

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