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{{Short description|Metamorphic unit in New Zealand}}
{{Infobox rockunit
| name           = Haast Schist
| image          = Textural zone 4 quartzofeldspathic schist, containing biotite.jpg
| caption        = Sample of Haast Schist, containing [[biotite]]
| type           = [[Metamorphic rock|Metamorphic]]
| age            = [[Carboniferous]]-[[Jurassic]]<br />~{{fossil range|320|180}}<!--rough range to display, needs to be refined-->
| period         = Mesozoic
| prilithology   = [[Schist]]
| otherlithology = [[Greenschist]], [[jade]]
| namedfor       = [[Haast Pass]]
| namedby        =
| region         = [[Canterbury, New Zealand|Canterbury]], [[Marlborough Region|Marlborough]] & [[Otago Region]]s<br />[[Chatham Islands]]
| country        = New Zealand
| coordinates    =
| unitof         = [[Stratigraphy of New Zealand#Basement rocks (Austral Superprovince)|Austral Superprovince]]
| subunits       = Otago & Alpine Schist
| underlies      = <!-- Needs to be added -->
| overlies       = 
| thickness      =
| extent         =
| area           =
| map            =
| map_caption    =
}}

The '''Haast Schist''', which contains both the Alpine and Otago Schist, is a metamorphic unit in the [[South Island]] of New Zealand. It extends from Central Otago, along the eastern side of the [[Alpine Fault]] to [[Cook Strait]].<ref>{{cite web |url= https://www.geotrips.org.nz/downloads/Ballance_NZ_Geology-V2.pdf |title= New Zealand Geology: an illustrated guide |website= www.geotrips.org.nz}}</ref> There are also isolated outcrops of the Haast Schist within the central North Island. The schists were named after Haast Pass on the [[West Coast, New Zealand|West Coast]]. The Haast Schist can be divided geographically from north to south into the Kaimanawa, Terawhiti, Marlborough, Alpine, Otago and Chatham schist.<ref name="MortimerRattenbury2014">{{cite journal|last1=Mortimer|first1=N|last2=Rattenbury|first2=MS|last3=King|first3=PR|last4=Bland|first4=KJ|last5=Barrell|first5=DJA|last6=Bache|first6=F|last7=Begg|first7=JG|last8=Campbell|first8=HJ|last9=Cox|first9=SC|last10=Crampton|first10=JS|last11=Edbrooke|first11=SW|last12=Forsyth|first12=PJ|last13=Johnston|first13=MR|last14=Jongens|first14=R|last15=Lee|first15=JM|last16=Leonard|first16=GS|last17=Raine|first17=JI|last18=Skinner|first18=DNB|last19=Timm|first19=C|last20=Townsend|first20=DB|last21=Tulloch|first21=AJ|last22=Turnbull|first22=IM|last23=Turnbull|first23=RE|title=High-level stratigraphic scheme for New Zealand rocks|journal=New Zealand Journal of Geology and Geophysics|volume=57|issue=4|year=2014|pages=402–419|issn=0028-8306|doi=10.1080/00288306.2014.946062|doi-access=free|bibcode=2014NZJGG..57..402M}}</ref>

== Description ==
The [[metamorphic grade]] progresses from [[greenschist]], [[biotite]], [[garnet]] and finally [[orthoclase]]. [[Myrmekite|Myrmekitic]] textures occur within [[oligoclase]] within the garnet zone.<ref>{{cite journal|author=Cooper, A. F.|title=Progressive Metamorphism of Metabasic Rocks from the Haast Schist Group of Southern New Zealand|journal=[[Journal of Petrology]]|volume=13|number=3|pages=457–492|year=1972|doi=10.1093/petrology/13.3.457|bibcode=1972JPet...13..457C}}</ref> The schist's protoliths were the greywacke and [[argillite]] of the Caples Terrane and [[Torlesse Composite Terrane]]. The schists were originally brought to the surface of the Earth's crust in the Cretaceous and again during the [[Kaikoura Orogeny]] along the Alpine Fault. [[Pounamu]] ([[Jade]]) is found as isolated pods in the higher metamorphic grades near the Alpine Fault.<ref name="CooperIreland2015">{{cite journal|last1=Cooper|first1=Alan F.|last2=Ireland|first2=Trevor R.|title=The Pounamu terrane, a new Cretaceous exotic terrane within the Alpine Schist, New Zealand; tectonically emplaced, deformed and metamorphosed during collision of the LIP Hikurangi Plateau with Zealandia|journal=Gondwana Research|volume=27|issue=3|year=2015|pages=1255–1269|issn=1342-937X|doi=10.1016/j.gr.2013.11.011|bibcode=2015GondR..27.1255C}}</ref>

== See also ==
{{Portal|Geology|New Zealand}}
* [[Geology of Canterbury, New Zealand]]
* [[Stratigraphy of New Zealand]]

== References ==
{{Reflist}}

== Further reading ==
* The Rise and Fall of the Southern Alps, G. Coates 2002

[[Category:Geologic formations of New Zealand]]
[[Category:Paleozoic Oceania]]
[[Category:Permian Oceania]]
[[Category:Triassic Oceania]]
[[Category:Jurassic System of Oceania]]
[[Category:Schist formations]]
[[Category:Geography of the Canterbury Region]]
[[Category:Geography of the Marlborough District]]
[[Category:Geography of Otago]]
[[Category:Geography of the Chatham Islands]]

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