Mesozoic plutonic belts of southern Alaska

Hudson, Travis

doi:10.1130/0091-7613(1979)7<230:mpbosa>2.0.co;2

Cited by 49 publications

(43 citation statements)

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“…Chichagof belt v i a t h e Tonsina-Chichagof b e l t of Hudson (1979) i s n o t e s t a bl i s h e d . Reed and Ianphere (1973) concluded t h a t a magmatic arc w i t h northwardd i p p i n g p o l a r i t y was p r e s e n t , but Sudson (1979) suggested t h a t t h e evidence i s n o t s u f f i c i e n t .…”

Section: Jurassic Plutonism Of T H E Alaska-aleutian Range B a T H O mentioning

confidence: 96%

“…k t h and J. G. Smith, o r a l communications, 1978, 1 9 7 9 ) . Hudson's (1979) i n t e r p r e t a t i o n of Mesozoic p l u t o n i c belts of s o u t h e r n Alaska e x t e n d s somewhat i n t o s o u t h e a s t e r n Alaska: i n g e n e r a l , h i s and o u r i n t e r p r e t a t i o n s a r e c o m p a t i b l e i n t h e a r e a of o v e r l a p .…”

Section: P R O V I D E D T H E I N T R U S I V E Rock Map D I S R R Imentioning

confidence: 99%

“…Hudson (1979) d i d n o t include these racks i n h i s a n a l y s i s of Mesozoic p l u t o n i c b e l t s .…”

Section: The L I M I T E D a V A I L A B L E I S O T O P I C Evidencementioning

confidence: 99%

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Intrusive rocks and plutonic belts of southeastern Alaska, U.S.A.

Brew¹,

Morrell²

1980

Open-File Report

118

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Open-File Report 80-78 1980This r e p o r t i s p r e l i m i n a r y and has n o t been edited o r reviewed f o r conformity with Geological Survey standards and n o m e n c l a t u r e .NOW with Amax Exploration, Inc . , Denver, Colorado. ABSTRACT A v a i l a b l e i n f o r m a t i o n on t h e map d i s t r i b u t i o n , composition, and a g e s ofi n t r u s i v e r o c k s i n s o u t h e a s t e r n Alaska h a s been compiled and t h e r e s u l t s i n t e rp r e t e d t o i n d i c a t e t h e presence of s i x major and f i v e minor b e l t s . 2About 30 p e r c e n t of t h e 175,000 km of s o u t h e a s t e r n Alaska i s u n d e r l a i n by i n t r u s i v e igneous rocks. From west t o e a s t , t h e major b e l t s a r e : t h e F a i rweather-Baranof b e l t of e a r l y t o mid-Tertiary g r a n o d i o r i t e ; t h e Muir-Chichagof b e l t of mid-Cretaceous t o n a l i t e and g r a n o d i o r i t e ; t h e Admiralty-Revillagigedo p o r p h y r i t i c g r a n o d i o r i t e , q u a r t z d i o r i t e , and d i o r i t e b e l t of p r o b a b l e Cretaceous age; t h e Klukwan-Duke b e l t of c o n c e n t r i c a l l y zoned o r Alaskan-type ultramafic-mafic p l u t o n s of mid-Cretaceous age which i s mainly w i t h i n t h e Admiralty-Revillagigedo b e l t ; t h e Coast P l u t o n i c Complex t o n a l i t e s i l l of unknown, b u t perhaps mid-Cretaceous, age; and the Coast P l u t o n i c Complex b e l t I of e a r l y t o mid-Tertiary g r a n o d i o r i t e and q u a r t z monzonite.The minor b e l t s a r e d i s t r i b u t e d a s f o l l o w s : l a y e r e d gabbro complexes of i n f e r r e d mid-Tertiary a g e l i e w i t h i n and a r e probably p a r t of t h e FairweatherBaranof b e l t ; t h e Chilkat-Chichagof b e l t of J u r a s s i c g r a n o d i o r i t e and t o n a l i t e l i e s w i t h i n t h e Muir-Chichagof b e l t ; t h e S i t k o h Bay a l k a l i n e , Keadrick Bay pyrox e n i t e t o q u a r t z monzonite, and Annette and Cape Fox t r o n d h j e m i t e complexes, a l l i n t e r p r e t e d t o be of Ordovician ( ? ) a g e , form t h e c r u d e s o u t h e r n Southeast Alaska b e l t w i t h i n the Muir-Chichagof b e l t ; t h e Kuiu-Etolin v o l c a n i c -p l u t o n i c b e l t of mid-Tertiary a g e extends from t h e Muir-Chichagof b e l t eastward i n t o t h e Admiralty-R e v i l l a g i g e d o belt; and t h e B e h Canal b e l t of mid-t o l a t e T e r t i a r y g r a n i t e s l i e s w i t h i n and next t o t h e Coast P l u t o n i c Complex b e l t 11. I n a d d i t i o n , s c a t t e r e d maficu l t r a m a f i c b o d i e s occur w i t h i n t h e Fairweather-Baranof, Muir-Chichagof, and Coast P l u t o n i c Complex b e l t s . P a l i n s p a s t i c r e c o n s t r u c t i o n of 200-km r i g h t -l a t e r a l movement on t h e Chatham S t r a i t f a u l t does n o t s i g n i f i c a n t l y change t h e p a t t e r n of t h e major b e l t s , b u t does b r i n g mid-Tertiary v o l c a n i c -p l u t o n i c and Ord...

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Section: Jurassic Plutonism Of T H E Alaska-aleutian Range B a T H O mentioning

confidence: 96%

Section: P R O V I D E D T H E I N T R U S I V E Rock Map D I S R R Imentioning

confidence: 99%

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Intrusive rocks and plutonic belts of southeastern Alaska, U.S.A.

Brew¹,

Morrell²

1980

Open-File Report

118

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“…This belt includes some plutons east of Glacier Bay that were assigned to the Chilkat-Prince of Wales province by Sonnevil (1981). All of these late Early Cretaceous rocks were assigned to the Nutzotin-Chichagof belt by Hudson (1979Hudson ( , 1983. We have assigned or reassigned all of the plutons described in this report to the belts that are described here.…”

Section: Regional Magmatic Beltsmentioning

confidence: 97%

“…The rocks of the Wrangellia and Chugach terranes that occur in the TISZ as fault-bounded slivers were emplaced by strike-slip movements whose sense is uncertain. A Jurassic pluton in the TISZ could be related to a coeval body in the St. Elias Mountains to the north on the west side of the TISZ (Hudson, 1979), suggesting that the movement was right-lateral. The rocks in the TISZ were also deformed later by apparent right-lateral movements on the Border Ranges Fault, which forms the east boundary of the TISZ (Smart and others, 1996).…”

Section: Subregions and Tectonic Terranesmentioning

confidence: 99%

Geochronology of plutonic rocks and their tectonic terranes in Glacier Bay National Park and Preserve, southeast Alaska

Brew¹,

Tellier²,

Lanphere³

et al. 2014

Professional Paper

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COVERMount Fairweather (15,300 ft or 4,663 m) in the far distance beyond the peaks and glaciers that surround (and conceal) John Hopkins Inlet. The photo was taken from the complex metamorphosed Paleozoic rocks and Cretaceous plutons east of Reid Inlet looking across the Tarr Inlet suture zone and over the dominant metamorphosed Mesozoic rocks of the Fairweather Range. Mount Fairweather is underlain by layered gabbroic rocks of Tertiary age. Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner. Geochronology of Plutonic Rocks and their Tectonic Terranes in Glacier Bay AbstractWe have identified six major belts and two nonbelt occurrences of plutonic rocks in Glacier Bay National Park and Preserve and characterized them on the basis of geologic mapping, igneous petrology, geochemistry, and isotopic dating. The six plutonic belts and two other occurrences are, from oldest to youngest: (1)

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