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Rock types native to a specific area
All of "Devonian and younger", "Silurian ", and "Ordovician " are country rock. The igneous intrusion leads to a volcanic eruption .
In geology , country rock is the rock native to an area, in contrast to any intrusion of viscous geologic material, commonly magma , or perhaps rock salt (in salt domes ) or unconsolidated sediments .[1]
A dike Baranof Island , Alaska , United States
Magma is typically less dense than the rock it intrudes, widening and filling existing cracks, sometimes melting the already-existing country rock.[2]
The term "country rock" is similar to, and in many cases interchangeable with, the terms basement and wall rocks .
Country rock can denote the widespread lithology of a region in relation to the rock which is being discussed or observed.
Geologic settings [ edit ]
Settings in geology when the term country rock is used include:
Igneous intrusions [ edit ]
When describing a pluton or dike , the igneous rock can be described as intruding the surrounding country rock , the rock into which the pluton has intruded.[3]
When country rock is intruded by a dike, perpendicular to the bedding plane , it is called discordant intrusion, while a parallel intrusion by a sill indicates a sub-parallel or concordant intrusion .[4] [5] [2] [6]
Most intrusions into country rock are via magma . Usually, country rock is intruded by an igneous body of rock which formed when magma forced upward through fractures , or melted through overlying rock . Magma then cooled into solid rock, different from the surrounding country rock. Sometimes, a fragment of country rock will break off and become incorporated into the intrusion, and is called a xenolith Greek , ξένος xenos , "strange,", and λίθος lithos , the ancient Greek word for "stone."[7]
The heat of the intrusions usually changes the country rock, often to contact metamorphic rock . Commonly, hornfels is produced, or skarn .[7]
Alluvial settings [ edit ]
When describing recent alluvium , the material that has arrived through volcanic , glacial or fluvial action can be described as a veneer on the (older) country rock.
References [ edit ]
^ Newfoundland and Labrador,
Glossary of Geological Terms Accessed June 2018.Patricia L. Barnes-Svarney; Thomas E. Svarney (2004). The Handy Geology Answer Book 113 –. ISBN 978-1-57859-156-5
^ "Hydraulic fracturing as a possible mechanism of dyke-sill transitions and horizontal discordant intrusions in trachytic tabular bodies of Arraial do Cabo, State of Rio de Janeiro, Brazil" . Geofísica Internacional. 2008. Retrieved 18 December 2018 .
^ Granyia (June 6, 2017). "BATHOLITH…, LOPOLITH…, SILL OR DIKE? – INTRUSIONS (2 )" . Volcano Hotspot. Retrieved 18 December 2018 .
^ Khoso, Sultan Ahmed. "Intrusive Igneous Rock Structures" (PDF) . miningstudents. Retrieved 22 December 2018 . [permanent dead link
^ a b "Country rock" . encyclopedia.com. Retrieved 15 December 2018 .
R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=Country_rock_(geology)&oldid=1165594602 " C a t e g o r y : ● R o c k s H i d d e n c a t e g o r i e s : ● A l l a r t i c l e s w i t h d e a d e x t e r n a l l i n k s ● A r t i c l e s w i t h d e a d e x t e r n a l l i n k s f r o m J u l y 2 0 2 0 ● A r t i c l e s w i t h p e r m a n e n t l y d e a d e x t e r n a l l i n k s ● A r t i c l e s w i t h s h o r t d e s c r i p t i o n ● S h o r t d e s c r i p t i o n i s d i f f e r e n t f r o m W i k i d a t a ● A r t i c l e s c o n t a i n i n g A n c i e n t G r e e k ( t o 1 4 5 3 ) - l a n g u a g e t e x t
● T h i s p a g e w a s l a s t e d i t e d o n 1 6 J u l y 2 0 2 3 , a t 0 5 : 1 2 ( U T C ) . ● T e x t i s a v a i l a b l e u n d e r t h e C r e a t i v e C o m m o n s A t t r i b u t i o n - S h a r e A l i k e L i c e n s e 4 . 0 ;
a d d i t i o n a l t e r m s m a y a p p l y . B y u s i n g t h i s s i t e , y o u a g r e e t o t h e T e r m s o f U s e a n d P r i v a c y P o l i c y . W i k i p e d i a ® i s a r e g i s t e r e d t r a d e m a r k o f t h e W i k i m e d i a F o u n d a t i o n , I n c . , a n o n - p r o f i t o r g a n i z a t i o n . ● P r i v a c y p o l i c y ● A b o u t W i k i p e d i a ● D i s c l a i m e r s ● C o n t a c t W i k i p e d i a ● C o d e o f C o n d u c t ● D e v e l o p e r s ● S t a t i s t i c s ● C o o k i e s t a t e m e n t ● M o b i l e v i e w
