Bahía Mansa Metamorphic Complex

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{{Infobox rockunit

| name = Bahía Mansa Metamorphic Complex

| age = Carboniferous, ~{{fossil range|330|385}}{{cite journal |last1=Hervé |last2=Calderon |last3=Fanning |last4=Pankhurst |last5=Fuentes |last6=Rapela |last7=Correa |last8=Quezada |last9=Marambio |display-authors=1 |date=9 March 2016 |title=Devonian magmatism in the accretionary complex of southern Chile |url=https://jgs.lyellcollection.org/content/173/4/587 |journal=Journal of the Geological Society |publisher=Geological Society of London |publication-place=London |volume=173 |issue=4 |pages=587–602 |doi=10.1144/jgs2015-163 |bibcode=2016JGSoc.173..587H |s2cid=21712605 |issn=0016-7649 |url-access=subscription |access-date=6 October 2021 |url-status=live |archive-url=https://web.archive.org/web/20170620022334/http://jgs.lyellcollection.org/content/173/4/587 |archive-date=20 June 2017}}

| period = Carboniferous

| type = Geological complex

| prilithology = Pelitic schist

| otherlithology = Blueschist, Greenschist, Slate

| namedfor = Bahía Mansa

| region = Los Ríos Region, Los Lagos Region

| country = Chile

| coordinates = {{Coord|-40.5|-73}}

| underlies = Mesozoic and Cenozoic sediments

| thickness = Thousands of meters

}}

The Bahía Mansa Metamorphic Complex (Spanish: Complejo Metamórfico Bahía Mansa, CMBM),{{cite journal |last1=Duhart |first1=Paul |last2=McDonough |first2=Michael |last3=Muñoz |first3=Jorge |last4=Martin |first4=Mark |last5=Villeneuve |first5=Michael |display-authors=1 |year=2001 |title=El Complejo Metamórfico Bahía Mansa en la cordillera de la Costa del centro-sur de Chile (39°30'-42°00'S): geocronología K-Ar, 40Ar/39Ar y U-Pb e implicancias en la evolución del margen sur-occidental de Gondwana |url=http://andeangeology.cl/index.php/revista1/article/view/V28n2-a03/html |url-status=live |journal=Andean Geology |language=Spanish |publisher=National Geology and Mining Service |publication-place=Santiago |volume=28 |issue=2 |pages=179–208 |doi=10.4067/S0716-02082001000200003 |issn=0716-0208 |archive-url=https://web.archive.org/web/20211006055422/http://andeangeology.cl/index.php/revista1/article/view/V28n2-a03/html |archive-date=6 October 2021 |access-date=6 October 2021 |doi-access=free}} also known as the Western Series,{{cite conference |last1=Kato |last2=Sharp |last3=Godoy |date=22-26 November 2009 |title=Devonian-Carboniferous retro-eclogite (blueschist) boulders from the Cordillera de la Costa accretionary complex (41°S), Chile: Tectonic similarities to high grade blueschists of the California Coast Ranges, USA |url=https://biblioteca.sernageomin.cl/opac/DataFiles/12993_v2_S8_018.pdf |conference=Congreso Geológico Chileno |location=Santiago |publisher=Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile |archive-url=https://web.archive.org/web/20211006054112/https://biblioteca.sernageomin.cl/opac/DataFiles/12993_v2_S8_018.pdf |archive-date=6 October 2021 |conference-url=https://congresogeologicochileno.cl |url-status=dead}} is a group of geologic formations in the Chilean Coast Range in southern Chile that have been transformed by heat and pressure (a process called metamorphism). It includes pelitic schists (layered rocks from mud or clay), metagreywackes (hardened sandy sediments altered by metamorphism), and mafic metavolcanics{{cite journal |last1=Duhart |first1=Paul |last2=Adriasola |first2=Alberto C. |date=January 2008 |title=New time-constraints on provenance, metamorphism and exhumation of the Bahía Mansa Metamorphic Complex on the Main Chiloé Island, south-central Chile |url=http://andeangeology.cl/index.php/revista1/article/view/V35n1-a04/html |url-status=live |journal=Andean Geology |publisher=National Geology and Mining Service |publication-place=Santiago |volume=35 |issue=1 |pages=79–104 |doi=10.5027/andgeoV35n1-a04 |issn=0716-0208 |archive-url=https://web.archive.org/web/20211006060416/http://andeangeology.cl/index.php/revista1/article/view/V35n1-a04/html |archive-date=6 October 2021 |access-date=6 October 2021 |doi-access=free}} (dark-colored rocks from ancient ocean floors). The complex is named after Bahía Mansa, a nearby coastal bay.