Contact metamorphic reactions and fluid–rock interactions related to magmatic sill intrusion in the Guaymas Basin

Abstract ∘ C km- 1 µ m sized pyrrhotite crystals, filling primary interstitial space, and partial dissolution of detrital feldspar grains. In the bottom contact aureole, quartz and euhedral pyrrhotite crystals occur, which are up to 4 times larger than those at the top contact. Significant metamorphism of sediments is observed in the lower contact aureole, where plagioclase recrystallizes around the detrital feldspars and locally euhedral pyroxenes are included in patches of carbonate cement; this suggests precipitation from carbon-rich fluids at temperatures (T ∘ C. The lower contact aureole also is more enriched in CaO, Na2 O, Fe2 O3 and trace elements (Cu, As, Zn, etc.) compared to the upper contact. Based on these petrological investigations, a conceptual model of magma–sediment–fluid interaction is proposed distinguishing top and bottom contact processes. Initial contact metamorphism due to sill emplacement is characterized by dehydration reactions in sediments and crystallization of new minerals. It was followed by carbonate precipitation from the released fluids. At a final stage, the temperature re-equilibrated with the geothermal gradient and the rocks were further altered by hydrothermal fluids.

Object Details

• Location: Deutsche Nationalbibliothek Frankfurt am Main
• Extent: Online-Ressource
• Language: Englisch

References and Relationships

• Bibliographic citation: Contact metamorphic reactions and fluid–rock interactions related to magmatic sill intrusion in the Guaymas Basin ; volume:35 ; number:6 ; year:2023 ; pages:987-1007 ; extent:21 ; European journal of mineralogy ; 35, Heft 6 (2023), 987-1007 (gesamt 21)

Contributors, Places and Time

• Creator: Cheviet, Alban ; Buatier, Martine ; Choulet, Flavien ; Galerne, Christophe ; Riboulleau, Armelle ; Aiello, Ivano ; Marsaglia, Kathleen M. ; Höfig, Tobias W.

Further information

• DOI: 10.5194/ejm-35-987-2023
• URN: urn:nbn:de:101:1-2023112303275971801171
• Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Last update: 15.08.2025, 7:29 AM CEST