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What are the minerals and textures observed in subduction-related rocks? Examples from Jenner Beach, CA Franciscan Complex.

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Presentation on theme: "What are the minerals and textures observed in subduction-related rocks? Examples from Jenner Beach, CA Franciscan Complex."— Presentation transcript:

1 What are the minerals and textures observed in subduction-related rocks? Examples from Jenner Beach, CA Franciscan Complex

2 after Catlos and Sorensen, 2003 Late Jurassic-early Cretaceous age peak P ~ 0.9-1.2 GPa peak T ~ 500-700°C Case Study: Franciscan Complex

3 Jenner Beach – Mélange blocks eroded from the nearby hillsides Geologists from around the world flock to Jenner Beach. Image Courtesy of Sarah Penniston-Dorland

4 Blueschist PPL GAR AMPH PHE PHE=Phengite, GAR=Garnet, AMPH=Amphibole Image Courtesy of Sarah Penniston-Dorland

5 Blueschist XPL GAR AMPH PHE Image Courtesy of Sarah Penniston-Dorland

6 Blueschist PPL PHE=Phengite, GAR=Garnet, AMPH=Amphibole GAR AMPH PHE Image Courtesy of Sarah Penniston-Dorland

7 Blueschist XPL AMPH PHE GAR Image Courtesy of Sarah Penniston-Dorland

8 Eclogite PPL GAR AMPH PHE CHL OMPH CHL=Chlorite, OMPH=Omphacite Image Courtesy of Sarah Penniston-Dorland

9 Eclogite XPL CHL=Chlorite, OMPH=Omphacite GAR AMPH PHE CHL OMPH Image Courtesy of Sarah Penniston-Dorland

10 Eclogite PPL TTN=Titanite, EPI=Epidote TTN EPI Image Courtesy of Sarah Penniston-Dorland

11 Eclogite XPL TTN EPI TTN=Titanite, EPI=Epidote Image Courtesy of Sarah Penniston-Dorland


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