#Sunday, Day 23 of #IStayHome.
Prompted by the tw of @BobGooday I decided to start a series of #rocksathome sideshows on crustal anatexis, melt inclusions and nanogranitoids, using El Hoyazo de Nijar (Spain) as a starting point. The 'garnet volcano' in fact is visited (read on)

... by hundreds of students but its geology isn't so well known. El Hoyazo is UNIQUE in the world for the understanding of crustal anatexis and origin of peraluminous melts, and was prophetically defined by Zeck (1970) as an "erupted migmatite"! Here the "caldera", actually a...

...reef-covered submarine dome. The dacitic lava, dated at 6.3 Ma, is unique for its abundance of crustal enclaves like this: Grt-Bt-Sil-Pl-Gr-melt±Crd±Spl is the main assemblage, and under the microscope these rocks are gorgeous (more tomorrow). Disruption of the enclaves is...

...responsible for the occurrence of abundant, euhedral garnets in the lavas. They are chemically and microstructurally the same as those in the enclaves, and are full of melt inclusions. Why melt inclusions in a metamorphic garnet? Wait tomorrow. But as mentioned by @BobGooday

... @tomargles the lava is known for its beautiful, fresh cordierite. There is a metamorphic, residual Crd (originates like Grt above) but also this lovely sector-trilled (Zeck, 1972) igneous one. The two cordierites differ in XMg. Tomorrow we'll look at the gorgeous enclaves.

well if you're interested and forgive some autoreferencing you can scroll down here https://www.researchgate.net/profile/Bernardo_Cesare/research starting with Cesare et al. (1997). Last on these rocks is Parisatto et al (2018)