Richterite-bearing peridotites and MARID-type inclusions in lavas from North Eastern Morocco: mineralogy and D/H isotopic studies

Article Abstract:

Late Cretaceous monchiquites and an olivine nephelinite from North Eastern Morocco contain K-richterite/phlogopite-bearing peridotite xenoliths and mica-amphibole-rutile-ilmenite-diopside (MARID) inclusions. The discovery suggests that conditions needed to produce these rocks are present in settings other than stable cratons. Similar chemical and hydrogen isotopic composition of K-richterite metasomatized peridotite and MARID minerals suggest a genetic link between the two xenoliths. Mixing mechanisms and the metasomatic processes are discussed.

Peridotite, Morocco, Metasomatism (Mineralogy), Metasomatism

---

Partial fusion of basic granulites at 5 to 15 kbar: implications for the origin of TTG magmas

Article Abstract:

The effects of partial fusion on basic granulites were analyzed to determine the role of magmatic underplating in the formation of the lower crust at active continental margins. Analysis of the basic granulites after partial fusion at five kilobars indicated the presence of plagioclase/pyroxene which predominated the melt composition of the crystalline residua. Furthermore, the effects of partial fusion on basic granulites indicated the role of partial melts in giving rise to tonalithic magmas at convergent plate edges.

Analysis, Geology, Structural, Structural geology, Magmatism, Magma

---

Constraints on the origin of alkaline and calc-alkaline magmas from the Tuxtla Volcanic Field, Veracruz, Mexico

Article Abstract:

Structural conditions in the crust affect the origin of alkaline and calc-alkaline magmas from the Tuxtla Volcanic Field (TVF), Veracruz, Mexico. Extensional environment may be responsible for the transport of alkaline, low volume, low degree partial melts to the surface. The magma formation occurs under different pressure and temperature conditions. An isotopic and trace element study can establish the conditions under which the magma formation occurs.

Veracruz, Mexico, Alkalic igneous rocks

Similar abstracts:

• Abstracts: Source characteristics of the basement rocks from the Sulu and Celebes Basins (Western Pacific): chemical and isotopic evidence
• Abstracts: Slab in the wrong place: lower lithospheric mantle delamination in the last stage of the Eastern Carpathian subduction retreat: comment and reply
• Abstracts: Effect of grossular on garnet-biotite, Fe-Mg exchange reactions: evidence from garnet with mixed growth and diffusion zoning
• Abstracts: Mineral inclusions in diamonds from the River Ranch kimberlite, Zimbabwe. Nd, Sr, Pb, Ar, and O isotopic systematics of Sturgeon Lake kimberlite, Saskatchewan, Canada: constraints on emplacement age, alteration, and source composition
• Abstracts: Linking extinction to connectivity and habitat destruction in metapopulation models

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.