'Alkaline series' presentation slideshows

Partial melting

Partial melting. 1. Binary and ternary phase diagrams; melting of the mantle. 1 - C Systems. The system SiO 2. After Swamy and Saxena (1994) , J. Geophys. Res., 99 , 11,787-11,794 . AGU. 1900. 1890. Liquid. a. 1700. b. c. Olivine. T o C. plus. Liquid. d. 1500. Olivine. 1300.

993 views • 62 slides

Intraplate magmatism

Intraplate magmatism. Hotspots Rift zones (often associated with hotspots) Intra-oceanic plate: Tholeitic to alkaline series; mostly basalts ( OIB = Oceanic Islands Basalts), some differenciated alkaline terms Intra-continental plate:

678 views • 32 slides

Intraplate magmatism

Intraplate magmatism. Hotspots Rift zones (often associated with hotspots) Intra-oceanic plate: Tholeitic to alkaline series; mostly basalts ( OIB = Oceanic Islands Basalts), some differenciated alkaline terms Intra-continental plate:

432 views • 32 slides

Alk vs. Calc-alk.: general appearance

447 views • 29 slides

Chapter 19: Continental Alkaline Magmatism

Chapter 19: Continental Alkaline Magmatism. Ol Doinyo Lengai volcano. Alkaline rocks generally have more alkalis than can be accommodated by feldspars alone. The excess alkalis appear in feldspathoids , sodic pyroxenes and amphiboles, or other alkali-rich phases

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AFM Diagram goes here

petrology. Tholeiitic series: Mg-rich olivine, followed by pyroxene, steers the crystallization path. Calc -alkaline series: addition of magnetite balances Fe/Mg ratios to produce a straight crystallization path towards alkalis. K 2 O. AFM Diagram goes here.

266 views • 11 slides