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Origin of Potassium-rich Silica-deficient Igneous Rocks

Part of the Springer Geology Book Series

DOI: 10.1007/978-81-322-2083-1

ISBN: 978-81-322-2082-4

Publisher: Springer India - Springer Journals

Jul 31, 2014

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Chapter 11Phase Relations in the System Leucite-Akermanite-Albite-SiO2

Gupta, Alok Krishna

Pages: 337 –350

[In certain ultrapotassic petrographic provinces such as Somma-Vesuvius (Savelli, 1967, Cioni et al. 1995), Coli-Albani (Aurisicchio et al., 1988) and Vico, all localities from Italy (Cundari and Mattias, 1974), Bufumbira region of East AfricaBufumbira, East Africa (Holmes and Harwood, 1937;...
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Chapter 12P-T Stability of Phlogopite, K-Richterite and Phengite, as a Source of Potassium in the Mantle

Gupta, Alok Krishna

Pages: 351 –379

[The forsterite–kalsilite-SiO2–H2O plane lying in this system has significant bearing in the genesis of various potassium-rich igneous rock types. This plane has therefore, been the subject of numerous studies under variable P-T conditions in the presence or absence of a fluid component belonging...
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Chapter 13Experimental Studies on K-Rich Rocks

Gupta, Alok Krishna

Pages: 381 –420

[Experimental studiesMadupiteexperimental studies on potassic rocks from LeuciteSouth Table Mountainleucite chemistryHillsLeucite Hills Type lamproite Wyoming, U.S.A. by different investigators are summarized in Table 13.1.Table 13.1One Atmosphere MadupiteMelting StudiesMelting Studies on...
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Chapter 14Structural and Tectonic Evolution of K-Rich Silica-Deficient Volcanic Provinces of Different Continents

Gupta, Alok Krishna

Pages: 421 –451

[Genesis of an ultrapotassic magma in the central part of east Africa (RuwenzoriRuwenzoriand BirungaBushwaga, Birunga volcanic province), the Rhine Graben region of Germany, Damodar ValleyDamodar Valley Coal Field (east India) and Rio Grande region of the USA is considered to have been associated...
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Chapter 15Genesis of Ultrapotassic Rocks

Gupta, Alok Krishna

Pages: 453 –474

[Different hypotheses, invoked during the first half of the last century, involved, (1) assimilation between different magma types and rocks (Daly 1910, 1933; Shand 1931), (2) Subtraction of Eclogite from a Picrite or Peridotite Magma (Holmes 1932; O’Hara and Yoder 1967), (3) gaseous transport...
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Chapter 16Petrologic Conclusions

Gupta, Alok Krishna

Pages: 475 –478

[Silica-deficient potassic rocks are characterized by high K2O content (>3), high K2O/Na2O ratio (>1) and low Si2O/K2O ratio (<15). They have high LREE concentration, sometimes 1,000–1,400 higher than that of chondrites. The LILE/HREE ratios are usually low, but 87Sr/86Sr ratios are usually high...

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