Cooling and crystallization of komatiite flows.
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Cooling and crystallization of komatiite flows.

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Published by University of Ottawa in Ottawa .
Written in English

Subjects:

  • Geology - Ontario,
  • Komatiites,
  • Abitibi greenstone belt

Book details:

Classifications
LC ClassificationsQE 191 S559 1996 thesis
The Physical Object
Pagination211 p.
Number of Pages211
ID Numbers
Open LibraryOL22064652M

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The often rarely preserved flow top breccia and pillow margin zones in some komatiite flows are essentially volcanic glass, quenched in contact with overlying water or air. Because they are quenched, they represent the liquid composition of the komatiites, . of cooling and crystallization in an actively flowing komatiite lava. The present paper investigates the processes of cooling and crystallization in komatiite lavas after they come to rest. We consider the influence that convective motions, arising from cooling and crystallization within the magma after emplacement, might have on the. Cooling crystallization is more generally define as the formation of solid with desirable and consistent properties from a solution, where the solubility line is highly sensitive to decrease of temperature. It is widely used in pharmaceutical, petrochemical, semiconductor industry. Crystallization is often conducted in batches rather thanFile Size: KB. Komatiite Explained. Komatiite is a type of ultramafic mantle-derived volcanic rock defined as having crystallised from a lava with ≥ 18 wt% ites have low silicon, potassium and aluminium, and high to extremely high magnesium content. Komatiite was named for its type locality along the Komati River in South Africa, and frequently displays spinifex texture composed of large.

  Spinifex-textured komatiites at Honeymoon Well, Western Australia, show evidence of partial melting and recrystallization of original igneous textures. Their textures and mineral compositions differ markedly from those typical of komatiites. Spinifex olivine plates are bent and broken, while interstitial space between spinifex and cumulus olivine is occupied by polygonal aggregates of Cited by: When komatiite lavas are emplaced on the sea floor most of the heat transfer occurs through the upper lava-seawater boundary. We have investigated th We use cookies to enhance your experience on our continuing to use our website, you are agreeing to our use of by:   Stephen J. Barnes, Chromite in Komatiites, 1. Magmatic Controls on Crystallization and Composition, Journal of (Arndt, ), so for the probable conditions of komatiite crystallization, a line can be drawn which represents the Cr These are preserved in rapidly cooled thin flows, where cooling rates are too high to allow significant Cited by: Komatiite-associated Ni-Cu-PGE deposits: Geology, mineralogy, geochemistry and genesis Article (PDF Available) January with Reads How we measure 'reads'.

  However, this model cannot explain the occurrence of spinifex textute within thick komatiite flows well below the upper chilled crust. Large skeletal crystals may have crystallized at depths, many metres below the surfaces of the flows (Fig. 3) where cooling rates must have been low. Thicker flows cooled more slowly and developed peridotite--pyroxenite--gabbro cumulate successions by processes similar to those active in intrusive rocks. The Proterozoic layered flows of Cape Smith, Québec, crystallized from basaltic komatiite and magnesian basaltic by: 9. Diagram illustrating changes in cooling rate and thermal gradient during the crystallization of the upper part of a komatiite flow. In the calculation there was 50 C of undercooling at the time of Author: Francois Faure. Powder Technology –Ž. caterpowtec Continuous cooling crystallization from solution Hakan Gros˚¨a,), Teuvo Kilpio b, Juha Nurmi c a Cultor Food Science, Xyrofin DiÕision, KantÕik, Finland b Cultor Food Science Technology DeÕelopment, KantÕik, Finland c Cultor Food Science Technology DeÕelopment, KantÕik, Finland.