Effects of diffusion of water and migration of melts in crustal rocks: An experimental study

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F20%3A00000063" target="_blank" >RIV/00025798:_____/20:00000063 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11310/20:10424166

Result on the web

<a href="https://doi.org/10.1016/j.chemgeo.2020.119548" target="_blank" >https://doi.org/10.1016/j.chemgeo.2020.119548</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.chemgeo.2020.119548" target="_blank" >10.1016/j.chemgeo.2020.119548</a>

Result language

angličtina

Original language name

Effects of diffusion of water and migration of melts in crustal rocks: An experimental study

Original language description

Water and melts are crucial in controlling the chemistry, architecture, and dynamics of the Earth's crust.However, how water and melts influence chemical and textural changes of pervaded rocks during transport andhow they chemically react with surrounding minerals remain cryptic. We present experimental data illustratinghow water-undersaturated and potassium-rich melt in partially molten felsic granulite, or melt lost from suchgranulite affects the chemistry and texture of an initially, nearly anhydrous eclogite at high-pressure and hightemperature(1.2 GPa, 950 °C) for 20 h. The first experiment simulates interaction of eclogite with granulitehaving a small proportion of melt (melt = 2 volpercent, solids = 98 volpercent, with H2O = 0.4 wtpercent in the systemgranulite+melt, called in this paper granulite). The second experiment simulates interaction of eclogite withmelt (melt = 90 volpercent, solids = 10 volpercent, H2O = 4 wtpercent in the system granulite+melt, called in this papergranulite partial melt). Our results show that during granulite-eclogite interaction: i) the melt in the granulitecrystallises as a consequence of water diffusion into the eclogite; ii) this water causes partial replacement ofgarnet by plagioclase-orthopyroxene-magnetite-(±amphibole-) symplectite, whose volumetric proportioncorrelates with water content in the granulite; and iii) a small proportion of melt from the granulite (&#8804;2 volpercent)infiltrates into the eclogite, as documented by mineral overgrowths in granulite and by glass pools with increasedpotassium content in symplectites and along grain boundaries in the eclogite. Water and melt transferappears to be effective in causing textural changes, but appears to be ineffective in changing the bulk chemistryof the eclogite, even if local enrichment in potassium and water occurs. Such chemically stealthy diffusion ofwater and migration of limited amount of melt is able to cause major textural changes accompanied by localisedchemical changes at grain-scale that would not be otherwise observed at the scale of the bulk rock composition.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10505 - Geology

Project

<a href="/en/project/GA16-17457S" target="_blank" >GA16-17457S: Melting the metagranitoids: important but poorly understood aspect of crust evolution</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Chemical Geology

ISSN

0009-2541

e-ISSN

—

Volume of the periodical

540

Issue of the periodical within the volume

May : 119548

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

15

Pages from-to

nestránkováno

UT code for WoS article

000525365400002

EID of the result in the Scopus database

2-s2.0-85080046555