TY - CHAP

T1 - High-Pressure Na-Ca Carbonates in the Deep Carbon Cycle

AU - Rashchenko, Sergey

AU - Shatskiy, Anton

AU - Litasov, Konstantin

N1 - Funding Information: The work was supported by the Russian Science Foundation (No 14‐17‐00609‐P) and performed under the Deep Carbon Observatory program. Publisher Copyright: © 2020 The Authors. Co-published 2020 by the American Geophysical Union and John Wiley and Sons, Inc.

PY - 2020/3/24

Y1 - 2020/3/24

N2 - Carbonates play a central role in the subduction transport of oxidized carbon from Earth's surface to the deep mantle. The melting of carbonated rocks also leads to the release of carbonate melts, regarded as important oxidizing and metasomatizing agents, from the subducting slab. Although at upper mantle conditions the chemistry of carbonates within the subducting slab is restricted to the thoroughly studied ternary CaCO3-MgCO3-FeCO3 system, recent experimental and natural evidences strongly suggest that at conditions of the mantle transition zone, Na-Ca carbonates become the main host of oxidized carbon and define solidus -temperatures and chemistry of deep melts. In this chapter, we discuss transport of carbonates to the mantle transition zone within the subducting slab, evidences of sodium migration from silicates into carbonates under high pressure, and crystal chemistry of currently known high-pressure Na-Ca carbonates.

AB - Carbonates play a central role in the subduction transport of oxidized carbon from Earth's surface to the deep mantle. The melting of carbonated rocks also leads to the release of carbonate melts, regarded as important oxidizing and metasomatizing agents, from the subducting slab. Although at upper mantle conditions the chemistry of carbonates within the subducting slab is restricted to the thoroughly studied ternary CaCO3-MgCO3-FeCO3 system, recent experimental and natural evidences strongly suggest that at conditions of the mantle transition zone, Na-Ca carbonates become the main host of oxidized carbon and define solidus -temperatures and chemistry of deep melts. In this chapter, we discuss transport of carbonates to the mantle transition zone within the subducting slab, evidences of sodium migration from silicates into carbonates under high pressure, and crystal chemistry of currently known high-pressure Na-Ca carbonates.

KW - ARAGONITE PLUS MAGNESITE

KW - SYSTEM NA2CO3-CACO3

KW - CRYSTAL-STRUCTURE

KW - PHASE-RELATIONS

KW - DOLOMITE

KW - MANTLE

KW - NYEREREITE

KW - GPA

UR - http://www.scopus.com/inward/record.url?scp=85104325403&partnerID=8YFLogxK

U2 - 10.1002/9781119508229.ch13

DO - 10.1002/9781119508229.ch13

M3 - Article in an anthology

SN - 978-1-119-50826-7

VL - 249

T3 - Geophysical Monograph Series

SP - 127

EP - 136

BT - CARBON IN EARTH'S INTERIOR

A2 - Manning, CE

A2 - Lin, JF

A2 - Mao, WL

PB - AMER GEOPHYSICAL UNION

ER -