By H. Wänke, G. Dreibus, E. Jagoutz (auth.), Professor A. Kröner, Professor G. N. Hanson, Professor A. M. Goodwin (eds.)

Archaean Geochemistry 1972 - 1984 The realisation that the continental crust comprises well-preserved relics which date way back to 4/5 of the Earth's age has given a good impetus to the research of early Precambrian terrains. As past due because the mid-sixties the Archaean nonetheless constituted the 'terra-in­ cognita' of earth technology. excessive metamorphic grades, negative out­ crop, and never least a largely assumed obliteration of early crustal files by means of convective recycling and thermal remodeling had com­ bined to deter examine during this box. many glorious neighborhood experiences existed, significantly round gold mining centres, yet remained unrelated to a broader nearby and theoretical realizing. this example has replaced because the outcome of 2 inter-related elements: (1) advances in isotopic tools and their program to Precambrian rocks, and (2) the popularity that a number of the oldest terrains have retained a wealth of fundamental igneous and sedi­ mentary textures or even geochemical characteristics.

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Jagoutz: Mantle Chemistry and Accretion of the Earth Wetherill GW (1978) Accumulation of the terrestrial planets. In: Gehrels T (ed) Protostars and planets, University Arizona Press, Tucson, Arizona, p 565 Williams DL, Von Herzen RP (1974) Heat loss from the Earth: New estimate. Geology (Boulder) 2:327 -328 Zartman RE, Tera F (1973) Lead concentration and isotopic composition in five peridotite inclusions of probable mantle origin. Earth Planet Sci Lett 20:54 - 66 Zindler A, Jagoutz E, Goldstein S (1982) Nd, Sr and Pb isotopic systematics in a three-component mantle: A new perspective.

The early history of the Earth's mantle was complicated by several processes such as heterogeneous accretion of the Earth from meteoritic material, mantlecore differentiation, extensive partial melting, intra-mantle mineralogical and chemical differentiation, formation of the protocrust, recycling of crustal material back into the mantle and continuous influx of meteoritic material before and after core formation. These processes are likely to have produced considerable long term and short term mineralogical and chemical heterogeneities in the preArchaean mantle.

1 Introduction Chemical and isotopic studies of Archaean mafic and ultramafic volcanic rocks are relevant to a number of important questions including: 1. 2. 3. 4. the composition of the bulk Earth, core and the primitive mantle; the chemical effect of core-mantle differentiation; the early history of the actively evolving mantle-crust system; the chemical effect of meteorite bombardment events in the early history of the Earth; 5. chemical and isotopic heterogeneities in the Archaean mantle; 6.

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