『Abstract
There is increasing evidence that many carbonatites are linked
both spatially and temporally with large igneous provinces (LIPs),
i.e. high volume, short duration, intraplate-type, magmatic events
consisting mainly of flood basalts and their plumbing systems
(of dykes, sills and layered intrusions). Examples of LIP-carbonatite
associations include: i. the 66 Ma Deccan flood basalt province
associated with the Amba Dongar, Sarnu-Dandali (Barmer), and Mundwara
carbonatites and associated alkali rocks, ii. the 130 Ma Parana(最後のaの頭に´)-Etendeka (e.g. Jacupiranga, Messum);
iii. the 250 Ma Siberian LIP that includes a major alkaline province,
Maimecha-Kotui with numerous carbonatites, iv. the ca. 370 Ma
Kola Alkaline Province coeval with basaltic magmatism widespread
in parts of the East European craton, and v. the 615-555 Ma CIMP
(Central Iapetus Magmatic Province) of eastern Laurentia and western
Baltica. In the Superior craton, Canada, a number of carbonatites
are associated with the 1114-1085 Ma Keweenawan LIP and some are
coeval with the pan-Superior 1880 Ma mafic-ultramafic magmatism.
In addition, the Phalaborwa and Shiel carbonatites are associated
with the 2055 Ma Bushveld event of the Kaapvaal craton. The frequency
of this LIP-carbonatite association suggests that LIPs and carbonatites
might be considered as different evolutionary ‘pathways’ in a
single magmatic process/system. The isotopic mantle components
FOZO, HIMU, EM1 but not DMM, along with primitive noble gas signatures
in some carbonatites, suggest a sub-lithospheric mantle source
for carbonatites, consistent with a plume/asthenospheric upwelling
origin proposed for many LIPs.』
Introduction
Large igneous provinces (LIPS)
Carbonatites
LIP-carbonatite associations
Afar and East Africa LIP (45-0 Ma)
Deccan LIP (65 Ma)
Parana(最後のaの頭に´)-Etendeka LIP (ca. 133 Ma)
Siberian traps LIP (250 Ma)
East European craton event(s) and associated Kola Alkaline Province
(ca. 380 Ma)
Central Iapetus magmatic province (615-550 Ma)
Keweenawan LIP (1115-1085 Ma)
Pan-superior LIP (ca. 1880-1870 Ma)
Bushveld LIP (ca. 2060 Ma)
Implications of an integrated analysis of LIPs and carbonatites
Identifying translithospheric faults
Regional and temporal distribution if LIPs and carbonatites in
a mantle plume context
Timing of carbonatites with respect to LIP magmatism
Integrated isotopic comparison of flood basalts and carbonatites
Conclusions
Acknowledgements
References