META-IGNEOUS ORIGIN OF HERCYNIAN PERALUMINOUS GRANITES IN NW FRENCH MASSIF CENTRAL - IMPLICATIONS FOR CRUSTAL HISTORY RECONSTRUCTIONS

被引:126
作者
TURPIN, L
CUNEY, M
FRIEDRICH, M
BOUCHEZ, JL
AUBERTIN, M
机构
[1] CNRS,GREGU,GS,BP 23,F-54501 VANDOEUVRE NANCY,FRANCE
[2] CTR RECH ECOL GEOL URANIUM,F-54501 VANDOEUVRE NANCY,FRANCE
[3] UNIV PAUL SABATIER,PETROPHYS & TECTON LAB,F-34000 TOULOUSE,FRANCE
[4] CENS,CEA,IRDI,ANAL ISOTOP & NUCL SECT,F-91191 GIF SUR YVETTE,FRANCE
[5] CEN VALRHO,DEAEA SEA,F-30205 BAGNOLS SUR CEZE,FRANCE
关键词
D O I
10.1007/BF00306440
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Seventy samples of Hercynian peraluminous granites (Guéret, Millevaches and Saint Sylvestre massifs) and metamorphic units of the Limousin area were analysed for Rb-Sr and Sm-Nd. The source rocks of the peraluminous granites can be found in the metamorphic rocks of Limousin, among them meta-igneous rocks were largely predominent over meta-sedimentary rocks in the source of the three granites. Millevaches and Guéret granites were generated by the partial melting of rocks comprising meta-volcanics and meta-sediments, whereas the Saint Sylvestre granite was produced exclusively by the melting of late Precambrian granites. This leads to confusing TDMNdvalues, the confusion being amplified by the segregation of monazite during the petrogenetic evolution of the peraluminous granites, which leads to dramatic fractionation in Sm/Nd ratios. The data of the present study tend to demonstrate that peraluminous granites do not give a good representation of isotopic mean crustal estimates. Late Precambrian time seems, however, to have been a period of extensive crustal generation in Western Europe. © 1990 Springer-Verlag.
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页码:163 / 172
页数:10
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