THOLEIITIC VOLCANIC-ROCKS OF THE LATE ARCHEAN BLAKE RIVER GROUP, SOUTHERN ABITIBI GREENSTONE-BELT - ORIGIN AND GEODYNAMIC IMPLICATIONS

被引：78

作者：

LAFLECHE, MR ^{[1
]}

DUPUY, C ^{[1
]}

DOSTAL, J ^{[1
]}

机构：

[1] ST MARYS UNIV, DEPT GEOL, HALIFAX B3H 3C3, NS, CANADA

来源：

CANADIAN JOURNAL OF EARTH SCIENCES | 1992年 / 29卷 / 07期

关键词：

D O I：

10.1139/e92-116

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The late Archean Blake River Group volcanic sequence forms the uppermost part of the southern Abitibi greenstone belt in Quebec. The group is mainly composed of mid-ocean-ridge basalt (MORB)-like tholeiites that show a progressive change of several incompatible trace element ratios (e.g., Nb/Th, Nb/Ta, La/Yb, and Zr/Y) during differentiation. The compositional variations are inferred to be the result of fractional crystallization coupled with mixing - contamination of tholeiites by calc-alkaline magma which produced the mafic - intermediate lavas intercalated with the tholeiites in the uppermost part of the sequence. The MORB-like tholeiites were probably emplaced in a back-arc setting.

引用

页码：1448 / 1458

页数：11

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