Enrichment processes in the sub-arc mantle: A Sr-Nd-Pb isotopic and REE study of primitive arc basalts from the Philippines

被引：0

作者：

Knittel, U

Hegner, E

Bau, M

Satir, M

机构：

[1] INST MINERAL & LAGERSTATTENLEHRE, D-52056 AACHEN, GERMANY

[2] UNIV TUBINGEN, INST MINERAL PETR & GEOCHEM, D-72074 TUBINGEN, GERMANY

[3] GEOFORSCHUNGSZENTRUM POTSDAM, LAGERSTATTENBILDUNG PB43, D-14473 POTSDAM, GERMANY

来源：

CANADIAN MINERALOGIST | 1997年 / 35卷

关键词：

arc magmas; primitive basalts; isotopes; rare-earth elements; Philippines;

D O I：

暂无

中图分类号：

P57 [矿物学];

学科分类号：

070901 ;

摘要：

Within the Macolod Corridor, a SW-NE-trending extensional zone cross-cutting the Taiwan-Luzon are in the Philippines, numerous centers of eruption have produced primitive to moderately evolved basalts. Those from the eastern part of the area (Macolod basalts) are characterized by increasing LREE/HREE with decreasing HREE. Whereas such a relationship might reflect variable degrees of melting of garnet peridotite, decreasing Nd-143/Nd-144 values with increasing LREE/HREE suggest that this feature is inherited from the source. Clear correlations exist among Nd-143/Nd-144, Sr-87/Sr-86, and LREE/HREE values, but there is no correlation between these data and Pb isotopic compositions. In addition, LREE enrichment is accompanied by HFSE enrichment. These relationships are interpreted to reflect infiltration of the source by melts (controlling the REE and HFSE geochemistry). Larger contributions from the slab, indicated by high LREE/HREE Values and HFSE concentrations, are considered to result in higher degrees of partial melting and, hence, lower HREE concentrations.

引用

页码：327 / 346

页数：20

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