Bulk-rock elemental and Sr-Nd-Pb isotopic, and in-situ elemental and Hf-O isotopic analyses of hornblendites from the Gangdese arc, southern Tibet

We report bulk-rock major and trace elements and Sr-Nd-Pb isotopes, and in-situ amphibole and apatite electron microprobe data and zircon trace elements and Hf-O isotopes of hornblendites from the Gangdese arc, which was an Andean-type convergent margin prior to the Indian–Asian collision. These data were used to reveal early sulfide saturation in the Gangdese lower crustal arc magmas induced by assimilation of ancient crustal materials.

我们报道了冈底斯弧（Gangdese arc）角闪石岩的全岩主量与微量元素、锶-钕-铅同位素（Sr-Nd-Pb isotopes），以及原位角闪石（in-situ amphibole）与磷灰石的电子探针（electron microprobe）数据、锆石微量元素与铪-氧同位素（Hf-O isotopes）；该弧在印亚碰撞（Indian–Asian collision）前为安第斯型汇聚边缘（Andean-type convergent margin）。这些数据被用于揭示冈底斯下地壳弧岩浆中由古老地壳物质同化作用（assimilation）引发的早期硫化物饱和（sulfide saturation）现象。