扬子地块西缘新元古代镁铁超镁铁质岩研究进展

Advance in the Study of Neoproterozoic Mafic-Ultramafic Rocks in the Western Margin of the Yangtze Craton

扬子地块西缘新元古代岩浆活动非常强烈,花岗岩广布。最近研究表明,该区还有较大规模的新元古代基性岩浆活动。本文着重总结和评述了扬子地块西缘的新元古代镁铁 超镁铁质岩的最新研究成果,认为这一期岩浆活动是由约0.95～0.90Ga造山带的岩浆活动和0.86～0.74Ga非造山的岩浆活动组成,反映了从岛弧到板内裂谷的构造演化模式。

Neoproterozoic magmatic rocks, especially granitic intrusions, are widespread in the western margin of the Yangtze craton. Recent studies have also confirmed that there occurred intense Neoproterozoic basic magmatism in the area. Advance in the study of Neoproterzoic mafic-ultramafic rocks in the western margin of the Yangtze craton has been reviewed in this paper. These rocks consists of 0.95-0.90Ga orogenic rocks and 0.86-0.74Ga anorogenic rocks, which reflect Neoproterozoic tectonic evolution from arc to intra-continental rift in the area.