2003•Journal of Mineralogy and PetrologyRequires access
PETROGENESIS AND SIGNIFICANCE OF RODINGITES AMONG THE SERPENTINITE IN JINGSHAJIANG OPHIOLITE BELT
Wei Jun-qi, Chen Kei-xu
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Abstract
The Rongjiao ophiolite consists of ultra-mafic rocks and diallage gabbroic veins in Jinshajiang ophiolite belt. During emplacement of ophiolite,the diallage gabbroic veins are fractured into irregular rock mass enclosed by ultra-mafic rocks. The ultra-mafic rocks and diallage gabbro are turned into serpentinite and rodingites through metasomatism and alteration. Formaiton of rodingites are resulted from serpentinization of ultra-mafic rocks and grossularization of plagioclase in diallage gabbro and related to tectonism imposed on ophiolite. Therfore, the rodingites is formed in the course of deformation and metasomatism.Occurrence of rodingites in the Rongjiao ophiolite proves that there is not eclogite in Jinshajiang ophiolite belt which belong to prehnite-chlorite low-grade metamorphic facies and Jinshajiang ophiolite belt is resulted from the cold emplacement of residual piece of oceanic crust.