Petrology of the mafic rocks of the Xigaze ophiolite, Tibet

摘要: The Xigaze ophiolite (Yarlung-Zangbo suture zone, Southern Tibet, China) shows an unusual crustal sequence characterized by a lack of large masses cumulate gabbros, dolerites intrusive throughout the whole sequence, and injection in already serpentinized peridotites. abyssal tholeiitic nature all mafic rocks indicates that they have been generated at oceanic ridge. All geological arguments petrological textural data on point to very low heat production losses through widespread intensive sea-water circulation, for spreading centre which formed, good agreement with slow-spreading ridge origin.