Petrology of the mafic rocks of the Xigaze ophiolite,Tibet |
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Authors: | Jacques Girardeau Jean Claude C Mercier Wang Xibin |
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Affiliation: | (1) Institut de Physique du Globe de Paris, 4 Place Jussieu, F-75230 Paris Cedex 05, France;(2) Institut of Geology, Chinese Academy of Geological Sciences, Beijing, China |
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Abstract: | The Xigaze ophiolite (Yarlung-Zangbo suture zone, Southern Tibet, China) shows an unusual crustal sequence characterized by a lack of large masses of cumulate gabbros, by dolerites intrusive throughout the whole ophiolite sequence, and by the injection of dolerites in already serpentinized peridotites. The abyssal tholeiitic nature of all the mafic rocks indicates that they have been generated at an oceanic ridge. All the geological arguments and petrological and textural data on the mafic rocks point to very low heat production and large heat losses through widespread intensive sea-water circulation, for the spreading centre in which they have been formed, in good agreement with a slow-spreading ridge origin. |
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