Petrogenesis and mineralization of the Maobei complex from the southern Sulu ultrahigh-pressure metamorphic belt, eastern China

作者：Zhang ZeMing^*; Shen Kun; Liu YongSheng; You ZhenDong; Shi Chao; Wang JinLi

来源：Acta Petrologica Sinica, 2007, 23(12): 3095-3115.

• Maobei complex
• ultrahigh-pressure metamorphism
• continent deep subduction
• rutile deposit
• Sulu orogenic belt
• Rodinia supercontinent breakup

The Maobei complex located in the southern Sulu orogenic belt is a layered ultrahigh-pressure metamorphic rock body, which consists of garnet-peridotite, eclogite, jadeite-quartzite and garnet-phengite-quartz schist. The rutile- and ilmenite-rich eclogites occur as a continuous layer from the surface to the depth greater than 700m with a total thickness over 200m, forming a large titanium ore deposit. The investigations of petrology, geochemistry and geochronology show that the protolith of the Maobei complex is a layered intrusion consisting of olivine-gabbro, gabbro, diorite and granite, which was formed by intensive fractionation crystallization of a basaltic magma during the breakup of the Rodinia supercontinent at the Neoproterozoic. In addition, the Maobei complex was extensively interacted with meteoric water during the Neoproterozoic global glaciation. This body has been subjected to the ultrahigh-pressure metamorphism with a peak-metamorphic condition of more than 800 degrees C and 4.5GPa during the deep continental subduction in the Triassic. By this process, the titanomagnetite-rich gabbros were transformed into the rutile-rich eclogites which are the parent rocks of the Maobei rutile deposit.

• 出版日期2007-12
• 单位中国地质大学（北京）; 中国地质科学院