(中国地质大学地球科学学院, 武汉 430074)
摘 要: 罗布莎豆荚状铬铁矿床产于高度部分熔融和动力重熔的变质橄榄岩中。地 幔剪切带不仅控制了铬铁矿的分布,而且为铬铁矿的形成提供了热 动力和构造动力。 该铬铁矿床是在晚中生代岩石圈伸展和地幔隆升的构造背景下,由部分 熔 融、剪切流 变、动力重熔、剪切破裂等多种动力成矿方式综合作用下形成的递进改造式地幔动力矿床。
关键字: 地幔剪切带 动力成矿 豆荚状铬铁矿 罗布莎
(Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074)
Abstract:The Luobusha podiform chromites locate at metamorphic peroditites that show partial melting and dynamic remelting. The mantle shear zones not only control distribution of the chromites, but also provide heat souce and tectonic dynamics. The chromites are progressive reworking type mantle deposits formed by shear flow, partial melting, shear fracture and dynamic remelting in the tectonic setting of Mesozoic lithospheric extension and mantle uplife .
Key words: mantle shear zone dynamic mineralization podiform chromite Luobusha