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magmatic sulfide Ni-Cu deposit. in China

Journal of Earth Science 1999年第1期18卷 12-16页

作者： Tang Zhongli Gansu Bureau of Geology and Mineral Resources, Lanzhou 730000

Deep seated magmatic liquation injection deposit. form a major type of magmatic sulfide deposit.in China. The reserves of nickel and copper in this type of deposit.may attain several hundred thousand tons (*** 7 and Karatunggu) to nearly ten million tons (***). Those deposit. can be classified as large or superlarge deposit.. The ore grade is relatively high, commonly with w (Ni)>1 %. The mineralized intrusions are small in size, generally only 0.0 n km 2 to 0. n km 2, with the largest one not exceeding a few km 2. Before intruding, the primary magmas have undergone liquation and partial crystallization at depth; as a result, the magmas have partitioned into barren magma, ore bearing magma, ore rich magma and ore magma, which then ascended and injected into the present locations once or multiple times, to form ore deposit.. The above mentioned mineralizing process is known as deep seated magmatic liquation injection mineralization. The volume of the barren magma is generally much larger than those of the ore bearing magma, ore rich magma and ore magma. In the ascending process, most of the barren magma intruded into different locations or outpoured onto the ground surface, forming intrusions or lava flows. The rest barren magma, ore bearing magma, ore rich magma and ore magma may either multiple times inject into the same place in which rocks and ores are formed or separately inject into different spaces to form rocks and ores. Such deep seated magmatic liquation injection deposit. have a much smaller volume, greater ore potential and higher ore grade than those of in situ magmatic liquation deposit.. Consequently, this mineralizing process leads to the formation of large deposit. in small intrusions.

关键词： deep seated liquation injection spatio temporal distribution magmatic sulfide deposit.

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