Metallogenic assemblage related to magma thermal field and its inspiration for ore prospecting
Zhang Qi1,2,Mei Yousong3, Wang Jinrong4, Jin Weijun1, Li Chengdong5,Jiao Shoutao1,3,Chen Wanfeng4,
1. Institute of Geology and Geophysics， Chinese Academy of Sciences， Beijing 100029；
2. State Key Laboratory of Lithospheric Evolution， Beijing 100029；
3. Beijing Institute of Geology and Mineral Resources， Beijing 100012； 4. School of Earth Sciences， Lanzhou University， Lanzhou 370000；
5. Tianjin Institute of Geology and Mineral Resources， China Geological Survey， Tianjin 300170
Metallogenic assemblage related to magma thermal field is a new concept related to the distribution of temperature gradient of magma thermal field. In the period of magmatic activity concentration range， all of the deposits are formed and influenced by magma thermal field， regardless of the genesis and types of ore deposits， all belong to a metallogenic assemblage. It includes magmatic hydrothermal deposit， sedimentary deposits superimposed by the magma thermal field， metamorphic deposits superimposed by the magma thermal field， energy deposits superimposed by the magma thermal field and hot spring deposits. Metallogenic assemblage related to magma thermal field links metallization with nonmetallic mineralization， organic mineralization with inorganic mineralization， hydrothermal mineralization with sedimentary mineralization， hydrothermal mineralization with metamorphic mineralization， metallization with energy metallization. There are two kinds of distribution of the metallogenic assemblage trend， one is from high to low temperatures in longitudinal sections， such as W—Sn—Pb—Zn combination， Sn—Cu combination； anther one is composed of different minerals metallogenic combination in transverse sections， such as W—Sn—graphite combination， Au—Cu—coal combination， Pb—Zn—coal combination， oil—gas—coal—U combination. Metallogenic assemblage emphasizes comprehensive prospecting. In prospecting， in addition to pay attention to the main mineral prospecting， we should also pay attention to other minerals and mineral prospecting. Looking for metal deposits， we should pay attention to the nonmetallic deposits， sedimentary superimposed deposit， metamorphic deposits as well as the possibility of energy mineral deposits. Looking for high temperature metal deposits， we should pay attention to the possibility of other minerals accompanied by high temperature mineralization， the possibility of low temperature metal deposit mineralization， the possibility of other mineral accompanied by low temperature mineralization. Around the magma thermal field， looking for all possible deposits is our own duty.