2016 , Vol. 31 >Issue 7: 700 - 707
DOI: https://doi.org/10.11867/j.issn.1001-8166.2016.07.0700.
Progresses and Perspectives of Research of the Evolution of Kimberlite and Evaluation for Diamond Potential
Received date: 2016-03-27
Revised date: 2016-06-23
Online published: 2016-07-10
Supported by
Foundation item:Project supported by the National Natural Science Foundation of China “Formation mechanism of placer diamond polycrystalline aggregates from the western part of the Yangtze Craton and their response to deep earth”(No.41373025), “Study on the micro-structure, micro-component typomorphic characteristics of natural diamond polycrystalline from North China craton and their geological significance”(No.41073021)
Copyright
Kimberlite is an effective vector for researches and discussions on mantle dynamics process, lithosphere evolution and other major scientific problems, which plays an important role in revealing the forming environment, origin, source and prospecting of diamond. Currently, the developing research process of Kimberlite is still hampered by several key scientific problems, such as the evolution and the significance of the Kimberlite, evaluation for diamond potential and so on. Based on high-pressure melt simulation experiments, researches about matrix mineral, fine syngenetic inclusion (cognate xenolith?) and cryptocrystalline in the margin area of Kimberlite pipe, it seems that the initial composition features of Kimberlitic magma can be effectively analyzed. However, these experiments and researches are not only difficult to identify source characteristics of Kimberlitic magma efficiently, but also difficult to distinguish those effects on magma from which is assimilation/contamination, fluid fractionation or devitrification. Lacking of systematic research reports about recrystallization and (or) regrowth mineral on micro-composition and micro-structure, it is hard to efficiently and accurately analyze the changes and degassing effects in Kimberlitic magma, so far as to reveal the process of Kimberlitic magma evolution. Although Kimberlite diamond potential can be evaluated based on mineral assemblage, water content of olivine, there still exist some kinds of problems, like the index system being too simple, and the data accumulation being too little. Carrying out the fine micro-fabric studies between diamond-bearing Kimberlite and non diamond-bearing one can establish the scientific foundation for rebuilding the Kimberlitic magma evolution mechanism effectively and reveal the response to deep geological process. Meanwhile, on the basis of known diamond mines, a model for initial grade prediction of diamond and analysis of preservation potential can be set up to realize final purpose to evaluate the diamond potential in unknown Kimberlite areas in effect validity.
Key words： Kimberlite; Magma evolution; Diamond potential; Micro-fabric.
Zhijun Yang , Shanshan Huang , Yaoming Chen , Xiaoxiao Li , Xuan Zeng , Wenxiu Zhou . Progresses and Perspectives of Research of the Evolution of Kimberlite and Evaluation for Diamond Potential[J]. Advances in Earth Science, 2016 , 31(7) : 700 -707 . DOI: 10.11867/j.issn.1001-8166.2016.07.0700.
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