Rheological Complexity of Continental Lower Crust Based on Creep Tests of Mafic Rocks
详细信息
- 责任者：Zhou Yongsheng (State Key Laboratory of Earthquake Dynamics ; Institute of Geology ; China Earthquake Administration ; Beijing 100029 ; China)
- 刊名：Seismology and Geology
- 出版年：2013
- 卷期：35(2)
- 关键词：麻粒岩 ; granulite ; 地壳 ; crust
- 页码：p.328-346
- 图表：illus., 123 refs.
- 分类号：0802
- issnNo：ISSN0253-4967
- isbnNo：CN11-2192/P
摘要
It is crucial to research on creep tests of granulites in understanding rheology of lower crust, continental dynamics and seismogenic environment. However,based on analysis of creep data of mafic rocks,it was found that most of experimental studies of mafic rocks focused on creep of single-phase and two-phase aggregates,and creep data of mafic granulite is very limited. There are a lot of factors affecting rheology of mafic granulite. Besides the external causes of experimental conditions ( temperature,pressure,strain rate) , the internal causes,such as mineral components,grain size of samples,trace water,partial melt,mineral reactions,are very important influencing factors,which induced the results of creep tests on mafic rocks to be more complex. Therefore,there are a lot of uncertainties in discussing the rheological structures of lower crust according to creep data of singlephase and two-phase aggregates,which could not fulfill the requirement for studying lower crustal rheology. The calculation of the rheological strength of granulite constituted by multi-phase minerals based on end-member flow law parameters and empirical equation is only a kind of simple approximate,which could not replace experimental studies on rheology of granulite. The development trend of the experimental study on mafic rocks in the future will be to perform creep tests of multiphase natural mafic granulite and obtain flow laws of samples which can be used to study the rheology of continental lower crust quantitatively. The scientific questions and technological problems during experimental studies of creep tests of mafic rocks are multi-phase mineral rheology,partial molten under high temperature and interactions of mineral reaction and rheology,and all of those need more detailed experimental studies under high temperature and pressure.
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