粒度对韧性剪切带岩石变形的影响

樊光明; 曾佐勋; 储东如; 刘立林

粒度对韧性剪切带岩石变形的影响

中国地质大学地球科学学院武汉 430074

基金项目:

中国地质大学(武汉)校内基金项目“甲基乙烯基硅橡胶聚合物模型材料及其流变学研究” 95019006

江西二都、棠阴镇幅1∶5万区调联测项目 969016

详细信息

中图分类号: P554;P313
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出版历程
- 收稿日期: 1999-08-25
- 刊出日期: 2000-03-25

EFFECT OF GRAIN SIZE ON ROCK DEFORMATION IN DUCTILE SHEAR ZONE

Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 构造模拟研究表明, (1) 粒度是控制岩石流变性质的重要因素之一, 粒度越粗, 岩石粘度越高; (2) 粒状矿物含量与基质的比值越低, 粒度对岩石流变性质的影响就越小, 反之则越大; (3) 岩石的粒度差异对韧性剪切带的发育程度有着重要影响, 粒度越细, 韧性剪切带中有限应变越大.这些结果与野外所观察的地质现象及应变测量结果完全一致.
- 韧性剪切带 /
- 粒度 /
- 岩石流变性质 /
- 构造模拟
Abstract: The tectonic simulation research indicates: (1) The grain size is one of important factors controlling the rheological behaviors of a rock. The coarser the grain of minerals in a rock, the higher the viscosity of the rock. (2) The lower the ratio of the granular mineral content to the matrix, the smaller the effect of the grain size to the rheological behaviors of the rock, and vice versa. (3) The difference between grain sizes of a rock affects greatly the development of a ductile shear zone. The finer the grain size, the greater the finite strain in the ductile shear zone. These conclusions are perfectly consistent with the geological phenomena observed in the field and the actual measurement of finite strain of rocks in the ductile shear zone.
- ductile shear zone /
- grain size /
- rheological behavior of rock /
- tectonic simulation

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图 1 徐兰韧性剪切带地质略图

1.白垩系莲荷组; 2.侏罗系水北组; 3.中元古界兰水岩组; 4.程坊单元; 5.周坊单元; 6.周坊单元的糜棱岩化眼球状粗粒黑云二长花岗岩; 7.程坊单元的糜棱岩化细粒二长花岗岩; 8.碎裂岩化带; 9.U-Pb同位素年龄(Ma); 10.应变测量点

Fig. 1. Geological sketch map of Xulan ductile shear zone, Nancheng County, Jiangxi Province

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图 2 粒度对粘度的影响

a.填粒与基质比为1.4∶1;b.填粒与基质比为1∶1;各材料的粒径值见表 1

Fig. 2. Effect of grain size on viscosity

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图 3 韧性剪切带网格法实验结果

a.剪应变(γ)等值线图; b.转角(Ω)等值线图,(°);c. γ-x曲线;d. Ω-x曲线

Fig. 3. Experimental result of ductile shear zone with grid method

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表 1 不同模型材料流变测试结果

Table 1. Measured rheological deta from different model mate-rials

参考文献(10)

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