| 崔文智.鞍本地区前寒武纪铁建造中阳起石的变形显微构造研究[J].地质找矿论丛,1989,(3):48-57 |
| 鞍本地区前寒武纪铁建造中阳起石的变形显微构造研究 |
| DEFORMATIONAL MICROSTRUCTURES OF ACTINOLITE FROM PRECAMBRIAN IRON FORMATION IN ANSHAN-BENXI AREA, LIAONING PROVINCE, CHINA |
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| DOI：10.6053/j.issn.1001-1412.1989.3. 005 |
| 中文关键词: 前寒武纪铁建造 阳起石褶皱 剪切带 波状消光 (001)裂理 扭折 机械双晶 滑移系 双晶系统 针状阳起石 |
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| 中文摘要: |
| 研究表明鞍山-本溪地区前寒武纪铁建造中的阳起石经受了褶皱或剪切变形作用,在相当于绿片岩相的温压条件下可形成波状消光,(001)裂理,扭折、机械双晶,重结晶等显微构造。由裂理及扭折带推导的一组滑移系为(001)[100],扭折造成的机械双晶具有S=0.57的剪切值,其双晶系统为(100)[001]。 |
| 英文摘要: |
| The paper presents a study on deformational micro-structures of actinolite from precambrian iron formation in Anshan-Benxi area where rocks are subject to strong folding or ductile shearing. Undulatory extinction,(001)parting, kink band, secondary twinning and recrystalIization are well developed within actinolite crystals. In general case, the boundary of kink band is parallel to(100). The angle bewteen the boundary of kink band and symmetric(001)partings are 74°, therefore, the kink of actinolite is also refered as secondary twinning. A set of slip system(001)[100] is determined interms of slip system principle. The shear strain resulting in the formation of(100)[001] secondary twinning is 0.57 in the light of shear angle method. The width of twinning lamella in decrease and the number of twinning lamella in increase both depend on the intensity of folding. The(001)parting can develop from the beginning stage of deformation to the stage of tight folding. If shear strain increase progressively, the(001)parting will be disappear because of the influencee of twinning formation. The microstructures of actinolite in rocks of ductile shear zone is basically similar to these in folded rocks. Especially the development of needle actinolite crystal is the result of twin glidingg and recrystallization. |
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