| 大竹卡超基性岩体的动力挤压现象及讨论 |
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| 引用本文： | 林学农.大竹卡超基性岩体的动力挤压现象及讨论[J].地球化学,1981(2):181-184,i004. |
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| 作者姓名： | 林学农 |
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| 摘 要： | The ultrabasic rocks of Dazuka form the eastern part of Rinbung-Bainang ultramafic massif which is mainly composed of harzburgite intercalated with dunite, and high in MgO. This ultrabasic massif is assigned to magnesian ultramafic massif of Alpine type. In these ultrabasic recks, the major minerals are forsterite, enstatite, diopsite and chrome spinel The rocks are very fresh, and therefore, texture and structure characteristics of compression during tectonic movement are commonly observed. Undulatory extinction, polysynthetic twin, kink band structure, enlongation and contortion of olivine and orthopyrexene crystals, radiating cracks occurring around the chrome spinels and so forth are commonly observed phenomena. All these features show that the massif was under constant action of tectonic compression during its evolution process and after it was basically consolidated. It is reasonable to consider that the tectonic compression was related to plate collision between the Indian and Eurasian plates.
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| 关 键 词： | 超基性岩 动力挤压 镁橄榄石 顽火辉石 透辉石 |
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