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Earth and Space Sciences · 术语表

什么是 Ophitic texture, granoblastic texture？

又称： ophitic texture · granoblastic texture

Definition 31.1 University Earth and Space Sciences — Year 2 · 第 31 章 — Field and Lab Methods II

An igneous rock has an ophitic texture when large pyroxene crystals enclose small, randomly oriented laths of plagioclase; the texture is typical of dolerite, gabbro and basalt. A metamorphic rock has a granoblastic texture when it is an aggregate of broadly equidimensional crystals of about the same size, in many cases anhedral, whose straight boundaries meet in threes at angles near $120{}^{\circ}$ .

Two textures between crossed polars. Left: a single crystal of augite (blue and green) encloses laths of plagioclase striped by their twinning, the arrangement of an ophitic texture; field of view 7\, mm. Photograph Strekeisen, CC BY-SA 4.0 (Wikimedia Commons). Right: a garnet–mica schist. The garnet, black because it is isotropic, is a large crystal that grew in the solid state; inclusions of quartz cross it in trails, and the foliation of muscovite (bright colours), biotite (brown) and quartz (grey) bends around it. Photograph Jackdann88, CC BY 3.0 (Wikimedia Commons). — Two textures between crossed polars. Left: a single crystal of augite (blue and green) encloses laths of plagioclase striped by their twinning, the arrangement of an ophitic texture; field of view $7\,\mathrm{mm}$ . Photograph Strekeisen, CC BY-SA 4.0 (Wikimedia Commons). Right: a garnet–mica schist. The garnet, black because it is isotropic, is a large crystal that grew in the solid state; inclusions of quartz cross it in trails, and the foliation of muscovite (bright colours), biotite (brown) and quartz (grey) bends around it. Photograph Jackdann88, CC BY 3.0 (Wikimedia Commons).

Two textures between crossed polars. Left: a single crystal of augite (blue and green) encloses laths of plagioclase striped by their twinning, the arrangement of an ophitic texture; field of view 7\, mm. Photograph Strekeisen, CC BY-SA 4.0 (Wikimedia Commons). Right: a garnet–mica schist. The garnet, black because it is isotropic, is a large crystal that grew in the solid state; inclusions of quartz cross it in trails, and the foliation of muscovite (bright colours), biotite (brown) and quartz (grey) bends around it. Photograph Jackdann88, CC BY 3.0 (Wikimedia Commons). — Two textures between crossed polars. Left: a single crystal of augite (blue and green) encloses laths of plagioclase striped by their twinning, the arrangement of an ophitic texture; field of view $7\,\mathrm{mm}$ . Photograph Strekeisen, CC BY-SA 4.0 (Wikimedia Commons). Right: a garnet–mica schist. The garnet, black because it is isotropic, is a large crystal that grew in the solid state; inclusions of quartz cross it in trails, and the foliation of muscovite (bright colours), biotite (brown) and quartz (grey) bends around it. Photograph Jackdann88, CC BY 3.0 (Wikimedia Commons).

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