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Earth and Space Sciences · 术语表

什么是 Gabbro?

Definition 14.2 High School Earth and Space Sciences · 第 14 章 — Ocean Ridges and the Oceanic Lithosphere

Gabbro is a dark, coarse-grained igneous rock made mainly of plagioclase feldspar and pyroxene. It has the same composition as basalt, but it crystallised slowly, deep underground, which gave its crystals time to grow. It is the most abundant rock of the deep oceanic crust.

Left: gabbro, 9\, cm across, with dark pyroxene and pale feldspar crystals large enough to see; photograph Darla Sondrol (CC0). Right: a lump of green peridotite from the mantle, carried up inside the black basalt lava of a volcano in Arizona; photograph James St. John (CC BY 2.0). Left: gabbro, 9\, cm across, with dark pyroxene and pale feldspar crystals large enough to see; photograph Darla Sondrol (CC0). Right: a lump of green peridotite from the mantle, carried up inside the black basalt lava of a volcano in Arizona; photograph James St. John (CC BY 2.0).
Left: gabbro, 9 cm9\,\mathrm{cm} across, with dark pyroxene and pale feldspar crystals large enough to see; photograph Darla Sondrol (CC0). Right: a lump of green peridotite from the mantle, carried up inside the black basalt lava of a volcano in Arizona; photograph James St. John (CC BY 2.0).
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