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单词	ultrabasic
释义	ultrabasic /ˌʌltrəˈbɛɪsɪk / adjective Geology Relating to or denoting igneous rocks having a silica content less than 45 per cent by weight.Major shear zones containing basic and ultrabasic igneous rocks are interpreted as suture zones.... This convergence gave rise to southward thrusting of the Yixieke forearc in Ordovician-Early Silurian time, which then led to obduction of the Buziwan ultrabasic rocks southward over the Kudi terrane. On the other hand, the Kudi gneisses are imbricated with an ophiolitic slice south to Kudi, and overthrust by the Buziwan ultrabasic rocks.
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