The central peaks of several craters on the flanks of syrtis major are made up of an even more silica - rich rock , granite , that may have formed by extreme crystal separation or by large - scale remelting of earlier basalts 在大三角侧面，几个火山口的中间尖点是由一种矽含量更高的岩石花岗岩所构成，可能是经极度晶体分化，或早期玄武岩大?围重新熔融而形成。
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