玻基辉橄岩(英语:limburgite)是一种超基性暗绿色熔岩,常与碱性玄武岩伴生。岩石具斑状和似斑状结构,斑晶为橄榄石和含普通辉石,基质为黄褐色玻璃或由含钛辉石、金属矿物和少量斜长石组成的微晶集合体。当岩石中辉石含量超过橄榄石时可过渡为玻基辉石岩。苦橄岩是橄榄岩的浅成-喷出相。主要产状是岩床、岩墙等小侵入体,其次是玄武质熔岩下部堆晶相。主要由橄榄石(含量为50-70%)和辉石组成。辉石多为普通辉石、含钛普通辉石,有时也出现铬透辉石斜方辉石基性斜长石棕色角闪石云母和金属矿物,偶尔见磷灰石。玻基辉橄岩具有微晶结构、粒状结构、嵌晶结构、填间结构等。当苦橄岩具斑状结构时则过渡为苦橄玢岩。

德国林堡采矿场(模式产地)的玻基辉橄岩。

Wikiwand in your browser!

Seamless Wikipedia browsing. On steroids.

Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.

Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.