论文部分内容阅读
Vanuxem(1842)首次报道了芬格湖群一带的金伯利岩,此后在该区大约25公里宽45公里长的范围内陆续发现了82个岩墙和一个小火山管道。本文研究了伊萨卡地区具有代表性的三个金伯利岩产地的捕虏体与捕虏晶的矿物成分,並推测其来源深度及该区在晚侏罗世到早白垩世的地幔和地壳的特征。
Vanuxem (1842) reported for the first time the kimberlite of the Finch Group and subsequently found 82 dikes and a small volcano within about 25 kilometers of 45 kilometers of the area. In this paper, the mineral composition of xenoliths and xenocrysts in the three kimberlites originating in the Ithaca region is studied. The depth of the source and the source depth of the xenoliths and xenoliths in the area from late Jurassic to early Cretaceous mantle and crust feature.