Geology - Diabase Dikes

Polylines representing the dikes, folds and cross sections for the Caldwell 7.5-minute quadrangle, North Carolina Diabase dike - inferred - Diabase: Black to greenish-black, fine- to medium-grained, dense, consists primarily of plagioclase, augite, and may contain olivine. Occurs as dikes up to 100 ft wide. Diabase typically occurs as spheriodally weathered boulders with a grayish-brown weathering rind. Red station location indicates outcrop or boulders of diabase.本数据集包含北卡罗来纳州考德威尔7.5分幅制图区的岩墙、褶皱及剖面的多段线（Polylines）数据。本次涉及的北卡罗来纳州辉绿岩（Diabase）岩墙为推断型产出体：辉绿岩呈黑色至深墨绿色，具细至中粒结构，质地致密，主要由斜长石（plagioclase）、普通辉石（augite）组成，可含橄榄石（olivine）；该类岩墙宽度可达100英尺。辉绿岩通常以球状风化巨砾的形式产出，表面带有灰棕色风化外壳。红色测点位置代表辉绿岩的露头或巨砾分布点。