山东临朐陶家庄白垩矿地质特征

Geological Characteristics of Cretaceous Deposit in Taoji azhuang Village of Linqu County in Shandong Province

山东临朐白垩矿赋存于新近纪临朐群山旺组中,矿体呈层状产出,倾斜平缓,东南薄、西北厚,平均厚度17.36m,厚度和品位变化稳定。在矿区北部,矿体内发育有玄武岩夹层,呈舌状近水平产出,约4～12m厚。矿床形成于新生代山旺期湖相盆地中,为化学和生物化学作用沉积形成。矿体底板为牛山组气孔—杏仁状玄武岩,其顶板为尧山组橄榄玄武岩。因长期风化剥蚀作用,大部分矿体的顶板已剥蚀掉,第四系黄土直接覆盖在矿体顶部。

Cretaceous deposit in Linqu ocurs in New Neogene per io d Shanwang formation in Linqu group. Orebodies occur in strata with gentle type. It is thin in SE and thick in NE with the average thickness 17.36m. Thickness a nd degree vary stably. In north of mine, basalt interlayers develope in orebodie s, and occur astongue type with horizontal trend and 4～12m thickness. Deposit w as formed in lake facies basin of Cenozoic Shanwang formation, and was formed by chemical and biochemical sedimentary function, lower part of orebodies is vesic ular-almond basalt of Niushan formation, and upper part is olivine basalt of Yao shan formation. Due to long-time weathering and denudation function, most upper part of orebodies have been denudated, and Quaternary yellow earth covers on upp er part of orebodies directly.