陕西渭北东部寒武纪—奥陶纪岩相古地理与岩溶水赋存关系  

Relations between Cambrian-Ordovician lithofacies-paleogeography and occurrence of karst groundwater in eastern Weibei, Shaanxi Province

作　　者：党学亚[1] 张茂省[1] 喻胜虎 

机构地区：[1]中国地质大学,北京100083 [2]陕西省地勘局第二水文地质队,陕西渭南714000

出　　处：《地质通报》2004年第11期1103-1108,共6页Geological Bulletin of China

基　　金：中国地质调查局<鄂尔多斯盆地地下水勘查>项目(编号:1212010331302)成果。

摘　　要：在系统研究大量野外实测剖面和钻孔资料的基础上,认为本区寒武纪—奥陶纪岩相古地理演化可分为3个海侵海退旋回,构成了一套独特的、完整的沉积序列。沉积层的岩溶发育程度与沉积环境密切相关,从开阔海、潮下、高能、滩环境沉积层,到开阔海、低能、间歇高能环境沉积层,再到滨海、潮上、泥云坪和泥灰坪环境沉积层,岩溶发育程度逐渐降低,富水程度逐渐减弱。Based on systematic study of many measured stratigraphic sections and borehole data, the evolution of Cambrian-Ordovician lithofacies-paleogeography in the eastern Weibei area, Shaanxi, can be divided into three cycles of marine transgression and regression, which form a unique and complete sedimentary sequence. The karst development intensity of the deposits is closely related to the depositional environment. From the deposits formed in the open-sea, subtidal, high-energy and beach environment through the deposits formed in the open-sea, low-energy or intermittent high-energy environment to the deposits formed in the littoral, supratidal, mud flat environment, the karst development intensity in the deposits decreases and the water storage capacity becomes small gradually.

关 键 词：陕西 寒武纪-奥陶纪 岩相古地理 沉积旋回 岩溶作用 

分 类 号：P534.41[天文地球—古生物学与地层学] P641.134[天文地球—地质学]