大庆石油地质与开发

2005, (04) 25-27+6

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贺兰山汝箕沟玄武岩地质地球化学特征及其构造环境意义
Geologic Geochemical Features of Basalt in Ruqi Clough of Helan Mountain and Its Structural Environmental Significance

王锋,刘池阳,杨兴科,苏春乾
WANG Feng; et al.(Geology Department of Northwest University; Xi’an 710068;China);

摘要(Abstract):

根据贺兰山汝箕沟玄武岩的地质构造位置、产状特征、岩石组构和地球化学指标等,将其划归为大陆裂谷玄武岩系列,它代表了典型的陆内拉张环境。野外调研发现它整合覆盖于上三叠统之上,其上中侏罗统与之呈微角度不整合,结合同位素测年及裂变径迹测试等资料,认为其年龄值为229~193Ma,反映晚三叠世末期到早侏罗世末期,贺兰山地区处于拉张区的沉积构造环境。
According to geologic structural location, features of occurrence, rock fabric and geochemical index of basalt in Ruqi clough of Helan Mountain, it can be regarded as continental rift basalt. It indicates typical intracontinental tension environment. During field research it is found that the basalt conformably underlies upper Triassic, and there is unconformity between upper middle Jurassic and the basalt with minor angle. Based on isotopic assay and fission track tests, it is thought that the basalt is 229~193 Ma, which indicates that from the late period of Triassic to the late period of early Jurassic Helan Mountain area was under the sedimentary structural environment of tension area.

关键词(KeyWords): 贺兰山;汝箕沟;玄武岩;地质地球化学特征;大地构造环境
Helan Mountain; Ruqi clough; basalt; geologic geochemical features; geostructural environment

Abstract:

Keywords:

基金项目(Foundation): 国家重点基础研究发展计划(973计划)项目“多种能源矿产共存成藏(矿)机理与富集分布规律”(2003CB214601)

作者(Authors): 王锋,刘池阳,杨兴科,苏春乾
WANG Feng; et al.(Geology Department of Northwest University; Xi’an 710068;China);

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