矿床地质2018，Vol.37Issue(1)：81-90,10.DOI:10.16111/j.0258-7106.2018.01.006
川东北黄金口背斜三叠系深部杂卤石特征及成因探讨
Sedimentary characteristics and genetic study of deep polyhalite in Huangjingkou anticline of northeast Sichuan
摘要
Abstract
Northeast Sichuan had conditions for potassium formation in early Triassic,and potassium rich brine was found in Huangjingkou anticline area about 40 years ago.Nevertheless,there has been no systematic research on deep polyhalite.A new round of looking for sylvine in Sichuan basin was started not long ago,and an exploratory well was constructed in Huangjingkou anticline.The authors studied the sedimentation characteristics of saltbearing formation,and systematically collected and tested polyhalite,halite and anhydrite evaporation samples from the place deeper than 3500 m.Polyhalite occurs mainly in the salt-bearing formation of T1j5-2 and T2l1-1,and can be divided into four cycles of salt-forming stage.There are 8 layers of polyhalite,with the total thickhess being 33.5 m.The polyhalites in this well mainly occur in anhydrite in the thin-bedded form,and parts of them occur in halite in the spotted,lumpy and thin-bedded forms,characterized by subhedral-anhedral granular,platy and columnar textures under the microscope.Combined with the observation of the X-ray diffraction and scanning electron microscopy,it is tentatively considered that the polyhalite in this well is mainly of depositional genesis.关键词
地质学/深部杂卤石/沉积特征/成因/黄金口背斜Key words
geology/deep polyhalite/sedimentary characteristics/genesis/Huangjingkou anticline引用本文复制引用
仲佳爱,郑绵平,唐学渊,刘铸,王富明,蔡策,庞博..川东北黄金口背斜三叠系深部杂卤石特征及成因探讨[J].矿床地质,2018,37(1):81-90,10.基金项目
本文得到四川省地勘基金项目“四川省宣汉县黄金口钾盐普查”和中国地质调查局项目(编号:1212010011810)联合资助 （编号:1212010011810）
