摘要
紫金山岩体是鄂尔多斯盆地东缘一个多期次形成的碱性杂岩体,从外到内可分为六个相带,地貌上构成了正向穹窿型热力构造。二长岩、霓辉正长岩、暗霞正长岩和霞石正长岩四个相带构成中浅成侵入型热力构造;响岩、响岩质火山角砾岩和粗面斑岩、粗面质火山角砾岩两个相带构成了表浅层火山喷发型热力构造。三叠纪以来紫金山有三期热力作用。晚侏罗世—早白垩世的一期中浅成侵入型热力作用促进了上古生界煤变质并发生二次生烃作用;促进了上古生界烃源岩(煤系和暗色泥岩)热演化;岩浆上侵形成火山刺穿遮挡圈闭油气藏。
Zijinshan complex in eastern Ordos basin, an alkaline rock body formed in several stages, can be divided into six phases from the outer part to the core. The rock body morphologically forms a normal dome type thermal structure. Monzonite, aegirine-augite syenite, malignite and nepheline syenite belong to the intermediate-deep intrusion type thermal structure, whereas phonolite/phonolitic volcanic breccia and trachyte/trachytic volcanic breccia are of the superficial/shallow volcanic eruption type. Since the beginning of Triassic period, there have occurred three thermal activities in Zijinshan area. The intermediate-deep intrusion from Late Jurassic to Early Cretaceous accelerated coal metamorphism which resulted in secondary hydrocarbon production. It also accelerated the maturity of Upper Paleozoic hydrocarbon source rock （ coal and dark mudstone）, and led to volcanic piercing closure resulting from upward magmatic intrusion, which finally became an oil/gas-bearing structure.
出处
《地球学报》
EI
CAS
CSCD
北大核心
2007年第6期620-626,共7页
Acta Geoscientica Sinica
基金
科技部国家重点基础研究(973项目)子课题(编号:2003CB214601-03C)资助。
关键词
紫金山岩体
热力构造
能源矿产
影响
Zijinshan rock body, thermal structure, energy resources and mineral, effect
