摘要
山东省绿岩带由橄榄科马提岩、TH_1拉斑玄武岩、FI 中酸性火山岩和沉积岩组成。缺少安山质岩石,镁铁质与长英质火山岩呈二元结构。TTG 片麻岩系高 Al_2O_3型,与绿岩带呈侵入接触关系。绿岩带的年龄值介于2439Ma 与至2855Ma 之间。TTG 片麻岩的年龄值介于2462Ma 至2628Ma 之间。TH_1拉斑玄武岩、FI 中酸性火山岩与高 Al_2O_3型片麻岩有成因联系,TH_1镁铁质岩石的部分熔融可以是片麻岩岩源的解释。麻粒岩可能是构造带上镁铁质岩浆和长英质岩浆活动的携带物。
The greenstone belt in Shandong province is composed of olivine Komatiite,TH_1 thoteiites, FI intermediate-acidic volcanics and sedimentary rocks,lacking andesitic rocks.The mafic and felsic volcanic rlcks show a binary structure.The TTG gneisses which belong to the high-Al_2O_3 type have intrusive contacts with the greenstone belt.The age values of the greestone belt are between 2439Ma and 2855Ma whereas those of the TTG gneisses are between 2462Ma and 2628Ma.The Th_1 tholeiites,FI intermediae-acidic volcanics and high-Al_2O_3 gneisses have a genetic relationship.The origin of the gneisses can be explained by partial melting of the Th_1 mafic rocks while the granulite(s)may be the product(materials) generated by mafic and felsie magmatic activity along the structural belt(s).
出处
《山东地质》
1993年第2期1-11,共11页
Geology of Shandong
