摘要
洱海东部新生代岩浆岩Ｋ－Ａｒ年龄范围为２９～３７Ｍａ，属于第三纪。岩石有超基性、基性、中性和酸性碱性岩。岩石化学成分富碱（Ｎａ２Ｏ＋Ｋ２Ｏ＝６．７～９．０％），钾销比值高（Ｋ２Ｏ／Ｎａ２Ｏ＞ｌ），钛（ＴｉＯ２＝０．４９％）和铁（ＦｅＯ＝５．８８％）富集度较低，氧化程度高（Ｆｅ２Ｏ３／ＦｅＯ＝０．６～４．６）等，属于典型的钾玄岩系列，有别于拉斑玄武岩系列、钙碱性系列和碱性玄武岩系列岩石。形成于陆内裂谷构造环境，其物质来源于交代的钾质富集型软流圈地幔源区。
The Cenozoic magmatic rocks in the eastern Erhai, Yunnan Province, with the K-Ar agerange from 29 to 37 Ma, correspond to the Tertiary in age. The alkali-rocks include ultrabasic, basic, intermediate and acidic rocks. Their petrochemistry is characterized by alkali-rich (Na2O+K2O=6. 7～9. 0%), highK2O/Na2O ratio (K2O/Na2O>1 ), lower Ti and Fe enrichment, and high oxidizing degree (Fe2O3/FeO=0. 64～4. 6), which belongs to a typical shoshonite series, and is different from tholeiite series, calc-alkalic series andalkaline-basalt series. Those rocks are formed by the control of continental rift tectonics, and their materialsources are from the asthenosphere of metaso-matte potassium-enriched mantle.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
1995年第4期423-433,共11页
Acta Petrologica Sinica
基金
国家自然科学基金
关键词
岩浆岩
岩石化学
钾玄岩系列
岩石成因
Magmatic rock
Petrochemistry
Shoshonite series
Ptrogenesis
Yunnan Province
