Geochemical Characteristics of Early Cretaceous Volcanic Rocks from
详细信息
- 责任者：Song Lizhong (Faculty of Natural Resource and Information Technology ; China University of Petroleum ; Beijing 102249 ; China) ; Zhao Zehui
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(4)
- 关键词：火山岩 ; volcanic rocks ; 岩石地球化学 ; lithogeochemistry ; 松辽平原 ; Songliao Plain
- 页码：p.1182-1194
- 图表：illus., 2 tables, 40 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Early Cretaceous volcanic rocks from Songliao basin,Northeast China,are characterized with basic rocks(BRS) which include dorgalite and basalt, intermediate rocks (IRS) which include basaltic andesite, andesite and trachyandesite, and acid rocks(ARS) include trachyte, trachydacite, dacite and rhyolite. The major element, trace element and isotopic data of the Early Cretaceous volcanic rocks are reported in this paper. All samples have distinct characteristics with enriched large ion lithophile elements (LILE) relative to high field strength elements (HFSE), enriched light rare earth element (LREE) relative to heavy rare earth element (HREE), relatively low in (87Sr/86Sr)i and high in εNd(t). According to their geochemical characteristics, the magmas of BRS were generated partial melting of the depleted mantle which have been enriched, with little contaminated by crust. The generation of IRS magmas origined from melting of juvenile crust components underplated by upwelling of depleted mantle and the magmas of ARS derived from partial melting of juvenile crust components which origined from depleted mantle with contaminated by supracrust. Conclusionally, the dynamic model of stretch and extension in Late Jurassic-Early Cretaceous in Songliao Basin was a result, from partial melting depleted mantle induced by delamination of thickened subcontinental mantle root induced by orogenesis with Okhotsk-Mongolia ocean closure. The rift-extensional tectonic setting of Songliao Basin showed active rift characteristics.
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