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学科主题: Geology
题名: Studies on petrology and geochernistry of the Later Cretaceous basalts and mantle-derived xenoliths from eastern Shandong.
作者: Yan, J ; Chen, JF ; Xie, Z ; Gao, TS ; Ka, F ; Zhang, XD ; Liu, MW
通讯作者: jyan@ustc.edu
关键词: basalt ; Ar-40-(39) Ar age ; xenolith ; lithosphere ; thinning ; Jiaozhou
刊名: ACTA PETROLOGICA SINICA
发表日期: 2005
卷: 21, 期:1, 页:99-112
收录类别: sci
部门归属: Univ Sci & Technol China, Lab Chem Geodynam, Sch Earth & Space Sci, Anhua 230026, Peoples R China; Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Marginal Sea Geol, Guangzhou 510640, Peoples R China; Chinese Acad Sci, S China Sea Inst Oceanol, Guangzhou 510640, Peoples R China; Ohio State Univ, Dept Geol Sci, Columbus, OH USA; Acad Geol Survey Shandong Province, Weifang 261021, Peoples R China
项目归属: 海洋地质
摘要: The Wangshi group basalts cropped out in Daxizhuang, Jiaolai basin, eastern Shandong, belong to high-Ti alkaline basalt series. The basalt was emplaced at Late Cretaceous with Ar-40-Ar-39 plateau age of 73.2 +/- 0.3 Ma. The basalt is enriched in Na2O and has Mg# values of 63 similar to 66 and normative (Ne-Hy-Q) of 6.03 similar to 11.05, suggesting a depths of generation of 50 similar to 70 km for the basalt. The enrichment of light rare earth elements (LREE) with (La/Yb)(N) of 11.18 similar to 12.56 and large ion lithophile elements (LILE), such as Th and Zr, and reletively differentiated heavy rare earth element (HREE) patterns suggest a continental intraplate setting. High Positive epsilon(Nd) (T) value of 7.08 similar to 7.55 and low Sr-87/Sr-86(T) ratio of 0.7035 similar to 0.7038 for basalt in Daxizhuang suggest that the basalt was virtually not contaminated by crustal materials during their ascending and the initial basltic magma was generated by a depleted mantle source. The parantal basaltic magma was a mixture of melts derived from the asthenospheric mantle and young depleted lithospheric mantle. Mantle derived spinel-iherzolite xenoliths have been discovered in the basalt. The estimated equilibrium P-T condition of xenoliths was about 20 kb and 1010 similar to 1140degreesC. The estimated equilibrium P-T condition of xenoliths and depth of the generation of the basaltic magma suggested that the lithosphric thickness in Jiaozhou area was about 60 similar to 70 km in Late Cretaceous. This further inferred that the lithospheric thinning and asthenospheric upwelling in eastern China took place at 125 to 73 Ma B. C. Hereafter, there was a uniform dynamic setting in eastern China.
WOS记录号: WOS:000227476000010
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4880
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Recommended Citation:
Yan, J; Chen, JF; Xie, Z; Gao, TS; Ka, F; Zhang, XD; Liu, MW.Studies on petrology and geochernistry of the Later Cretaceous basalts and mantle-derived xenoliths from eastern Shandong.,ACTA PETROLOGICA SINICA,2005,21(1):99-112
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