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Petrogenesis of adamellites from eastern Shandong Province: Geochronological, geochemical, and Sr-Nd-Pb isotopic evidence
Tao Wang;  Shen Liu;  Jiaxi Zhou;  Yubin Li
2013
Source PublicationInternational Geology Review
Volume55Issue:14Pages:1786-1800
Abstract

Geochronology, geochemistry, and whole-rock Sr–Nd–Pb isotopes were studied on a suite of Mesozoic adamellites from eastern China to characterize their ages and petrogenesis. Sensitive high-resolution ion microprobe U–Pb zircon analyses were done, yielding consistent ages of 123.2 ± 1.8 to 122.1 ± 2.1 Ma for the samples. These rocks belong to the alkaline magma series in terms of K2O + Na2O contents (8.45–9.58 wt.%) and to the shoshonitic series based on their high K2O contents (5.23–5.79 wt.%). The adamellites are further characterized by high light rare earth element contents [(La/Yb)N = 14.96–45.99]; negative Eu anomalies (δEu = 0.46–0.75); positive anomalies in Rb, Th, Pb, and U; and negative anomalies in Sr, Ba, and high field-strength elements (i.e. Nb, Ta, P, and Ti). In addition, all of the adamellites in this study display relatively low radiogenic Sr [(87Sr/86Sr)i = 0.7081–0.7089] and negative ϵNd(t) values from –16.70 to –17.80. These results suggest that the adamellites were derived from low-degree partial melting of an enriched lithospheric mantle below the North China Craton (NCC). The parent magmas likely experienced fractional crystallization of potassium feldspar, plagioclase and Fe–Ti oxides (e.g. rutile, ilmenite, and titanite), apatite, and zircon during the ascent of alkaline rocks without crustal contamination.

KeywordAlkaline Intrusions Enriched Lithospheric Mantle Crustal Foundering Granite Petrogenesis Eastern Shandong Province
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/11031
Collection矿床地球化学国家重点实验室
Affiliation1.College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China
2.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
3.Department of Geology, Northwest University, Xian 710127, China
4.No. 5 Geological Party, Tibet Bureau of Geology and Mineral Exploration and Development, Golmud 816000, China
Recommended Citation
GB/T 7714
Tao Wang;Shen Liu;Jiaxi Zhou;Yubin Li. Petrogenesis of adamellites from eastern Shandong Province: Geochronological, geochemical, and Sr-Nd-Pb isotopic evidence[J]. International Geology Review,2013,55(14):1786-1800.
APA Tao Wang;Shen Liu;Jiaxi Zhou;Yubin Li.(2013).Petrogenesis of adamellites from eastern Shandong Province: Geochronological, geochemical, and Sr-Nd-Pb isotopic evidence.International Geology Review,55(14),1786-1800.
MLA Tao Wang;Shen Liu;Jiaxi Zhou;Yubin Li."Petrogenesis of adamellites from eastern Shandong Province: Geochronological, geochemical, and Sr-Nd-Pb isotopic evidence".International Geology Review 55.14(2013):1786-1800.
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