气候变化领域集成服务门户(CCPortal): Coexisting A1 and A2 granites of Kudaru Complex: implications for genetic and tectonic diversity of A-type granite in the Younger Granite province; north-central Nigeria

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DOI	10.1007/s00531-020-01818-8
	Coexisting A1 and A2 granites of Kudaru Complex: implications for genetic and tectonic diversity of A-type granite in the Younger Granite province; north-central Nigeria
	Kamaunji V.D.; Wang L.-X.; Ahmed H.A.; Zhu Y.-X.; Vincent V.I.; Girei M.B.
发表日期	2020
ISSN	14373254
起始页码	511
结束页码	535
卷号	109 期号:2
英文摘要	The Nigerian alkaline ring complexes have long been regarded as typical anorogenic A-type granite. However, uncertainty still surrounds many aspects of their petrogenesis and tectonic implication. In this paper, a combined study of whole rock geochemistry, Nd-Pb isotope and zircon U-Pb dating was carried out on the Kudaru ring complex from north-central Nigeria. The complex consists of mildly alkaline fayalite granite porphyry, peralkaline arfvedsonite granite and metaluminous biotite granite, which were emplaced between 176.9 ± 2.5 and 180.55 ± 0.6 Ma. These rocks are characterized by variably high alkalis, HFSEs, Ga/Al ratios, and zircon saturation temperature, typically of A-type granites. Notably, the popular subdivision scheme of A-type granite permits the discrimination of the alkaline-peralkaline granites as typical “A1-type” granites and the metaluminous granite as “A2-type”. These co-existing A1 and A2 granites show distinct isotopic compositions with less negative εNd (t) values and higher 206Pb/204Pb ratios for the former, indicating that the magma which gave rise to the A1 and A2 suites was derived from an enriched mantle source but modified to different extent during ascent. Notably, the coexistence of A1-A2 granites do not indicate discrete tectonic regimes (intraplate setting for A1 and post-orogenic setting for A2), but rather point to a significant role of crustal contamination, as seen also from the differences in Y/Nb ratios. © 2020, Geologische Vereinigung e.V. (GV).
英文关键词	A-type granites; Coexisting of A1 and A2 granites; Crustal contamination; Kudaru complex; North-central Nigeria
语种	英语
scopus关键词	A-type rock; crustal contamination; granite; magma; petrogenesis; tectonic setting; Nigeria
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147714
作者单位	School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China; Leibniz Universität Hannover, Institute of Mineralogy, Hannover, 30167, Germany; Department of Geology, Modibbo Adama University of Technology, P.M.B. 2076, Yola, Nigeria; Department of Geology, Bayero University, Kano, Nigeria
推荐引用方式 GB/T 7714	Kamaunji V.D.,Wang L.-X.,Ahmed H.A.,et al. Coexisting A1 and A2 granites of Kudaru Complex: implications for genetic and tectonic diversity of A-type granite in the Younger Granite province; north-central Nigeria[J],2020,109(2).
APA	Kamaunji V.D.,Wang L.-X.,Ahmed H.A.,Zhu Y.-X.,Vincent V.I.,&Girei M.B..(2020).Coexisting A1 and A2 granites of Kudaru Complex: implications for genetic and tectonic diversity of A-type granite in the Younger Granite province; north-central Nigeria.International Journal of Earth Sciences,109(2).
MLA	Kamaunji V.D.,et al."Coexisting A1 and A2 granites of Kudaru Complex: implications for genetic and tectonic diversity of A-type granite in the Younger Granite province; north-central Nigeria".International Journal of Earth Sciences 109.2(2020).