攀西裂谷南段鸡街碱性超基性岩微量元素和Sr-Nd同位素地球化学及其成因探讨

	攀西裂谷南段鸡街碱性超基性岩微量元素和Sr-Nd同位素地球化学及其成因探讨
其他题名	Trace elements and Sr-Nd isotopic geochemistry and genesis of Jijie alkaline-ultramafic rocks, southern part of Panxi rift
	赵正; 漆亮; 黄智龙; 严再飞; 许成
	2012
发表期刊	岩石学报
卷号	28 期号:6 页码:1915-1927
其他摘要	The Jijie alkaline complex is located in the southern part of Panxi rift, Yunnan Province. Jijie alkaline-ultramafic rocks complex body mainly is composed of melteigites, ijolites and urtites. They all have similar primitive mantle-normalized trace element spider diagram and REE (Rare Earth Element) patterns. The complex show relative enrichment of large-ion lithophile, such as K, Rb, Sr, Ba and relatively low contents of Sc, Cr and Ni. The Nb/Ta and Zr/Hf ratios are spread within the range of mantle-droved rocks. Sr and Nd isotope distribute along the "mantle array". Whereas, the contents of all the incompatible elements are relatively lower than OIB (Ocean Island Basalts) and other alkaline rocks, and comparable with E-MORB (Enriched-Mid Ocean Ridge Basalts). The low contents of Sigma REE = 32.86 similar to 70.07, (La/Yb)N = 3.03 similar to 4.47 and strongly negative HREE, suggest that the peridotite mantle source have garnet residual and depleted incompatible elements. The primitive magma of Jijie alkaline-ultramafic rocks was underwent low-degree (<10%) partial melt at high pressure, mainly experienced olivine, clinopyroxene and a slight magnetite crystal fractionation during the magma evolution. Melteigite, ijolite and urtite were derived from the same mantle source. The depleted mantle source of Jijie alkaline-ultramafic rocks may be related to the large volumes of Emeishan basalt magmas droved from mantle during Middle-Late Permian in this area. As the multi-stage activities of Paxnxi rift has provide a channel for Emeishan mantle plume, the alkaline magma originated from the lithosphere mantle or mixed mantle low degree partial melting during the early or late stages of Emeishan mantle plume activity invaded along Panxi rift.
学科领域	矿床地球化学
语种	中文
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/4833
专题	矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文矿床地球化学国家重点实验室
推荐引用方式 GB/T 7714	赵正,漆亮,黄智龙,等. 攀西裂谷南段鸡街碱性超基性岩微量元素和Sr-Nd同位素地球化学及其成因探讨[J]. 岩石学报,2012,28(6):1915-1927.
APA	赵正,漆亮,黄智龙,严再飞,&许成.(2012).攀西裂谷南段鸡街碱性超基性岩微量元素和Sr-Nd同位素地球化学及其成因探讨.岩石学报,28(6),1915-1927.
MLA	赵正,et al."攀西裂谷南段鸡街碱性超基性岩微量元素和Sr-Nd同位素地球化学及其成因探讨".岩石学报 28.6(2012):1915-1927.

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