U–Pb zircon, geochemical and Sr–Nd–Hf isotopic constraints on the age and origin of Early Palaeozoic I-type granite from the Tengchong–Baoshan Block, Western Yunnan Province, SW China

	U–Pb zircon, geochemical and Sr–Nd–Hf isotopic constraints on the age and origin of Early Palaeozoic I-type granite from the Tengchong–Baoshan Block, Western Yunnan Province, SW China
	Shen Liu; RuiZhong Hu; Shan Gao; CaiXia Feng; Zhilong Huang; Shaocong Lai; Honglin Yuan; Xiaoming Liu; Ian M. Coulson; Guangying Feng; Tao Wang; YouQiang Qi
	2009
发表期刊	Journal of Asian Earth Sciences
卷号	36 期号:2-3 页码:168-182
合作性质	其它
其他摘要	Herein we present new U–Pb zircon ages, whole-rock geochemical data and Nd–Sr–Hf isotopic data for an Early Palaeozoic monzogranite batholith from the Tengchong–Baoshan Block, Western Yunnan Province,China. Mineralogical and geochemical features suggest that this granitoid is a high-K, calc-alkaline, I-type granite. SHRIMP and laser ablation ICP-MS (LA-ICP-MS) analysis of zircon yields ages of between 499 ± 5 Ma and 502 ± 5 Ma, for three samples from the batholith. The monzogranite is characterised by high initial 87Sr/86Sr (0.7132–0.7144), negative eNd(t) ( 9.7 to 9.40) and eHf(t) ( 10 to 13.1), and is interpreted to derive from remelting of pre-existing Palaeoproterozoic, high-K, metabasaltic rocks of the upper crust. The granitoid magma underwent extensive fractional crystallisation of biotite ± hornblende,ilmenite, titanite, K-feldspar and plagioclase during emplacement. The crystallisation temperature of the magma lies in the range 633–733 C, however, there is no evidence to suggest crustal assimilation occurred during its ascent. Like the 500 Ma, I-type granite of this study, there occur numerous granitoid rocks of Early Palaeozoic age (490–470 Ma) in adjacent regions across the entire Tengchong–Baoshan Block (Chen et al., 2004, 2005; Song et al., 2007). This episode of plutonism is coeval with the widespread granitoid magmatism found throughout the Indian Plate and the Himalayan Orogenic Belt that are both subordinate parts of the ancient, Gondwana supercontinent. We infer, therefore,that the Tengchong–Baoshan Block may also have formed part of Gondwana, and that it separated from this supercontinent along with other crustal blocks during the Late Palaeozoic. Moreover, based on the findings of this study, we document the occurrence of arc-related magmatism in the Tengchong–Baoshan Block during the late Palaeoproterozoic.
关键词	Granite U–pb Zircon Age Geochemistry Sr–nd–hf Isotopes Early Palaeozoic Western Yunnan Province
学科领域	矿床地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/3086
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	Shen Liu,RuiZhong Hu,Shan Gao,等. U–Pb zircon, geochemical and Sr–Nd–Hf isotopic constraints on the age and origin of Early Palaeozoic I-type granite from the Tengchong–Baoshan Block, Western Yunnan Province, SW China[J]. Journal of Asian Earth Sciences,2009,36(2-3):168-182.
APA	Shen Liu.,RuiZhong Hu.,Shan Gao.,CaiXia Feng.,Zhilong Huang.,...&YouQiang Qi.(2009).U–Pb zircon, geochemical and Sr–Nd–Hf isotopic constraints on the age and origin of Early Palaeozoic I-type granite from the Tengchong–Baoshan Block, Western Yunnan Province, SW China.Journal of Asian Earth Sciences,36(2-3),168-182.
MLA	Shen Liu,et al."U–Pb zircon, geochemical and Sr–Nd–Hf isotopic constraints on the age and origin of Early Palaeozoic I-type granite from the Tengchong–Baoshan Block, Western Yunnan Province, SW China".Journal of Asian Earth Sciences 36.2-3(2009):168-182.

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