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	Zircon u-pb geochronology and geochemistry of ore-bearing porphyries in the southern yulong porphyry copper belt, and factors resulting in the differences in scale of mineralization between the southern and northern yulong porphyry copper belt
	Chen XiLian1,2; Huang WenTing1; Zou YinQiao1,2; Liang HuaYing1; Zhang Jian1,2; Zhang YuQuan1
刊名	Acta petrologica sinica
	2016-08-01
卷号	32期号:8页码:2522-2534
关键词	Porphyry copper deposit Zircon age Geochemical characteristics Yulong porphyry copper belt Eastern tibet
ISSN号	1000-0569
通讯作者	Chen xilian(392489631@qq.com)
英文摘要	The yulong porphyry copper belt located in eastern tibet is one of the most important porphyry copper belts formed in post-collisional setting in china. it is about 300km in length and consists of one giant, two large and two medium-sized porphyry copper deposits, as well as a series of small-sized porphyry deposits ( occurrences). the giant and large porphyry copper deposits occurred mainly in the northern yulong porphyry copper belt while the small-sized deposits or ore occurrences are found so far in the southern yulong porphyry copper belt. to understand the temporal and spatial evolution of the whole yulong porphyry copper belt more deeply and figure out the reasons why there are big differences in the scale of mineralization between the north and the south of the yulong porphyry copper belt, this paper analyzes the zircon la-icp-ms u-pb ages and geochemistry characteristics of the seli, the mamupu and the zongguo ore-bearing porphyries in the southern yulong porphyry belt, in addition to the zircon hf isotope composition of the seli porphyry. the seli, the mamupu and the zongguo porphyries associated closely with mineralization are monzongranite porphyry, syenite porphyry and quartz monzonite porphyry, respectively. the seli monzogranite porphyry, the mamupu syenite porphyry and the zongguo quartz monzonite porphyry have zircon la-icp-ms u-pb age of 39. 4 +/- 0. 2ma with mswd = 1. 10, 38. 5 +/- 0. 3ma with mswd =1. 79 and 39. 4 +/- 0. 2ma with mswd = 1. 05, respectively. the ore-bearing porphyries are metaluminous and characterized by enrichment in alkali with high k2o/na2o ratio ( k2o/na2o = 1. 2 2. 4), lree and lile, depleted in hfse, as well as weak negative eu anormaly. all the three porphyries contain hornblende phenocrysts and have high sr/y ratios, suggesting that their primary melts are water-rich. in situ zircon hf isotopic composition of the seli monzongranite porphyry shows epsilon(hf)(t) values ranging from -2.7 to 2. 8 with the average of -0.4, which indicates the source area is a mixture of continental crust and mantled-derived material, and these epsilon(hf)( t) values are obviously lower than those ( with an average of 4. 2) of the yulong giant porphyry copper deposit. the forming ages of ore-bearing porphyries in the southern yulong porphyry copper belt are similar to those in the northern ore belt and the formation of the yulong porphyry copper belt is genetically related to the activities of large-scale strike-slip fault systems triggered by the continental collision of india with asia. the epsilon(hf)(t) values of ore-bearing porphyry in yulong giant deposit are higher than that of seli small deposit which implies that the scale of porphyry copper deposit is related to the content of mantle-derived materials involved in the source of magma, and the more mantle-derived materials involve, the better for the formation of large scale porphyry copper deposit it will be. the differences of ore size between the southern and northern yulong porphyry copper belt are probably due to that the porphyries in the northern area derived from the sources with more contribution from mantle or juvenile crust.
WOS关键词	ABLATION-ICP-MS ; EASTERN TIBET ; HF ISOTOPE ; OXIDIZED MAGMAS ; CU DEPOSITS ; SE CHINA ; LU-HF ; MANTLE ; PETROGENESIS ; CONSTRAINTS
WOS研究方向	Geology
WOS类目	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000383309100020
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2375985
专题	中国科学院大学
通讯作者	Chen XiLian
作者单位	1.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou 510640, Guangdong, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Chen XiLian,Huang WenTing,Zou YinQiao,et al. Zircon u-pb geochronology and geochemistry of ore-bearing porphyries in the southern yulong porphyry copper belt, and factors resulting in the differences in scale of mineralization between the southern and northern yulong porphyry copper belt[J]. Acta petrologica sinica,2016,32(8):2522-2534.
APA	Chen XiLian,Huang WenTing,Zou YinQiao,Liang HuaYing,Zhang Jian,&Zhang YuQuan.(2016).Zircon u-pb geochronology and geochemistry of ore-bearing porphyries in the southern yulong porphyry copper belt, and factors resulting in the differences in scale of mineralization between the southern and northern yulong porphyry copper belt.Acta petrologica sinica,32(8),2522-2534.
MLA	Chen XiLian,et al."Zircon u-pb geochronology and geochemistry of ore-bearing porphyries in the southern yulong porphyry copper belt, and factors resulting in the differences in scale of mineralization between the southern and northern yulong porphyry copper belt".Acta petrologica sinica 32.8(2016):2522-2534.

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