Discovery of the Late Silurian volcanic rocks in the Dazhonghe area, Yunxian-Jinggu volcanic arc belt, western Yunnan, China and its geological significance

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	Discovery of the Late Silurian volcanic rocks in the Dazhonghe area, Yunxian-Jinggu volcanic arc belt, western Yunnan, China and its geological significance
	Mao, XC (Mao XiaoChang); Wang, LQ (Wang LiQuan); Li, B (Li Bing); Wang, BD (Wang BaoDi); Wang, DB (Wang DongBing); Yin, FG (Yin FuGuang); Sun, ZM (Sun ZhiMing)
刊名	ACTA PETROLOGICA SINICA
	2012
卷号	28 期号:5 页码:1517-1528
关键词	Yunxian-Jinggu volcanic arc Late Silurian volcanic rocks Paleo-Tethys ocean Dazhonghe area
ISSN号	1000-0569
英文摘要	A suit of Early Paleozoic volcanic rocks was recognized from Dazhonghe area in Yunxian-Jinggu volcanic arc belt. LA-ICPMS U-Pb zircon analyses suggest that the volcanic rocks was dated at 421. 3 +/- 2. 3Ma and 418. 8 +/- 3. 5Ma. The volcanic rocks belong to calc-alkaline serie rocks, with characterized by high Al2O3(12. 73% similar to 16. 63%), Na2O (K2O/Na2O = 0. 56 similar to 0. 99) and high Mg-# (46. 0 similar to 50. 0). Furthermore, they are similar to island arc volcanic rocks of active continental margin, with characterized by enrichment of LREE, weak negative anomaly of Eu, strong negative anomalies of HFSE (Nb, Ta, Ti), positive epsilon(Nd) (t) (3. 86 similar to 4. 39) and high Th/Ta (15 similar to 17). The Late Silurian volcanic rocks in Dazhonghe area were probably generated by fractional crystallization of parent magma or assimilation of shallow crustal materials in the process of magma ascent, which partial melting of the depleted mantle wedge by metasomatism with subduction deposit. Being study in combination with the regional magmatic activities and high-metamorphic events during the same period (410 similar to 420Ma), we suggest that the island arc volcanic rocks were resulted from the eastward subduction of Paleo-Tethys ocean, which provide direct petrology evidences of forward arc and its dynamic mechanism for the formation and evolution of the Late Paleozoic Sanjiang multi-island-arc basin system in the western edge of the Yangtze block.
学科主题	火成岩岩石学
WOS关键词	TRACE-ELEMENTS ; PROVINCE ; CRUST
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000304784400014
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39512]
专题	中国地质调查局
作者单位	Yunnan Inst Geol Survey, Kunming 650011, Peoples R China
推荐引用方式 GB/T 7714	Mao, XC ,Wang, LQ ,Li, B ,et al. Discovery of the Late Silurian volcanic rocks in the Dazhonghe area, Yunxian-Jinggu volcanic arc belt, western Yunnan, China and its geological significance[J]. ACTA PETROLOGICA SINICA,2012,28(5):1517-1528.
APA	Mao, XC .,Wang, LQ .,Li, B .,Wang, BD .,Wang, DB .,...&Sun, ZM .(2012).Discovery of the Late Silurian volcanic rocks in the Dazhonghe area, Yunxian-Jinggu volcanic arc belt, western Yunnan, China and its geological significance.ACTA PETROLOGICA SINICA,28(5),1517-1528.
MLA	Mao, XC ,et al."Discovery of the Late Silurian volcanic rocks in the Dazhonghe area, Yunxian-Jinggu volcanic arc belt, western Yunnan, China and its geological significance".ACTA PETROLOGICA SINICA 28.5(2012):1517-1528.