Tectonic Environment and Geochemical Characteristics of Geza Arc Magmatic Rocks in Sanjiang Orgenic Belt, SW China

Abstract:

Geza island arc located in the southwest Sanjiang tectonic igneous rock belts, it was a products of Ganzi-Litang oceanic crust diving to Zhongdian Landmasses in late Triassic and a important of newly discovered copper polymetallic belts in the recent years in China. The regional strong tectonic-magmatic activity throughout the island-arc orogenesis from beginning to the end, the rich mineralization developed in the different times and different circumstances. Based on the development stage of island arc orogenic,the distribution of intrusive rocks, rocks composition, geochemical characteristics, Geza island arc granit belt can be divided into three belts. Lithogeochemical characteristics show that the porphyry (porphyrite) and island-arc granite rocks have the same rock series (high-K calc-alkaline) and the same genetic type (I-type granite); these rocks trace elements very similar to granite of island arc, which enriched in Ba, La, Hf, Au,chalcophile elements Cu,Pb, siderophile elements Mo, Ni, and depleted in Rb, Nb, P, Ti.

• Periodical: Advanced Materials Research (Volumes 734-737)
• Pages: 444-447
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.734-737.444
• Online since: August 2013
• Authors: Xue Long Liu, Wen Chang Li, Yan Yang, Guang Hou Yin
• Keywords: Arc Magmatic Rocks, Geza, Mineralization, Porphyry Copper Deposits, Yunnan

References

[1] Cao D.H. Wang A.J. Xiu Q.X.,et al. Geochemical Characteristics of Bengge Syenites in the Zhongdian Area,Yunnan Province and Its Geological Significance. Acta Geologica Sinic Vol.81(2007), p.995−1003

[2] Hou Z.Q. and Mo X.X.1991.The evolution of Yidun island—arc and implication in the exploration of Kuroko-type VMS deposits inSanjiang Region,China.Earth Science Vol.16(1991), p.153−164

[3] Ren JB, Xu JF, Chen JL, et al. Geochemistry and petrogenesis of Pulang porphyries in Sanjiang region. Acta Petrological Mineralogical Vol. 30(2011), p.581−592

[4] Li W.C. The Tectonic evolution of the Yidun island arc and the metallogenic model of the Pulang porphyry copper deposit,Yunnan, SW China.Doctorial These (2007)

[5] Li W.C. Ying G.H.,Yu H.J., et al. The porphyry metallogenesis of Geza volcanic magmatic arc in NW Yunnan. Acta petrologica Sinica Vol.27(2011), p.2541−2552

[6] Liu X.L., Li W.C. Yin G.H.,et al. The Indo-Chinese Epoch Arc Magmatism of Geza Island-Arc and Porphyry Copper Mineralization in Pulang Sanjiang Orogenic Belt, Southwest China. Acta Geologica sinica Vol.86(2012), p.1933−(1945)

DOI: 10.1111/1755-6724.13088

[7] Xu X.W. Chai X.P.,Qu W.J.,et al. Later Cretaceous granitic porphyritic Cu-Mo mineralizaton system in the Hongshan Area,northwestem Yunnan and its Significances for tectonics, Acta Geologica sinica Vol.80(2006), p.l422−1433.

[8] Yang Y.Q., Hou Z.Q., Huang D.H.,et al. Collision Orogenic Process and Magmatic Metallogenic System in Zhongdian Arc. Acta Geosicientia Sinica Vol.23(2002), p.17−24

[9] Zeng P.S.,Mo,X.X.,Yu,X.Z.,et al. Porphyries and Porphyry Copper Deposits in Zhongdian Area, Northwestern Yunnan. Mineal Deposits Vol.22(2003), p.393−400

[10] Zeng P.S.,Li,W.C. Wang H.P.,et al. The indosinian Pulang soperlarge porphyry copper deposit in Yunnan,China:petrology and chronology. Acta Petrology Sinica Vol.22(2006) , p.989−1000