Magma source and evolution law in Yueshan ore field, Anhui Province, China

Abstract

Major elements, trace elements and sulfur, oxygen isotopic compositions of the main intrusions were studied in Yueshan area. The fact that intrusions enriched in Th and Sr, and depleted in Rb and Ba in this area, suggests that the original magma roots in alkali basalt magma of upper mantle, with deep characteristics. It can be seen that the diagenesis environments are the island arc and active continental margin areas from the lg τ to lg σ diagram of intrusions. With the increase of SiO₂, Fe₂O₃, MnO and P₂O₅ decrease, which shows that the magma of Yueshan area endured crystal fractionation of ferromanganese mineral and apatite in early evolution stage. With the further rise and evolution of magma, magma composition of calcium increased, meanwhile enriched in Zr, and depleted in Nb and Ta. This indicates that crustal component is gradually added, the assimilation and contamination occur between magma and crustal material, which includes the magma evolving, from calc-alkaline series to alkaline series. The results show that crystal fractionation, assimilation and contamination are the main evolution law of magma in this area.

Keywords

lithochemistry / geochemistry / magma source / magmatic evolution / Yueshan area

References

[1] ChangY-f, LiuX-p, WuY-changThe copper, iron mineralization belt in the middle and lower reaches of the Yangzi River area [M], 1991, Beijing, Geological Publishing House: 294-312

[2] ZhouT-f, ZhaoY, DuJ-g, YueS-cang. PER analysis of magmatic evolution of intrusions in Yueshan Orefield, Anhui Province [J]. Journal of Hefei University of Technology, 2000, 23(1): 68-72

[3] DongS-w, QiuR-longTectonism and magmatism in Anqing-Yueshan area [M], 1993, Beijing, Geological Publishing House: 1-158

[4] ZhouT-f, YueS-c, YuanFengLithogenesis and mineralization in Yueshan [M], 2005, Beijing, Geological Publishing House: 1-146

[5] YuanF, ZhouT-f, LiuX-d, YueS-cang. Geochemistry of rare earth elements of anqing copper deposit in Anhui Province [J]. Journal of Rare Earths, 2002, 3: 64-68

[6] YangG-s, WenH-j, HuR-z, YuW-x, FanH-feng. Petro-geochemical characteristics and genesis of Yueshan intrusion, Anhui province [J]. ACTA Mineralogica Sinica, 2007, 27(3/4): 406-413

[7] ZhangZ-y, DuY-s, XiangW-s, TengC-y, LongW-s, DongY-c, LiX-lian. Genesis of Anqing copper-iron deposit, Anhui Province: Constraints from mineral deposit geology and element geochemistry [J]. Acta Petrologica Sinica, 2012, 28(11): 3739-3756

[8] PanY-m, DongPing. The lower Changjiang (Yangzi/Yangtze River) metallogenic belt, east central China: Intrusion-and wall rock-hosted Cu-Fe-Au, Mo, Zn, Pb, Ag deposits [J]. Ore Geology Reviews, 1999, 15(4): 177-242

[9] ZhangL-j, ZhouT-f, FanYu. SHRIMP U-Pb zircon dating of Yueshan intrusion in the Yueshan ore field Anhui, and significance [J]. Acta Petrologica Sinica, 2008, 24(8): 1725-1732

[10] LiuY-y, MaC-q, ZhangC, SheZ-i, ZhangJ-yang. Petrogenesis of Yueshan Pluton: Zircon U-Pb dating and Hf isotope evidence [J]. Geological Science and Technology Information, 2009, 28(5): 22-30

[11] LiB, ChenJ-f, ZhengY-f, ZhaoZ-f, QianHui. Relationship among oxygen isotope, Rb-Sr isochron and mineral alteration in quartz diorite at Yueshan in Anhui [J]. Acta Petrologica Sinica, 2004, 20(5): 1185-1192

[12] ZhouT-f, YueS-cang. Studies on relationships between lithogenesis and mineralization in Yueshan [J]. Volcanology and Mineral Resources, 1995, 162: 55-66

[13] ZhangL-j, ZhouT-f, FanY, YuanFeng. Petrogenetic-metallogenetic setting and temporal-spatial framework of the Yueshan district, Anhui Province, east-central China [J]. International Geology Review, 2011, 53(5/6): 542-561

[14] LiuZ-f, ShaoY-j, ShuZ-m, ZhangYu. Rock-forming mechanism of Yueshan intrusion, Tongling, Anhui Province, China [J]. Chinese Journal of Nonferrous Metals, 2012, 22(3): 652-659

[15] ZhouT-f, YuanF, YueS-c, YuanF, YangW-p, HeL-x, YueS-cang. Geochemistry and evolution of ore-forming fluids of the Yueshan Cu-Au skarn- and vein-type deposits, Anhui Province, South China [J]. Ore Geology Reviews, 2007, 31(1/2/3/4): 279-303

[16] LiuZ-f, ShaoY-j, ShuZ-m, PengN-h, XieY-l, ZhangYu. Fluid inclusion characteristics of Longmenshan copperpolymetallic deposit in Yueshan, Anhui Province, China [J]. Journal of Central South University, 2012, 19(9): 2627-2633

[17] LiuL-m, ZhaoY-l, ZhaoC-bin. Coupled geodynamics in the formation of Cu skarn deposits in the Tongling-Anqing district, China: Computational modeling and implications for exploration [J]. Journal of Geochemical Exploration, 2010, 106(1/2/3): 146-155

[18] LiuL-m, ZhouR-c, ZhaoC-bin. Constraints of tectonic stress regime on mineralization system related to the hypabyssal intrusion: Implication from the computational modeling experiments on the geodynamics during cooling process of the Yuenshan intrusion in Anqing district, China [J]. Acta Petrologica Sinica, 2010, 26(9): 2869-2878

[19] LiuL-m, WanC-b, ZhaoC-bin. Geodynamic constraints on orebody localization in the Anqing orefield, China: Computational modeling and facilitating predictive exploration of deep deposits [J]. Ore Geology Reviews, 2011, 43(1): 249-263

[20] LiuL-m, ZhaoY-l, SunTao. 3D computational shape- and cooling process-modeling of magmatic intrusion and its implication for genesis and exploration of intrusion-related ore deposits: An example from the Yueshan intrusion in Anqing, China [J]. Tectonophysics, 2012, 526-529: 110-123

[21] WuG-g, ZhangD, DiY-j, ZangW-s, ZhangX-x, SongB, ZhangZ-yi. The SHRIMP zircon U-Pb age of intrusion and its deep geodynamic setting in Tongling ore concentrated area [J]. Science in China (Series D), 2008, 38(5): 630-645

[22] ZhouT-f, YueS-cang. Forming conditions and mechanism for the fluid ore-forming system of the copper, gold deposits in the Middle and Lower reaches of the Yangtze River area [J]. Acta Scientiarum Naturalium Universitatis Pekinensis, 2000, 36(5): 697-707

[23] HuaR-m, MaoJ-wen. A prelimineray discussion on the mesozoic metallogenic explosion in east China [J]. Mineral Deposits, 1999, 18(4): 300-307

[24] MaoJ-w, ZhangZ-h, YuJ-j, WangY-t, NiuB-gui. Geodynamic background of mesozoic large-scale metallization in Northern China and neighboring area: Implications from age of metal deposits [J]. Science in China (Series D), 2003, 33(4): 289-299

[25] BrownG C, ThorpeR S, WebbP C. The geochemical characteristics of granitoids in contrasting arcs and comments on magma sources [J]. Journal of the Geological Society, 1984, 141(3): 413-426

[26] ChenJ-feng. ⁴⁰Ar/³⁹Ar ages and the related metallogenic epoch of Yueshan intrusion in Anhui province [J]. Geoscience, 1991, 51: 1-19

[27] ZhouT-f, YueS-c, YuanF, LiuX-d, ZhaoYong. A discussion on petrological characteristics and genesis of Yueshan intrusion, Anhui Province [J]. Geological Journal of China Universitie, 2001, 7(1): 70-80

[28] ZhouT-f, YueS-cang. Isotope geochemistry of copper mineralization in Yueshan, Anhui [J]. Mineral Deposits, 1996, 15(4): 341-350

[29] QiuR-long. Petrological characteristic and genesis of high-K diorites in Yueshan, Anhui Province [J]. Geological Review, 1992, 38(2): 97-108

[30] ShenW-z, HuangY-shengStable isotope geochemistry [M], 1987, Beijing, Atomic Energy Publishing Houses: 1-181

[31] TaylorH P. Oxygen and hydrogen isotope studies of plutonic granitic rocks, Earth and Planet [J]. Sci Lett, 1978, 38: 177