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| Plagioclase Crystal Populations of the Granodiorite in the Jiaqi-style Porphyry Cu-Mo Deposit, Eastern Kunlun Orogen, Qinghai, and their Metallogenic Implications |
| LUO Zhao-hua1, GUO Jing1, HEI Hui-xin1, WANG Bing-zhang2, WANG Tao2 |
1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;
2. Qinghai Geological Survey Institute, Xining 810012, China |
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Abstract In recent years, more and more researchers accept the opinion that igneous rocks are composed of crystal populations. In this article, taking the granodiorite in the Jiaqi-style porphyry Cu-Mo deposit, Eastern Kunlun orogen, as an example, we attempt to clarify the content of the term "crystal population", and indroduce the methodology and implications for studying crystal populations. The petrography and CL images indicate that plagioclase grains in the granodiorite can be subdivided into five types. Chemical variation across the plagioclase crystal grains by EMPA further suggests that these five types of crystals have crystallized in different conditions and processes so that they are of different crystal populations. According to principles of the equilibrium thermodynamics, the five crystal populations are likely to be derived from five different magma subsystems, which suggests that the parental magmas are the product of magma mixing of a multiple chamber system. The mixing magmas must have experienced a quickly solidification process. The new insights are important for revealing origin of the porphyry deposits.
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Alexander R C. 1998. On the emplacement of tabular granites. Journal of the Geological Society, 155(5): 853-862
|
|
Charlier B L A, Wilson C J N, Lowenstern J B, Blake S, Van CALSTEREN P W, Davidson J P. 2005. Magma generation at a large, hyperactive silicic volcano (Taupo, New Zealand) revealed by U-Th and U-Pb systematics in zircons. Journal of Petrology, 46(1): 3-32
|
|
Cheng L L, Yang Z F, Zeng L, Wang Y, Luo Z H. 2014. Giant plagioclase growth during storage of basaltic magma in Emeishan Large Igneous Province, SW China. Contributions to Mineralogy and Petrology, 167(2): 971, doi: 10.1007/s00410-014-0971-0
|
|
Davidson J P, Morgan D J, Charlier B L A, Harlou R, Hora J. 2007. Tracing magmatic processes and timescales through mineral-scale isotopic data. Annual Reviews of Earth and Planetary Sciences, 35(1): 273-311
|
|
Deer W A, Howie R A, Zussman J. 2001. Framework silicates: feldspars. 2nd ed. London: The Geological Society, 972
|
|
Gill J, Reagan M, Tepley F, Malavassie E. 2006. Arenal Volcano. Costa Rica: Magma Genesis and Volcanology Processes, 157: 1-8
|
|
Ingebritsen S E, Manning C E. 2010. Permeability of the continental crust: Dynamic variations inferred from seismicity and metamorphism: Geofluids, 10(1-2): 193-205
|
|
Morse S A. 1984. Cation diffusion in plagioclase feldspar. Science, 225(4661): 504-505
|
|
Rutherford M J. 2008. Magma ascent rates. Reviews in Mineralogy and Geochemistry, 69(1): 241-271
|
|
黑慧欣, 罗照华, 李德东, 潘颖, 杨宗锋, 周久龙. 2015a. 宽成分谱系岩墙群的岩石成因及其构造与成矿意义. 地质通报, 34(2-3): 229-250
|
|
李世金, 孙丰月, 高永旺, 赵俊伟, 李连松, 杨启安. 2012. 小岩体成大矿理论指导与实践—青海东昆仑夏日哈木铜镍矿找矿突破的启示及意义. 西北地质, 45(4): 184-191
|
|
Burgisser A, Bergantz G W, Breidenthal R E. 2005. Addressing complexity in laboratory experiments: the scaling of dilute multiphase flows in magmatic systems. Journal of Volcanology and Geothermal Research, 141(3-4): 245-265
|
|
Marsh B D. 1996. Solidification fronts and magmatic evolution. Mineralogical Magazine, 60(1): 5-40
|
|
Martin R F. 2012. The petrogenesis of anorogenic felsic magmas and AMCG suites: Insights on element mobility and mutual cryptic contamination from polythermal experiments. Lithos, 151: 35-45
|
|
Rothstein D A, Manning C E. 2003. Geothermal gradients in continental magmatic arcs: Constraints from the eastern Peninsular Ranges batholith, Baja California, México. Geological Society of America, Special Paper, 374: 337-354
|
|
Waters L E, Andrews B J, Lange R A. 2015. Rapid crystallization of plagioclase phenocrysts in silicic melts during fluid-saturated ascent: Phase equilibrium and decompression experiments. Journal of Petrology, 56(5): 981-1006
|
|
Zellmer G F, Annen C. 2008. An introduction to magma dynamics. In: Annen C, Zellmer G F, eds. Dynamics of Crustal Magma Transfer, Storage and Differentiation. Geological Society, London, Special Publications, 304: 1-13
|
|
黑慧欣, 罗照华, VIKENTYEV I V, 郭晶. 2015b. 透岩浆流体作用与矿田构造. 地质力学学报, 21(1): 1-12
|
|
刘显凡, 蔡永文, 卢秋霞, 陶专, 赵甫峰, 蔡飞跃, 李春辉, 宋祥峰. 2010. 滇西地区富碱斑岩中地幔流体作用踪迹及其成矿作用意义. 地学前缘, 17(1): 114-136
|
|
刘小丽, 程素华, 张宏远. 2015. 花岗质岩浆的变压结晶作用及其动力学意义: 以北京房山岩体为例. 现代地质, 29(3): 514-528
|
|
罗照华, 卢欣祥, 陈必河, 李明立, 梁涛, 黄凡, 杨宗锋. 2009a. 透岩浆流体成矿作用导论. 北京: 地质出版社, 1-177
|
|
Gary M, Mcafee J R R, Wolf C L. 1973. Glossary of Geology. Washington D C: American Geological Institute, 424
|
|
Sillitoe R H. 2010. Porphyry copper systems. Economic Geology, 105(1): 3-41
|
|
罗照华, 卢欣祥, 郭少丰, 孙静, 陈必河, 黄凡, 杨宗锋. 2008. 透岩浆流体成矿体系. 岩石学报, 24(12): 2669-2678
|
|
罗照华, 李德东, 潘颖, 黄丹峰, 梁涛. 2009b. 中国东部黄山的成山过程及其构造意义. 地学前缘, 16(3): 250-260
|
|
莫宣学, 罗照华, 邓晋福, 喻学惠, 刘成东, 谌宏伟, 袁万明, 刘云华. 2007. 东昆仑造山带花岗岩及地壳生长. 高校地质学报, 13(3): 403-414
|
|
王秉璋, 罗照华, 吴正寿, 祁生胜, 王毅志, 拜永山. 2014. 祁漫塔格地质走廊域古生代-中生代火成岩岩石构造组合研究. 北京: 地质出版社, 230
|
|
吴平霄, 吴金平, 李才伟, 肖文丁. 1998. 斜长石韵律环带的结晶速率方程及其动力学机制. 岩石学报, 14(3): 388-394
|
|
覃锋, 徐晓霞, 罗照华. 2006. 北京房山岩体形成过程中的岩浆混合作用证据. 岩石学报, 22(12): 2957-2970
|
|
Baker D R. 1998. Granitic melt viscosity and dike formation. Journal of Structural Geology, 20(9-10): 1395-1404
|
|
Lange R A, Frey H M, Hector J. 2009. A thermodynamic model for the plagioclase-liquid hygrometer/thermometer. American Mineralogist, 94(4): 494-506
|
|
郭晶. 2017. 东昆仑祁漫塔格地区家琪斑岩Cu-Mo矿床的成因及定量靶区预测. 博士学位论文. 北京: 中国地质大学(北京)
|
|
罗照华, 周久龙, 黑慧欣, 刘翠, 苏尚国. 2014. 超级喷发(超级侵入)后成矿作用. 岩石学报, 30(11): 3131-3154
|
|
Jerram D A, Martin V M. 2008. Understanding crystal populations and their significance through the magma plumbing system. In: Annen C, Zellmer G F, eds. Dynamics of Crustal Magma Transfer, Storage and Differentiation. Geological Society, London, Special Publications, 304: 133-148
|
|
郭晶, 罗照华, 刘晓, 姜会营. 2013. 利用宽谱系岩墙群进行靶区定位的数值方法:以新疆南阿拉套山为例. 中国地质, 40(2): 423-429
|
|
罗照华, 杨宗锋, 代耕, 程黎鹿, 周久龙. 2013. 火成岩的晶体群与成因矿物学展望. 中国地质, 40(1): 176-181
|
|
|
|
