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矿床地质  2005 

赤峰陈家杖子隐爆角砾岩型金矿床地质地球化学特征与成因

Keywords: 地球化学,金矿床,隐爆角砾岩,成矿作用,陈家杖子,赤峰,内蒙古

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Abstract:

家杖子金矿是赤峰南部地区新发现的隐爆角砾岩型金矿床,矿体呈脉状产于隐爆角砾岩筒内,角砾岩筒主要由隐爆含角砾岩屑晶屑凝灰岩组成。角砾岩筒蚀变强烈,并具一定的蚀变分带,金矿化主要与硅化和冰长石化有关,载金矿物主要为毒砂。含矿岩石的岩石化学特征为铝过饱和型,以w(K2O)>>w(Na2O)为特征,属于钙碱性系列I型花岗岩;稀土元素特征表现为轻稀土元素富集型,有Eu亏损;微量元素具有明显的Ti、Nb、Sr、Ba、Th、U亏损,K富集,与大陆边缘正常弧非成熟花岗岩的微量元素特征相符。石英内流体包裹体均一温度表明,金成矿作用主要发生在150~180℃、225~390℃温度段,估算成矿压力为72×105~158×105Pa(255~560m)。矿石硫同位素组成稳定,δ34SV-CDT变化范围为5.3‰~9.4‰。矿石铅与含矿角砾岩的铅同位素组成相似,μ值分别为7.89~8.16及7.89~8.08,模式年龄为591~622Ma和478~912Ma;在Z-D演化模式图上,岩(矿)石铅投影于上地幔与下地壳演化线之间。含矿角砾岩和二长花岗斑岩脉的ISr为0.70820~0.70118,εSr(t)为50.64~106.8,143Nd/144Nd(t)为0.511819~0.512001,εNd(t)为-7.99~-11.62,具有大陆地壳特征。tCHUR及tDM值与该区晚中生代玄武岩、安山岩一致,而不同于印支期闪长岩及其下地壳麻粒岩包体。硫、铅、锶、钕同位素特征显示,成矿物质具壳幔混源特点。主要含矿角砾岩的Rb_Sr同位素等时线年龄为191Ma,两期隐爆角砾岩之间侵入的二长花岗斑岩脉的等时线年龄为177Ma。陈家杖子金矿应为与早燕山期隐爆角砾岩有关的浅成中_低温热液型金矿床。

References

[1]  Wang B D and Li S R. 1996. The geological and geochemical characteristics of the explosive breccia-type gold deposit of Qiyugou, Henan[J]. Geology and Geochemistry, 6: 37~45 (in Chinese with English abstract).
[2]  Wang S Q, Sun C Z, Cui W Y, et al. 1994. Geology of the gold deposits in Chifeng, Inner Mongolia[M]. Hohhot: People Publishing House of Inner Mongolia (in Chinese).
[3]  Wang Z. 2004. Geological characteristics and its indication for mineral prospecting of Chenjiazhangzi cryptoexplosive breccia-type gold deposit, Inner Mongolia[J]. Geology in China, 31(2): 206~212 (in Chinese with English abstract).
[4]  Zartman R E and Doe B R. 1991. Plumbtectonics: the model[J]. Tectonophysics, 75 (1-2): 135~162.
[5]  Zhang L G, et al. 1995. Block-geology of eastern Asia lithosphere-isotope geochemistry and dynamics of upper mantle, basement and granite[M]. Beijing: Science Press (in Chinese with English abstract).
[6]  Zhou X H, Chen Y X, Zhang G H, et al. 1998. Isotopic restriction to the origin of Mesozoic volcanic rocks, in the north margin of North China Plate[J]. China Science Bulletin, 43(23): 2483~2488 (in Chinese).
[7]  Zhou X H, Zhang G H, Yang J H, et al. 2001. Sr-Nd-Pb isotope mapping in the northern margin of North China Plate and its tectonic implications[J]. Geochemistry, 31(1): 10~23 (in Chinese with English abstract).
[8]  韩庆军, 邵济安, 周瑞. 1999. 内蒙古喀喇沁早中生代闪长岩的岩石学、地球化学及其成因[J]. 岩石学报, 16(3):385~391.
[9]  李延河, 丁悌平. 1990. 内蒙赤峰红花沟金矿稳定同位素研究[J]. 矿床地质, 9 (3): 257~269.
[10]  刘斌, 沈昆. 1998. 流体包裹体热力学[M]. 北京:地质出版社.
[11]  更多...
[12]  邵济安, 韩庆军, 张履桥, 牟保磊. 1999. 内蒙古东部早中生代堆积杂岩捕虏体的发现[J]. 科学通报, 44(5): 478~485.
[13]  佘宏全, 徐贵忠, 周瑞, 等. 2000. 内蒙古红花沟地区早中生代构造-岩浆活动及金成矿作用[J]. 现代地质, 14(4): 408-416.
[14]  内蒙古自治区赤峰地质调查院. 2002. 冀蒙相邻地区矿点检查及综合异常查证报告(内部资料).
[15]  Batchelor R A and Bowden P. 1985. Petrogenetic interpretation of granitoid rock series using multicationic parameters[J]. Chem. Geol., 48(1-4): 43~55.
[16]  Brown G C, Thoorpe R S and Webb P V. 1984. The geochemical characteristics of granitoids in contrasting arc and comments on magma source[J]. J. Geol. Soc. Lond., 141: 411~426.
[17]  Burnham. 1985. Energy release in subvolcanic environments: implications for breccia formation[J]. Econ. Geol., 80: 1515~1522.
[18]  Han Q J, Shao J A and Zhou R. 2000. Petrology, geochemistry and petrogenesis of Early Mesozoic diorites in Har-qin area, Inner Mongolia[J]. Acta Petrologica Sinica, 16(3): 385~391 (in Chinese with English abstract).
[19]  Harris N B W, Pearce J A and Tindle A G. 1986. Geochemical characteristics of collision-zone magmatism[A]. In: Coward M P and Reis A C., ed. Collision tectonics[C]. London: Spec. Pub. Geol. Soc., 19, 67~81.
[20]  Li Y H and Ding T P. 1990. Study on the stable isotope of Honghuagou gold deposit[J]. Mineral Deposits, 9(3): 257~269 (in Chinese with English abstract).
[21]  Liu B and Shen K. 1998. Thermodynamics on fluid inclusion[M]. Beijing: Geol. Pub. House (in Chinese).
[22]  Shao J A, Han Q J and Zhang L Q. 1999. The discovery of early Mesozoic accumulate complex xenolith and its geological implications in eastern Inner Mongolia[J]. Chinese Science Bulletin, 44(5): 478~485 (in Chinese).
[23]  She H Q, Xu G Z, Zhou R, et al. 2000. The tectonic and magmatic activities in early Mesozoic and their controlling on gold mineralization in Honghuagou gold field, Inner Mongolia[J]. Geoscience, 14(4): 408~416 (in Chinese with English abstract).
[24]  Taylor H P. 1974. The application of oxygen and hydrogen isotope studies to problems of hydrothermal alteration and ore deposit[J]. Econ. Geol., 69: 843~883.
[25]  王宝德, 李胜荣. 1996. 河南祁雨沟爆发角砾岩型金矿床地质地球化学特征初步研究[J]. 地质地球化学, 6:37~44.
[26]  王时麒, 孙承志, 崔文元, 等. 1994. 内蒙古赤峰地区金矿地质[M]. 呼和浩特: 内蒙古人民出版社.
[27]  王忠. 2004. 内蒙古陈家杖子隐爆角砾岩型金矿床地质特征与找矿方向[J]. 中国地质, 31(2):206-212.
[28]  张理刚, 等. 1995. 东亚岩石圈块体地质-上地幔、基底和花岗岩同位素地球化学及其动力学[M]. 北京:科学出版社.
[29]  周新华, 陈义贤, 张国辉, 等. 1998. 中生代火山岩源区特征的多元同位素制约-以华北北缘为例[J]. 科学通报, 43( 23): 2483~2488.
[30]  周新华, 张国辉, 杨进辉, 等. 2001. 华北克拉通北缘晚中生代火山岩Sr-Nd-Pb同位素填图及其构造意义[J]. 地球化学, 31(1):10~23.
[31]  佘宏全,张德全,等. 2004. 赤峰地区爆破角砾岩筒型金矿资源调查与评价. 中国地质科学院矿产资源研究所(研究报告).

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