南秦岭观花坪铜银矿床地质特征及找矿标志
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摘要
观花坪铜银矿床位处南秦岭成矿带中段,矿床产于下寒武-中奥陶统石瓮子组碳酸盐岩建造与中泥盆统大枫沟组碎屑岩建造"不整合接触界面"附近,区域上具明显的层控特征;但在矿区范围内,铜银矿体则严格受断裂破碎带控制,矿体均赋存于叠加在不整合面的断裂破碎带中,明显具后生成矿作用的特点。笔者通过对矿床地质特征、矿体地质特征和矿石特征的研究,结合区域地质背景的分析认为,铜银矿床为多期次多成矿阶段叠加形成的复杂矿床,特别是南秦岭华力西期与印支期—燕山期的构造-岩浆热事件与本区铜银矿床的形成关系密切。
Guahuaping copper and silver deposit occurs at unconformity contact zone of carbonate rock of Shiwongzi formation of Lower Cambrian-Middle Ordovician Series and clastic rock of Dafeng formation of Middle Devonian Series in south Qinling mineralization belt.Regionally the deposit is stratabound.In the deposit Cu-Ag ore bodies are strictly controlled by fault zones and they are all located in the cataclastic zones overprinting on the surface of the unconformity contact.The deposit is apparently epigenetic.Based on geological characteristics of the deposit and ore bodies and those of ores and regional background this deposit is a complex deposit formed in multi-stages and is closely related to Hercynian and Hindu-ChinaYanshanian tectonic-magmatic heat events taken place in south Qingling area.
Guahuaping copper and silver deposit occurs at unconformity contact zone of carbonate rock of Shiwongzi formation of Lower Cambrian-Middle Ordovician Series and clastic rock of Dafeng formation of Middle Devonian Series in south Qinling mineralization belt.Regionally the deposit is stratabound.In the deposit Cu-Ag ore bodies are strictly controlled by fault zones and they are all located in the cataclastic zones overprinting on the surface of the unconformity contact.The deposit is apparently epigenetic.Based on geological characteristics of the deposit and ore bodies and those of ores and regional background this deposit is a complex deposit formed in multi-stages and is closely related to Hercynian and Hindu-ChinaYanshanian tectonic-magmatic heat events taken place in south Qingling area.
引文
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[15]王鸿祯,徐成彦,周正国.东秦岭古海域两侧大陆边缘区的构造发展[J].地质学报,1982,56(3):270-279.
[16]钟建华.陕西秦岭泥盆系区域成矿大地构造演化[J].大地构造与成矿学,1997,21(3):242-250.
[2]杨志华,姜常义,赵太平,等.论秦岭造山带的成矿作用[J].西安工程学院学报,1999,21(4):36-38.
[3]张国伟,张本仁,袁学诚,等.秦岭造山带与大陆动力学[M].北京:科学出版社,2001:855.
[4]王靖华,张复新,于在平,等.秦岭金属矿床成矿系列与大陆造山带构造动力学背景[J].中国地质,2002,29(2):192-194.
[5]王清晨,孙枢,李继亮,等.秦岭的大地构造演化[J].地质科学,1989(2):129-141.
[6]陈衍景.秦岭印支期构造背景、岩浆活动及成矿作用[J].中国地质,2010,37(4):854-861.
[7]陈毓川,王平安,秦克令,等.秦岭地区主要金属矿床成矿系列的划分及区域成矿规律探讨[J].矿床地质,1994,13(4):290-296.
[8]弗·伊·斯米尔诺夫(苏).矿床地质学[M].北京:地质出版社,1985:34-36.
[9]朱赖民,张国伟,李犇,等.秦岭造山带重大地质事件、矿床类型和成矿大陆动力学背景[J].矿物岩石地球化学通报,2008,27(4):384-389.
[10]姚书振,周宗桂,吕新彪,等.秦岭成矿带成矿特征和找矿方向[J].西北地质,2006,39(2):157-170.
[11]闫臻,王宗起,陈雷,等.南秦岭山阳-柞水矿集区构造-岩浆-成矿作用[J].岩石学报,2014,30(2):401-414.
[12]宋小文,侯满堂,陈如意.陕西省成矿区(带)的划分[J].西北地质,2004,37(3):29-42.
[13]郑俊,朱赖民,姜航,等.南秦岭柞水-山阳矿集区印支期和燕山期花岗岩对比研究[J].矿物岩石地球化学通报,2015,34(6):1155-1172.
[14]王瑞廷,李剑斌,任涛,等.柞水-山阳多金属矿集区成矿条件及找矿潜力分析[J].中国地质,2008,35(6):1291-1297.
[15]王鸿祯,徐成彦,周正国.东秦岭古海域两侧大陆边缘区的构造发展[J].地质学报,1982,56(3):270-279.
[16]钟建华.陕西秦岭泥盆系区域成矿大地构造演化[J].大地构造与成矿学,1997,21(3):242-250.