浅析东天山康古尔韧性剪切带对成岩成矿的制约——以新疆香山杂岩体为例
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摘要
东天山康古尔韧性剪切带是一个近东西走向复杂而强烈的构造变形带,控制着一系列岩浆活动和岩浆有关多金属矿床的分布。香山杂岩体位于康古尔韧性剪切带的东段,明显受香山断裂和黄山断裂的联合控制。在充分收集并分析前人资料基础上,首先将韧性剪切带的应力分析结果运用到了香山杂岩体的侵位机制的解释上。其次利用计算的杂岩体岩浆粘度值推测了杂岩体不同冷却程度(香山西岩体冷却较快,其次是香山东岩体,最慢的是香山中岩体)。笔者根据岩浆矿床成矿特征(取决于矿浆熔离的速度)推测,冷却较慢的岩体容易形成熔离型矿体,而冷却较快的岩体容易脆化形成贯入式矿体,冷却速度适中的容易形成上悬式矿体,这些特征与香山杂岩体中的矿体产出形态基本吻合。香山杂岩体所在断裂明显受区域应力场以及香山断裂和黄山断裂的联合控制,并且金山岩体的侵位局部影响了香山杂岩体侵位时的形态。最后,分析了剪切作用对矿体就位的控制作用。
The East Tianshan Kanggur ductile shear zone is a complicated and strong tectonic deformation zone,which controlleda series of magmatic activities and the distribution of metal deposits. The Xiangshan complex is located in the eastern section of theKanggur ductile shear zone,which was obviously controlled by the combination of Xiangshan fault and Huangshan fault. The emplace-ment mechanism of the Xiangshan complex is analyzed based on the mechanical analysis of the ductile shear zone on the basis of collec-ting and analyzing the previous data. Based on the calculated viscosity value of the complex,the different cooling rate was inferred,thatis,the Xiangshanxi intrusion cooled faster,the Xiangshandong was the second,and the slowest was the Xiangshanzhong. According tothe metallogenic characteristics of magmatic deposits,the lowest-cooling intrusion is easy to form the segregated orebody,while thequick cooling one is easy to form the penetrating ore-veins,and the moderate cooling one is easy to form the suspended orebody. Thesecharacteristics are basically consistent with the present orebody form in the Xiangshan complex. The fault of the Xiangshan complex si-ted is obviously controlled by the regional stress field and the combined control of the Xiangshan fault and Huangshan fault,and theemplacement of the Jinshan pluton imposed a local influence on the form of the intrusive pattern of the Xiangshan complex. Finally,theeffect of shear structure on the position of ore-body is analyzed.
The East Tianshan Kanggur ductile shear zone is a complicated and strong tectonic deformation zone,which controlleda series of magmatic activities and the distribution of metal deposits. The Xiangshan complex is located in the eastern section of theKanggur ductile shear zone,which was obviously controlled by the combination of Xiangshan fault and Huangshan fault. The emplace-ment mechanism of the Xiangshan complex is analyzed based on the mechanical analysis of the ductile shear zone on the basis of collec-ting and analyzing the previous data. Based on the calculated viscosity value of the complex,the different cooling rate was inferred,thatis,the Xiangshanxi intrusion cooled faster,the Xiangshandong was the second,and the slowest was the Xiangshanzhong. According tothe metallogenic characteristics of magmatic deposits,the lowest-cooling intrusion is easy to form the segregated orebody,while thequick cooling one is easy to form the penetrating ore-veins,and the moderate cooling one is easy to form the suspended orebody. Thesecharacteristics are basically consistent with the present orebody form in the Xiangshan complex. The fault of the Xiangshan complex si-ted is obviously controlled by the regional stress field and the combined control of the Xiangshan fault and Huangshan fault,and theemplacement of the Jinshan pluton imposed a local influence on the form of the intrusive pattern of the Xiangshan complex. Finally,theeffect of shear structure on the position of ore-body is analyzed.
引文
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陈柏林,陈宣华,王小凤,杨风,桑少杰,陈正乐,王克卓,王亚非,杨屹,李学智.2002.阿尔金北缘地区韧性剪切带型金矿床构造控矿解析[J].地质学报,76(2):235-243.
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陈继平,廖群安,张雄华,罗婷,郭东宝,胡兆初.2013.东天山地区黄山东与香山镁铁质-超镁铁质杂岩体对比[J].地球科学-中国地质大学学报,38(6):1183-1196.
陈世平,王登红,屈文俊,陈郑辉,高晓理.2005.新疆葫芦铜镍硫化物矿床的地质特征与成矿时代[J].新疆地质,23(3):230-233.
陈文,孙枢,张彥,肖文交,王义天,王清利,姜立丰,杨俊涛.2005.新疆东天山秋格明塔什-黄山韧性剪切带40Ar/39Ar年代学研究[J].地质学报,79(6):790-804.
顾连兴,张遵忠,吴昌志,王银喜,唐俊华,汪传胜,郗爱华,郑远川.2006.关于东天山花岗岩与陆壳垂向增生的若干认识[J].岩石学报,22(5):1103-1120.
韩宝福,季建清,宋彪,陈立辉,李宗怀.2004.新疆喀拉通克和黄山东含铜镍矿镁铁-超镁铁杂岩体的SHRIMP锆石U-Pb年龄及其地质意义[J].科学通报,49(22):2324-2328.
郝立波,李殿超,吕志成,孙国胜.2001.内蒙古额尔古纳河韧性剪切带与金矿化[J].黄金,22(3):7-10.
郝雅,刘鹏.1993.一些与韧性剪切带有关的金矿地质特征[J].贵金属地质,2(1):54-61.
姜超.2014.东天山香山铜镍硫化物-钛铁氧化物矿床成因研究[D].硕士学位论文,导师:钱壮志.西安:长安大学,页数135.
李德东,罗照华,周久龙,杨宗锋,刘翠.2011.岩墙厚度对成矿作用的约束:以石湖金矿为例[J].地学前缘,18(1):166-178.
李德东,王玉往,王京彬,王莉娟,龙灵利,廖震.2012.新疆香山杂岩体的成岩与成矿时序[J].岩石学报,28(7):2103-2112.
李锦轶.2004.新疆东部新元古代晚期和古生代构造格局及其演变[J].地质论评,50(3):304-322.
李月臣,赵国春,屈文俊,潘成泽,毛启贵,杜安道.2006.新疆香山铜镍硫化物矿床Re-Os同位素测定[J].岩石学报,22(1):245-251.
刘俊来.1993.韧性剪切带中含金石英脉的就位机制[J].吉林地质,12(3):16-23.
马佳虹.2012.金川矿区韧性剪切带特征及其意义[D].硕士学位论文,导师:闫海卿.西安:长安大学,页数64.
毛景文,杨建民,屈文俊,杜安道,王志良,韩春明.2002.新疆黄山东铜镍硫化物矿床Re-Os同位素测定及其地球动力学意义[J].矿床地质,21(4):323-330.
秦克章,方同辉,王书来,朱宝清,冯益民,于海峰,修群业.2002.东天山板块构造分区、演化与成矿地质背景研究[J].新疆地质,20(4):302-308.
秦克章,彭晓明,三金柱,徐兴旺,方同辉,王书来,于海峰.2003.东天山主要矿床类型、成矿区带划分与成矿远景区优选[J].新疆地质,21(2):143-150.
秦克章,唐冬梅,苏本勋,毛亚晶,薛胜超,田野,孙赫,三金柱,肖庆华,邓刚.2012.北疆二叠纪镁铁-超镁铁岩铜、镍矿床的构造背景、岩体类型、基本特征、相对剥蚀程度、含矿性评价标志及成矿潜力分析[J].西北地质,45(4):83-116.
三金柱,秦克章,汤中立,唐冬梅,苏本勋,孙赫,肖庆华,刘平平.2010.东天山图拉尔根大型铜镍矿区两个镁铁-超镁铁岩体的锆石U-Pb定年及其地质意义[J].岩石学报,26(10):3027-3035.
申茂德.2003.东天山香山铜镍矿区构造特征与成岩成矿[J].新疆地质,21(2):195-198
孙桂玉.1990.脆-韧性剪切带控矿的初步探讨-对金川铜镍矿控岩控矿构造的新见解[J].矿床地质,4(9):352-362.
孙晓明.1998.韧性剪切带中的脆性构造及其对金矿化的控制[J].中山大学学报(自然科学版),37(1):98-102.
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