岩石学报  2012, Vol. 28 Issue (2): 357-371   PDF    
华北克拉通南北缘三叠纪钼矿化类型、特征及地球动力学背景
曾庆栋, 刘建明, 肖文交, 褚少雄, 王永彬, 段晓侠, 孙燕, 周伶俐     
中国科学院矿产资源研究重点实验室,中国科学院地质与地球物理研究所, 北京 100029
摘要: 华北克拉通南北缘是中国最重要的钼成矿带,特别是近年来在南北缘陆续发现了大量的钼矿床,显示了巨大的钼资源前景。其中三叠纪钼矿床的不断发现引人注目。在华北克拉通北缘及邻区三叠纪钼矿床在空间上总体呈EW向展布,矿床产出受区域东西向断裂控制,钼矿床的形成与三叠纪酸性侵入体关系密切,多产于花岗岩体中、斑岩体内外接触带或附近,矿床类型包括斑岩型和石英脉型。在华北克拉通南缘及邻区,三叠纪钼矿床总体上呈NW向展布,受区域NW向断裂控制,钼矿床的形成与晚三叠世酸性侵入体及碳酸盐脉有关,矿床产于斑岩体内及附近,矿床类型包括斑岩型、石英脉型及碳酸盐脉型。成矿年代学研究表明,华北克拉通北缘及邻区三叠纪钼矿主要形成于248~220Ma,而南缘及邻区三叠纪钼矿床主要形成于226~210Ma。其对应的成矿动力学背景为印支期华北板块与西伯利亚板块同碰撞造山过程和扬子板块与华北板块同碰撞造山过程。
关键词: 华北克拉通北缘     华北克拉通南缘     钼矿床     三叠纪     成矿动力学背景    
Mineralizing types, geological characteristics and geodynamic background of Triassic molybdenum deposits in the northern and southern margins of North China Craton
Zeng QingDong, Liu JianMing, Xiao WenJiao, Chu ShaoXiong, Wang YongBin, Duan XiaoXia, Sun Yan, Zhou LingLi     
Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
Abstract: The northern and southern margins of North China Craton are the important molybdenum metallogenic belts in China, and a lot of molybdenum deposits were discovered in these two belts in recent years, this indicate that these belts have a huge exploration potential. The Triassic molybdenum deposits catch geologist's eye. The Triassic molybdenum deposits distribute along the northern margin, southern margin and adjacent area of North China Craton. The molybdenum deposits are controlled by regional EW-, and NW-trending faults, and is associated with acid granites and carbonitite dykes in time and space. The molybdenum deposits are usually distributed in granite body, along the endo-or exo-contact zones of the ore-forming rock body, or nearby. The molybdenum deposits can be classified into two types: porphyry and vein type. The vein type deposits are divided into two subtypes: quartz vein and carbonitite vein type deposits. The geochronology data shows that the molybdenum deposits in the northern margin and southern margin of the North China Craton and adjacent area were formed in 248~220Ma, and 226~210Ma, respectively. The corresponding geodynamic background is the syn-collisional and post-collisional extension of the newly-amalgamated North China-Siberian plates during Indo-Chinese epoch, and syn-collisional setting of the amalgamated North China-Yangtze plates.
Key words: Northern margin of the North China Craton     Southern margin of the North China Craton     Molybdenum deposit     Triassic     Metallogenic geodynamic settings    

中国是世界上钼资源量最大的国家,有两大钼矿带:分别是位于华北克拉通南缘的东秦岭钼矿带和北缘的燕辽钼矿带。东秦岭钼矿带北以三宝断裂为界,南至商丹断裂(图 1),北西向延长约400km,南北宽约120km,产有金堆城、东沟、南泥湖、三道庄、上房沟等超大型钼矿床在内的二十余个钼矿床(王天聪,1985黄典豪等,198519871994胡受奚等,1988Stein et al., 1997;张文献,1997徐兆文等,2000李永峰等,200320052006叶会寿等,2006郭保健等,2006李诺等,20072009倪智勇等,2008Mao et al., 20082011),是中国也是世界上最大的钼矿带。燕辽钼矿带是中国第二大钼矿带,东西向展布,长约640km,南北宽约120km,包括兰家沟、杨家杖子、撒岱沟门、小寺沟、大湾等大型钼矿床在内的二十余个钼矿床(黄典豪等,1996韩秀丽和尹力军,1999田豫才,1999马建德等,2002代军治等,200620072008张遵忠等,2009; 骆文娟等,2010; Han et al., 2009Zeng et al., 2011a)。这两大钼矿带及邻区钼矿床绝大多数形成于燕山期。但近年来在华北克拉通南北缘及邻区相继发现了印支期三叠纪钼矿床,如华北克拉通北缘的车户沟钼矿床、查干花钼矿床、南缘的大湖钼金矿床、温泉钼矿床等(图 1)。这些钼矿床的不断发现,不仅增加了成矿带钼资源量,而且对于深入探讨钼矿成矿的地球动力学背景具有重要的理论意义。

图 1 华北克拉通南北缘三叠纪钼矿床分布图(底图据马丽芳,2002) Fig. 1 Distribution map of Triassic molybdenum deposits in the northern and southern margins of North China Craton(modified after Ma, 2002)
1 地质背景 1.1 华北克拉通北缘

华北克拉通北缘包括华北克拉通北缘及其温都尔庙早古生代增生带,呈东西向展布于中国北方。北缘主要由太古代角闪岩相变质岩系、混合岩、混合花岗岩,元古代、古生代碳酸盐-碎屑岩沉积盖层组成。温都尔庙早古生代增生带以温都尔庙群中浅变质海相火山沉积岩系为主要组成,以产有温都尔庙式铁矿,非层序性蛇绿岩和高压变质矿物组合为特征。由下部绿泥斜长片岩、凝灰岩、安山质玄武岩、辉绿玢岩,中部细晶石英岩、含铁石英岩和碧玉岩,及上部泥硅岩组成,下部变质火山岩Sm-Nd年龄为807Ma(聂凤军等,1994)。上部绿片岩和绢云母石英片岩Rb-Sr年龄为435±6lMa和509±40Ma, K-Ar年龄为463~473Ma(唐克东等,1983),并认为上部沉积岩形成于早古生代早期。带内东段(大兴安岭南侧)还发育二叠纪浅质火山-沉积岩系。它们均可成为三叠纪钼矿床的围岩。

北缘构造以赤峰-开原断裂为区内规模最大的断裂,东西向展布于华北克拉通北缘,是华北克拉通与早古生代增生带的分界断裂,也是区内最重要的控岩控矿构造,它控制了断裂两侧古生代及三叠纪花岗岩的侵入及金属矿床的分布。

1.2 华北克拉通南缘

位于华北克拉通南缘的秦岭造山带是秦岭钼矿带产出的构造环境。秦岭造山带夹持于三门峡-宝丰断裂与龙门山-大巴山断裂之间,是一长寿断裂。中元古开始活动,最终形成于中生代华北与华南板块之间的碰撞造山作用(陈衍景和富士谷,1992朱日祥等,1998)。自北而南,秦岭造山带可分为华北克拉通南缘、北秦岭造山带、南秦岭造山带和扬子克拉通北缘等4个构造单元,分别相当于碰撞大地构造相的仰冲基底推覆体、增生弧地质体、大洋台地复理石褶冲带和前陆褶冲带,其边界断裂由北向南依次为三门峡-宝丰断裂、栾川断裂、商丹断裂、缅略断裂和龙门山-大巴山断裂(李诺等,2007)。目前,秦岭钼矿带三叠纪钼矿床产出主要限于华北克拉通南缘和西秦岭造山带(图 1)。

2 三叠纪钼矿化类型

根据钼矿化特征、围岩蚀变及产出地质环境,将三叠纪钼矿床划分为两种类型:斑岩型和热液脉型。热液脉型可进一步分为两个亚类:石英脉型和碳酸盐脉型。

斑岩型钼矿化 该类型矿化主要发育于三叠纪花岗斑岩体内,成矿斑岩体呈岩株状产出,规模较小,一般小于1km2。矿床围岩包括矿化主要呈网脉状、细脉浸染状及角砾状产出,矿体呈缓倾斜似层状或透镜状产出,矿体规模变化较大,小者厚几米,大者达数百米。矿体品位较低,钼品位一般在0.06%~0.1%。含微量铜,且变化不均。矿床蚀变规模较大,一般大于5km2,并具有明显的蚀变强弱分带。蚀变类型包括硅化、钾化、绢云母化、绿泥石化、高岭石化等。矿石矿物主要为辉钼矿、黄铁矿,少量黄铜矿。矿石构造主要为网脉状、细脉浸染状及角砾状。斑岩型钼矿床是三叠纪钼矿中资源量最大的矿床类型。该类型矿床包括内蒙古车户沟钼铜矿床、大苏计钼矿床、查干花钼矿床、小狐狸山钼矿床、西沙德盖钼矿床、新疆白山钼矿床、河北撒岱沟门钼矿床和陕西温泉钼矿床。

碳酸盐脉型钼矿化 主要发育于华北克拉通南缘,目前在华北克拉通北缘尚未发现这一类型矿床。该类型矿化受NW向及NE向断裂控制,由含钼(铅)石英方解石脉组成,矿体呈似层状和透镜状,一般脉长几十至100多米,最长达500m,宽0~10m,最宽20m。 围岩蚀变限于矿脉两侧,主要有云母化、绿帘石化、黄铁矿化、碳酸盐化、硬石膏化和沸石化。主要矿石矿物为辉钼矿、方铅矿、黄铁矿。矿床钼平均品位在0.08%~0.09%。该类型矿床包括陕西黄龙铺钼铅矿床、河南黄水奄钼铅矿床。

石英脉型钼矿化 在华北克拉通南北缘都有发育,矿化受断裂构造控制,由含钼石英脉组成。矿体具有尖灭再现及膨缩现象,矿化发育在石英脉及两侧的蚀变岩中,因此包括石英脉型和蚀变岩型矿石,矿体长度在几十米至2800米,厚度十几厘米至为1米。蚀变类型包括钾长石化、硅化、绿泥石化、绢云母化、绿帘石化和黄铁矿化,局部见萤石化。主要矿石矿物为黄铁矿、方铅矿、闪锌矿、黄铜矿、辉铜矿、辉钼矿等,脉石矿物主要为石英、钾长石、斜长石、方解石、绿泥石、绿帘石、绢云母、萤石等。矿石主要为浸染状、网脉状、脉状、块状、条带状构造。矿石钼品位一般为0.03%~0.36%,个别达1%,金钼矿床中矿石金平均品位为6.03~6.7g/t。该类型矿床包括内蒙古元宝山钼矿床、库里吐钼铜矿床、河南大湖金钼矿床、马家洼金钼矿床。

三叠纪钼矿床简要地质特征见表 1

表 1 华北克拉通南北缘三叠纪钼矿床地质特征 Table 1 The geological characteristic of Triassic molybdenum deposits in northern and southern margins of North China Craton
3 典型矿床

华北克拉通南、北缘陆续发现的具有大型规模的三叠纪钼矿床其成矿特点各异,深入了解这些典型钼矿床的特征,对于在华北克拉通南、北缘开展区域成矿规律研究及区域找矿均具有重要的理论与实际意义。限于篇幅,仅选择了不同类型代表性矿床予以介绍。

3.1 查干花斑岩型钼矿床

查干花大型钼矿床位于内蒙古巴彦淖尔市乌拉特后旗境内,地理坐标为:东经107°09′00″~107°30′00″和北纬41°47′00″~42°00′00″。2006年由内蒙古自治区第一地质矿产勘查开发院发现,目前已控制钼储量26万吨,钼平均品位0.129%(席忠等,2010)。

查干花钼矿位于华北板块北部大陆边缘、天山-兴盟造山带中段(图 1)。矿区出露地层为古元古界宝音图群,其主要岩性组合为浅灰色-灰绿色千枚岩、绢云石英片岩、浅变质粉砂岩等。矿区侵入岩为中细粒二长花岗岩(图 2a,其矿物组成为石英35%~45%、钾长石28%~32%、斜长石20%~28%、黑云母2%~4%(蔡明海等,2011)。

图 2 查干花钼矿地质简图(a)和勘探线剖面图(b)(据蔡明海等,2011) Fig. 2 Simplified geological map(a)and exploration section(b)of the Chaganhua molybdenum deposit(after Cai et al., 2011)

查干花矿区地表石英脉极其发育,与钼矿化、强硅化、云英岩化分布范围大致相当(图 2a)。石英脉方向以近SN向和近EW向为主,NW向和NE向次之。区内钼矿体主要为隐伏矿体,沿中细粒二长花岗岩与宝音图群地层的接触带分布,构成了北西长约1600m,南西-北东方向宽300~700m的钼矿化带(图 2a)。目前区内已圈出钼矿体19个,1号矿体是区内规模最大的矿体(图 2b),呈不规则厚层状产于云英岩化二长花岗岩内,有分枝复合现象,控制长约1400m、宽300~800m、厚2.73~280.00m。矿体走向NW330°左右、倾向NE,倾角10°~26°。平均钼品位0.106%。金属矿物主要有辉钼矿、黄铜矿、黄铁矿、磁铁矿等,非金属矿物以长石、石英、白云母为主,高岭土、绿泥石次之。矿床围岩蚀变类型包括钾化、云英岩化、硅化、高岭土化、绿泥石化、绿帘石化、碳酸盐化等。辉钼矿Re-Os等时线年龄(242.7±3.5Ma)表明查干花钼矿形成于早三叠世晚期或中三叠世早期(蔡明海等,2011)。

3.2 温泉斑岩型钼矿床

温泉钼矿床位于甘肃省武山县温泉乡境内,地理坐标为:东经105°03′00′~105°07′00″,北纬34°36′15″~34°39′00″。2000年由甘肃有色地勘局发现,目前已控制钼资源量10.7万吨,钼品位在0.01%~0.48%之间(韩海涛等,2008Zhu et al., 2010)。

温泉钼矿床在大地构造上属于秦岭造山带的西段(也称西秦岭造山带)(图 1)。钼矿床产于温泉岩体中,岩体是一中浅成侵入杂岩体,呈岩基产出,面积253m2。岩体以印支期为主(201~218Ma),岩石类型有闪长岩、花岗闪长岩、似斑状花岗岩、含斑黑云母二长花岗岩等,主体相为似斑状黑云母二长花岗岩。晚期侵入的花岗斑岩,在岩体中呈半隐伏岩株状产出,是主成矿侵入体。二长花岗岩的主要矿物组成为: 石英20%~30%,斜长石30%~35%,钾长石30%~35%,黑云母2%~6%. 花岗闪长岩的主要矿物组成为: 石英15%~20%,斜长石30%~45%,钾长石15%~30%,黑云母3%~6%,角闪石1%~3%(朱赖民等,2009)。黑云二长花岗斑岩主要矿物组成为: 斑晶为钾长石(6%~10%)、斜长石(6%~12%)、石英(5%~10%)和少量黑云母,基质为钾长石(20%~28%)、斜长石(18%~25%)、石英(18%~23%),少量黑云母(2%~3%)及角闪石(韩海涛等,2008)。

钼矿体主要产在花岗斑岩及似斑状黑云母二长花岗岩中(图 3)。地表矿化零星分散,品位低。在地表下20~50m深处矿化连成一体,构成面型矿化。目前控制主矿体南北长近800m,东西宽400m,控制厚度最大445m,最小37m(图 3b)。矿化呈网脉状、细脉状产出。矿石矿物主要为辉钼矿和黄铁矿,少量黄铜矿和磁铁矿。脉石矿物主要为石英、钾长石和斜长石,少量黑云母、浊沸石、角闪石、方解石、绢云母、高岭石、绿泥石等。构造为细脉状、细脉浸染状和星散浸染状。矿床围岩蚀变主要为硅化、绢云母化、高岭土化、碳酸盐化、钾化。辉钼矿Re-Os等时线年龄(214±7.1Ma)表明温泉钼矿钼矿形成于晚三叠世(韩海涛等,2008)。

图 3 温泉钼矿地质简图(a)和勘探线剖面图(b)(据韩海涛,2009简化) Fig. 3 Simplified geological map(a)and exploration section(b)of the Wenquan molybdenum deposit(simplified after Han, 2009)
3.3 黄龙铺碳酸盐脉型钼铅矿床

黄龙铺钼矿田位于华北克拉通南缘(图 1)。其围岩地层为太古代的太华群片麻岩系和元古代的熊耳群火山岩建造、官道口群和栾川群浅变质含碳碎屑岩-碳酸盐岩-硅质岩建造(胡受奚等,1988; 陈衍景和富士谷,1992)。区内断裂带走向为NW向。矿田包括垣头、文公岭、大石沟、石家湾、桃园和二道河等矿床、矿点(图 4)。大石沟、石家湾和桃园构成独立矿床。成矿元素以钼为主,次为稀土、铅和钨。除文公岭和石家湾I矿体外,钼矿体均产于碳酸岩脉内。各矿床、矿点简要特征如下(许成等,2009)。

图 4 黄龙铺钼矿地质简图(据许成等,2009) Fig. 4 Simplified geological map of the Huanglongpu Mo deposit(after Xu et al., 2009)

垣头矿点 产于太华群片麻状花岗岩中,矿体由碳酸岩岩脉组成,单脉长100~1000m,走向为NW-NNW。矿物成分主要为方解石、石英、天青石、微斜长石、黄铜矿、方铅矿、辉钼矿、等。矿石品位: Mo=0.07%~0.144%,Pb=0.1%~0.5%。该矿区钼资源量1700吨,铅2000吨。

文公岭矿点 产于熊耳群火山岩和官道口群绢云板岩和砂质板岩中,受NNW向断裂控制,矿区侵人岩有燕山期花岗岩和印支期的碳酸岩脉。矿体为钾长石-石英脉,北西向长约600m,宽200~260m。矿物成分主要为石英、钾长石、方解石、萤石、黄铁矿、黄铜矿、方铅矿、闪锌矿、辉钼矿和黑钨矿。矿石品位:Mo=0.036%~0.136%,Pb平均7.56%,Ag=500g/t~1000g/t, W03=0.1%~0.5%。矿区储量为2000吨Mo, 1000吨Pb, 6.75吨Ag, 3560吨W。

大石沟矿床 产于熊耳群火山岩和官道口群石英砂岩、绢云母板岩内。矿体由相互平行的北东向碳酸岩岩脉组成,受北西和北东向断裂控制,单脉最长达500m左右。围岩蚀变发育于矿脉两侧,主要有黑云母化、绿帘石化、黄铁矿化、碳酸盐化、硬石膏化和沸石化。矿物成分主要包括方解石、石英、天青石、微斜长石、黄铁矿、方铅矿、辉钼矿等。Mo品位为0.075%~0.103%,储量为8.94万吨,铅约19万吨。

桃园矿床 产于管道口群石英砂岩夹绢云板岩及熊耳群火山岩中,主要受北东向断裂控制。矿体由碳酸岩岩脉组成,脉体形态不规则,单脉一般长几米至80m,最长约800m。矿物成分主要为方解石、石英、钾长石、天青石、萤石、黄铁矿、黄铜矿、辉钼矿,方铅矿。Mo品位为0.041%~0.096%,储量3.84万吨。

石家湾矿床 矿区发育印支期辉绿岩、正长斑岩、含钼碳酸岩脉及燕山期二长花岗斑岩、云煌岩脉、斜长细晶岩脉。主矿体由碳酸岩脉组成,长达1km,为桃园矿体的东延部分,总体走向为NE-NEE,赋矿地层为管道口群石英砂岩和砂质绢云板岩。矿物成分主要为方解石、石英、天青石、钾长石、萤石、白云石、方铅矿、黄铁矿、辉钼矿。Mo品位为0.041%~0.104%,储量为14.29万吨。

二道河矿点 产于管道口群石英砂岩与砂质绢云板岩中,受北东东向断裂控制,矿体由碳酸岩岩脉组成,长几十米到400m左右,矿物成分与桃园相似。Mo品位为0.034%~0.129%。

3.4 大湖石英脉型金钼矿床

大湖金钼矿床位于华北克拉通南缘、小秦岭成矿带北缘(图 1),已控制金储量28吨,平均品位8.7g/t; 控制钼资源量达中型规模(李诺等,2008)。

矿区地层为太古宙-古元古代太华群,主要岩性为斜长角闪岩、角闪片麻岩、黑云斜长片麻岩、大理岩、石墨片麻岩以及混合片麻岩、条带状混合岩等。区内多期岩浆活动强烈,主要有前寒武纪混合花岗岩、花岗岩和伟晶岩,燕山期辉绿岩和花岗岩(图 5)。矿体受近东西向断裂破碎带控制。矿区断裂自北向南依次为F1、F8、F7、F35、F5、F6,其中F5是矿区内最重要的控矿断裂,沿该断裂发育多条含金石英脉。钼矿体与金矿体发育在同一构造带控制下的厚大石英脉中,钼矿体一般产于金矿体的深部。矿体厚10~100cm,局部膨大、狭缩。沿F35断裂发育的含辉钼矿石英脉长约900m,厚10~20m(地表宽10~50m),金矿化弱,钼品位0.15%~0.25%(李诺等,2008)。有两种矿石类型:石英脉型和构造蚀变岩型。矿石矿物主要为辉钼矿、黄铁矿、黄铜矿、方铅矿,脉石矿物主要为石英、钾长石、斜长石、方解石、绢云母、绿泥石等。围岩蚀变主要为硅化、绢云母化。

图 5 大湖金钼矿床地质简图(据杨志民,1995) Fig. 5 Simplified geological map of the Dahu Au-Mo deposit(after Yang, 2005)
4 三叠纪钼成矿地球动力学背景

对于钼成矿地球动力学背景,众多的专家学者进行了讨论,目前大多数学者认为斑岩钼矿的形成背景有5种(Lipman, 1988Ishihara, 1998; Carten et al., 1993; Me Cutcheon et al., 1997; 秦克章等,1999Chen YJ et al., 2000; Tosdal and Richards, 2001毛景文等,2003):(1) 大陆裂谷或伸展环境;(2) 与走滑断裂有关的伸展;(3) 陆相破火山口;(4) 大陆碰撞环境的晚期阶段;(5) 地幔柱。并且一般认为:富Au斑岩Cu矿床通常发育在岛弧的背景下,斑岩型Cu-Mo矿床似乎与大陆边缘的岩浆弧关系更密切,而斑岩型钼矿则产于地壳厚度较大的造山带(秦克章等,2008)。而近期研究表明,斑岩型钼矿床既可形成于伸展环境,也可形成于同碰撞的构造环境(Zeng et al., 2011b)。

对于产于华北克拉通南北缘的三叠纪钼矿床,许多矿床学者认为其形成于碰撞后的伸展构造环境(毛景文等,2003李永峰等,2005李诺等,2007朱赖民等,2009王义天等,2010Zhang et al., 2009)。但许多构造、变质岩等研究结果却表明,在三叠纪,南北缘钼成矿作用的构造环境应该是碰撞环境,但南北缘在时间上稍有差别。

华北克拉通南缘:黄龙铺碳酸岩脉钼(铅)矿床辉钼矿Re-Os等时线年龄为221.5Ma(Stein et al., 1997)、黄水奄碳酸盐脉型钼铅矿床辉钼矿Re-Os等时线年龄为209.5Ma(黄典豪等,2009)、大湖石英脉型金钼矿床辉钼矿Re-Os等时线年龄为226.6Ma(Mao et al., 2008)、马家洼石英脉型金钼矿床辉钼矿Re-Os等时线年龄为231Ma(王义天等,2010)、温泉斑岩型钼矿床辉钼矿Re-Os等时线年龄为214Ma(朱赖民等,2009),这些矿床年龄反映了中-晚三叠世成矿事件。

中-晚三叠成矿事件与华北板块与华南(扬子)板块之间大陆碰撞的时间一致(Ames et al., 1993; Li et al., 1993; Li et al., 1996; Hacker et al., 1998; Zheng et al., 2003)。在三叠纪,秦岭造山带东段的大别造山带由于华南板块向华北板块之下的俯冲作用而形成,俯冲的华南板块经历了超高压变质作用、并导致含柯石英榴辉岩的形成(Hacker et al., 1998; Zheng, 2008),秦岭造山带也经历了沿勉略缝合带向北的大陆俯冲作用(张国伟等,2001Zhang et al., 2004),三叠纪变质年龄为216.7~242.21Ma(Mattauer et al., 1985; Yin et al., 1991; Li et al., 1996)。据Zheng et al.(2009) 研究,超高压变质作用的时间和南北两大陆碰撞的时间是中-晚三叠世(240~225Ma)。因此,勉略蛇绿岩的年龄(242~221Ma)(Li et al., 1996)、勉略蓝片岩的年龄(216~240Ma)(Mattauer et al., 1985; Yin et al., 1991)与超高压变质岩的年龄一致。同碰撞花岗岩在秦岭-大别造山带广泛发育(Lu et al., 1996)也说明了华北克拉通与扬子克拉通之间大洋闭合于印支期(李永峰等,2004)。综上所述,华北克拉通南缘中-晚三叠世钼成矿作用发生于扬子克拉通与华北克拉通碰撞的构造环境,由于深断裂发育而导致深部岩浆及其成矿物质上涌至地壳浅部而成矿(图 6)。

图 6 三叠纪碰撞造山作用动力学与钼成矿模式(据毛景文等,2003修改) Fig. 6 Geodynamic model of the collision orogenic process and the molybdenum metallogenic episode of Triassic(248~210Ma)(modified after Mao et al., 2003

华北克拉通北缘:车户沟斑岩型钼铜矿床辉钼矿Re-Os等时线年龄为245Ma(Zeng et al., 2011b)、库里吐钼铜矿床辉钼矿Re-Os等时线年龄为236Ma(Zhang et al., 2009)、元宝山石英脉型钼矿辉钼矿Re-Os等时线年龄为248Ma(Liu et al., 2010)、大苏计斑岩型钼矿床辉钼矿Re-Os等时线年龄为222.5Ma(张彤等,2009)、西沙德盖斑岩型钼矿床辉钼矿Re-Os等时线年龄为226.4Ma(候万荣等,2010)、查干花斑岩型钼矿床辉钼矿Re-Os等时线年龄为242.7Ma(蔡明海等,2011)、小狐狸山斑岩型钼矿床辉钼矿Re-Os等时线年龄为220Ma(彭振安等,2010)、白山斑岩型钼矿床辉钼矿Re-Os等时线年龄为229Ma,这些钼矿床成矿年龄与其成矿的侵入体年龄一致(245~222Ma),反映了三叠纪的成岩成矿事件。

三叠纪的成岩成矿事件与华北板块与西伯利亚板块之间的大地构造演化密切相关,对应了华北板块与西伯利亚板块之间的碰撞及碰撞后的伸展构造环境。许多同位素年代学、岩石学以及构造年代学研究表明,西伯利亚板块与华北板块碰撞发生在二叠纪中晚期(Dobretsov et al., 1995; Windley et al., 2002; Xiao et al., 2003; Wu et al., 2007),且有可能持续到三叠纪中期(Xiao et al., 2009)。二叠纪中期古动物群的混生,标志着该碰撞过程的开始;三叠纪早-中期磨拉石沉积的出现和三叠纪中期岩浆活动的发生,标志着该区强烈碰撞造山作用的发生和碰撞过程的结束(刘伟等,20032007Davis et al., 2004; 李锦轶等,2007)。区内早-中三叠世花岗岩及成矿年龄发生在236~248Ma,表明这些花岗岩及成矿作用形成于同碰撞构造环境(图 6)。

晚三叠世S型花岗岩、闪长岩侵入于缝合带中(Chen B et al., 2000),这些花岗岩是弱铝质至准铝质花岗岩,并具有地壳熔融花岗岩的地球化学特征(Xiao et al., 2003; Chen et al., 2009)。闪长岩具有全岩Rb-Sr年龄为218~234Ma(牟保磊和阎国翰,1992; 邵济安等,19972000; 韩庆军等,2000; 徐贵忠等,2001),这些岩浆岩形成于伸展构造环境(牟保磊和阎国翰,1992; 邵济安等,20002007)。同时在晚三叠世发育大量与伸展作用有关的变质核杂岩构造等(张晓晖等,2002徐刚等,2003杜建军等,2007赵越等,2010)。因此晚三叠世岩浆侵入作用及其相应的钼成矿作用形成于碰撞后伸展构造环境。

三叠纪钼矿床的分布、形成时代及地球动力学环境研究表明,兴盟造山带及中央造山带(秦岭-昆仑造山带)是中国三叠纪钼矿床成矿潜力最大的两个造山带,也是最主要的找矿方向。

5 结论

(1) 华北克拉通南北缘发育的三叠纪钼矿床包括斑岩型、石英脉型和碳酸盐脉型钼矿床,这些钼矿床主要分布于华北克拉通北缘、南缘及邻区造山带,受区域断裂构造及侵入体控制。三叠纪钼矿床的形成与华北克拉通南、北缘大地构造演化密切相关。

(2) 华北克拉通南缘三叠纪钼矿床形成与中-晚三叠世扬子板块和华北板块之间的碰撞作用密切相关,区内三叠纪钼矿床年龄与区内变质岩、蓝片岩、蛇绿岩、同碰撞花岗岩时代一致,表明华北克拉通南缘三叠纪钼矿床形成于扬子板块和华北板块同碰撞构造环境。

(3) 华北克拉通北缘三叠纪钼矿床形成与古亚洲洋构造演化密切相关,北缘三叠纪钼矿床成矿年龄与区内同碰撞及后碰撞花岗岩的形成时代一致,表明北缘三叠纪钼矿床形成于早-中三叠世华北板块与西伯利亚板块同碰撞及晚三叠世碰撞后伸展的构造环境。

(4) 兴盟造山带及中央造山带是中国三叠纪钼矿床两个最主要的找矿方向。

致谢 感谢北京大学陈衍景研究员、中国地质科学院聂凤军研究员、中国科学院地质与地球物理秦克章研究员曾经给予的指导和帮助;感谢两位匿名审稿人对文稿提出宝贵的修改意见。
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