内蒙古莫古吐花岗岩年代学、地球化学与地壳伸展-减薄作用

杨朝磊, 邹滔, 祝新友, 杨尚松, 蒋昊原, 袁伟恒, 彭伟刚, 柳玉龙, 马一奇. 2021. 内蒙古莫古吐花岗岩年代学、地球化学与地壳伸展-减薄作用[J]. 中国地质, 48(1): 247-263. doi: 10.12029/gc20210117
引用本文: 杨朝磊, 邹滔, 祝新友, 杨尚松, 蒋昊原, 袁伟恒, 彭伟刚, 柳玉龙, 马一奇. 2021. 内蒙古莫古吐花岗岩年代学、地球化学与地壳伸展-减薄作用[J]. 中国地质, 48(1): 247-263. doi: 10.12029/gc20210117
YANG Chaolei, ZOU Tao, ZHU Xinyou, YANG Shangsong, JIANG Haoyuan, YUAN Weiheng, PENG Weigang, LIU Yulong, MA Yiqi. 2021. Chronology and geochemistry of Mogutu granite in Inner Mongolia and its effect of crustal extension and thinning[J]. Geology in China, 48(1): 247-263. doi: 10.12029/gc20210117
Citation: YANG Chaolei, ZOU Tao, ZHU Xinyou, YANG Shangsong, JIANG Haoyuan, YUAN Weiheng, PENG Weigang, LIU Yulong, MA Yiqi. 2021. Chronology and geochemistry of Mogutu granite in Inner Mongolia and its effect of crustal extension and thinning[J]. Geology in China, 48(1): 247-263. doi: 10.12029/gc20210117

内蒙古莫古吐花岗岩年代学、地球化学与地壳伸展-减薄作用

  • 基金项目:
    国家重点研发计划“深地资源勘查开采”重点专项项目(2017YFC0601305、2017YFC0602403)、国家自然科学基金项目(41602098)及中国地质调查局项目(DD20190815)联合资助
详细信息
    作者简介: 杨朝磊, 男, 1991年生, 硕士, 助理工程师, 主要从事矿床地球化学研究工作; E-mail:yangchaolei@cugb.edu.cn
    通讯作者: 邹滔, 男, 1983年生, 博士, 高级工程师, 长期从事矿床地球化学研究工作; E-mail:272582646@qq.com
  • 中图分类号: P597;P588.12+1

Chronology and geochemistry of Mogutu granite in Inner Mongolia and its effect of crustal extension and thinning

  • Fund Project: Supported by National Key Research and Development Program of China"Deep Resource Exploration and Mining" (No. 2017YFC0601305, 2017YFC0602403), Natural Nature Science Fund (No.41602098) and the project of China Geological Survey(No. DD20190815)
More Information
    Author Bio: YANG Chaolei, male, born in 1991, master, assistant engineer, engaged in the study of ore deposit geochemistry; E-mail:yangchaolei@cugb.edu.cn .
    Corresponding author: ZOU Tao, male, born in 1983, doctor, senior engineer, engaged in the study of ore deposit geochemistry; E-mail:272582646@qq.com
  • 莫古吐花岗岩体位于大兴安岭南段黄岗梁-甘珠尔庙锡多金属成矿带西南端,其岩性主要以黑云母钾长花岗岩为主。文章通过LA-ICP-MS锆石U-Pb定年及岩石地球化学研究分析,探讨莫古吐花岗岩的成因类型、岩浆源区及成岩构造背景。锆石U-Pb年代学研究表明,莫古吐岩体形成于148.8~152.7 Ma,属晚侏罗世岩浆产物。岩石学及地球化学特征显示,莫古吐花岗岩属于碱性-弱过铝质系列,具有富SiO2(73.64%~80.86%),富K2O(2.6%~6.0%),贫Al2O3(10.57%~13.88%)的特点,富集Rb、U、Th等大离子亲石元素,亏损P、Ti、Ba、Sr等元素,稀土配分型式呈燕式分布,δEu值为0.10~0.27,负Eu异常明显,锆石饱和温度较高,为795~911℃,属于高演化A型花岗岩。结合年代学、地球化学数据及前人研究成果,认为莫古吐花岗岩体的岩浆源区较浅,成岩物质主要以壳源物质为主,岩体形成于地壳伸展-减薄的构造环境中,与蒙古-鄂霍茨克洋构造体制的关系更为密切。

  • 大兴安岭南段是中国北方重要的锡多金属成矿集中区,地处古亚洲洋成矿域与环太平洋成矿域叠加部位(王京彬等, 2005; Zeng et al., 2013, 2015),成矿地质条件优越,分布有众多晚中生代的有色金属、贵金属矿床,规模较大的如白音诺尔铅锌矿、黄岗梁锡铁矿、拜仁达坝铅锌银矿、大井子锡铜矿等。区域内中生代花岗岩类广泛分布,这些花岗岩作为中国东部构造岩浆事件的直接产物,与中生代大规模内生成矿作用之间有着十分密切的关系(毛景文等, 2003, 2005, 2013; 陈志广等,2008)。时空特征显示,大兴安岭南段不仅存在着一批与锡多金属矿成矿时间(130~140 Ma)一致的花岗岩(Ouyang et al., 2013; 王春女等, 2016),而且随着矿床研究工作的不断深入,研究者们总体认为本区锡多金属矿的形成与燕山期的高演化花岗岩侵入体有关(刘建明等, 2004; Zeng et al., 2010; 程细音等, 2017)。尤其对于一些大型的锡多金属矿床而言,高演化花岗岩就是成矿岩体,其成岩过程不仅为矿床形成提供了足够的热源,同时,其从深部所携带的各类成矿元素也是矿床形成所必须的矿源物质的一部分,如黄岗梁锡铁矿床(王莉娟等, 2001; 刘智等, 2012, 2013)、维拉斯托锡多金属矿床(江思宏等, 2010; 祝新友等, 2016)等。因此,查明与锡矿化有关的花岗岩的演化特征、成因类型及其与锡矿化的关系,对于该地区锡多金属矿产的勘查工作就显得尤为重要。

    莫古吐花岗岩体位于大兴安岭南段黄岗梁—甘珠尔庙锡多金属成矿带西南端,岩体周围发育有大莫古吐铁锡矿、小莫古吐铁锌矿、银洞子铅锌矿等矿床,对该岩体前人开展了不同程度的研究工作,但大都集中于周围矿床的地质特征与矿床成因方面,而对于岩体年代学、地球化学特征等方面的研究目前尚属空白。鉴于此,本文选择该岩体作为研究对象,通过LA −ICP−MS锆石U−Pb定年、岩石学及地球化学研究分析,探讨莫古吐花岗岩的岩石成因类型、岩浆源区及成岩构造背景,从而为大兴安岭南段中生代花岗岩的成因机制、成岩地球动力学因素及成矿作用研究提供更直接的信息与线索。

    本区位于大兴安岭南段晚古生代增生造山带中,其南北边界分别为西拉木伦断裂和贺根山断裂,向东以嫩江断裂为界,向西没有截然的边界(图 1a)(Wu et al., 2011)。区域内断裂构造发育,主要以NE向断裂以及次一级的NW向、EW向断裂为主,不同断裂相互交错,构成格子状构造系统,对控岩、控矿有着十分重要的意义(任耀武,1995)。研究区内出露地层主要包括上侏罗统满克头鄂博组(晶屑凝灰岩、凝灰质角砾岩)、中侏罗统新民组(粉砂岩、细砂岩、砂砾岩)、上二叠统林西组(粉砂岩、板岩)及中二叠统哲斯组(变质粉砂岩、钙质砂岩、大理岩、硅质岩、粉砂质板岩)、大石寨组(安山岩、细碧岩)等(图 1b)。侵入岩则主要为燕山期花岗岩,岩性以黑云母花岗岩、黑云母二长花岗岩、黑云母钾长花岗岩及花岗斑岩等为主。

    图 1.  中国东北区域构造单元划分(a,据Wu et al., 2011)、莫古吐地区区域地质图(b,据项目组内部资料修编)
    1—满克头鄂博组晶屑凝灰岩、凝灰质角砾岩;2—新民组粉砂岩、细砂岩、砂砾岩;3—林西组粉砂岩、板岩;4—哲斯组变质粉砂岩、钙质砂岩、大理岩、硅质岩、粉砂质板岩;5—大石寨组安山岩、细碧岩;6—辉长岩;7—流纹斑岩;8—闪长岩;9—花岗斑岩;10—黑云母二长花岗岩;11—黑云母花岗岩;12—黑云母钾长花岗岩;13—整合接触;14—断裂及编号(F1—蒙古—鄂霍茨克断裂;F2—德尔布干断裂;F3—贺根山断裂;F4—西拉木伦断裂;F5—康保—赤峰断裂;F6—嫩江八里罕断裂;F7—佳木斯—伊通断裂);15—金属矿床;16—采样位置;17—研究区
    Figure 1.  Tectonic subdivisions of northeastern China(a, after Wu et al., 2011); Regional geological map of the Mogutu area (b, after internal materials)
    1- Crystal tuff and tuffaceous breccia of the Manketouerbo Formation; 2- Siltstone, fine sandstone and glutenite of the Xinmin Formation; 3- Siltstone and slate of the Linxi Formation; 4- Metamorphic siltstone, calcareous sandstone, marble, siliceous and silty slate of the Zhesi Formation; 5- Andesite and spilite of the Dashizhai Formation; 6- Gabbro; 7- Rhyolite porphyry; 8- Diorite; 9- Granite porphyry; 10- Biotite adamellite; 11- Biotite- granite; 12- Biotite moyite; 13- Conformity; 14- Fracture and No. (F1- Mongolia Okhotsk fracture; F2- Deerbugan fracture; F3- Hegenshan fracture; F4 − Xilamulun fracture; F5- Kangbao- Chifeng fracture; F6- Nengjiang- Balihan fracture; F7-Jiamusi—Yitong fracture); 15-Ore deposit; 16-Sampling position; 17-Researched area

    莫古吐岩体受断裂构造控制明显,整体沿NE向展布,长5000 m,宽2000 m,面积大于15 km2,岩性主要为黑云母钾长花岗岩,岩体内岩脉较发育,以细粒花岗岩脉及花岗斑岩脉为主,脉宽一般5~10 m,延长100~250 m。岩体中的黑云母钾长花岗岩呈浅肉红色—灰白色(图 2ab),中细粒花岗结构,块状构造,主要矿物成分以钾长石为主,次为石英、斜长石以及少量黑云母(图 3ab),其中石英以无色透明为主,少量烟灰色(图 2c),粒度0.5~4 mm,含量30%,呈他形粒状充填在其他矿物之间;钾长石主要为正长石和微斜长石(图 3cd),手标本下浅肉红色—肉红色,半自形板柱状,粒度一般为2~4 mm,个别可达8~10 mm,含量45%,镜下因泥化现象而表面浑浊,常常交代熔蚀斜长石(图 3d),形成条纹长石(图 3ab);斜长石主要为钠长石,灰白色,呈半自形—自形短柱状,粒度主要集中在2~4 mm,含量20%,在镜下表面大多浑浊,具卡钠复合双晶(图 3d),部分长石绢云母化,可见绢云母呈斜长石假象出现(图 3e);黑云母,呈黑褐色,有褪色现象,以自形鳞片状为主,局部呈团块状发育(图 2d),片径0.5~2 mm,含量5%,部分黑云母发生绿泥石化蚀变并析出铁质,形成磁铁矿(图 3f),岩石中副矿物主要包括锆石、磁铁矿等,主要蚀变为高岭土化、绢云母化及绿泥石化。莫古吐花岗岩中还常见到伟晶结构(图 2e)及晶洞构造(图 2f)等现象发育,晶洞内有萤石(图 2g)、电气石(图 2h)等矿物出现。

    图 2.  莫古吐花岗岩野外照片
    a—浅肉红色黑云母钾长花岗岩;b—灰白色黑云母钾长花岗岩;c—烟灰色石英;d—团块状黑云母;e—伟晶结构;f—晶洞构造;g—萤石;h—电气石
    Figure 2.  Photographs of Mogutu granite
    a-Yellowish pink biotite moyite; b-Gray biotite moyite; c-Smoky quartz; d-Biotite briquettes; e-Pegmatitic texture; f-Miarolitic strecture; g-Fluorite; h-Tourmaline
    图 3.  莫古吐花岗岩显微镜下照片
    a—浅肉红色黑云母钾长花岗岩正交偏光镜下照片(+);b—灰白色黑云母钾长花岗岩正交偏光镜下照片(+);c—正长石的卡氏双晶(+);d—微斜长石交代溶蚀斜长石及斜长石发育卡钠复合双晶(+);e—绢云母呈斜长石假象发育(+);f—黑云母绿泥石化,并析出磁铁矿(−);Qz—石英;Bi—黑云母;Pl—斜长石;Kf—钾长石;Pth—条纹长石;Mt—磁铁矿;Ser—绢云母化;(+)—正交偏光;(−)—单偏光
    Figure 3.  Microphotographs of Mogutu granite
    a- Yellowish pink biotite moyite; b- Gray biotite moyite; c- Carlsbad twin law of orthoclase; d- Plagioclase was absorbed by the microcline and carlsbadal bite compound twin of plagioclase; e- Sericite appears to develop in the illusion of plagioclase; f- Magnetite precipitation of biotite mainly results from epidotization; Qz-Quartz; Bi-Bitite; Pl-Plagioclase; Kf-K-feldspar; Pth-Perthite; Mt-Magnetite; Ser-Sericitization; (−)-Plane polarization; (+)-Orthogonal polarization

    在莫古吐岩体中采集黑云母钾长花岗岩样品11件,其中年代学样品2件,地球化学样品9件,样品新鲜,在手标本及镜下观察显示蚀变微弱,具体采样位置见图 1b。岩体中黑云母钾长花岗岩的颜色存在一定变化(灰白色→浅肉红色),但在野外地质调查过程中,未发现不同颜色花岗岩相互侵入或穿插的有关证据,镜下鉴定结果显示浅肉红色花岗岩和灰白色花岗岩二者的矿物成分相同,岩性均为黑云母钾长花岗岩(图 3ab),笔者认为岩石颜色的差别可能与莫古吐岩体不同位置的风化程度、剥蚀深度及蚀变有关,因此,本文在划分样品时将它们归为同一种花岗岩。

    锆石单矿物的分选、制靶及阴极发光(CL)照相在北京锆年领航科技有限公司进行,将采集的原岩样品粉碎,按照常规重力及磁选方法分选后,在双目镜下根据锆石的颜色、自形程度、形态等特征进行初步分类,最后挑选出具有代表性的锆石。UPb同位素定年及微量元素含量测试在合肥工业大学资源与环境工程学院矿床成因与勘查技术研究中心(OEDC)矿物微区分析实验室用LA-ICP-MS完成。激光为Photon Machine公司的Analyte HE (激光源为相干公司的Compex102F),ICP-MS为Agilent 7900。对分析数据的离线处理(包括对样品和空白信号的选择、灵敏度漂移校正和元素含量分析)采用软件ICP-MS DataCal完成。锆石微量元素含量利用NIST 610作为外标、Si作内标的方法进行定量计算,U-Pb同位素定年中采用锆石标准91500作外标进行同位素分馏校正,每分析5个样品点,分析2次91500。分析期间,用GJ-1作为质量监控样,样品的U-Pb年龄谐和图绘制和年龄权重平均计算均采用Isoplot完成。

    样品的主微量及稀土元素的分析测试在廊坊市中铁物探勘察有限公司完成,主量元素测试仪器为ARL Advant XP型的X射线荧光光谱仪,测试依据参照GB/T14506.14-2010硅酸盐岩石化学分析方法及GB/T 14506.28-2010硅酸盐岩石化学分析方法完成,实验过程中温度20℃,相对湿度10%,测试相对标准偏差<3%。微量元素及稀土元素测试仪器为X-SERIES-2-ICP-MS电感耦合等离子体质谱仪,测试依据参照GB/T 14506.30-2010硅酸盐岩石化学分析方法完成,实验过程中温度20℃,相对湿度10%,测试相对标准偏差<5%。

    利用LA-ICP-MS对GMGT-3、GMGT-4两件黑云母钾长花岗岩样品进行锆石U-Pb定年实验。CL图像显示(图 4),莫古吐岩体花岗岩中的多数锆石颗粒晶形较好,呈自形—半自形的长柱状,长轴粒径为160~360 μm不等,长宽比为1:1~1:4,部分锆石晶棱及锥顶被溶蚀,锆石颗粒震荡环带清晰,锆石中的Th(178.0×10-6~2431.0×10-6)、U(368.0× 10-6~6448.0×10-6)比值为0.24~0.49,均大于0.1,为岩浆成因锆石(Hoskin and Black, 2000)。对2件样品共进行了19个点的分析测试,具体测试分析结果见表 1

    图 4.  莫古吐花岗岩体锆石阴极发光图(CL)图像及测试位置
    Figure 4.  Cathodoluminescence images of representative zircons and measuring positions of the Mogutu granite pluton
    表 1.  莫古吐花岗岩LA−ICP−MS锆石U−Pb分析数据
    Table 1.  LA−ICP−MS zircon U−Pb age of the Mogutu granite
     | Show Table
    DownLoad: CSV

    样品GMGT-3的12个测试点206Pb/238U年龄变化范围为148~150 Ma,Th/U比值为0.24~0.49,平均值0.33。样品GMGT-4的7个测试点206Pb/238U年龄变化范围为151~153 Ma,Th/U比值为0.31~0.49,平均值0.39。在U−Pb谐和图中2件样品的有效点投影均在谐和线或附近(图 5),谐和度较好,应为同期岩浆事件的产物;样品GMGT-3 206Pb/238U的加权平均年龄为(148.8±1.1) Ma,样品GMGT-4 206Pb/238U的加权平均年龄为(152.7±1.5) Ma。锆石U-Pb年代学研究表明,莫古吐岩体年龄值应为148.8~152.7 Ma,属于中生代晚侏罗世岩浆产物。

    图 5.  莫古吐花岗岩体锆石U−Pb谐和图
    Figure 5.  Zircon U-Pb age and its concordia diagram of the Mogutu granite body

    从主、微量元素分析结果(表 2)可以看出,莫古吐岩体具有富硅、钾,贫铝、钠、钙、铁、镁的特点,SiO2变化于73.64%~80.86%,显示出硅过饱和的特征,属于酸性岩,在TAS图解中(图 6),莫古吐岩体数据投点全部落入花岗岩范围内,与岩相学特征一致。样品全碱(ALK)质量分数值较高,为6.93~ 9.25,Al2O3含量相对较低(10.57%~13.88%),碱度率AR值为2.39~5.40,里特曼指数σ为1.34~2.66,在SiO2−AR图解中,样品投点多数落入碱性岩石系列区域中(图 7a)。岩石A/CNK为1.00~1.11,平均1.07,在A/CNK−A/NK图解中,莫古吐花岗岩主要位于过铝质区间内(图 7b)。综上认为岩体中的黑云母钾长花岗岩应属于富SiO2的碱性—弱过铝质花岗岩。

    表 2.  莫古吐花岗岩体主量元素(%)和微量元素(10−6)组成
    Table 2.  Major element (%) and trace element (10−6) composition of the Mogutu granite
     | Show Table
    DownLoad: CSV
    图 6.  莫古吐花岗岩TAS分类图解(据Middlemost, 1994
    Figure 6.  TAS diagram of the Mogutu granite(after Middlemost, 1994)
    图 7.  莫古吐花岗岩SiO2−AR岩石系列判别图(据Rickwood, 1989)和A/CNK−ANK图解(据Maniar and Piccoli, 1989
    Figure 7.  SiO2−AR discriminant diagram (after Rickwood, 1989) and A/CNK−ANK Diagram (after Maniar and Piccoli, 1989) of the granite

    莫古吐岩体花岗岩的稀土元素特征主要表现为,ΣREE=112.56×10-6~281.69×10-6,LREE/HREE变化较小,范围为3.73~8.57,(La/Yb)N值变化范围为3.37~8.15,属于轻稀土富集型,LREE的总量与ΣREE呈同消长关系,HREE总量则变化较小,表明岩体的ΣREE差别主要是LREE引起的。花岗岩的稀土元素球粒陨石标准化配分曲线呈燕式分布(图 8a),Eu亏损强烈,δEu值为0.10~0.27,推测在成岩过程中,岩浆可能经历了斜长石分离结晶作用,δCe值为0.66~1.02,稀土元素配分型式表现出与典型A型花岗岩类似的的特征(Joseph et al., 1987; 张旗等, 2012, 2013)。

    图 8.  莫古吐花岗岩稀土元素球粒陨石分布型式图(a)及微量元素原始地幔标准化蜘蛛图(b)
    (标准化数据据文献Sun and Mcdonough, 1989)
    Figure 8.  Chondrite-normalized REE pattern(a) and primitive mantle-normalized spider diagram(b)of the Mogutu granite
    (chondrite and primitive mantle normalized values after reference Sun and Mcdonough, 1989)

    微量元素中,Rb(173.0×10-6~465.0×10-6)、Yb(2.9×10-6~6.1×10-6)含量较高,Sr(25.5×10-6~116.0× 10-6)、Ba(48.0×10-6~334.0×10-6)含量低。高场强元素Nb(13.0×10-6~33.6×10-6)、Zr(54.3×10-6~177.0× 10-6)、Hf(3.2×10-6~7.1×10-6)、Ta(1.8×10-6~3.8×10-6)含量均偏低,Nb/Ta比值6.2~9.2,低于幔源岩浆Nb/ Ta=17±1比值(汪洋,2009)。放射性热元素U(3.3× 10-6~10.4×10-6)、Th(27.1×10-6~57.8×10-6)、Pb(17.3× 10-6~42.8×10-6)含量高,Th/U比值3.2~10.1。Rb/Sr(1.5~12.8)、Rb/Ba(0.7~3.6)比值变化范围不大,Y/ Nb(1.0~3.3)、Ce/Nb(2.0~5.8)比值均偏低。微量元素原始地幔标准化蜘蛛图(图 8b)显示,莫古吐岩体富集Rb、Th、U等元素,贫Sr、Ba、K、P和Ti等元素。

    高演化(分异)花岗岩指的是岩浆经过强烈结晶分异作用形成的花岗岩,该类岩石暗色矿物含量较低,如浅色花岗岩、白岗岩等。随着岩浆向后期演化,岩浆中的挥发份如H2O、Li、Cl、F、B等成分会高度富集,因此高度演化的花岗岩中通常可见到锂云母、萤石、电气石、黄玉等矿物(吴福元等,2017)。莫古吐花岗岩发育伟晶结构及晶洞构造,晶洞内有萤石、电气石等矿物出现,与高演化花岗岩特征相同(Dill,2015; 吴福元等,2017)。花岗岩样品中的强不相容元素Rb高度富集,表明岩体的成岩岩浆经历了高度的分异演化。在Rb−Sr−Ba图解中(图 9),除个别样品外,莫古吐岩体的其余样品均在高分异花岗岩区域内,由此,本文认为莫古吐花岗岩应属于一种高演化花岗岩。

    图 9.  莫古吐花岗岩Rb−Sr−Ba图解(据Müller and Groves, 2001
    Figure 9.  Rb−Sr−Ba triangular diagram of the Mogutu granite (after Müller and Groves, 2001)

    莫古吐花岗岩主量元素显示富硅(SiO2= 73.64% ~80.86%)、富钾(K2O=2.6% ~6.0%)、贫铝(Al2O3=10.57%~13.88%)的特点,稀土元素球粒陨石标准化配分曲线呈燕式分布,负Eu异常明显(δEu=0.10~0.27),在微量元素中富集U、Th、Rb等大离子亲石元素,亏损P、Ti、Ba、Sr等元素,这些特征使得莫古吐花岗岩既显示A型花岗岩特点,同时又具有I型花岗岩的特征,因此,莫古吐花岗岩的成因类型便成为一个值得讨论的问题。目前,关于花岗岩成因类型的分类,多数研究者通常采用MISA的分类方案,即根据花岗岩的地球化学特征、源区性质及形成构造背景等将其分为M(mantle-derived)型、I(in-fracrustal或igneous)型、S(supracrustal)型和A(alkaline、anorogenic、anhydrous)型4种(吴福元等,2007)。传统意义的A型花岗岩被认为是碱性、无水、非造山的花岗岩(Loiselle and Wones, 1979),岩石中含有碱性暗色矿物(如钠闪石−钠铁闪石、霓石−霓辉石、铁橄榄石等)是判别该类花岗岩的一个重要矿物学标志,I型花岗岩则以岩石中出现角闪石,标准矿物刚玉 < 1%等为特征(Chappell and White, 1974; 吴福元等,2007)。而当A型或者I型这两类花岗岩经历高度的分异结晶作用之后,二者的矿物组成和化学成分会趋近于低共结的花岗岩,地球化学特征变得十分相似,因此无法通过标志性矿物来对它们进行有效识别。在岩石类型上,碱长花岗岩、钾长花岗岩、石英正长岩及紫苏花岗岩等多种碱性花岗岩均属于A型花岗岩,该类花岗岩不仅包括了碱性岩类,还扩大到钙碱性、弱碱−准铝、弱过铝甚至强过铝质岩石(许保良等,1998),甚至一些高分异的I型或S型花岗岩也属于A型花岗岩,因此,A型花岗岩的判别一直颇具争议。对此,张旗等(2012)在综合前人研究成果的基础上指出,典型A型花岗岩最主要的地球化学特征是富K2O(4%~ 6%或更高)、富SiO2(通常>70%,多数>75%)、贫Al2O3(一般12%~13%)、Sr、Ba、Eu、Ti和P,REE分布具明显的负Eu异常(以δEu<0.3为标志)等,这些特征是当前判别A型花岗岩最直接有效的标志。

    从前文可知,莫古吐花岗岩样品的主微量元素特征与上述A型花岗岩特征有着相同的特点。目前,多数学者普遍认为A型花岗岩形成温度较高,通常>800℃(King et al., 1997贾小辉等,2009),莫古吐岩体锆石的CL图像(图 4)中未发现任何继承锆石,花岗岩锆石的饱和温度(TZr)为795~911℃,平均842℃,明显高于I型花岗岩的平均温度764℃(King et al., 1997),而与A型花岗岩的平均温度833℃(刘昌实等,2003)更为接近;在花岗岩成因类型判别图解中(图 10),岩石样品数据的投点也均位于A型花岗岩区域内,由此,判断莫古吐花岗岩不属于I型花岗岩,而属于A型花岗岩。典型的A型花岗岩因富碱性而有着较高的Zr、Ce、Nb和Y含量,但经过强结晶分异作用后,岩石中Zr的含量往往就会变低,甚至低至100.0×10-6左右(King et al., 2001)。莫古吐花岗岩样品中的Zr、Hf、Nb等高场强元素含量均较低,其中Zr含量为54.3 × 10-6~ 177.0×10-6,多数<100.0×10-6,进一步表明岩体中的黑云母钾长花岗岩应属于高分异花岗岩。综上所述,笔者认为莫古吐花岗岩是岩浆经过强结晶分异作用后形成的高演化A型花岗岩。

    图 10.  104×Ga/Al−(Na2O+K2O)图解(a)与104×Ga/Al−Zr图解(b)(底图据Joseph et al., 1987)
    Figure 10.  104×Ga/Al−(Na2O+K2O) diagram(a) and 104×Ga/Al−Zr diagram of the Mogutu granite(b)(after Joseph et al., 1987)

    研究资料显示大兴安岭地区花岗岩的成岩物质来源一般较浅(蔡剑辉等,2006),岩浆源区主要为起源于地幔的年轻地壳物质组成(高源等,2013)。莫古吐花岗岩属于典型的A型花岗岩,是花岗岩中形成深度最浅的(张旗等,2012)。该类花岗岩的形成可能与幔源岩浆的底侵促使下地壳物质发生部分熔融的作用有关(Wu et al., 2002; Tapani Rämö et al., 2003)。微量元素原始地幔标准化蜘蛛图显示莫古吐花岗岩亏损P、Ti、Sr等元素,这些元素的贫化被认为是岩浆源于地壳物质的指示剂。Ti作为高场强元素,因不易进入熔体而残留在岩浆源区,因此,岩体中花岗岩元素Ti的亏损表明其成岩岩浆可能有壳源物质的参与或者直接来源于下地壳(Harris et al., 1992)。莫古吐花岗岩具有低Sr及负Eu异常的地球化学特征,这些特征被认为是岩体成岩物质来源于较浅岩浆源区的主要标志(蔡剑辉等,2006)。在花岗岩δEu−La/Yb图解中(图 11),莫古吐岩体样品的投点均位于壳源区域,表明岩体的成岩物质来源主要以壳源为主。根据上述讨论,结合前人研究成果,本文认为莫古吐花岗岩体的岩浆源区较浅,其成岩物质应主要以壳源物质为主。

    图 11.  莫古吐花岗岩δEu−La/Yb图解(底图据文献Joseph et al., 1987)
    Figure 11.  δEu−La/Yb diagram of the Mogutu granite (after reference Joseph et al., 1987)

    A型花岗岩的实质是在低压条件下部分熔融形成的花岗岩类,大多产于地壳伸展—减薄的构造背景中(张旗等,2012),将其进一步分为A1、A2两个亚类(Eby, 1990, 1992),其中A1型花岗岩形成于非造山环境,A2型花岗岩形成于造山后环境。莫古吐花岗岩Sr、Yb含量分别为25.5×10-6~116.0×10-6、2.9×10-6~6.1×10-6,与“南岭型”花岗岩(Sr<100.0× 10-6,Yb>2.0×10-6)特征相同,属于低Sr高Yb类型的造山后花岗岩(张旗等, 2006, 2008),在Nb−Ce−Y构造环境判别图解中(图 12),花岗岩样品的投点均在A2型花岗岩区域内,表明莫古吐花岗岩应属于A2型造山后花岗岩。不同学者通过对大兴安岭地区的火山岩及构造-岩浆事件进行深入研究后指出,中生代时期,该地区主要处于伸展的构造环境中(王彦斌等,2010; Wang et al., 2011; 许文良等,2013; 龙舟等,2017),这与形成A2型花岗岩的造山后伸展环境(张旗等,2008)相一致,因此,本文认为莫古吐岩体的成岩构造环境应属于伸展环境,在该环境下地壳处于伸展—减薄的状态。

    图 12.  莫古吐花岗岩Nb−Ce−Y构造环境判别图解(底图据文献Pearce et al., 1984
    A1—非造山花岗岩;A2—造山后花岗岩
    Figure 12.  Nb−Ce−Y discrimination diagram of tectonic setting of the Mogutu granite(after reference Pearce et al., 1984)
    A1-anorogenic granite; A2-post-orogenic granite

    目前,与赤峰北部地区早白垩—晚侏罗世花岗岩形成有关的地球动力学因素主要有3种观点:第一种是与地幔柱或板内作用有关(林强等,2004; 邵济安等,2010);第二种是与古太平洋俯冲作用有关(Zhang et al., 2010; Guo et al., 2015);第三种则是与蒙古—鄂霍茨克洋闭合所导致的碰撞后伸展作用有关(Fan et al., 2003; Ying, 2010; 顾玉超等,2017)。对于第一种观点,前人曾指出由于该地区地幔柱活动时间较短且远小于岩浆活动的持续时间(Wang et al., 2006),同时还缺少地幔柱活动的特征性岩石(辉长岩、玄武岩),因此该地区早白垩—晚侏罗世的花岗岩不可能与地幔柱活动有关;而古太平洋板块的俯冲作用在白垩世中晚期—古近纪才开始对中国东北部地区产生影响(李锦轶等,2004),同时,板块真正俯冲的时间只有125~110 Ma及43~0 Ma两个阶段,其作用对中国东北部地区中生代岩浆活动的影响十分有限(张旗,2013)。近年来,蒙古—鄂霍茨克洋的闭合作用对中国东北地区地质演化作用的影响越来越受到关注,研究者认为由蒙古—鄂霍茨克洋闭合所引起的造山带碰撞作用一直持续到晚侏罗世晚期才结束(佘宏全等,2012; 黄始琪等,2014),之后的碰撞伸展是导致大兴安岭地区地壳伸展—减薄的主因(Wang et al., 2011),中生代中晚侏罗世至早白垩世早期(170~ 135 Ma)的大规模成岩成矿事件也与蒙古—鄂霍茨克洋闭合导致的加厚陆壳拆沉作用及其相对应的碰撞后伸展背景有关(张雪冰,2017)。

    研究资料显示,大兴安岭中南段地区的侵入岩年龄具有自西向东逐渐变年轻的趋势(Meng,2003),这与蒙古—鄂霍茨克洋自西向东的剪刀式闭合特征相同(李鹏川等,2016),而该地区的火山活动也显示出相似的特征(Wang et al., 2006)。在时间上,莫古吐花岗岩形成于晚侏罗世(148.8~ 152.7 Ma),岩体成岩作用远在古太平洋板块俯冲作用之前就已发生;在空间上,中生代时期古太平洋板块俯冲作用的影响达不到大兴安岭地区(Shao et al., 2000邵济安等, 2001, 2015)。张旗等(2009)也认为中国东部燕山期的大规模岩浆活动与古太平洋板块俯冲作用无关。区域内的一些中生代花岗岩体,如胡都格绍荣岩体((129.9±1.4)Ma;李鹏川等,2016)、桦杆子沟岩体(136.6~137.34 Ma;彭青松等,2017)、土木富洲岩体((154 ± 1) Ma;杨奇荻等,2014)、杜尔基岩体((148.2±1.0)Ma;高飞等,2018)等,研究者认为这些岩体的形成都与蒙古—鄂霍茨克洋闭合作用有着密切的关系。综合前人研究成果,结合岩体成岩构造环境,本文认为蒙古—鄂霍茨克洋闭合碰撞后伸展作用是形成莫古吐岩体的主要地球动力学因素,其成岩过程可能为:在蒙古—鄂霍茨克洋构造体制的影响下,中生代晚期大兴安岭地区的岩石圈处于伸展—减薄状态,导致软流圈隆起,幔源岩浆发生底侵作用,促使上覆地壳发生部分熔融从而形成莫古吐花岗岩。

    (1)莫古吐黑云母钾长花岗岩锆石U−Pb年龄为(148.8±1.1)~(152.7±1.5)Ma,属于中生代晚侏罗世岩浆产物。

    (2)莫古吐花岗岩具有富硅(SiO2=73.64% ~ 80.86%)、富钾(K2O=2.6% ~6.0%)、贫铝(Al2O3= 10.57%~13.88%)的特点,REE型式呈燕式分布,负Eu异常明显(δEu=0.10~0.27),富集U、Th、Rb等大离子亲石元素,亏损P、Ti、Ba、Sr等元素,锆石饱和温度较高,为795~911℃,属于高演化A型花岗岩。

    (3)地球化学特征显示,莫古吐花岗岩体的岩浆源区较浅,成岩物质应主要以壳源物质为主。

    (4)莫古吐花岗岩属于A2型造山后花岗岩,形成于地壳伸展—减薄的构造环境中,蒙古—鄂霍茨克洋闭合碰撞后伸展作用是形成岩体的主要地球动力学因素。

  • 野外地质工作得到北京矿产地质研究院蒋斌斌、管育春等工程师的大力支持和帮助;测试工作得到合肥工业大学矿床成因与勘查技术研究中心矿物微区分析实验室汪方跃老师的热情帮助;审稿专家给论文提出了许多建设性的意见,特此感谢!

  • 图 1  中国东北区域构造单元划分(a,据Wu et al., 2011)、莫古吐地区区域地质图(b,据项目组内部资料修编)

    Figure 1. 

    图 2  莫古吐花岗岩野外照片

    Figure 2. 

    图 3  莫古吐花岗岩显微镜下照片

    Figure 3. 

    图 4  莫古吐花岗岩体锆石阴极发光图(CL)图像及测试位置

    Figure 4. 

    图 5  莫古吐花岗岩体锆石U−Pb谐和图

    Figure 5. 

    图 6  莫古吐花岗岩TAS分类图解(据Middlemost, 1994

    Figure 6. 

    图 7  莫古吐花岗岩SiO2−AR岩石系列判别图(据Rickwood, 1989)和A/CNK−ANK图解(据Maniar and Piccoli, 1989

    Figure 7. 

    图 8  莫古吐花岗岩稀土元素球粒陨石分布型式图(a)及微量元素原始地幔标准化蜘蛛图(b)

    Figure 8. 

    图 9  莫古吐花岗岩Rb−Sr−Ba图解(据Müller and Groves, 2001

    Figure 9. 

    图 10  104×Ga/Al−(Na2O+K2O)图解(a)与104×Ga/Al−Zr图解(b)(底图据Joseph et al., 1987)

    Figure 10. 

    图 11  莫古吐花岗岩δEu−La/Yb图解(底图据文献Joseph et al., 1987)

    Figure 11. 

    图 12  莫古吐花岗岩Nb−Ce−Y构造环境判别图解(底图据文献Pearce et al., 1984

    Figure 12. 

    表 1  莫古吐花岗岩LA−ICP−MS锆石U−Pb分析数据

    Table 1.  LA−ICP−MS zircon U−Pb age of the Mogutu granite

    下载: 导出CSV

    表 2  莫古吐花岗岩体主量元素(%)和微量元素(10−6)组成

    Table 2.  Major element (%) and trace element (10−6) composition of the Mogutu granite

    下载: 导出CSV
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出版历程
收稿日期:  2018-07-21
修回日期:  2019-05-16
刊出日期:  2021-02-25

目录

  • 表 1.  莫古吐花岗岩LA−ICP−MS锆石U−Pb分析数据
    Table 1.  LA−ICP−MS zircon U−Pb age of the Mogutu granite
     | Show Table
    DownLoad: CSV
  • 表 2.  莫古吐花岗岩体主量元素(%)和微量元素(10−6)组成
    Table 2.  Major element (%) and trace element (10−6) composition of the Mogutu granite
     | Show Table
    DownLoad: CSV