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江南造山带东段新元古代九岭复式岩体锆石U-Pb年代学及构造意义

段政, 廖圣兵, 褚平利, 黄文成, 朱延辉, 舒徐洁, 李长波

段政, 廖圣兵, 褚平利, 黄文成, 朱延辉, 舒徐洁, 李长波. 江南造山带东段新元古代九岭复式岩体锆石U-Pb年代学及构造意义[J]. 中国地质, 2019, 46(3): 493-516. DOI: 10.12029/gc20190305
引用本文: 段政, 廖圣兵, 褚平利, 黄文成, 朱延辉, 舒徐洁, 李长波. 江南造山带东段新元古代九岭复式岩体锆石U-Pb年代学及构造意义[J]. 中国地质, 2019, 46(3): 493-516. DOI: 10.12029/gc20190305
DUAN Zheng, LIAO Shengbing, CHU Pingli, HUANG Wencheng, ZHU Yanhui, SHU Xujie, LI Changbo. Zircon U-Pb ages of the Neoproterozoic Jiuling complex granitoid in the eastern segment of the Jiangnan orogen and its tectonic significance[J]. GEOLOGY IN CHINA, 2019, 46(3): 493-516. DOI: 10.12029/gc20190305
Citation: DUAN Zheng, LIAO Shengbing, CHU Pingli, HUANG Wencheng, ZHU Yanhui, SHU Xujie, LI Changbo. Zircon U-Pb ages of the Neoproterozoic Jiuling complex granitoid in the eastern segment of the Jiangnan orogen and its tectonic significance[J]. GEOLOGY IN CHINA, 2019, 46(3): 493-516. DOI: 10.12029/gc20190305

江南造山带东段新元古代九岭复式岩体锆石U-Pb年代学及构造意义

基金项目: 

中国地质调查局基础地质综合研究项目 12120113064800

中国地质调查局基础地质综合研究项目 121201008000160902

中国地质调查局基础地质综合研究项目 12121008000150004

中国地质调查局基础地质综合研究项目 121201008000160903

国家重点研发计划“华南中生代大花岗岩省形成的深部过程与成矿作用” 2016YFC0600203

详细信息
    作者简介:

    段政, 男, 1987年生, 助理研究员, 火成岩岩石学专业; E-mail:dz19882010@163.com

  • 中图分类号: P588.12+1

Zircon U-Pb ages of the Neoproterozoic Jiuling complex granitoid in the eastern segment of the Jiangnan orogen and its tectonic significance

Funds: 

China Geology Survey Project 12120113064800

China Geology Survey Project 121201008000160902

China Geology Survey Project 12121008000150004

China Geology Survey Project 121201008000160903

National key research and development program for deep process and mineralization of Mesozoic granitoid province in south China 2016YFC0600203

More Information
    Author Bio:

    DUAN Zheng, male, born in 1987, assistant researcher, majors in igneous petrology; E-mail:dz19882010@163.com

  • 摘要:

    江南造山带东段的九岭岩体为华南分布面积最大的新元古代花岗质侵入体。据其岩石组合、结构构造及野外侵入关系,可将其解体为由早到晚3个侵入序次的复式岩体,依次为黑云母花岗闪长岩、英云闪长岩及黑云母二长花岗岩。其中,黑云母花岗闪长岩分布面积最广,黑云母二长花岗岩次之,英云闪长岩分布面积最小,围岩为新元古代双桥山群浅变质岩系。LA-ICP-MS锆石U-Pb定年结果表明,黑云母花岗闪长岩、英云闪长岩、黑云母二长花岗岩分别形成于821.6~824.0 Ma、819.5~823.6 Ma、820.4~824.5 Ma,指示它们基本同时侵位,但三者均具有自SE向NW时代变新的趋势。九岭岩体与围岩(双桥山群)的侵入接触面具有南陡北缓、角岩化带南窄北宽且围岩捕掳体及捕获锆石也呈南少北多的特征,表明九岭岩体SE侧岩体剥蚀深度强于NW侧,可能暗示了新元古代华夏板块向扬子板块碰撞拼贴过程中,研究区SE侧岩浆起源深度较深,剥蚀程度较高,且形成时代较早,并逐渐向NW侧迁移(岩浆起源深度变浅、时代变新)。

    Abstract:

    Located in eastern Jiangnan orogen, the Jiuling pluton is the largest Neoproterozoic granitoid intrusion in South China. According to mineral assemblage, structure and intrusive contact relationships, Jiuling pluton can be divided into complex massif with 3 intrusion orders, followed by biotite-granodiorite, tonalite and biotite-monzogranite from early to late respectively. Among them, granodiorite are distributed most widely, followed by biotite-monzogranite, while tonalite is only distributed in a minimum area. They intruded into the surrounding epimetamorphic rocks of Neoproterozoic period. The LA-ICP-MS zircon U-Pb dating results show that the biotite-granodiorite, tonalite and biotite-monzogranite were formed in 821.6-821.6 Ma, 819.5-823.6 Ma and 820.4-824.5 Ma, respectively, which indicates that they belong to the product of contemporary magmatic activity. On the whole, however, the ganitoids tend to be younger from the southeast side to the northwest side. Besides, the dip angle of contact interface between Jiuling pluton and surrounding rocks (Shuangqiaoshan Group) is steep in the south and smooth in the north, hornfelsic belt is narrow in the south and wide in the north, and the xenoliths from the surrounding rock (Shuangqiaoshan Group) and the captured zircons also tend to decrease in size from south to north. These characteristics show that the rocks on the southeast side was eroded deeper than those on the northwest side, probably implying that, during the collision between Cathaysia plate and Yangtze plate in Neoproterozoic, the original depth of the granitic magma on the southeast side was deeper, the denudation was more intense, and the magma was formed earlier than the magma on the northwest side and gradually migrated northwestward, i.e., the origin depth of magma became shallow and the formation time became younger.

  • 江西金属矿产素有南钨北铜的分布格局, 近年赣北地区新发现了大湖塘与朱溪两个世界级钨矿床, 彻底改变江西乃至世界钨资源的分布格局。朱溪原为热液脉型小铜矿, 断断续续采探十余年, 一直没有取得突破性进展。2009年, 江西省地勘基金以系列成矿理论为指导、按照“就矿找矿、以脉找体”思路, 揭示朱溪“上铜下钨”矿化分带模式, 在铜矿体的深部探获了延伸稳定(超2000 m)、厚度大(平均150 m余)、品位高(平均0.571%)的钨矿体, 矿床资源储量世界第一(Wang et al., 2014; 王先广等, 2015, 2018; 胡正华等, 2018a, 2018b), 目前矿床仍在勘查, 钨资源规模有望达到500万t。九瑞矿集区位于长江中下游Cu-Au-Mo(Fe)成矿带的转折端, 是中国铜矿大型资源基地, 查明铜资源储量313万t, 约占长江中下游铜总量的1/3。矿集区内勘查工作始于20世纪50年代, 开始以寻找铁矿为目的, 历经60余年的勘查总结出九瑞地区“上铁下铜(钼)”的矿化分带规律, 并发现了武山、城门、洋鸡山等一批大型铜金矿床。赣北地区钨矿存在3期成岩成矿作用, 自早至晚分别为: 160 Ma→150~145 Ma→135~125 Ma, 并且以150~145 Ma、135~125 Ma这两期为主(胡正华, 2018c)。大湖塘和朱溪、阳储岭钨矿床的成岩时代基本一致, 均为150~145 Ma(胡正华等, 2018a, 2018b, 2018c)。长江中下游成矿带鄂东南、宁镇、庐枞等矿集区亦发现了钨矿床(朱增青, 1987; 徐跃通等, 1992; 聂利青等, 2016)。通江岭铜钨矿床位于九瑞矿集区北侧, 是江西省地质勘查基金重点勘查项目, 近年通过系统勘查在矿区深部新发现了厚大的铜钨矿体, 成为九瑞矿集区新发现钨铜矿体的首个矿床。通江岭矿区深部钨铜矿体的发现, 极大丰富了九瑞矿集区找矿空间、找矿思路和找矿方向。通江岭铜钨矿床的研究程度较低, 仅进行了少量矿床地质特征的研究(胡正华等, 2018b), 本文拟通过对通江岭成矿岩浆岩年代学研究, 揭示矿床成矿岩浆岩形成时代, 为九瑞矿集区仍至长江中下游成矿带研究及下一步找矿方向提供建议。

    九瑞矿集区位于扬子板块南东缘襄广断裂与阳常断裂交汇处(图 1), 区内地层具有双层结构, 基底为新元古代双桥山群, 盖层从震旦纪至第四纪地层均有, 其中与成矿密切相关的地层主要为奥陶系与石炭系碳酸盐岩, 为区内主要赋矿地层。矿集区内褶皱与断裂构造发育, 褶皱为一系列轴向NE的褶皱带(王先广等, 2014); 断裂构造主要为NW—NNW和NE—NNE向两组, 这两组断裂构造的交汇部位是主要控岩控矿构造(翟裕生等, 1999; 包家宝等, 2002; 胡正华, 2015a)。矿集区内共出露31个岩体, 呈岩株、岩墙、岩脉状产出, 单个岩体出露面积为0.04~1.6 km2(翟裕生等, 1999)。岩株受NW—NNW向隐伏基底断裂控制, 呈等距状产出。岩脉受NE—NEE向断裂、NE向褶皱带、层间不整合面及层内薄弱面贯入式侵位产出, 自北至南发育6个岩浆岩带:即, 东雷湾—通江岭花岗闪长斑岩亚带、宝山—大桥花岗闪长斑岩亚带、宋家湾—武山花岗闪长斑岩亚带、大冲—丁家山石英闪长玢岩—花岗闪长斑岩亚带、城门山—十六公里花岗闪长斑岩—石英闪长玢岩亚带、沙河—狮子山花岗闪长斑岩—石英闪长玢岩亚带。区内矿产以铜、钼、金为主, 成矿岩浆岩均为高钾钙碱性Ⅰ型岩浆岩系列, 成岩时代集中于145 Ma左右(吴良士等, 1997; 李进文等, 2007; 蒋少涌等, 2008; 陈志洪等, 2011; 胡正华等, 2015a, 2018b, 2018c)。

    图  1  长江中下游九瑞矿集区地质简图(据Pan et al., 1999修改)
    (A—长江中下游构造简图;B—九瑞矿集区地质简图)
    1—奥陶系;2—志留系;3—泥盆—石炭系;4—二叠系;5—三叠系;6—第四系;7—岩体;8—地质界线/河流;9—矿床(点)位置及名称;10—城市位置及名称;11—矿集区;12—通江岭矿区位置
    Figure  1.  Simplified geological map of the Jiurui ore concentration area in the middle-lower Yangtze River Valley (modified from Pan et al., 1999)
    (A-Structure diagram of the middle-lower Yangtze River Valley; B-Geological map of the Jiurui ore concentration area)
    1-Ordovician; 2-Silurian; 3-Devonian, Carboniferous; 4-Permian; 5-Triassic; 6-Quaternary; 7-Lithesome; 8-Geological boundary/river; 9-Locations and names of deposits; 10-Locations and names of cities; 11-Ore concentration areas; 12-Location of Baoshan ore deposit

    通江岭矿区位于九瑞地区龙泉古寺—牛头山背斜核部。区内出露的地层自老至新有中二叠统茅口组(P2m)、上二叠统龙潭组(P3l)、上二叠统长兴组(P3c)、下三叠统殷坑组(T1y)、下三叠统青龙组(T1q)、下三叠统周冲村组(T1z)(图 2), 地层总体走向北东, 以龙泉古寺—牛头山背斜核部为界。区内断裂构造发育, 根据走向可分为3组:北东向(F1、F2、F3)、北西向(F4)、近南北向(F5)断裂, 其中北东向F2断裂为区内主要控岩控矿构造。花岗闪长斑岩沿龙泉古寺—牛头山背斜核部与F2断裂呈NE向岩墙展布。

    图  2  九瑞矿集区通江岭矿区地质简图
    1—第四系;2—下三叠统周冲村组;3—下三叠统青龙组;4—中二叠统茅口组;5—花岗闪长斑岩;6—断层及编号/地质界线;7—勘探线及其编号;8—钻孔及其编号
    Figure  2.  Simplified geological map of the Tongjiangling ore deposit in the Jiurui ore concentration area
    1-Quaternary; 2-Lower Triassic Zhouchongcun Formation; 3-Lower Triassic Qinglong Formation; 4-Middle Permian Maokou Formation; 5-Granodiorite porphyry; 6-Fault and its number/ geological boundary; 7-Exploration line and its number; 8-Drill hole and its number

    通江岭铜钨矿由14条矿体(M1~M14)组成, 总体走向NEE, 倾向东, 呈似层状、透镜状产出于花岗闪长斑岩与茅口组(P2m)碳酸盐的内、外接触带(图 3)。矿石类型以铜矿石和铜钨矿石为主; 矿石矿物以白钨矿、黄铜矿为主, 脉石矿物长石、石英、绿泥石、高岭石、石榴子石、透辉石、透闪石、长石、石英、绿泥石、方解石等为主; 矿石构造以脉状、浸染状、块状为主; 矿石结构以结晶结构、交代结构和固溶体分离结构为主。区内矿化垂向上具有“上铜下钨铜”的分带模式, 上部矿化以铜矿化为主, 矿石矿物主要为黄铜矿, 脉石矿物主要为长石、石英、高岭土、绿泥石和石榴子石等矽卡岩矿物; 黄铜矿主要以脉状、浸染状、块状赋存于矽卡岩、矽卡岩化大理岩和蚀变花岗闪长斑岩中。下部以钨铜矿化为主, 矿石矿物以黄铜矿、白钨矿为主, 脉石矿物主要为石榴子石、透辉石、透闪石等矽卡岩矿物。

    图  3  通江岭矿区9号勘探线剖面图
    1—下三叠统青龙组;2—中二叠统茅口组;3—花岗闪长斑岩;4—铜矿体;5—铜钨矿体;6—矿体及编号;7—地质界线;8—断层及编号;9—锆石U-Pb样采集位置及编号
    Figure  3.  Geological section along No. 9 exploration line in the Tongjiangling minging area
    1-Lower Triassic Qinglong Formation; 2-Middle Permian Maokou Formation; 3-Granodiorite porphyry; 4-Copper orebody; 5-Coppertungsten orebody; 6-Orebody and its number; 7-Geological boundary; 8-Fault and its number

    M9矿体为区内规模最大的铜钨矿体, 走向延伸超1200 m, 倾向延深超500 m, 真厚度10.43~27.66 m; Cu品位多介于0.45%~0.68%, 最高可达9.73%; WO3品位多介于0.05%~0.17%, 局部伴生Mo、Zn、Ag等, M9矿体矿石矿物以黄铜矿、白钨矿为主, 矿石构造以浸染状、细脉—网脉状为主。矿体具有“上铜下钨铜”的矿化分带特征。

    锆石U-Pb样品采自9线ZK0903孔885 m处M9矽卡岩矿体底板的花岗闪长斑岩(图 3)。花岗闪长斑岩(图 4)呈灰白-浅灰色, 斑状结构、块状构造, 斑晶(约64%)包括斜长石(约30%)、石英(约20%)、钾长石(约10%)、黑云母(约4%)。斜长石斑晶, 半自形板状, 粒径2~5 mm, 聚片双晶和卡钠复合双晶发育, 局部发育环带构造, 部分绢云母化; 石英斑晶, 他形粒状, 粒径2~3.5 mm。钾长石斑晶, 半自形粒状为主, 粒径2 mm左右, 常见高岭石化; 黑云母斑晶, 片状, 片径2~2.5 mm, 褐色, 多色性浅黄褐—黄褐色, 常见绿泥石化。基质(约36%)呈显微粒状结构, 由长英质及少量黑云母构成, 粒径一般为0.05~2 mm, 长石类可见绢云母化、高岭石化。

    图  4  通江岭矿区花岗闪长斑岩照片
    Figure  4.  Photographs of granodiorite porphyry in the Tongjiangling mining area

    锆石U-Pb测年样品, 先破碎至60目, 采用浮选、磁选方法初步分离筛选出锆石, 然后在双目镜下将挑选色泽、晶形较好, 透明度较高的锆石颗粒, 用于锆石制靶, 拍摄阴极发光(CL)图像, 观察锆石内部结构, 选择环带清晰的岩浆岩锆石作为待测点。LA-ICP-MS锆石U-Pb年龄的测试工作在中国地质科学院矿产资源研究所LA-ICP-MS实验室完成, 测试仪器为Agilent 7500a型ICP-MS与激光剥蚀系统ComPex 102 Excimer。为确保LA-ICPMS锆石U-Pb年龄测试的精确度, 每测试5个点加测标样91500和NIST610一次, 并测量一个锆石Plesovice来确定仪器运行状态是否正常。锆石年龄测试结果用Isoplot 3.0程序处理, 具体分析步骤和数据处理过程参见文献(柳小明等, 2002)。

    花岗闪长斑岩内锆石无色, 透明, 主要呈长柱状, 部分锆石内见细小的包裹体及裂纹(图 5), 锆石粒径在50 μm×110 μm~90 μm×180 μm。阴极发光图像显示锆石成分含量比较均匀, 主要以振荡环带为主, 少量锆石发育扇状环带和无环带现象。为确保定年结果的准确性, 实验中选择具有明显振荡环带锆石的边缘进行测试。本样品中挑取的锆石长轴和短轴之比在2:1~4:3 (图 5), 测点Th、U含量分别为107~266 μg/g, 269~653 μg/g(表 1)。Th/U比值大多介于0.34~0.71 (表 1), 与岩浆锆石的特征相似(吴元保等, 2004)。经测定15个有效锆石测点的207Pb/235U、206Pb/238U分析结果在误差范围内基本一致, 206Pb/238U年龄的加权平均值为(143.31±2.70)Ma (MSWD=0.62, n=15)(表 1, 图 6)。

    图  5  通江岭矿区花岗闪长斑岩锆石阴极发光及测点位置图
    Figure  5.  Zircon cathodoluminescence of granodiorite porphyry in the Tongjiangling mining area and map of measuring points
    表  1  通江岭矿区花岗闪长斑岩LA-ICP-MS锆石U-Pb年龄分析结果
    Table  1.  LA-ICP-MS zircon U-Pb age data of granodiorite porphyry in The Tongjiangling mining area
    下载: 导出CSV 
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    图  6  通江岭矿区花岗闪长斑岩LA-ICP-MS锆石U-Pb年龄谐和图
    Figure  6.  LA ICP-MS zircon U-Pb age concordia diagram of granodiorite porphyry in the Tongjiangling mining area

    通江岭矿区自花岗闪长斑岩体至茅口组碳酸盐岩具有绿泥石化-硅化-高岭土化(花岗闪长斑岩) →石榴子石-透辉石-透闪石矽卡岩→矽卡岩化化大理岩→大理岩蚀变分带, 区内黄铜矿、白钨矿物等矿石矿物主要呈细脉状、浸染状产出于花岗闪长岩与茅口组碳酸盐岩接触带的矽卡岩中, 部分以浸染状产出于蚀变花岗闪长斑岩中, 矿体垂向上自围岩至岩体(自浅至深)显示出“中温→中高温”的元素分带性, 即具有“上铜下钨铜”的矿化分带特征, 与典型的斑岩-矽卡岩型矿床的蚀变分带特征基本一致(王先广等, 2015; 唐菊兴等, 2017; 胡正华等, 2018c), 指示出花岗闪长斑岩为通江岭矿床的成矿岩浆岩, 矿床类型为斑岩-矽卡岩型。通江岭铜钨矿成矿花岗闪长斑岩锆石U-Pb年龄为(143.31±2.70) Ma(MSWD=0.62, n=15), 代表了成矿花岗闪长斑岩的成岩年龄。

    长江中下游成矿带鄂东南、宁镇、庐枞等矿集区已发现钨矿体或钨矿化体的报道, 如鄂东南矿集区阳新阮家湾和傅家山(朱增青, 1987; 徐跃通等, 1992)、大冶龙角山等矽卡岩型钨铜钼矿床(朱增青, 1987); 宁镇矿集区谏壁发现过中型斑岩型钨、钼矿床(杨松生等, 1985; 马春等, 2003); 庐枞矿集区东顾山矽卡岩型钨多金属矿床(聂利青等, 2016)。聂利青等(2016)提出长江中下游成矿带除铁、铜外, 亦具有良好找钨前景。九瑞矿集区受长江断裂西段北西西向的鄂州—九江深断裂带上盘控制, 两端为北北东向的麻城—湘东、赣江断裂带截接制约, 并与瑞昌弧形构造东部的北东东向反S形褶皱与走向断裂以及北北西向张裂隙带复合, 形成一个以北西西向为主轴的菱形构造网络结点控制着内岩浆岩侵位以及矿床的分布(包家定等, 2002)。矿集区内存在“多层结构”赋矿模式, 即层状矽卡岩矿体赋存于奥陶系、石炭系、二叠系、三叠系碳酸盐岩地层, 以石炭系地层为主(王先广等, 2014; 胡正华等, 2015a)。近年, 赣北地区新发现的朱溪世界最大钨矿床、武宁县东坪超大型石脉型黑钨矿床均具有上铜下钨的分带特征。朱溪钨矿的成岩成矿时代为145 Ma左右(王先广等, 2015; 胡正华, 2018c), 主矿体赋存于花岗岩与黄龙组碳酸盐岩接触带的矽卡岩中。近年, 江西省地质勘查基金管理中心在九瑞矿集区武山、南港矿区边深部均已发现了似层状斑岩-矽卡岩型铜钨矿体, 主要赋存于黄龙组碳酸盐岩与成矿岩浆岩的接触带附近, 成矿岩体均为花岗闪长斑岩或石英斑岩, 成矿岩年龄均为145 Ma左右(胡正华等, 2015a); 并且垂向上均具有“上铜下钨铜”的矿化分带特征, 中武山矿区深部的矽卡岩型钨铜矿体中钨资源规模达到大型。上石炭统黄龙组碳酸盐岩是赣北地区矽卡岩型矿床的主要赋矿围岩, 通江岭铜钨矿区目前仅在二叠系碳酸盐岩与花岗闪长斑岩接触带发现了斑岩-矽卡岩型铜钨矿体。通江岭矿区ZK0903孔790.15 m处花岗斑岩与碳酸盐岩接触带的矽卡岩中, 发现真厚度十余米的铜(钨)矿体, Cu品位多介于0.45%~0.68%, 最高可达9.73%; WO3平均品位0.067%, 最高达0.17%。区内其他钻孔在矽卡岩中亦揭示了钨矿化现象, 进一步表明通江岭矿区深部具有发现厚大钨矿体的潜能, 尤其是在矿区深部石炭系、奥陶系碳酸盐岩与花岗闪长斑岩的接触带或五通面、奥陶—志留系所形成的硅钙界面, 找矿潜能大。

    (1) 通江岭铜钨矿成矿岩浆岩为花岗闪长斑岩, 其锆石U-Pb年龄为(143.31±2.70) Ma (MSWD=0.62, n=15), 代表了成矿花岗闪长斑岩成岩年龄。

    (2) 九瑞矿集区具有“上铜下钨铜”的矿化分带趋势, 通江岭矿区石炭系、奥陶系碳酸盐岩与花岗闪长斑岩接触带或五通面、奥陶—志留系所形成的硅钙界面, 找钨潜能大。

  • 图  1   九岭岩体地质简图(a)、华南前寒武纪岩石分布地质简图(b,修改自Yao et al., 2014)及赣西北修水—武宁地区地质简图(c,据1: 5万罗溪幅、黄沙桥幅、石门楼幅地质图改绘)

    Figure  1.   Simplified geological map of Jiuling pluton (a), simplified geological map of South China (b, modified from Yao et al., 2014), simplified geological map of Xiushui-Wuning area in northwest Jiangxi Province (c, modified from 1: 50, 000 Luoxi Sheet, Huangshaqiao Sheet, Shimenlou Sheet geological map)

    图  2   研究区新元古代花岗岩类野外露头及岩石学特征

    a—研究区新元古代黑云母花岗闪长岩侵入于双桥山群变细砂岩之中;b—黑云母花岗闪长岩镜下特征,正交偏光;c—英云闪长岩镜下特征;d, e—钾长石巨斑晶黑云母二长花岗岩镜下特征(d,正交偏光)及野外特征(e);f—黑云母花岗闪长岩中堇青石显微特征,沿裂理绢云母化,且锆石包裹体周围发育柠檬黄多色晕,左为单偏光,右为正交偏光; Olg—更长石;Kf—钾长石;Ads—中长石;Qz—石英;Bt—黑云母;Crd—堇青石;Ser—绢云母;Mu—白云母;Zr—锆石

    Figure  2.   Petrological and field outcrops characteristics of Neoproterozoic granitoids in the study area

    a-Neoproterozoic biotite granodiorite intruding into meta-sandstone of Shuangqiaoshan Group in the study area; b-Microscopic characteristics of biotite-granodiorite, perpendicular polarized light; c-Microscopic characteristics of tonalite; d, e-Microscopic characteristics of biotitemonzogranite with giant potassium feldspar phenocryst (d) and its outcrops characteristics in the field (e); f-Microscopic characteristics of the cordierite with sericitization along its rifts and showing the lemon yellow multi-color halo developed around the zircon inclusions from biotite granodiorite, the right side is perpendicular polarized light, the left side is plane polarized light. Olg-Oligoclase; Kf-K-feldspar; Ads-Adesine; Qz-Quartz; Bt-Biotite; Crd-Cordierite; Ser-Sericite; Mu-Muscovite; Zr-Zircon

    图  3   研究区新元古代花岗岩接触关系地质简图

    a—英云闪长岩侵入于黑云母花岗闪长岩之中;b—黑云母二长花岗岩侵入于英云闪长岩之中;c—黑云母二长花岗岩侵入于黑云母花岗闪长岩之中;d—研究区北部黑云母花岗闪长岩与双桥山群侵入接触关系;e—研究区南部黑云母花岗闪长岩与双桥山群侵入接触关系

    Figure  3.   Geological sketch map of contacting relationships of the Neoproteozoic granitoids in the study area

    a-Tonalite intruding the biotite-granodirite; b-Biotite-monzogranite intruding the tonalite; c- Biotite-monzogranite intruding biotite-granodirite; d-The contacting relationship between the biotite-granodiorite and the Shuangqiaoshan Group in northern study area; e-The contacting relationship between the biotite-granodiorite and the Shuangqiaoshan Group in northern study area

    图  4   研究区九岭岩体锆石CL图像及测点位置和结果

    Figure  4.   CL images, site of analyzed point and dating data of zircons from Neoproterozoic granites in the study area

    图  5   研究区新元古代黑云母花岗闪长岩锆石U-Pb年龄谐和图

    Figure  5.   U-Pb concordia diagram of the zircons from Neoproterozoic biotite granodiorite

    图  6   研究区新元古代英云闪长岩锆石U-Pb年龄谐图

    Figure  6.   U-Pb concordia diagram of the zircons from Neoproterozoic tonalite

    图  7   研究区新元古代黑云母二长花岗岩锆石U-Pb年龄谐图

    Figure  7.   U-Pb concordia diagram of the zircons from Neoproterozoic biotite adamellite

    表  1   江南造山带新元古代花岗岩年代学资料

    Table  1   Geochronological data for Neoproterozoic granites in Jiangnan orogen

    下载: 导出CSV

    表  2   九岭岩体LA-ICP-MS锆石U-Pb分析数据

    Table  2   LA-ICP-MS zircon U-Pb dating data of Jiuling Pluton

    下载: 导出CSV
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出版历程
  • 收稿日期:  2017-07-24
  • 修回日期:  2018-01-17
  • 网络出版日期:  2023-09-25
  • 刊出日期:  2019-06-24

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