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    西大别南缘印支期吕王-高桥-永佳河构造混杂岩带的厘定及其构造意义

    徐扬 杨振宁 邓新 王令占 刘浩 金鑫镖 张维峰 魏运许 彭练红 黄海永

    徐扬, 杨振宁, 邓新, 王令占, 刘浩, 金鑫镖, 张维峰, 魏运许, 彭练红, 黄海永, 2021. 西大别南缘印支期吕王-高桥-永佳河构造混杂岩带的厘定及其构造意义. 地球科学, 46(4): 1173-1198. doi: 10.3799/dqkx.2020.311
    引用本文: 徐扬, 杨振宁, 邓新, 王令占, 刘浩, 金鑫镖, 张维峰, 魏运许, 彭练红, 黄海永, 2021. 西大别南缘印支期吕王-高桥-永佳河构造混杂岩带的厘定及其构造意义. 地球科学, 46(4): 1173-1198. doi: 10.3799/dqkx.2020.311
    Xu Yang, Yang Zhenning, Deng Xin, Wang Lingzhan, Liu Hao, Jin Xinbiao, Zhang Weifeng, Wei Yunxu, Peng Lianhong, Huang Haiyong, 2021. Identification of Indosinian Tectonic Mélange Belt in West Dabie Orogenic Belt and Its Geological Significance. Earth Science, 46(4): 1173-1198. doi: 10.3799/dqkx.2020.311
    Citation: Xu Yang, Yang Zhenning, Deng Xin, Wang Lingzhan, Liu Hao, Jin Xinbiao, Zhang Weifeng, Wei Yunxu, Peng Lianhong, Huang Haiyong, 2021. Identification of Indosinian Tectonic Mélange Belt in West Dabie Orogenic Belt and Its Geological Significance. Earth Science, 46(4): 1173-1198. doi: 10.3799/dqkx.2020.311

    西大别南缘印支期吕王-高桥-永佳河构造混杂岩带的厘定及其构造意义

    doi: 10.3799/dqkx.2020.311
    基金项目: 

    湖北省自然科学基金项目 2020CFB344

    中国地质大学构造与油气资源教育部重点实验室开放基金项目 TPR-2019-07

    同位素地球化学国家重点实验室开放-合作基金项目 SKLabIG-KF-18-13

    中国地质调查局地调项目 DD20190050

    详细信息
      作者简介:

      徐扬(1985-), 男, 博士, 高级工程师, 主要从事大别地区构造地质学方向的调查与研究.ORCID: 0000-0002-1629-159X.E-mail: xuyang_0112@163.com

      通讯作者:

      邓新, E-mail: 342821281@qq.com

    • 中图分类号: P548;P56

    Identification of Indosinian Tectonic Mélange Belt in West Dabie Orogenic Belt and Its Geological Significance

    • 摘要: 在西大别造山带的区调工作中,新识别出一系列中元古代末-新元古代的岩石-构造单元,它们沿着吕王-高桥-永佳河一线展布,并构成一条NNW-SEE向展布的构造混杂岩带.该混杂岩带主要由超镁铁质-镁铁质岩、硅泥质岩、石英质岩、大理岩、含碳陆源碎屑岩、双峰式火山岩以及卷入其中的榴辉岩等多种变质岩块(片)共同组成,并赋存于一套遭受了强烈剪切变形的泥质片岩之中.混杂岩带内各岩块(片)的原岩年龄跨度较大(>4亿年),分别集中在1 200~1 100 Ma和800~700 Ma之间.锆石记录的变质年龄和云母的冷却年龄则主要集中在240~200 Ma之间.结合接触关系、岩性组合、年代学及地球化学数据的综合研究认为,混杂岩带的物质来源既包括中元古代末-新元古代早期的弧-弧后盆地系统的沉积岩-火山岩-侵入岩;也包括叠置其上的新元古代中-晚期大陆裂解期的沉积岩-火成岩.这些不同时代、不同性质岩石在三叠纪不同程度地卷入了华南陆块北缘向华北陆块之下的俯冲,而后快速折返,最终沿着区域上折返断裂(桃花-七角山断裂)就位于西大别造山带之中,形成一条包含高压-超高压变质岩的三叠纪构造混杂岩带.混杂岩带内新厘定的中元古代末弧-弧后岩浆-沉积事件,可与大洪山-黄陵庙湾同时期的地质事件对比,它们共同揭示扬子北缘曾经存在一条中元古代末-新元古代早期的俯冲岩浆带.

       

    • 图  1  西大别造山带的大地构造位置(a)及其构造单元划分简图(b)

      F1.龟山-梅山断裂;F2.军师岭断裂;F3.七角山-桃花断裂;F4.襄樊-广济断裂. 据Wu and Zheng (2013)Liu et al. (2015)修改

      Fig.  1.  Tectonic location and subdivisions of the West Dabie orogenic belt, Central China

      图  2  吕王-高桥-永佳河构造混杂岩带地质简图

      标记*的年龄来自湖北省地质调查院(2018);标记#的年龄来自Zhou et al. (2015);没有标记的年龄为本文数据.F5.河口-卡房断裂;F6.庙咀-八里湾断裂. 据湖北省地质调查院(2018)和本文数据修改

      Fig.  2.  Geological sketch map of the Lüwang-Gaoqiao-Yongjiahe tectonic mélange belt in West Dabie orogenic belt

      图  3  吕王-高桥-永佳河构造混杂岩带构造剖面

      AB.新屋基剖面;CD.新寨剖面;EF.康家湾剖面.剖面位置见图 2,岩块(片)代号见表 1. 剖面AB湖北省地质调查院(2018)修改

      Fig.  3.  Cross sections of the Lüwang-Gaoqiao-Yongjiahe tectonic mélange belt in West Dabie orogenic belt

      图  4  吕王-高桥-永佳河构造混杂岩带野外照片和显微照片

      a~d.变超基性岩岩块;e~f.斜长角闪片岩中夹的褶皱变形的条带状石英岩(硅质岩);g.旋转的基性岩块;h.基性岩块中剪切变形;i.云母片岩夹条带状石英岩(硅质岩);j~l.大理岩及其侵入其中的基性岩;m.厚层状半石墨片岩;n.弱变形的辉长岩旋转岩块;o~p.康家湾榴辉岩(DW101);q~r.操家岗榴闪岩(TK-9-4);s.泥质基质;t.岩块间剪切破碎形成的细粒组分基质.矿物缩写:omp.绿辉石;Grt.石榴石;Hbl.角闪石;Ab.钠长石;Phe.多硅白云母

      Fig.  4.  Representative photographs and photomicrographs for the Lüwang-Gaoqiao-Yongjiahe tectonic mélange belt

      图  5  吕王-高桥-永佳河构造混杂岩带代表性锆石阴极发光图像及锆石稀土元素分布模式

      黄色圆圈和数值分别代表定年分析点位置及其207Pb/206Pb(> 1 000 Ma)或206Pb/238U(< 1 000 Ma) 年龄值(Ma);绿色圆圈和数值分别为Hf同位素分析点位置及其εHf(t)值. 球粒陨石标准化数据引自Sun and McDonough (1989). 矿物缩写:Grt.石榴石

      Fig.  5.  Chondrite-normalized REE patterns for all dated zircons and cathodoluminescence images for representative zircon grains

      图  6  吕王-高桥-永佳河构造混杂岩带内岩石锆石U-Pb年龄谐和图

      蓝色和灰色数据点分别为岩浆锆石微区上获得的谐和、不谐和年龄点;绿色的粗细和细线数据点分别为变质锆石微区上获得的谐和、不谐和年龄点.样品PM208-30和PM208-52年龄数据引自湖北省地质调查院(2018);其他数据为本文数据

      Fig.  6.  Zircon U-Pb concordia diagrams for the rocks from the Lüwang-Gaoqiao-Yongjiahe tectonic mélange belt

      图  7  球粒陨石标准化稀土元素配分模式和原始地幔标准化微量元素蛛网图

      标准化值自Sun and McDonough (1989)

      Fig.  7.  Chondrite-normalized REE patterns and primitive mantle-normalized spider diagrams for the Lüwang-Gaoqiao-Yongjiahe tectonic mélange belt

      图  8  康家湾榴辉岩和新寨变基性岩的La/Nb vs. La图解(李曙光, 1993) (a),Nb/Th vs. La/Nb图解(Fan et al., 2004) (b);(Nb/La)PM vs. (La/Sm)N图解(Sun and McDonough, 1989) (c);(Hf/Sm)N vs. (Nb/La)N图解(Laflèche et al., 1998) (d)

      Fig.  8.  Plots of (a) La/Nb vs. La (Li, 1993); (b)Nb/Th vs. La/Nb(Fan et al., 2004); (c)(Nb/La)PM vs. (La/Sm)N (Sun and McDonough, 1989); (d)(Hf/Sm)N vs. (Nb/La)N (Laflèche et al., 1998)

      图  9  康家湾榴辉岩和新寨变基性岩稳定元素构造判别图解

      a.V/Ti vs. Zr图解, 据Woodhead et al.(1993);b.(Tb/Ta)N vs. (Th/Ta)N图解, 据Fekkak et al.(2001);c.Th/Yb vs. Nb/Yb图解, 据Dilek and Furnes(2011);d. Ce/Nb vs. Th/Nb图解, 据Taylor and Martinez(2003).图b中缩写:N-MORB.正常洋中脊玄武岩; E-MORB.富集洋中脊玄武岩岩; BAB.弧后盆地玄武岩; CFB.大陆溢流玄武岩;OIA.马里亚纳型洋内弧;IAB.弧间玄武岩;OIB.洋岛玄武岩;CWPAB.大陆板内碱性玄武岩;CAMB.主动陆缘玄武岩

      Fig.  9.  Diagrams showing the tectonic setting of the metamafic rocks from the Xinzhai and Kangjiawan areas

      图  10  吕王-高桥-永佳河构造混杂岩带从原岩形成(a~b)、到大陆俯冲(c)和碰撞后折返(d)演化

      a.中元古代末-新元古代早期扬子北缘的弧-弧后盆地;b.新元古代中-晚期大陆裂谷盆地沉积了红安岩群;c.早三叠世,扬子北缘不同时代性质的岩石卷入华南向华北的俯冲,遭受了不同程度的变质;d.中-晚三叠世俯冲的板片折返、与未卷入深俯冲的低级变质岩进一步混合,最终在地表形成包含榴辉岩包体的构造混杂岩带.图c和图d据Wu and Zheng(2013)修改

      Fig.  10.  Sketched diagrams showing the formation of the Lüwang-Gaoqiao-Yongjiahe tectonic mélange belt through protolith emplacement and tectonic transition from continental subduction to the final exhumation in the post-collisional stage

      表  1  西大别吕王-高桥-永佳河构造混杂岩带岩石-构造单元划分

      Table  1.   The partition scheme of different types of block and matrix in the Lüwang-Gaoqiao-Yongjiahe tectonic mélange belt

      构造相 岩块(片)和基质 岩性类型(组合) 锆石U-Pb年龄
      岩浆锆石年龄 变质锆石年龄
      / 基质 泥质变质岩为主 强烈剪切变形的(石墨)白云母片岩、石墨片岩、榴云片岩 / /
      高压-超高压相 岩块(片) 高压-超高压变质岩(ec) 榴辉岩及其退变榴闪岩 1 200~1 100 Ma;1 188 Ma#;765 Ma@ 295 Ma和220 Ma;245~221 Ma#;232 Ma@
      陆内裂谷相 变基性岩脉(βνRF) 弱变形的辉长(绿)岩脉 746±6 Ma;630±4 Ma & 200~230 Ma &
      变双峰式火山岩(bvRF) 浅色的钠长浅粒岩-白云钠长片麻岩夹深色(含榴)斜长角闪片岩 780 Ma & ;750 Ma & ;720 Ma & 210~220 Ma &
      变陆源碎屑岩(smRF) 半石墨片岩、(石墨)白云母片岩、(含石墨)白云石英片岩、榴云片岩、夹变粒岩 2 339~690 Ma之间,峰值区间:1 776~ 1 433 Ma、814~690 Ma /
      弧-弧后盆地相 大理岩(caABA) 方解石大理岩 / /
      石英质变质岩(qzABA) 白云石英片岩、厚层状石英岩、夹浅粒岩 3 528~1 139 Ma,峰值区间:2.6~ 2.45 Ga、2.1~1.82 Ga和1.2~1.1 Ga /
      硅泥质变质岩(siABA) 白云母片岩、榴云片岩夹条带状的石英岩薄层 3 335~1 994 Ma*;峰值位于2.54 Ga和2.0 Ga /
      变基性岩(βABA) (含榴)斜长角闪片岩、斜长角闪片岩、绿泥绿帘钠长片岩、绿泥阳起片岩,绿帘透闪片岩 1 102±2 Ma 1 132±12 Ma* 1 105±13 Ma* /
      变超基性岩(ΣABA) 变橄榄岩、变辉石岩、蛇纹石片岩、含榴斜长角闪岩、含榴黝帘阳起石片岩等 1 107±10 Ma*(?) /
      注:年龄值中,标*年龄值来自湖北省地质调查院(2018);标#年龄来自Zhou et al. (2015);标@年龄来自Cheng et al. (2010);标 & 年龄为作者未发表数据;没有任何标记的年龄为本文数据.
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