Age of Flysch in Bangong-Nujiang Ocean: Constraints of Detrital Zircon from Yaduo Village of Gerze County
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摘要: 木嘎岗日岩群是班公湖−怒江洋的洋盆沉积记录，它的时代归属对约束班公湖−怒江洋的演化具有重要意义.然而自命名以来，木嘎岗日岩群的时代一直争议较大.以班公湖−怒江缝合带中段改则县亚多村一带的木嘎岗日岩群为研究对象，对其进行岩石学和碎屑锆石年代学方面的研究.该区木嘎岗日岩群以薄层砂岩和页岩互层为主，具复理石沉积特征.砂岩碎屑锆石年代学分析结果显示，最小碎屑锆石为149 Ma，最小年龄峰值为156 Ma，指示该地区木嘎岗日岩群的时代为晚侏罗世−早白垩世.在此基础上，对班公湖−怒江缝合带中西段内不同地区木嘎岗日岩群的年龄信息进行搜集和整理，结果显示，木嘎岗日岩群的时代跨度至少为晚三叠世−早白垩世，表明班公湖−怒江洋中西段在晚三叠世−早白垩世内可能是连续演化的.Abstract: The Mugagangri Group is an oceanic basin sedimentary record of Bangong-Nujiang Ocean. However, the age of Mugagangri Group has been controversial since it was named. In this paper, the Mugagangri Group in Yaduo Village of Gerze County, central part of Bangong-Nujiang suture zone, is selected as the research object. We have carried out detailed petrological and clastic zircons chronology studies on it. Our research shows the Mugagangri Group in this area is mainly composed of thin sandstone and shale interbeds, which have characteristic of flysch. The chronological analysis of sandstone clastic zircons shows that the minimum clastic zircon is 149 Ma and the minimum age peak is 156 Ma, indicating that the age of the Mugagangri Group in this area is from Late Jurassic to Early Cretaceous. In addition, the age information of Mugagangri Group in different areas of the central and western parts of the Bangong-Nujiang suture zone are collected and analyzed in detail as well. The results show that the age span of the Mugagangri Group is at least Late Triassic-Early Cretaceous, suggesting that the middle and western parts of the Bangong-Nujiang Ocean may have evolved continuously during the Late Triassic-Early Cretaceous.
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Key words:
- Qinghai-Tibet Plateau /
- Mugagangri Group /
- Bangong-Nujiang suture zone /
- detrital zircon /
- geochronology
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图 1 藏北改则地区地质简图
修改自曾庆高等（2010）；1.下−中侏罗统色哇组；2.中侏罗统莎巧木组；3.中侏罗统捷布曲组；4.上三叠统巫嘎组；5.侏罗系木嘎岗日群；6.上侏罗统−下白垩统沙木罗组；7.洞错蛇绿岩岩片；8.仲岗洋岛残片；9.下白垩统去申拉组；10.上石炭统拉嘎组；11.中二叠统下拉组；12.下白垩统郎山组；13.第四系；14.拉果错蛇绿岩岩片；15.晚白垩世花岗岩；16.走滑断层；17.逆冲断层；18.不整合接触界线；19.前人采样位置及碎屑锆石最小年龄；20.本文采样位置及碎屑锆石最小年龄
Fig. 1. Geological map of the Gerze, northern Tibet
图 2 改则县木嘎岗日岩群野外与镜下照片
a.砂页岩互层；b.鲍玛序列中的b和c；c.粒序层理；d.岩屑长石杂砂岩中平行层理；e.复理石中的逆断层；f.复理石中的背斜构造；g、h岩屑杂砂岩镜下特征(+). Q.石英；Mu.白云母；Lv.火山岩屑；Ls.沉积岩屑
Fig. 2. Photograph and micrograph of the Mugagangri Group in Gerze County
图 3 木嘎岗日岩群岩屑杂砂岩典型碎屑锆石阴极发光图像（a）与碎屑锆石U-Pb年龄谐和图(b)
Fig. 3. Cathodoluminescence (CL) dqkx-44-7-2426s of representative zircon grains (a) and concordia plots (b) of lithic graywacke from Mugagangri Group
图 4 岩屑杂砂岩样品碎屑锆石Th/U比值与年龄对应关系图（a）与稀土元素配分曲线（b）
Fig. 4. Th/U ratio with age (a) and chondrite normalized REE patterns (b) of detrital zircon in lithic graywacke
图 5 本文样品与冈底斯板块、羌南−保山板块及其中生代弧岩浆作用、羌塘中部的变质记录、羌北−昌都板块及其中生代弧岩浆作用以及木嘎岗日岩群碎屑锆石数据年龄谱系对比
冈底斯板块据Leier et al.（2007）、Zhu et al.（2011）、Cai et al.（2016）；羌南−保山板块据Pullen et al.(2008, 2011)、Dong et al.（2011）、Gehrels et al.（2011），其中生代弧岩浆作用据Guynn et al.（2006）、Li et al.（2014）、Liu et al.（2017）；羌塘中部的变质记录据Pullen et al.（2008）；羌北−昌都板块据Gehrels et al.（2011），其中生代弧岩浆作用据翟庆国和李才（2007）、王剑等（2007）、李才等（2007）、Zhai et al.（2013）、Peng et al.（2015）；木嘎岗日岩群据Fan et al.（2015a）、Huang et al.（2016）、Li et al.（2017）
Fig. 5. Pre-Cenozoic detrital zircon age distributions of the Gangdise block, the southern Qiangtang block, the southern Qiangtang magmatic arc (SQB arc), the central Qiangtang metamorphic belt (QMB), the northern Qiangtang block, the northern Qiangtang magmatic arc (NQB arc) and previous research of Mugagangri Group, comparing with the age distributions of the studied strata
图 6 班公湖−怒江构造混杂岩带中西段年龄信息分布（a）与各地区木嘎岗日岩群时代分布柱状图（b）
蛇绿岩时代黄强太等（2015）、武勇等（2018）及其参考文献；羌南−保山板块中生代弧岩浆作用引自Li et al. (2014)、Hao et al. (2016)；木嘎岗日岩群年代学资料出处见正文
Fig. 6. The age information distribution of the central and western sections of Bangonghu-Nujiang tectonic melange belt (a) and the age distribution histograms of the Mugagangri Group in various areas (b)
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