Detrital Zircon U-Pb Geochronological Records and Its Response of Provenance Transformation of Strata Surrounding Cambrian-Devonian Unconformity in Eastern Margin of Yunkai Massif
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摘要: 云开地块东缘粤西圭岗镇附近寒武系之上不整合覆盖一套灰白色石英砾岩-含砾砂岩，由于缺乏化石和年龄依据，这套岩石的时代长期存有争议.利用LA-ICP-MS U-Pb测年手段，对该套含砾碎屑沉积岩及其上下层位进行了U-Pb测年，4件样品共获得300组有效数据，年龄变化于2 900~400 Ma，不整合面之下样品主要集中于1 100~700 Ma，不整合面之上最年轻碎屑锆石年龄集中于450~400 Ma.新的测年数据结合前人研究成果表明，云开地块东缘不整合面下伏及上覆地层的时代分别为寒武纪和泥盆纪.研究区寒武纪时期物源特征与印度、东南极洲和澳大利亚西部相似，指示该时期研究区同冈瓦纳东北缘相连，物源来自东冈瓦纳北缘南极洲、印度地块和澳大利亚之间的造山带，而泥盆纪物源主要来自邻近的云开地块.寒武系和泥盆系之间的不整合面是早古生代郁南运动与广西运动叠加的产物.Abstract: The unconformity of the Cambrian in the eastern margin of the Yunkai massif near Guigang, West Guangdong covers a set of gray-white quartz conglomerate-gravel sandstones. Due to the lack of fossils and U-Pb dating, the age of the stratum has remained controversial for a long time. By LA-ICP-MS U-Pb dating, a total of 300 valid data were obtained from 4 samples with age ranging from 2 900-400 Ma in this study. The samples below the unconformity surface are mainly concentrated at 1 100-700 Ma, and the youngest detrital zircon ages above the unconformity surface are concentrated at 450-400 Ma. The new dating data combined with previous research show that the ages of underlying and overlying strata in Guigang are Cambrian and Devonian, respectively. The source characteristics of the Cambrian are similar to those of the orogenic zone among India, eastern Antarctica and Australia. While the Devonian sources are relatively homogeneous, derived from the adjoining Yunkai massif. It is proposed that the unconformity of the study area should have resulted from the superposition of the Yu'nan orogeny and the Guangxi orogeny.
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Key words:
- Yunkai massif /
- detrital zircon /
- Yu'nan orogeny /
- Guangxi orogeny /
- geochronology /
- sedimentology
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图 1 华南(a)及粤西圭岗镇(b)地质简图与采样位置
图a据Wang et al.(2013a)修改
Fig. 1. Simplified geological map of South China and Guigang, West Guangdong showing the sampling locations
图 3 研究区寒武系-泥盆系地层柱状图及样品镜下显微照片
1.砂岩；2.石英砂岩；3.岩屑石英砂岩；4.砾岩；5.泥质砂岩；6.长石砂岩；7.变质砂岩；8.变质长石石英砂岩；9.炭质千枚岩；L.岩屑；Q.石英；Ser.绢云母
Fig. 3. Stratigraphic column of the Cambrian to Devonian strata and microphotographs of each sample in the studied section in Guigang, West Guangdong
图 4 广东圭岗镇寒武系(PM6-72, PM6-186)和上覆争议地层(PM6-187, MN-6)碎屑锆石阴极发光图像及分析点表面年龄
Fig. 4. Cathodoluminescence images with analytical spots and corresponding apparent ages of detrital zircons from the Cambrian and overlying disputed strata in Guigang, West Guangdong
图 5 圭岗剖面寒武系和泥盆系LA-ICP-MS碎屑锆石U-Pb谐和曲线
“n=70/80”表示一致年龄和总测试数量之比，一致性区间为90%~110%，年龄显示为1σ不确定性
Fig. 5. LA-ICP-MS zircon U-Pb concordia age plots of Cambrian and Devonian samples from the Guigang Section
图 6 圭岗镇寒武系和泥盆系样品碎屑锆石年龄直方图
Fig. 6. Age histograms of zircons of rocks from the Cambrian and Devonian strata in Guigang, West Guangdong
图 7 研究区及相邻地体碎屑锆石U-Pb年龄谱对比
图c~d数据来自文献Xu et al.(2014)；图e~f数据来自李献华等(2012)；图g年龄数据来自文献Goodge et al.(2004)；图h~i年龄数据来自文献Xu et al.(2013)
Fig. 7. Compilation of detrital zircon distributions from Guigang, West Guangdong (this study) and other areas around the world
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