Age and tectonic setting of the Yanbian Group in the southwestern Yangtze Block: Constraints from clastic sedimentary rocks
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摘要:
出露于扬子地块西南缘的盐边群为一套火山-沉积岩系，其深入研究对探讨扬子西缘新元古代构造环境具有重要意义。本文对盐边群中碎屑沉积岩进行了较系统的岩石学、碎屑物质组成和地球化学研究，并从小坪组和乍古组中各选取了1件变质砂岩样品进行锆石U-Pb年龄和Hf同位素分析。变质砂岩主要由棱角状-次棱角状火山岩岩屑、石英和长石矿物碎屑组成。碎屑沉积岩Al2O3/SiO2值为0.12~0.4，K2O/Na2O值范围为0.14~9.45(其中板岩K2O/Na2O值多大于1.0，而变质砂岩中多数样品的K2O/Na2O值小于1.0)。所有样品具有轻-中等程度的轻重稀土元素分异((La/Yb)N=1.6~9.37)，多数样品具有明显的负Eu异常。εNd(t)值范围为-1.77~+5.01。变质砂岩碎屑锆石U-Pb年龄峰值为900~910Ma，同时存在少量太古代-古元古代碎屑锆石。小坪组和乍古组变质砂岩中年轻碎屑锆石206Pb/238U年龄加权平均值分别为888±8Ma和884±14Ma。碎屑物质组成、地球化学和锆石U-Pb年龄结果共同表明，盐边群碎屑沉积为近源沉积，物源区主要为岛弧中酸性火山岩和花岗岩。结合关刀山岩体(857Ma)和荒田组玄武岩(880~830Ma)研究结果，进一步限定盐边群的时代为880~830Ma，形成于弧后盆地环境，其沉积物源区为华夏地块向扬子地块俯冲过程中，扬子西南缘形成的火山岛弧。
Abstract:The southwestern margin of the Yangtze Block is occupied by the thick volcanic-sedimentary rocks of the Yanbian Group, which is of significance in reconstructing the Neoproterozoic tectonic environment of this region. The clastic sedimentary rocks of the Yanbian Group have been studied on petrology, clastic composition and geochemistry. In addition, two sandstone samples are collected from the Xiaoping Formation and Zhagu Formation, respectively, for zircon U-Pb dating and Hf isotope analysis. In the metasandstone of the Yanbian Group many volcanic lithoclasts and mineral debris of quartz and feldspar have been discerned, which show poor sorting and roundness. In the clastic sedimentary rocks, Al2O3/SiO2 is ranging from 0.12 to 0.4, and K2O/Na2O from 0.14 to 9.45, in which most slates with K2O/Na2O ratio over 1.0, while most sandstones less than 1.0. The LREEs and HREEs in the clastic sedimentary rocks are slightly to moderately differentiated with (La/Yb)N ratios from 1.6 to 9.37 and most with substantial negative Eu anomaly. The εNd(t) gives the range of -1.77 to +5.01. The detrital zircons U-Pb result is mainly concentrated at 900Ma to 910Ma with minor ages of Archean to Paleoproterozoic. The weighted mean ages of the young detrital zircons of the Xiaoping and Zhagu formations are 888±8Ma and 884±14Ma, respectively. The clastic composition, geochemistry and zircon U-Pb ages all indicate that clastic sediments in the Yanbian Group are proximal deposits, and the sedimentary provenances are from intermediate-felsic volcanic rocks and granites in island arc environment. Combining with the results of the Guandaoshan diorite and the basalt in the Huangtian Fm., the age of the Yanbian Group is constrained to 880~830Ma, deposited in the back-arc basin environment. Provenance of the clastic sediments is from the volcanic arc at the western margin of the Yangtze Block when the Cathaysian Block was being subducted beneath the Yangtze Block.
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Key words:
- Yangtze Block /
- Yanbian Group /
- Clastic sedimentary rocks /
- Geochemistry /
- Back-arc basin
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图 4
盐边群碎屑沉积岩显微照片
Figure 4.
Microscopic photos of clastic sedimentary rocks in Yanbian Group
图 5
盐边群碎屑沉积岩主量元素与SiO2相关图
Figure 5.
Plots of SiO2 vs. TiO2, Al2O3, Fe2O3 T and MgO for clastic sedimentary rocks in Yanbian Gorup
图 6
盐边群碎屑沉积岩分类图
Figure 6.
Classification on clastic sedimentary rocks of Yanbian Group
图 7
盐边群碎屑沉积岩稀土元素配分图解
Figure 7.
Chondrite normalized REE patterns for clastic sedimentary rocks in Yanbian Group
图 8
盐边群砂岩锆石阴极发光图像
Figure 8.
CL images of zircons from sandstones of Xiaoping Fm. and Zhagu Fm. in Yanbian Group
图 9
盐边群小坪组砂岩锆石U-Pb年龄谐和图与直方图
Figure 9.
SHRIMP U-Pb concordia diagrams and histograms for zircons from sandstones of Xiaoping Fm. in Yanbian Group
图 10
盐边群乍古组砂岩锆石U-Pb年龄谐和图与直方图
Figure 10.
SHRIMP U-Pb concordia diagrams and histograms for zirons from sandstones of Zhagu Fm. in Yanbian Group
图 11
盐边群碎屑沉积岩Al2O3-(Na2O+CaO*)-K2O图
Figure 11.
Ternary plots of molecular proportions Al2O3-(Na2O+CaO*)-K2O for clastic sedimentary rocks in Yanbian Group
图 12
盐边群碎屑沉积岩Th/U-CIA相关图
Figure 12.
Plots of Th/U vs. CIA for clastic sedimentary rocks in Yanbian Group
图 13
盐边群碎屑沉积岩Th/U-Th相关图
Figure 13.
Plots of Th/U vs. Th for clastic sedimentary rocks in Yanbian Group
图 14
盐边群碎屑沉积岩Th/Sc-Zr/Sc相关图
Figure 14.
Plots of Th/Sc vs. Zr/Sc for clastic sedimentary rocks in Yanibian Group
图 15
盐边群碎屑沉积岩Al-Ti-Zr图解
Figure 15.
Al-Ti-Zr triangular diagram for clastic sedimentary rocks in Yanibian Group
图 16
盐边群碎屑沉积岩源区判别图
Figure 16.
Discrimination diagrams for the provenance signature of clastic sedimentary rocks in Yanbian Group
图 17
盐边群碎屑沉积岩La/Th-Hf相关图
Figure 17.
La/Th-Hf source rock discrimination diagrams for clastic sedimentary rocks in Yanibian Group
图 18
盐边群碎屑沉积岩Co/Th-La/Sc相关图
Figure 18.
Co/Th vs. La/Sc source rock discrimination diagrams for clastic sedimentary rocks in Yanbian Group
图 19
盐边群碎屑沉积岩εNd(t)-Th/Sc关系图
Figure 19.
Plots of εNd(t) vs. Th/Sc for clastic sedimentary rocks in Yanbian Group
图 20
盐边群碎屑沉积岩主量元素构造环境判别图
Figure 20.
Major elements discrimination diagrams for clastic sedimentary rocks in Yanbian Group
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