Rock association of Sanggan Group from Huai'an region, Hebei Province, and constraints of zircon U−Pb geochronology on their formation and metamorphic ages
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摘要:
研究目的 河北怀安地区大面积出露前寒武纪变质基底，以往研究为怀安地区变质岩的系划分建立了不同方案，然而这些变质岩系的形成和变质时代尚存在争议。
研究方法 通过河北怀安地区1∶5万区域地质调查，依据岩石组合重新厘定和划分了怀安杂岩带中桑干岩群的马市口岩组和右所堡岩组，选取其中的麻粒岩和片麻岩开展锆石U−Pb年代学研究。
研究结果 马市口岩组以麻粒岩类为主，普遍见紫苏辉石和普通辉石，岩体总体呈明显的灰黄色调，局部见磁铁石英岩夹层。右所堡岩组中斜长角闪岩夹层较马市口岩组显著增多，普遍含有黑云母和角闪石，局部见少量大理岩夹层，颜色总体呈灰色调。根据岩石组合特征和原岩恢复分析，怀安地区的桑干岩群原岩建造以基性火山岩为主、少量中酸性火山岩夹含泥质碎屑沉积岩、铁硅质沉积岩及碳酸盐岩沉积岩，属沉积－火山岩建造类型。不同变质程度麻粒岩和片麻岩中锆石U−Pb定年结果显示，存在2.6～2.2 Ga和2.0～1.7 Ga两个年龄峰值。
结论 岩石组合及锆石U−Pb年龄峰值分布特征共同指示怀安地区桑干岩群原岩形成于新太古代晚期（约2.5 Ga），并在古元古代晚期（约1.8 Ga）遭受了角闪岩相-麻粒岩相变质作用。
Abstract:Objective The Precambrian metamorphic basement is widely exposed in the Huai'an area of Hebei Province. Previous studies have proposed different schemes for the stratigraphic division of metamorphic rocks in the Huai'an area. However, the formation and metamorphic ages of these metamorphic rocks remain controversial.
Methods Through the 1:50,000 regional geological survey in Huai'an area, Hebei Province, the Mashikou Formation and Yousuopu Formation of the Sanggan Group in the Huai'an Complex Belt have been redefined and subdivided based on rock association. The zircon U−Pb age dating of granulites and gneiss of the Sanggan Group was carried out based on in−situ LA−ICP−MS analysis.
Results The Mashikou Formation is mainly composed of granulites, with occurrences of hypersthene and augite. The rock mass of Mashikou Formation is overall grayish yellow in color, with locally interlayers of magnetite quartzite. Compared to the Mashikou Formation, there is a significant increase in layers of plagioclase amphibolite in the Yousuopu Formation, containing higher proportions of biotite and hornblende, locally interbedded with a small amount of grayish−colored marble veins. Accroding to characteristics of rock association and protolith reconstruction, the protolith of Sanggan Group is mainly composed of ultra−basic and basic volcanic rocks, with a small amount of intermediate acidic volcanic rocks interbedded with muddy clastic, ferro−siliceous, and carbonate sedimentary rocks. It belongs to volcano−sedimentary series which were formed at extensional and passive continental margin basins. The zircon U−Pb dating of granulites and gneiss from Sanggan Group show two age peaks between 2.6～2.2 Ga and 2.0～1.7 Ga.
Conclusions The rock association and zircon U−Pb age distribution peaks collectively indicate that the protoliths of Sanggan Group in the Huai'an area were formed in the late Neoarchean (～2.5 Ga) and underwent amphibolite−facies to granulite−facies metamorphism in the Late Paleoproterozoic (～1.8 Ga).
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Key words:
- Sanggan Group /
- rock association /
- zircon U−Pb dating /
- LA−ICP−MS /
- Huai’an area, Hebei
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表 1 怀安地区右所堡组岩性特征、厚度变化对比
Table 1. Rock association of Yousuopu Formation at Huai’an area
地理位置 岩性特征及厚度变化 水闸屯幅北东水濠
洼村一带下部为灰黑色、灰黄色（含黑云）二辉角闪斜长变粒岩、矽线黑云斜长片麻岩夹含石榴黑云角闪斜长变粒岩；上部为灰黄色（含石榴）二辉斜长片麻岩、辉石角闪斜长变粒岩、石榴二辉斜长麻粒岩夹肉红色二长浅粒岩及灰白色大理岩。厚度247.7 m 水闸屯幅向阳村—
龙王塘村一带下部灰白色、灰黄色（石榴）二辉斜长片麻岩或变粒岩、含石榴角闪二辉斜长麻粒岩夹灰黑色石榴斜长角闪岩；中部浅灰色、灰白色二辉斜长麻粒岩、黑云二辉斜长变粒岩夹石榴斜长变粒岩及黑云辉石斜长变粒岩；上部灰黑、灰黄色黑云二辉斜长片麻岩、黑云紫苏斜长片麻岩夹角闪斜长二辉麻粒岩、含石榴斜长角闪变粒岩。厚度1568.9 m 水闸屯幅青水山—
罗家庙一带下部灰色、灰白色、灰黑色（含黑云）二辉斜长片麻岩或变粒岩、灰白色—浅肉红色二长浅粒岩为主，夹灰黑色斜长角闪岩、黑云角闪斜长片麻岩；中部灰黄色、灰黑色（含黑云）二辉斜长片麻岩、含石榴黑云二辉斜长片麻岩夹斜长角闪岩及浅肉红色二长浅粒岩；上部灰色、灰白色、灰黑色（含黑云）二辉斜长变粒岩、含黑云二辉斜长麻粒岩、（含黑云）二辉斜长片麻岩偶斜长角闪岩。厚度2050.8 m 水闸屯幅南新庄村北 为右所堡岩组底部层位，岩性灰黑色、灰黄色（含石榴）二辉斜长变粒岩、黑云角闪斜长片麻岩与斜长角闪岩、角闪二辉石岩互层，夹含角闪二辉斜长麻粒岩。厚度99.2 m 水闸屯幅富民沟村—
阮家窑村一带以二辉（角闪）斜长片麻岩、含黑云紫苏斜长变粒岩、二辉斜长麻粒岩或变粒岩等为主体，夹二长浅粒岩及斜长角闪岩。厚度171.8 m 怀安县幅东部柳沟村—
前水关一带浅灰色、灰黑色二辉斜长片麻岩、含紫苏黑云斜长变粒岩、含紫苏角闪黑云斜长片麻岩夹斜长角闪岩；中部灰黄色、灰黑色含紫苏黑云斜长变粒岩或片麻岩、二辉斜长片麻岩夹紫苏斜长麻粒岩、斜长角闪岩；上部灰黄色或紫苏黑云斜长变粒岩、黑云角闪斜长变粒岩、黑云角闪斜长片麻岩夹或石榴二辉斜长麻粒岩。厚度1050.2 m 鹿尾沟幅南西尚义县
碌沟村灰黄色石榴黑云斜长变粒岩、灰黑色二辉斜长变粒岩、浅黄色、灰色含石榴含紫苏黑云斜长片麻岩、灰黄色紫苏黑云斜长片麻岩，石榴子石含量较多。厚度353.8 m 
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表 2 桑干岩群典型岩石锆石U−Th−Pb同位素组成和年龄结果
Table 2. U−Th−Pb isotope and dating results for zircons of representative Sanggan Group rocks
测点号 含量/10－6 Th/U 同位素比值 年龄/Ma 谐和度 Th U 207Pb/ 206Pb 1σ 207Pb/ 235U 1σ 206Pb/ 238U 1σ 207Pb/ 206Pb 1σ 207Pb/ 235U 1σ 206Pb/ 238U 1σ RZ112-17-2（二辉斜长麻粒岩） 1 43 49 0.62 0.155 0.004 10.7 0.3 0.497 0.006 2406 45 2496 26 2600 27 95% 2 16 34 0.32 0.136 0.005 7.4 0.26 0.394 0.007 2180 63 2158 32 2143 30 99% 6 39 96 0.16 0.16 0.004 10.8 0.29 0.489 0.009 2453 37 2510 25 2568 41 97% 7 4 145 0.02 0.167 0.004 12.1 0.29 0.521 0.008 2532 37 2614 23 2704 32 96% 8 17 34 0.36 0.164 0.005 11.6 0.35 0.511 0.009 2495 44 2569 28 2662 37 96% 9 31 174 0.12 0.17 0.004 12.5 0.37 0.522 0.009 2561 40 2640 28 2708 37 97% 10 44 92 0.34 0.115 0.003 5.6 0.15 0.352 0.005 1873 47 1912 23 1942 26 98% 11 67 95 0.5 0.153 0.004 9.4 0.23 0.444 0.007 2381 41 2376 23 2368 29 99% 13 10 32 0.12 0.14 0.01 6.8 0.38 0.378 0.014 2228 123 2081 49 2066 63 99% 15 52 103 0.39 0.143 0.004 8.5 0.31 0.43 0.008 2258 49 2290 33 2306 34 99% 17 19 37 0.38 0.143 0.005 8.5 0.33 0.437 0.009 2261 63 2288 36 2336 40 97% 20 8 32 0.16 0.131 0.006 6.7 0.27 0.38 0.007 2110 76 2073 36 2075 34 99% 21 19 65 0.22 0.134 0.004 6.9 0.22 0.376 0.006 2148 53 2099 28 2057 26 97% 22 2 52 0.02 0.163 0.005 11.3 0.44 0.502 0.012 2484 48 2552 36 2620 50 97% 23 57 112 0.35 0.124 0.004 6.3 0.21 0.367 0.005 2021 52 2024 29 2017 25 99% 24 98 182 0.41 0.165 0.004 12 0.3 0.527 0.007 2511 39 2605 23 2729 29 95% 25 42 78 0.41 0.152 0.005 9.9 0.31 0.476 0.008 2372 50 2428 28 2508 36 96% 26 36 71 0.37 0.164 0.005 10.4 0.31 0.463 0.007 2498 46 2475 27 2452 32 99% 27 27 51 0.42 0.153 0.005 10 0.37 0.474 0.009 2377 54 2435 34 2501 38 97% 28 14 28 0.4 0.152 0.007 9.5 0.38 0.471 0.011 2369 72 2388 37 2488 48 95% 29 6 14 0.3 0.134 0.008 6.2 0.41 0.349 0.011 2154 107 2010 58 1928 50 95% 30 28 49 0.39 0.133 0.009 6.5 0.44 0.354 0.009 2143 108 2042 60 1956 42 95% TW5815-0-1（斜长辉石角闪岩） 1 16 86 0.12 0.11 0.005 5.16 0.21 0.346 0.004 1794 73 1846 355 1917 20 96% 2 36 1377 0.18 0.107 0.003 5.05 0.15 0.347 0.004 1744 566 1828 25 1918 199 95% 3 9 24 0.21 0.116 0.013 5.11 0.57 0.344 0.009 1900 203 1838 955 1906 45 96% 4 18 26 0.46 0.122 0.013 5.15 0.5 0.343 0.008 1984 189 1845 83 1902 37 96% 5 157 462 0.25 0.118 0.002 5.51 0.11 0.338 0.003 1931 33 1902 16 1877 14 98% 6 15 38 0.25 0.119 0.009 5.63 0.4 0.364 0.007 1948 135 1920 61 1999 35 95% 7 24 27 0.62 0.13 0.012 5.91 0.57 0.351 0.009 2102 167 1963 84 1939 43 98% 9 16 29 0.35 0.12 0.012 5.34 0.49 0.345 0.009 1958 181 1875 78 1910 41 98% 10 16 31 0.33 0.129 0.009 5.91 0.43 0.342 0.007 2089 125 1963 63 1895 35 96% 11 16 30 0.37 0.121 0.01 5.63 0.46 0.354 0.007 1969 153 1920 70 1951 34 98% 12 19 35 0.36 0.134 0.012 5.63 0.44 0.329 0.008 2144 152 1921 68 1833 37 95% 13 12 57 0.14 0.118 0.007 5.42 0.3 0.344 0.006 1928 106 1888 47 1905 28 99% 14 285 144 1.35 0.111 0.004 5.17 0.16 0.342 0.004 1807 60 1847 27 1897 20 97% 15 104 79 0.93 0.106 0.005 4.74 0.23 0.331 0.005 1731 91 1774 41 1845 24 96% 16 233 293 0.57 0.159 0.003 10.2 0.2 0.464 0.004 2450 33 2452 18 2458 17 99% RZ109-3-1（二辉斜长麻粒岩） 1 33 10 2.62 0.152 0.014 6.30 0.55 0.344 0.016 2365 151 2019 77 1907 77 94% 2 943 26 2.99 0.114 0.006 5.41 0.28 0.353 0.008 1861 96 1887 45 1948 40 96% 3 45 8.6 3.91 0.153 0.011 7.08 0.44 0.360 0.013 2380 117 2121 55 1981 63 93% 4 13 10 0.97 0.137 0.01 6.52 0.59 0.372 0.024 2194 122 2048 80 2039 111 99% 6 282 261 0.81 0.158 0.004 9.91 0.26 0.448 0.006 2439 41 2427 24 2388 26 98% 9 11 48 0.05 0.127 0.006 6.86 0.35 0.389 0.011 2057 81 2094 46 2119 51 98% 10 64 52 1.03 0.147 0.006 8.07 0.35 0.395 0.009 2317 67 2239 39 2146 44 95% 11 8.9 5.9 1.18 0.167 0.014 7.91 0.6 0.389 0.017 2524 146 2221 68 2116 77 95% 12 49 13 3.12 0.139 0.01 6.27 0.35 0.361 0.012 2218 119 2015 50 1988 58 98% 13 62 24 2.17 0.123 0.008 5.9 0.36 0.361 0.01 2067 103 1961 53 1988 46 98% 14 69 60 0.96 0.111 0.005 5.2 0.19 0.342 0.005 1833 77 1853 32 1898 25 97% 15 17 13 1.04 0.126 0.01 5.87 0.42 0.366 0.012 2056 136 1957 62 2012 56 97% 18 51 13 3.24 0.119 0.01 5.38 0.38 0.358 0.012 1944 143 1882 61 1974 55 95% 20 13 7.8 1.28 0.176 0.018 12.7 1.62 0.531 0.059 2617 174 2656 121 2745 247 96% 21 83 151 0.4 0.16 0.004 11.4 0.28 0.514 0.007 2455 39 2555 23 2674 30 95% 22 7.3 113 0.05 0.117 0.004 5.17 0.18 0.318 0.005 1917 57 1848 29 1778 22 96% 23 122 178 0.63 0.16 0.004 10.7 0.29 0.488 0.008 2450 44 2499 25 2560 33 97% 24 13 7.1 1.47 0.163 0.014 7.44 0.63 0.379 0.016 2487 149 2166 76 2072 76 95% 25 195 272 0.57 0.162 0.004 11 0.29 0.489 0.007 2481 40 2522 24 2565 32 98% 26 97 149 0.58 0.152 0.005 9.65 0.34 0.45 0.008 2373 56 2402 32 2395 36 99% RZ7723-0-1（石榴角闪斜长二辉麻粒岩） 1 35 54 0.51 0.114 0.004 5.25 0.195 0.334 0.006 1870 63 1860 32 1858 26 99% 2 47 57 0.63 0.109 0.004 4.9 0.164 0.329 0.006 1776 61 1802 28 1833 27 98% 3 12 23 0.39 0.111 0.005 5.25 0.273 0.345 0.008 1817 85 1860 44 1910 39 97% 4 10 163 0.04 0.112 0.003 5.22 0.13 0.336 0.004 1835 43 1856 21 1867 20 99% 5 10 23 0.33 0.124 0.006 6.08 0.328 0.358 0.008 2015 93 1987 47 1974 38 99% 6 12 29 0.31 0.122 0.006 5.96 0.327 0.359 0.009 1981 83 1970 48 1979 42 99% 7 29 48 0.46 0.117 0.005 5.49 0.221 0.342 0.006 1916 72 1900 35 1897 27 99% 8 21 36 0.47 0.121 0.005 5.85 0.227 0.357 0.007 1972 75 1954 34 1969 32 99% 9 28 43 0.53 0.123 0.005 6.01 0.233 0.36 0.007 1994 70 1977 34 1980 32 99% 10 17 33 0.39 0.116 0.005 5.84 0.269 0.366 0.008 1894 78 1953 40 2010 36 97% 11 9 54 0.13 0.12 0.006 6.29 0.489 0.366 0.011 1955 84 2017 68 2011 52 99% 12 18 34 0.41 0.112 0.005 5.44 0.256 0.359 0.008 1828 82 1892 40 1976 38 95% 13 15 52 0.22 0.117 0.006 5.53 0.257 0.347 0.008 1913 85 1906 40 1920 36 99% 14 20 40 0.38 0.118 0.005 6 0.215 0.375 0.006 1920 69 1976 31 2052 27 96% 15 1 12 0.04 0.131 0.008 6.82 0.411 0.404 0.013 2110 101 2088 53 2188 59 95% 17 10 80 0.08 0.115 0.004 5.79 0.19 0.363 0.005 1881 59 1945 28 1998 25 97% 18 12 105 0.08 0.113 0.004 5.59 0.175 0.358 0.006 1848 55 1914 27 1972 28 97% 20 4 101 0.03 0.115 0.004 6.05 0.218 0.381 0.008 1883 57 1984 31 2080 38 95% 22 14 73 0.16 0.11 0.004 5.45 0.224 0.359 0.006 1811 70 1893 35 1975 29 95% 23 12 132 0.07 0.111 0.004 5.23 0.204 0.34 0.008 1818 71 1857 33 1889 37 98% 24 14 104 0.11 0.129 0.005 6.11 0.216 0.342 0.005 2080 61 1992 31 1898 24 95% 25 12 46 0.22 0.114 0.007 5.72 0.442 0.356 0.011 1933 117 1934 67 1962 54 98% 26 18 30 0.46 0.118 0.009 5.68 0.43 0.36 0.011 1920 137 1929 65 1984 51 97% 27 23 47 0.37 0.135 0.011 7.59 1.247 0.406 0.028 2162 143 2184 148 2198 126 99% 28 16 95 0.13 0.116 0.003 5.66 0.168 0.353 0.005 1892 52 1926 26 1947 23 98% 29 20 100 0.15 0.115 0.003 5.72 0.177 0.358 0.005 1883 56 1935 27 1973 24 98% RZ111-5-1（绿泥石化角闪斜长片麻岩） 1 27 280 0.08 0.109 0.003 4.94 0.124 0.327 0.004 1777 44 1809 21 1825 18 99% 2 24 61 0.29 0.106 0.004 4.75 0.169 0.329 0.005 1727 69 1776 30 1831 26 96% 3 20 1177 0.13 0.112 0.003 5.03 0.14 0.326 0.005 1829 51 1825 23 1817 23 99% 4 50 35 1.09 0.117 0.005 5.14 0.21 0.321 0.007 1916 73 1843 35 1793 34 97% 5 123 524 0.18 0.155 0.003 9.39 0.206 0.434 0.005 2406 35 2376 20 2322 22 97% 6 38 113 0.28 0.109 0.004 5.13 0.193 0.341 0.006 1791 69 1841 32 1891 31 97% 7 20 33 0.52 0.117 0.006 5.29 0.252 0.333 0.008 1918 118 1867 41 1851 39 99% 8 57 126 0.36 0.137 0.004 8.21 0.232 0.43 0.006 2190 47 2254 26 2306 26 97% 9 36 495 0.05 0.141 0.004 7.89 0.201 0.401 0.006 2256 43 2219 23 2174 25 97% 10 8 17 0.37 0.162 0.012 7.73 0.521 0.394 0.016 2481 129 2200 61 2142 73 97% 11 21 32 0.52 0.113 0.005 5.17 0.221 0.333 0.007 1850 76 1848 36 1853 33 99% 12 32 97 0.15 0.112 0.004 5.36 0.166 0.345 0.004 1839 53 1879 27 1910 21 98% 13 25 30 0.64 0.121 0.006 5.46 0.265 0.334 0.007 1965 87 1895 42 1856 33 97% 14 24 113 0.17 0.107 0.003 4.99 0.163 0.336 0.006 1750 54 1818 28 1865 27 97% 17 35 151 0.15 0.155 0.004 9.81 0.302 0.454 0.008 2406 46 2417 28 2414 37 99% 18 58 152 0.26 0.157 0.004 10 0.269 0.461 0.008 2420 36 2436 25 2442 33 99% 19 11 38 0.21 0.12 0.005 5.48 0.221 0.338 0.007 1958 78 1897 35 1878 33 99% 20 19 52 0.25 0.111 0.005 5.43 0.231 0.356 0.006 1817 74 1889 37 1962 29 96% 21 155 94 1.25 0.163 0.004 10.3 0.304 0.455 0.007 2487 46 2462 27 2419 30 98% 22 170 91 1.36 0.159 0.005 10.4 0.316 0.473 0.008 2447 50 2467 28 2495 35 98% 23 54 143 0.3 0.158 0.004 10.5 0.297 0.48 0.007 2431 45 2477 26 2526 31 98% 24 4 101 0.02 0.121 0.004 6.25 0.211 0.373 0.006 1970 58 2011 29 2044 28 98% 25 77 123 0.46 0.164 0.005 10.9 0.335 0.482 0.008 2496 49 2518 29 2535 34 99% 27 153 511 0.2 0.166 0.004 11.2 0.27 0.486 0.006 2520 39 2542 22 2553 26 99% 29 20 42 0.31 0.135 0.005 7.72 0.308 0.415 0.008 2169 69 2199 36 2239 36 98% 30 12 26 0.26 0.15 0.006 8.99 0.386 0.43 0.01 2350 69 2337 39 2305 46 98% 31 18 39 0.36 0.167 0.007 10.4 0.443 0.458 0.011 2524 69 2471 39 2429 48 98% 32 78 57 1.08 0.109 0.004 5.39 0.219 0.357 0.006 1783 73 1883 35 1970 29 95% 33 34 251 0.08 0.154 0.004 10 0.295 0.466 0.008 2395 44 2439 27 2465 37 98%
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