Tectonic setting and provenance of the Xikang Group in the Guining area, West Sichuan Province: Constraints from geochemistry of clastic sedimentary rocks
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摘要:
川西归宁地区紧邻江浪穹隆和长枪穹隆，大面积出露三叠系西康群，主体表现为一套浅变质的浊积岩复理石建造。对该套地层的碎屑岩进行岩石学、地球化学特征研究，并对物源和其亲缘关系进行了探讨。结果显示，砂岩主量元素SiO2、P2O5与上地壳相近，CaO、MgO较高，而Al2O3、Fe2O3、K2O、TiO2含量偏低；微量元素蛛网图呈"M"型向右缓倾，富Th、U、La、Nd、Zr、Sm，贫K、Nb、Sr、P、Hf元素；样品轻、重稀土元素分馏明显，属轻稀土元素富集型，具中等负Eu异常；化学蚀变指数及成分成熟度均偏低，反映出物源区化学风化程度弱，沉积物具近源快速堆积的特征，是活动构造带的首次沉积；砂岩-泥岩套的物源区指纹判别图解及微量元素值显示该区西康群为上地壳长英质物源区。根据地球化学构造判别图解，并结合野外调查的古水流和古地理重建的证据，该套碎屑岩沉积于活动大陆边缘及大陆岛弧的构造背景，其物源区有可能来自于南东方向邻近的康滇古陆，与扬子地块西缘具有较强的亲缘关系。
Abstract:The Xikang Group, distributed in the Guining area between the Changqiang Dome and Jianglang Dome in West Sichuan Province, is one set of low metamorphosed turbidite flysch.Based on the study of their petrological and geochemical characteristics of the clastic rocks, the provenance and affiliation were analyzed. The results show that the major elements of the sandstone, SiO2 and P2O5, are similar to the upper crust, with relatively high CaO and MgO, while the contents of Al2O3, Fe2O3, K2O and TiO2 are relatively low.The Chondrite-normalized trace element spider diagram of clastic sedimentary rocks is "M"-shaped and inclined to the right, rich in Th, U, La, Nd, Zr, Sm and poor in K, Nb, Sr, P, Hf.The rare earth elements of the samples display obvious fractionation in light and heavy REE, strong enrichment in light REEs with medium negative Eu anomaly.The chemical alteration index (CIA) and composition variation index value (ICV) are both low, reflecting the weak weathering degree of the source area and the characteristics of rapid accumulation of sediments near source, which represents the first deposition of the active structural belt.The fingerprint discrimination diagram and trace element value show that the source of the Xikang Group in this area was felsic in upper crust.According to geochemical tectonic setting discrimination diagrams, the structural background of the clastic rocks is active continental margin and continental island arc.Based on the paleocurrent evidence of field investigation and the reconstruction of paleogeography, it is inferred that the provenance of the Xikang Group might have come from the Kangdian ancient land in the southeast direction, and have an affinity to the Yangtze Block.
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Keywords:
- Xikang Group /
- geochemical characteristics /
- tectonic setting /
- provenance /
- Guining
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致谢: 参加野外工作人员有四川省地矿局川西北地质队罗绍强、赵学森、李江涛等，中国地质科学院矿产综合利用研究所杨合兴、唐德强清绘部分图件，审稿老师和编辑部老师对完善本文提出了诸多建设性意见，在此一并表示感谢。
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图 1 川西归宁地区区域地质略图及采样位置
1—奥陶系-二叠系；2—菠茨沟组；3—扎尕山组；4—杂谷脑组；5—侏倭组；6—新都桥组；7—两河口组；8—印支期花岗岩；9—燕山期花岗岩；10—逆断层；11—正常产状/倒转产状；12—样点位置
Figure 1. Simplified geological map and sampling location of the Guining area, West Sichuan Province
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图版Ⅰ
a.不完整鲍马序列Tab段；b.不完整鲍马序列Tcde段；c.向上变细变薄层序；d.杂谷脑组基本层序；e.正粒序层理；f.槽模构造；g.重荷模构造；h.沟模构造；i.层面及波痕示顶构造；j.变质长石砂岩镜下特征(正交偏光)；1—含砾粗砂岩；2—粗砂岩；3—中砂岩；4—细砂岩；5—粉砂岩；6—板岩；7—正粒序层理；8—波痕构造；9—平行层理；10—水平层理；UF—正粒序；Pl—斜长石；Ser—绢云母；Qtz—石英
图版Ⅰ.
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图 2 归宁地区碎屑岩的log(SiO2/Al2O3)- log(Na2O/K2O)分类图解[39]
Figure 2. Classification diagram of log(SiO2/Al2O3)- log(Na2O/K2O)for clastic sedimentary rocks in the Guining area
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图 3 归宁地区碎屑岩微量元素球粒陨石标准化蛛网图(a)和稀土元素球粒陨石标准化分布型式图(b)
(球粒陨石标准值据参考文献[41])
Figure 3. Chondrite-normalized trace element spider diagrams(a) and chondrite-normalized REE patterns (b) of clastic sedimentary rocks in the Guining area
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图 4 归宁地区碎屑岩Al2O3-(Na2O+CaO)-K2O图解[45]
Sme—绢云母；Kln—高岭石；Gbs—三水铝矿；Chl—绿泥石；Pl—斜长石；Kfs—钾长石
Figure 4. Al2O3-(Na2O+CaO)-K2O diagram of clastic sedimentary rocks in the Guining area
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图 5 归宁地区碎屑岩Th-Th/U图解[47]
Figure 5. Th-Th/U diagram of clastic sedimentary rocks in the Guining area
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图 6 归宁地区碎屑岩源区性质函数判别图解[53]
Figure 6. Provenance discrimination diagram of clastic sedimentary rocks in the Guining area
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图 7 归宁地区碎屑岩Hf-La/Th图解[54]
Figure 7. Hf-La/Th diagram of clastic sedimentary rocks in the Guining area
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图 8 归宁地区碎屑岩主量元素与构造背景关系判别图[57]
A—大洋岛弧；B—大陆岛弧；C—活动大陆边缘；D—被动大陆边缘
Figure 8. Discrimination diagrams of major element compositions for the tectonic setting of the clastic sedimentary rocks in the Guining area
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图 9 归宁地区西康群微量元素与构造背景关系判别图[57]
A—大洋岛弧；B—大陆岛弧；C—活动大陆边缘；D—被动大陆边缘
Figure 9. Discrimination diagrams of trace element for the tectonic setting of the clastic sedimentary rocks, Guining area
表 1 归宁地区三叠系西康群岩石地层特征
Table 1 Stratigraphic classification of the Triassic Xikang Group in the Guining area
群 组 代号 岩性描述 西康群 两河口组 T3lh 下部为深灰色厚层-块状变质砂岩夹板岩，中部为变质砂岩与板岩互层，上部以板岩为主夹变质砂岩 新都桥组 T3xd 灰黑色绢云母板岩、钙质板岩、粉砂质板岩为主夹少量薄-厚层状变质砂岩、极少量含砾细砂岩及灰岩透镜体 侏倭组 T3zw 深灰色薄-中层状变质砂岩与绢云母板岩、粉砂质板岩韵律互层 杂谷脑组 T3z 深灰色块状变质长石砂岩为主，夹灰黑色绢云母板岩、粉砂质板岩 扎尕山组 T2zg 深灰色中-厚层状变质长石细砂岩、变质钙质细砂岩夹深灰色粉砂质板岩、钙质板岩、薄-中层状灰岩 
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表 2 归宁地区西康群碎屑岩主量元素分析结果
Table 2 Major element concentration of the Xikang Group clastic sedimentary rocks in the Guining area
样品号 含量/% CIA ICV SiO2 Al2O3 Fe2O3 FeO CaO MgO K2O Na2O TiO2 P2O5 MnO PM02-126YQ1 72.72 8.10 1.66 1.76 4.57 1.38 1.34 1.51 0.35 0.18 0.04 65 1.38 PM02-127YQ1 51.92 14.95 1.85 4.14 6.57 3.77 3.04 1.06 0.69 0.15 0.10 74 1.16 PM02-12YQ1 53.04 9.58 1.06 3.93 11.87 3.10 1.62 1.03 0.53 0.14 0.11 72 2.09 PM02-18YQ1 55.36 7.14 2.92 1.11 13.56 1.82 1.37 1.03 0.43 0.16 0.14 68 2.86 PM02-21YQ1 67.79 7.49 0.50 1.98 7.31 2.12 1.30 1.43 0.45 0.12 0.05 64 1.73 PM02-40YQ1 52.56 16.28 0.79 4.65 6.31 3.34 3.30 0.90 0.61 0.26 0.09 76 1.02 PM02-44YQ1 67.83 6.48 0.90 1.84 8.86 1.68 0.94 1.42 0.29 0.17 0.09 63 2.20 PM02-74YQ1 71.54 8.64 1.75 2.17 3.85 1.93 1.55 1.65 0.51 0.12 0.05 64 1.33 PM02-91YQ1 52.93 15.52 2.48 4.56 4.74 4.10 3.30 1.02 0.74 0.18 0.13 74 1.09 PM02-108YQ1 65.23 8.38 0.77 2.79 6.05 2.88 1.53 1.49 0.49 0.12 0.05 65 1.57 PM19-18YQ1 72.62 8.23 1.95 2.16 4.30 1.46 1.45 1.08 0.11 0.14 0.13 70 1.34 PM19-35YQ1 71.52 9.43 0.13 3.30 3.78 3.26 1.35 1.49 0.29 0.11 0.05 69 1.10 PM19-82YQ1 75.74 9.33 0.34 2.34 1.68 2.70 1.35 1.60 0.32 0.13 0.04 69 0.82 PM19-112YQ1 73.73 8.28 0.36 3.38 3.50 2.37 0.91 1.52 0.20 0.14 0.07 68 1.19 PM19-106YQ1 78.15 7.95 0.39 2.23 2.34 1.76 1.28 1.33 0.13 0.10 0.07 67 0.97 PM10-97YQ1 43.15 13.28 2.00 7.89 13.26 4.08 2.99 2.93 2.05 0.38 0.11 60 2.34 PM10-101YQ1 69.84 9.77 0.85 3.06 4.08 2.81 1.96 1.28 0.57 0.13 0.04 68 1.21 PM10-106YQ1 67.61 8.94 1.23 2.87 5.97 2.42 1.83 1.31 0.53 0.13 0.06 67 1.54 PM10-107YQ1 67.82 9.16 1.13 3.23 5.24 2.47 1.96 1.40 0.53 0.13 0.06 66 1.47 PM15-48YQ1 57.39 17.23 3.09 5.88 4.96 3.85 3.57 1.38 0.80 0.16 0.15 73 1.14 PM10-81YQ1 57.23 14.94 1.29 10.71 1.61 3.58 1.15 2.58 2.10 0.19 0.22 76 1.30 PM10-11YQ1 63.48 8.46 0.75 3.12 9.15 2.36 1.70 1.27 0.48 0.11 0.09 67 1.95 PM10-14YQ1 66.54 8.91 1.33 2.97 6.82 2.64 1.74 1.17 0.61 0.13 0.06 69 1.64 PM10-46YQ1 73.96 9.99 0.32 2.12 2.88 2.28 2.52 0.90 0.58 0.12 0.05 70 0.93 PM10-48YQ1 74.72 9.91 0.75 2.80 2.24 1.98 1.90 1.01 0.50 0.082 0.05 72 0.93 测区平均值 64.98 10.25 1.22 3.48 5.82 2.65 1.88 1.39 0.60 0.15 0.08 69 1.45 PASS(上地壳) 62.40 18.88 7.18 — 1.29 2.19 3.68 1.19 0.99 0.16 2.19
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表 3 归宁地区西康群碎屑岩微量元素分析结果
Table 3 Trace element concentration of the Xikang Group clastic sedimentary rocks in the Guiling area
样品编号 元素含量/10-6 Cr/Zr Th/Sc Th/U Zr/Th Sc/Cr Cr Ni Co Li Rb Cs Sr Ba V Sc Nb Ta Zr Hf Ga U Th PM02-126YQ1 41.1 27.0 9.5 24.1 62.5 4.57 133 258 45.0 6.08 4.26 0.302 162 0.577 11.9 0.83 7.6 0.25 1.25 9.20 21.26 0.15 PM02-127YQ1 90.6 45.9 16.1 68.9 135.0 10.20 258 459 99.6 14.7 9.36 0.706 136 1.33 20.8 1.53 12.7 0.67 0.86 8.30 10.71 0.16 PM02-12YQ1 66.9 40.6 14.5 41.2 77.5 4.45 298 236 51.3 7.62 3.49 0.215 122 0.583 14.3 1.16 9.1 0.55 1.19 7.84 13.41 0.11 PM02-18YQ1 45.7 21.5 5.8 12.6 53.7 3.21 250 214 37.5 5.61 4.14 0.253 156 0.662 8.6 1.24 7.2 0.29 1.28 5.77 21.79 0.12 PM02-21YQ1 72.0 25.4 8.3 8.47 55.8 2.98 134 214 30.0 5.13 3.26 0.239 286 0.473 10.5 0.89 10.9 0.25 2.12 12.30 26.24 0.07 PM02-40YQ1 111.0 54.5 16.0 66.2 145.0 10.1 198 546 113.0 16.6 8.16 0.618 151 1.180 21.9 1.48 13.9 0.74 0.84 9.39 10.86 0.15 PM02-44YQ1 63.6 20.6 5.7 16.6 38.8 2.39 262 203 25.0 3.68 3.49 0.244 161 0.459 9.6 0.66 7.8 0.40 2.12 11.77 20.67 0.06 PM02-74YQ1 67.4 27.1 8.9 20.2 65.9 4.15 141 268 49.0 7.31 4.6 0.379 233 0.795 13.3 1.04 9.9 0.29 1.35 9.52 23.54 0.11 PM02-91YQ1 102.0 53.8 21.0 63.3 152.0 9.40 127 587 110.0 16 9.05 0.636 138 1.180 25.3 1.57 12.9 0.74 0.81 8.22 10.70 0.16 PM02-108YQ1 56.6 26.2 7.8 11.5 66.1 4.20 240 263 47.5 6.75 4.68 0.319 208 0.608 13.6 0.92 9.1 0.27 1.34 9.90 22.93 0.12 PM19-18YQ1 44.0 21.6 5.9 30.7 83.0 5.57 79 281 37.6 10.3 2.02 < 0.1 155 1.930 10.1 0.50 4.18 0.28 0.41 8.36 37.08 0.23 PM19-35YQ1 53.4 26.2 11.6 50.2 74.7 8.54 121 331 60.6 10.6 5.45 0.9 156 < 0.1 13.2 2.58 9.8 0.34 0.91 3.75 16.13 0.20 PM19-82YQ1 64.5 25.6 10.7 54.9 68.9 6.57 70 277 49.6 10.9 7.07 0.48 294 0.560 12.1 0.81 7.7 0.22 0.70 9.46 38.38 0.17 PM19-112YQ1 63.7 29.2 10.0 68.4 55.3 4.00 113 217 61.9 16.1 5.29 0.32 340 < 0.1 12.3 0.83 5.5 0.19 0.34 6.63 61.82 0.25 PM19-106YQ1 39.9 20.0 9.9 31.8 57.1 2.94 63 238 44.0 7.67 2.07 < 0.1 134 < 0.1 10.5 0.25 6.2 0.30 0.81 24.72 21.68 0.19 PM10-97YQ1 126 104.0 39.1 31.6 89.1 2.83 1180 395 170.0 19.6 40.6 2.96 252 1.07 24.5 1.39 8.6 0.50 0.44 6.18 29.34 0.16 PM10-101YQ1 84.9 36.2 12.1 28.6 76.0 4.04 128 445 54.2 9.54 5.05 0.325 247 0.396 12.7 1.40 10.7 0.34 1.12 7.64 23.08 0.11 PM10-106YQ1 69.3 33.7 12.0 26.7 72.7 4.10 246 381 46.8 7.99 4.93 0.347 209 0.514 13.3 0.98 9.5 0.33 1.18 9.65 22.09 0.12 PM10-107YQ1 75.4 34.2 13.3 28.6 77.6 5.42 228 397 48.8 8.28 5.36 0.428 214 0.481 12.7 1.15 9.9 0.35 1.20 8.64 21.53 0.11 PM15-48YQ1 105.0 51.2 20.0 33.9 161.0 7.67 239 547 132.0 17.5 15.6 1.19 138 0.111 24.0 1.64 13.7 0.76 0.78 8.35 10.07 0.17 PM10-81YQ1 155.0 81.2 26.9 39.6 38.0 0.76 410 252 213.0 24 52 3.36 299 1.300 24.4 0.63 7.26 0.52 0.30 11.52 41.18 0.15 PM10-11YQ1 62.6 31.3 10.3 24.4 71.2 4.68 239 318 45.9 6.87 8.05 0.594 178 0.371 12.6 1.02 8.9 0.35 1.30 8.73 20.00 0.11 PM10-14YQ1 86.9 30.4 10.5 29.8 70.4 5.45 233 335 46.8 8.24 10.7 0.845 353 0.347 14.3 1.44 11.9 0.25 1.44 8.26 29.66 0.09 PM10-46YQ1 61.8 48.5 13.9 38.1 92.5 6.33 102 314 59.2 12.9 11.2 0.809 143 0.269 16.0 0.36 8.1 0.43 0.63 22.38 17.65 0.21 PM10-48YQ1 44.2 33.9 9.8 26.6 63.4 5.37 138 328 40.2 8.59 7.9 0.617 143 0.313 12.0 0.49 7.9 0.31 0.92 16.15 18.15 0.19 测区平均 74.1 38.0 13.2 35.1 80.1 5.20 225 332 68.7 10.74 9.51 0.74 200.32 0.70 14.98 1.07 9.24 0.40 1.03 10.11 23.60 0.15 上地壳 63.88 36.03 11.13 29.73 74.38 5.46 178. 324 48.0 9.15 9.46 0.72 204.25 0.33 13.73 0.83 9.20
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表 4 归宁地区西康群碎屑岩稀土元素分析结果
Table 4 REE concentration of the Xikang Group clastic sedimentary rocks in the Guining area
样品编号 元素含量/10-6 特征值 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Y ∑REE/10-6 LREE/HREE (La/Yb)N Eu/Eu* PM02-126YQ1 27.1 41.5 6.19 25.7 3.75 0.709 3.09 0.372 1.46 0.215 0.651 0.089 0.609 0.115 5.6 111.55 15.90 31.92 0.62 PM02-127YQ1 37.4 73.8 8.73 31.6 5.76 1.100 4.70 0.541 2.11 0.309 0.907 0.152 0.978 0.192 7.64 168.28 16.02 27.43 0.63 PM02-12YQ1 24.9 39.6 5.47 25.5 3.97 0.831 3.60 0.504 2.44 0.413 1.190 0.216 1.210 0.218 10.6 110.06 10.24 14.76 0.66 PM02-18YQ1 17.1 27.5 3.75 16.5 3.01 0.655 2.96 0.423 2.04 0.394 1.010 0.198 1.140 0.200 9.83 76.88 8.190 10.76 0.66 PM02-21YQ1 38.0 70.2 8.04 29.6 5.2 0.872 4.30 0.498 2.02 0.294 0.835 0.135 0.800 0.151 7.76 160.95 16.82 34.07 0.55 PM02-40YQ1 38.5 72.2 8.31 30 5.65 1.100 4.70 0.576 2.16 0.313 0.944 0.152 0.965 0.188 8.21 165.76 15.58 28.62 0.63 PM02-44YQ1 25.4 40.4 5.2 23.3 3.38 0.697 3.32 0.425 1.87 0.333 0.907 0.161 0.914 0.160 8.35 106.47 12.16 19.93 0.63 PM02-74YQ1 36.7 72.8 8.11 28.3 5.07 0.832 4.09 0.483 1.88 0.261 0.725 0.101 0.616 0.124 7.94 160.09 18.33 42.74 0.54 PM02-91YQ1 37.7 72.4 8.38 31.3 5.88 1.200 4.76 0.585 2.30 0.337 0.918 0.174 1.010 0.182 8.38 167.13 15.28 26.77 0.67 PM02-108YQ1 31.2 49.5 6.91 29.2 4.22 0.761 3.55 0.407 1.50 0.255 0.623 0.092 0.569 0.110 5.83 128.90 17.14 39.33 0.59 PM19-18YQ1 22.4 42.5 4.56 18.0 3.42 0.640 2.44 0.330 0.93 0.240 1.100 0.160 0.420 0.160 6.87 97.30 15.83 38.26 0.64 PM19-35YQ1 22.4 42.0 4.82 19.8 3.33 0.780 3.22 0.380 2.68 0.280 1.360 0.150 1.300 0.099 13.3 102.60 9.84 12.36 0.72 PM19-82YQ1 31.2 59.6 6.31 24.4 4.42 0.820 4.36 0.760 2.96 0.270 1.480 0.240 2.640 0.310 8.03 139.77 9.74 8.48 0.56 PM19-112YQ1 30.0 53.4 5.68 25.2 3.60 0.680 3.60 0.610 3.28 0.320 1.540 0.130 1.860 0.220 9.31 130.12 10.26 11.57 0.57 PM19-106YQ1 22.4 41.8 4.64 20.9 3.10 0.720 2.97 0.420 1.36 0.420 1.040 0.110 1.510 0.180 7.89 101.57 11.68 10.64 0.72 PM10-97YQ1 52.8 110 13.8 58.1 10.70 2.600 10.20 1.560 7.67 1.390 3.720 0.558 2.610 0.365 36.9 276.07 8.83 14.51 0.75 PM10-101YQ1 36.4 67.9 8.07 30.4 5.35 0.979 4.79 0.572 2.42 0.353 0.980 0.151 0.842 0.146 9.05 159.35 14.54 31.01 0.58 PM10-106YQ1 34.6 54.4 7.55 34.2 5.14 0.941 4.42 0.513 2.16 0.321 0.946 0.162 0.883 0.161 8.1 146.40 14.30 28.11 0.59 PM10-107YQ1 32.5 62.7 7.55 28.1 5.01 0.981 4.08 0.526 2.31 0.358 0.969 0.150 0.895 0.160 8.81 146.29 14.48 26.05 0.64 PM15-48YQ1 37.8 72.5 8.62 33.0 6.00 1.320 5.82 0.910 4.68 0.972 2.680 0.455 2.340 0.358 28.5 177.46 8.74 11.59 0.67 PM10-81YQ1 48.5 98.4 12 47.4 8.94 1.930 8.15 1.270 6.81 1.320 3.340 0.508 2.130 0.241 34.1 240.94 9.14 16.33 0.68 PM10-11YQ1 29.7 50.1 6.27 28.3 4.4 0.910 4.00 0.590 2.98 0.585 1.660 0.262 1.450 0.274 16.2 131.48 10.14 14.69 0.65 PM10-14YQ1 40.6 77.2 8.78 32.7 5.73 1.080 5.69 0.817 4.31 0.862 2.350 0.406 2.070 0.334 25.1 182.93 9.86 14.07 0.57 PM10-46YQ1 25.2 52.4 6.04 26.9 3.81 0.685 3.39 0.410 1.81 0.292 0.867 0.131 0.654 0.106 8.33 122.70 15.02 27.64 0.57 PM10-48YQ1 19.9 41.2 4.51 21.0 3.19 0.619 2.68 0.359 1.60 0.275 0.766 0.117 0.638 0.121 7.02 96.98 13.79 22.37 0.63 测区平均 32.0 59.4 7.13 28.9 4.88 0.978 4.36 0.594 2.71 0.455 1.340 0.210 1.240 0.200 12.31 144.32 12.87 22.56 0.63 上地壳 30 64 7.1 26 4.5 0.88 3.8 0.64 3.5 0.8 2.3 0.33 2.2 0.32 22
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表 5 归宁地区西康群碎屑岩微量元素特征[55]
Table 5 Trace element features of the Xikang Group clastic sedimentary rocks in the Guining area
10-6 构造背景 Th U Zr Sc Co Sc/Cr Th/U Zr/Th Th/Sc 大洋岛弧 2.27±0.7 1.09±0.21 96±20 19.5±5.2 18±6.3 0.57±0.16 2.1±0.78 48.0±13.4 0.15±0.08 大陆岛弧 11.1±1.1 2.53±0.24 229±27 14.8±1.7 12±2.7 0.32±0.06 4.6±0.45 21.5±2.4 0.85±0.13 活动大陆边缘 18.8±3.0 3.90±0.5 179±33 8.0±1.1 10.0±1.7 0.30±0.02 4.8±0.38 9.5±0.7 2.59±0.5 被动大陆边缘 16.7±3.5 3.20±0.8 298±80 6.0±1.4 5.0±2.4 0.16±0.02 5.6±0.07 19.1±5.8 3.06±0.8 归宁地区西康群 9.24 1.07 200.32 10.74 — 0.15 10.11 23.60 1.03
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表 6 归宁地区西康群碎屑岩REE参数[58]
Table 6 Rare earth element features of the Xikang Group clastic sedimentary rocks in the Guining area
10-6 构造背景 La Ce ∑REE La/Yb (La/Yb)N LREE/HREE Eu/Eu* 大洋岛弧 8±1.7 19±3.7 58±10 4.2±1.3 2.8±0.9 3.8±0.9 1.04±0.11 大陆岛弧 27±4.5 59±8.2 146±20 11±3.6 7.5±2.5 7.7±1.7 0.79±0.13 安第斯型大陆边缘 37.00 78.00 186.0 12.50 8.5 9.10 0.60 被动大陆边缘 39.00 85.00 210.0 210.00 10.8 8.50 0.56 归宁地区西康群 32.0 59.4 114.32 13.95 22.56 12.87 0.63
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