松辽盆地南部海力锦地区上白垩统姚家组砂岩物源示踪及其构造背景综合研究：来自岩石地球化学及锆石U-Pb年代学的制约

臧亚辉; 李继木; 宁君; 王海涛

doi:10.19509/j.cnki.dzkq.2022.0153

松辽盆地南部海力锦地区上白垩统姚家组砂岩物源示踪及其构造背景综合研究：来自岩石地球化学及锆石U-Pb年代学的制约

doi: 10.19509/j.cnki.dzkq.2022.0153

核工业二四三大队, 内蒙古赤峰 024000

基金项目:

中国核工业地质局项目“内蒙古科左中旗海力锦地区铀矿普查” 201910-2

中国核工业地质局生产中科研项目“松辽盆地南部海力锦铀矿床铀富集成因机理研究” 202212-19

详细信息

作者简介:
臧亚辉(1989-), 男, 工程师, 主要从事铀矿地质勘查与研究工作。E-mail: cugzyh243@126.com

通讯作者:
李继木(1986-), 男, 高级工程师, 主要从事铀矿地质勘查与研究工作。E-mail: lijimu118@163.com

中图分类号: P588.21⁺.2.3
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- 文章访问数: 576
- PDF下载量: 107
- 被引次数: 0
出版历程
- 收稿日期: 2022-02-22
- 录用日期: 2022-04-13
- 修回日期: 2022-04-10

Provenance and tectonic setting of the Upper Cretaceous Yaojia Formation sandstones in the Hailijin area, southern Songliao Basin: Constraints from petrogeochemistry and zircon U-Pb chronology

Geologic Party No. 243, CNNC, Chifeng Inner Mongollia 024000, China

摘要

摘要:
针对可地浸砂岩型铀矿潜在铀储层预测、铀源评价而言, 明确赋矿砂体的物源是关键。海力锦铀矿床位于松辽盆地南部, 赋矿砂体为上白垩统姚家组灰色砂岩。系统采集了该矿床内16个钻孔中的26件样品, 首次对姚家组灰色、褐红色、褐黄色砂体展开了碎屑岩岩石学、地球化学及锆石年代学分析工作。测试结果表明, 这套多色砂岩在铀工业矿孔、矿化孔及无矿孔中整体表现较为一致, 均具高SiO₂, 相对较低的Al₂O₃、Fe₂O₃、MgO、MnO、Na₂O、TiO₂, 地球化学分类属于岩屑砂岩、亚岩屑砂岩类, 指示源岩可能为酸性岩类; 化学蚀变指数(CIA)值为62.93~83.46(平均74.08), 成分变异指数(ICV)值为0.4~1(平均0.6), 推测其经历过半干旱-半潮湿气候背景下的中等化学风化作用影响; 根据源岩属性判别其母岩主要为长英质(酸性)岩石, 且源区构造背景属于被动大陆边缘环境; 碎屑锆石U-Pb测年显示谐和年龄主要集中分布在3个年龄区间, 分别为180~110, 320~230, 2 536~1 738 Ma。结合岩石地层划分、盆缘岩浆岩年代以及区域构造演化特征, 推断海力锦地区姚家组下段沉积物最有可能来源于大兴安岭南缘的林西地区。
- 松辽盆地 /
- 姚家组 /
- 地球化学 /
- 锆石年代学 /
- 物源分析
Abstract: Objective
Tracing the provenance of host clastic rocks is key for understanding uranium reservoir projection and uranium source evaluation of alluvial uranium ore.
Methods
The Hailijin uranium ore, of which the host rock is the Upper Cretaceous Yaojia Formation, is located in the southern part of Songliao Basin, northeastern China. This paper performed detailed petrography, whole-rock geochemistry and detrital zircon U-Pb geochronology of sandstone in the Yaojia Formation.
Results
Twenty-six samples collected from 16 drill holes display high contents of SiO₂ and relatively low contents of Al₂O₃, Fe₂O₃, MgO, MnO, Na₂O and TiO₂, which plot in the area of lithic sandstone to sublithic sandstone, thus indicative of source rocks as the felsic components. The chemical index of alteration values range from 62.93 to 83.46, while the index of compositional variability values range from 0.4 to 1, which corresponds to moderate chemical weathering in a semiarid to semihumid climatic setting. The geochemical discriminant diagram shows that the tectonic background of the Yaojia Formation is a passive continental margin. Zircon U-Pb ages are mainly distributed at 180-110 Ma, 320-230 Ma and 2 536-1 738 Ma.
Conclusion
Combined with stratigraphy, magmatic records around the Songliao Basin and regional tectonic evolution, this study suggests that the sediments of the Yaojia Formation in the Hailijin were sourced from the Linxi area of the southern Great Xing'an Range.
- Songliao Basin /
- Yaojia Formation /
- geochemistry /
- zircon geochronology /
- provenance analysis
注释:

(所有作者声明不存在利益冲突)

HTML全文

图 1 松辽盆地构造单元区划图^[4]

Figure 1. Division of tectonic units in the Songliao Basin

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图 2 海力锦地区区域地质简图^[15]

Figure 2. Geological sketch map of the Hailijin area

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图 3 海力锦地区地层综合柱状图^[16]

Figure 3. Comprehensive stratigraphic histogram in the Hailijin area

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图 4 样品分布位置(a)及姚家组柱状图(b)

Figure 4. Sample distribution location (a) and vertical diagram of the Yaojia Formation (b)

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图 5 姚家组下段砂岩典型岩心照片(a~d)及偏光显微照片(e~f)

Q.石英；Pl.斜长石；Lv.火山岩岩屑；Bi.黑云母

Figure 5. Typical sandstone photos (a-d) and polarized micrographs (e-f) of the Lower Member of the Yaojia Formation

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图 6 海力锦地区姚家组砂岩陆源砂岩-页岩岩石分类图(底图据文献[21])

Figure 6. Classification of terrigenous sandstone-shale rocks in sandstones of the Yaojia Formation in the Hailijin area

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图 7 姚家组下段灰色砂岩中锆石CL图像和U-Pb分析点

Figure 7. CL images and U-Pb analysis points for zircons from the Yaojia Formation sandstone

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图 8 姚家组灰色砂岩中锆石U-Pb同位素谐和图(a)及频谱曲线直方图(b)

Figure 8. Zircon U-Pb concordia diagram (a) and age histogram diagram (b) from the Yaojia Formation sandstone

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图 9 海力锦地区姚家组砂岩ICV-CIA图(底图据文献[24-25]修改)

Figure 9. ICV-CIA diagram of the Yaojia Formation sandstone in the Hailijin area

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图 10 海力锦地区姚家组砂岩w(SiO₂)-w(Al₃O₂+K₂O+Na₂O)古气候判别图(底图据文献[26]修改)

Figure 10. Discrimination diagram of the SiO₂-(Al₃O₂ +K₂O+Na₂O) paleoclimate of the Yaojia Formation sandstones in the Hailijin area

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图 11 海力锦地区姚家组砂岩主量元素A-CN-K图(底图据文献[28]修改)

Figure 11. A-CN-K diagram of major elements of the Yaojia Formation sandstones in the Hailijin area

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图 12 姚家组砂岩K₂O/Na₂O-w(SiO₂)图(底图据文献[30]修改)

Figure 12. Diagram of K₂O/Na₂O-SiO₂ of the Yaojia Formation sandstones in the Hailijin area

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图 13 姚家组砂岩SiO₂/Al₂O₃-K₂O/Na₂O图(底图据文献[31]修改)

Figure 13. Diagram of SiO₂/Al₂O₃-K₂O/Na₂O of the Yaojia Formation sandstones

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图 14 海力锦地区晚白垩世姚家组与潜在物源区锆石U-Pb年龄概率龄谱对比图

Figure 14. Zircon U-Pb spectrum of the Late Cretaceous Yaojia Formation in the Hailijin area and potential source areas

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表 1 海力锦地区姚家组砂岩地球化学分析数据

Table 1. Data table of principal element analysis of the Yaojia Formation sandstones in the Hailijin area

样品编号	孔号	深度/ m	样品描述	SiO₂	Al₂O₃	CaO	Fe₂O₃	K₂O	MgO	MnO	Na₂O	P₂O₅	TiO₂	LOI	CIA	ICV
样品编号	孔号	深度/ m	样品描述	w_B/%											CIA	ICV
H1-1	ZK宝10-4	586.80	褐红色细砂岩	77.34	12.23	0.32	2.1	3.15	0.24	0.012	0.39	0.141	0.563	2.79	81.23	0.55
H1-2	ZK宝10-4	588.50	褐红色细砂岩	76.07	11.96	0.93	1.67	3.47	0.65	0.041	1.03	0.103	0.323	3.11	69.68	0.68
H2-1	HL16-7	574.10	灰色细砂岩	80.12	9.85	0.59	0.90	3.41	0.35	0.015	0.41	0.110	0.227	2.90	72.25	0.60
H2-2	HL16-7	575.00	灰色中砂岩	81.25	9.05	0.55	0.76	3.56	0.30	0.015	0.38	0.087	0.214	2.35	69.58	0.64
H2-3	HL16-7	577.70	灰色中砂岩	79.65	8.85	1.29	0.49	3.05	0.65	0.031	0.35	0.092	0.260	3.60	72.53	0.69
H2-4	HL16-7	580.80	灰色中砂岩	79.24	10.33	0.28	1.10	2.63	0.38	0.079	0.30	0.112	0.345	3.88	81.50	0.50
H3	ZKH0-2	566.00	灰色中砂岩	78.68	9.48	1.41	0.87	2.67	0.70	0.019	0.32	0.053	0.342	4.02	77.40	0.67
H4	ZK宝13-1	605.50	褐红色中砂岩	75.69	12.19	1.14	1.58	3.11	0.69	0.054	0.34	0.109	0.359	3.78	80.28	0.60
H5	ZKH1-6	592.43	灰色中砂岩	80.15	10.22	0.47	0.60	2.93	0.23	0.020	0.57	0.109	0.297	2.52	75.08	0.50
H6-1	ZKL32-8	593.10	灰色中砂岩	77.36	11.67	0.64	0.79	3.20	0.45	0.028	0.60	0.064	0.360	3.39	74.91	0.52
H6-2	ZKL32-8	541.50	灰色中砂岩	71.58	13.24	1.91	0.78	3.10	1.01	0.044	0.66	0.072	0.415	5.44	77.69	0.60
H7	ZKL24-0	550.20	灰色细砂岩	75.58	9.75	2.37	0.53	3.70	1.00	0.043	0.47	0.070	0.213	4.77	69.54	0.85
H8	ZKH2-4	571.10	灰色细砂岩	81.32	9.61	0.64	0.80	2.96	0.34	0.025	0.50	0.079	0.215	2.45	72.86	0.57
H9-1	ZKH0-6	530.15	灰色中砂岩	74.02	11.70	2.44	0.60	3.71	0.89	0.038	1.43	0.088	0.304	2.61	62.93	0.80
H9-2	ZKH0-6	511.05	灰色细砂岩	79.87	10.32	0.89	0.45	3.29	0.45	0.021	0.89	0.050	0.255	2.28	67.31	0.61
H9-3	ZKH0-6	539.50	灰色中砂岩	74.85	12.39	1.35	0.66	3.67	0.71	0.054	0.72	0.063	0.301	3.39	72.61	0.60
H9-4	ZKH0-6	580.55	灰色中砂岩	76.62	11.21	1.65	0.55	3.58	0.75	0.043	0.78	0.057	0.223	3.07	69.65	0.67
H9-5	ZKH0-6	588.95	灰色中砂岩	78.66	10.66	1.00	0.43	3.01	0.51	0.021	0.51	0.099	0.303	3.23	74.97	0.54
H10	ZKH1-12	609.00	灰色细砂岩	81.02	10.33	0.41	0.34	3.03	0.22	0.013	0.69	0.113	0.257	2.51	74.38	0.48
H11	ZKH2-3	596.65	褐黄色中砂岩	78.41	9.59	1.39	1.12	2.87	0.69	0.138	0.43	0.089	0.283	3.18	74.46	0.72
H12	ZKH4-6	621.15	灰色细砂岩	76.11	11.63	1.16	0.96	3.01	0.53	0.028	0.68	0.078	0.370	3.57	74.64	0.58
H13	ZKH0-1	579.70	灰色中砂岩	77.06	12.75	0.20	1.10	3.18	0.34	0.012	0.34	0.146	0.530	3.83	83.46	0.45
H14	ZK宝11-2	586.80	灰色中砂岩	73.39	11.99	2.41	0.81	3.21	0.98	0.035	0.72	0.102	0.401	4.93	73.90	0.71
H15	ZKH1-10	592.85	灰色中砂岩	72.87	12.52	1.28	0.70	3.06	0.69	0.104	0.76	0.100	0.420	4.96	75.15	0.56
PAAS				62.40	18.90	1.29	7.18	3.68	2.19	0.11	1.19	0.11	0.99
注：PAAS.澳大利亚后太古宙页岩; LOI.烧失量; CIA.化学蚀变指数；ICV.成分变异指数

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表 2 姚家组灰色砂岩(HL16-7)碎屑锆石LA-ICP-MS定年结果

Table 2. LA-ICP-MS dating results of zircons from the Yaojia Formation sandstones

分析点号	Th	U	Th/U	同位素比值							定年结果/Ma						谐和度/%
分析点号	w_B/10^-6		Th/U	²⁰⁷Pb/²⁰⁶Pb	±1σ	²⁰⁷Pb/²³⁵U	±1σ	²⁰⁶Pb/²³⁸U	±1σ		²⁰⁷Pb/ ²⁰⁶Pb	±1σ	²⁰⁷Pb/ ²³⁵U	±1σ	²⁰⁶Pb/ ²³⁸U	±1σ	谐和度/%
HL16-7-1	59	150	0.39	0.049 7	0.002 9	0.140 0	0.007 8	0.020 4	0.000 3		181	137	133	7	130	2	91
HL16-7-3	89	86	1.02	0.050 7	0.004 1	0.138 0	0.009 7	0.019 7	0.000 4		228	186	131	9	126	3	92
HL16-7-4	149	412	0.36	0.050 2	0.001 6	0.167 1	0.005 5	0.024 2	0.000 4		202	72	157	5	154	2	96
HL16-7-5	63	250	0.25	0.048 8	0.002 8	0.096 9	0.004 7	0.014 4	0.000 5		139	135	94	5	92	3	93
HL16-7-6	143	75	1.90	0.053 3	0.002 8	0.289 7	0.014 4	0.039 4	0.000 7		342	119	258	13	249	4	95
HL16-7-7	36	86	0.42	0.047 7	0.005 9	0.123 8	0.014 6	0.018 8	0.000 5		84	292	118	14	120	3	99
HL16-7-8	57	377	0.15	0.135 7	0.002 0	7.276 4	0.144 5	0.389 0	0.005 1		2 173	25	2 146	43	2 118	28	98
HL16-7-9	166	315	0.53	0.052 5	0.002 2	0.130 3	0.004 7	0.018 0	0.000 2		307	96	124	4	115	2	95
HL16-7-10	112	177	0.64	0.167 8	0.002 4	11.134 5	0.169 3	0.481 3	0.005 0		2 536	24	2 534	39	2 533	26	97
HL16-7-11	362	431	0.84	0.050 2	0.002 2	0.153 4	0.006 3	0.022 1	0.000 4		205	104	145	6	141	2	99
HL16-7-12	188	284	0.66	0.050 3	0.001 7	0.167 9	0.006 0	0.024 2	0.000 4		208	79	158	6	154	2	99
HL16-7-13	78	172	0.45	0.117 2	0.001 7	5.263 0	0.082 4	0.325 7	0.003 1		1 914	27	1 863	29	1 818	17	98
HL16-7-15	112	163	0.69	0.051 3	0.003 5	0.155 3	0.010 1	0.022 0	0.000 5		254	159	147	10	140	3	94
HL16-7-16	219	387	0.57	0.052 4	0.002 3	0.263 9	0.011 2	0.036 6	0.000 4		301	99	238	10	231	3	92
HL16-7-17	173	406	0.43	0.052 1	0.002 0	0.143 0	0.005 3	0.019 9	0.000 2		288	87	136	5	127	2	99
HL16-7-18	59	186	0.32	0.049 2	0.002 1	0.107 3	0.004 6	0.015 8	0.000 2		159	101	104	4	101	1	92
HL16-7-19	589	1 299	0.45	0.052 4	0.000 9	0.296 0	0.007 8	0.041 0	0.000 9		304	39	263	7	259	5	92
HL16-7-20	187	180	1.03	0.051 5	0.003 3	0.289 1	0.018 3	0.040 7	0.000 5		264	147	258	16	257	3	90
HL16-7-21	28	81	0.35	0.052 9	0.004 0	0.132 7	0.010 2	0.018 2	0.000 4		324	171	126	10	116	3	99
HL16-7-22	66	110	0.60	0.049 3	0.002 6	0.144 0	0.007 3	0.021 2	0.000 4		163	121	137	7	135	2	98
HL16-7-23	357	602	0.59	0.053 3	0.001 8	0.303 0	0.010 6	0.041 3	0.000 8		340	77	269	9	261	5	90
HL16-7-24	128	184	0.70	0.052 0	0.002 0	0.287 6	0.011 7	0.040 1	0.000 6		284	86	257	10	254	4	99
HL16-7-25	67	151	0.45	0.055 6	0.001 5	0.515 0	0.014 8	0.067 2	0.000 8		436	62	422	12	419	5	97
HL16-7-26	329	323	1.02	0.053 5	0.002 2	0.425 0	0.017 6	0.057 7	0.000 6		348	95	360	15	361	4	99
HL16-7-27	164	242	0.68	0.048 5	0.001 6	0.155 6	0.005 4	0.023 3	0.000 3		125	80	147	5	148	2	99
HL16-7-28	117	189	0.62	0.048 6	0.004 3	0.141 6	0.011 0	0.021 1	0.000 3		129	208	134	10	135	2	97
HL16-7-29	86	262	0.33	0.116 2	0.002 2	5.202 5	0.104 2	0.324 7	0.002 7		1 899	33	1 853	37	1 813	15	99
HL16-7-31	114	157	0.72	0.052 4	0.001 8	0.294 9	0.010 7	0.040 8	0.000 6		302	79	262	10	258	4	99
HL16-7-32	114	271	0.42	0.047 1	0.003 0	0.139 7	0.008 9	0.021 5	0.000 4		56	149	133	8	137	3	98
HL16-7-33	433	324	1.34	0.048 3	0.002 0	0.131 4	0.005 5	0.019 7	0.000 2		112	95	125	5	126	1	99
HL16-7-34	57	277	0.21	0.050 0	0.002 6	0.082 9	0.005 6	0.012 0	0.000 4		196	119	81	5	77	2	99
HL16-7-35	217	172	1.26	0.050 8	0.001 9	0.259 4	0.009 1	0.037 0	0.000 4		231	86	234	8	234	3	98
HL16-7-36	193	357	0.54	0.050 7	0.002 4	0.148 7	0.006 8	0.021 3	0.000 2		226	108	141	6	136	2	98
HL16-7-37	150	203	0.74	0.112 8	0.001 7	5.136 4	0.081 2	0.330 2	0.003 4		1 845	27	1 842	29	1 839	19	99
HL16-7-38	81	251	0.32	0.051 2	0.001 5	0.301 7	0.008 7	0.042 7	0.000 5		250	65	268	8	270	3	96
HL16-7-39	485	959	0.51	0.049 7	0.001 4	0.113 3	0.004 8	0.016 5	0.000 4		183	66	109	5	106	3	99
HL16-7-40	79	141	0.56	0.051 5	0.002 8	0.141 3	0.007 3	0.019 9	0.000 3		264	123	134	7	127	2	96
HL16-7-41	743	590	1.26	0.050 7	0.001 4	0.147 3	0.004 4	0.021 1	0.000 3		226	63	140	4	135	2	96
HL16-7-42	146	486	0.30	0.050 6	0.006 4	0.127 9	0.017 1	0.018 3	0.000 7		223	293	122	16	117	4	97
HL16-7-44	158	208	0.76	0.051 2	0.001 8	0.321 0	0.011 8	0.045 5	0.000 5		248	82	283	10	287	3	97
HL16-7-45	75	179	0.42	0.055 9	0.001 5	0.559 9	0.017 4	0.072 6	0.001 0		449	61	451	14	452	6	97
HL16-7-46	182	463	0.39	0.048 3	0.001 5	0.144 5	0.004 6	0.021 7	0.000 3		113	73	137	4	138	2	99
HL16-7-47	100	194	0.52	0.052 9	0.001 8	0.287 7	0.009 2	0.039 4	0.000 6		326	76	257	8	249	4	99
HL16-7-48	63	80	0.78	0.047 8	0.003 8	0.132 7	0.009 0	0.020 1	0.000 4		90	187	127	9	129	2	99
HL16-7-50	69	134	0.52	0.051 0	0.009 4	0.145 1	0.025 5	0.020 6	0.001 2		242	425	138	24	132	8	96
HL16-7-51	76	131	0.58	0.048 6	0.003 8	0.146 8	0.011 9	0.021 9	0.000 4		128	182	139	11	140	3	98
HL16-7-52	221	163	1.36	0.048 3	0.002 4	0.142 1	0.006 7	0.021 3	0.000 4		116	117	135	6	136	2	99
HL16-7-53	179	270	0.66	0.050 9	0.002 5	0.144 0	0.007 3	0.020 5	0.000 3		237	115	137	7	131	2	96
HL16-7-55	47	78	0.60	0.053 3	0.003 1	0.277 0	0.015 9	0.037 7	0.001 1		341	133	248	14	239	7	98
HL16-7-56	332	1 139	0.29	0.051 1	0.001 1	0.146 9	0.004 0	0.020 8	0.000 3		247	52	139	4	133	2	90
HL16-7-57	56	85	0.66	0.053 3	0.002 4	0.370 8	0.017 8	0.050 4	0.000 7		343	102	320	15	317	5	99
HL16-7-58	94	188	0.50	0.051 2	0.001 6	0.313 3	0.010 2	0.044 4	0.000 6		251	71	277	9	280	4	97
HL16-7-60	100	67	1.50	0.051 7	0.007 0	0.139 9	0.016 8	0.019 6	0.000 6		273	310	133	16	125	4	99
HL16-7-61	50	260	0.19	0.120 4	0.002 0	4.813 0	0.086 7	0.289 9	0.003 8		1 962	30	1 787	32	1 641	22	97
HL16-7-62	41	109	0.38	0.117 9	0.002 7	4.808 9	0.130 7	0.295 9	0.005 0		1 924	41	1 786	49	1 671	28	99
HL16-7-63	182	330	0.55	0.050 8	0.001 8	0.153 6	0.005 5	0.021 9	0.000 3		231	82	145	5	140	2	99
HL16-7-65	34	47	0.72	0.052 0	0.004 8	0.274 8	0.024 1	0.038 3	0.000 9		285	211	246	22	242	6	98
HL16-7-66	20	60	0.33	0.050 5	0.004 9	0.125 3	0.012 7	0.018 0	0.000 5		220	224	120	12	115	3	99
HL16-7-67	468	2 023	0.23	0.051 0	0.001 2	0.122 0	0.002 9	0.017 3	0.000 2		241	52	117	3	111	1	99
HL16-7-68	226	703	0.32	0.050 4	0.001 7	0.126 0	0.004 1	0.018 1	0.000 3		214	76	121	4	116	2	98
HL16-7-69	78	186	0.42	0.052 1	0.002 2	0.174 9	0.007 6	0.024 4	0.000 3		289	96	164	7	155	2	98
HL16-7-70	376	909	0.41	0.053 5	0.001 1	0.300 8	0.007 3	0.040 8	0.000 6		349	47	267	6	258	4	99
HL16-7-71	190	449	0.42	0.051 4	0.001 7	0.136 7	0.004 5	0.019 3	0.000 2		258	77	130	4	123	1	96
HL16-7-72	20	22	0.92	0.051 3	0.005 0	0.254 6	0.019 7	0.036 0	0.001 0		254	224	230	18	228	6	99
HL16-7-73	254	477	0.53	0.047 6	0.001 4	0.141 7	0.004 2	0.021 6	0.000 3	81	71	135	4	138	2	96
HL16-7-74	39	88	0.44	0.050 6	0.003 2	0.157 7	0.008 9	0.022 6	0.000 4	223	145	149	8	144	3	96
HL16-7-75	58	108	0.54	0.054 4	0.002 2	0.367 0	0.015 1	0.048 9	0.000 8	387	93	317	13	308	5	93
HL16-7-77	140	361	0.39	0.051 6	0.001 5	0.189 4	0.005 9	0.026 6	0.000 3	270	67	176	6	169	2	99
HL16-7-78	91	129	0.71	0.106 4	0.003 2	4.264 1	0.150 5	0.290 8	0.006 0	1 738	55	1 686	60	1 645	34	98
HL16-7-79	143	164	0.87	0.050 4	0.003 7	0.276 9	0.024 6	0.039 9	0.001 0	213	171	248	22	252	6	95
HL16-7-80	112	52	2.13	0.048 3	0.006 8	0.120 9	0.014 0	0.018 2	0.000 8	113	332	116	13	116	5	97
HL16-7-81	292	260	1.12	0.058 3	0.001 6	0.693 4	0.020 7	0.086 2	0.001 0	542	58	535	16	533	6	99
HL16-7-82	111	190	0.58	0.061 7	0.002 1	0.862 8	0.033 1	0.101 5	0.002 0	663	72	632	24	623	12	99
HL16-7-83	298	1 183	0.25	0.051 4	0.001 4	0.237 5	0.009 4	0.033 5	0.000 9	258	63	216	9	213	6	98
HL16-7-85	47	105	0.45	0.054 8	0.003 5	0.445 8	0.025 3	0.059 0	0.001 0	404	144	374	21	370	6	94

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表 3 不同构造背景主量元素特征参数对比

Table 3. Comparison of characteristic parameters of principal elements in different tectonic backgrounds

构造背景	主量元素特征参数
构造背景	w(Fe₂O₃+MgO)/%	w(TiO₂)/%	Al₂O₃/SiO₂	K₂O/Na₂O	Al₂O₃/(CaO+Na₂O)
大洋岛弧^[27]	11.73	1.06	0.29	0.39	1.72
大陆岛弧^[27]	6.79	0.64	0.20	0.61	2.42
主动大陆边缘^[27]	4.63	0.46	0.18	0.99	2.56
被动大陆边缘^[27]	2.89	0.49	0.10	1.60	4.15
姚家组砂岩(N=24)	1.43	0.32	0.14	6.17	8.20

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