甘肃北山牛圈子地区志留纪骆驼圈西岩体的岩石成因及构造意义

余吉远; 计波; 郭琳

甘肃北山牛圈子地区志留纪骆驼圈西岩体的岩石成因及构造意义

余吉远^{1, 2, 3,},
计波^{1, 2, 3},
郭琳^{1, 2}

1.
中国地质调查局西安地质调查中心，陕西西安 710054
2.
中国地质调查局造山带地质研究中心，陕西西安 710054
3.
国土资源部岩浆作用成矿与找矿重点实验室，陕西西安 710054

基金项目:

中国地质调查局地质调查项目“特殊地质地貌区填图试点” DD20160060

国家自然科学基金中天山阿拉塔格环状杂岩体成因研究 41202045

中国地质大调查项目甘肃北山牛圈子地区6幅1:5万区域地质调查 12120113046400

详细信息

作者简介:
余吉远(1978-)，男，高级工程师，从事区域地质矿产调查、岩石地球化学研究。E-mail：yujiyuan111@163.com

中图分类号: P595, P597
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出版历程
- 收稿日期: 2016-11-03
- 刊出日期: 2017-04-01

THE PETROGENESIS AND TECTONIC SIGNIFICANCES OF SILURIAN WEST-LUOTOUJUAN ROCKS FROM BEISHAN NIUJUANZI AREA IN GANSU PROVINCE, NW CHINA

YU Ji-yuan^{1, 2, 3
,},
JI Bo^{1, 2, 3},
GUO Lin^{1, 2}

1.
Xi'an Center of Geological Survey, CGS, Xi'an 710054, Shannxi, China
2.
Orogen Research Center of China Geological Survey, Xi'an 710054, Shannxi, China
3.
Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Ministry of Land and Resources, Xi'an 710054, Shannxi, China

摘要

摘要: 北山牛圈子地区的骆驼圈西埃达克岩为过铝质钙碱性岩浆系列，具有高的SiO₂(>57.94%)、Al₂O₃(>16.66%)和低的MgO( < 4.32%)含量, 较高的Na₂O/K₂O比值(＞3.13)，显示富钠的特征; 而在微量元素上，高Sr(589×10^-6~1170×10^-6)，低Y (4.60×10^-6~13.90×10^-6)和Yb (0.43×10^-6~1.32×10^-6)；轻重稀土分异明显(La/Dy)_N=4.60~13.87、(La/Yb)_N=7.17~20.58，Eu异常不明显(Eu/Eu^*=0.85~1.32)；富集轻稀土和大离子亲石元素，而亏损高场强元素Nb，Ta，Ti和重稀土HREE，与世界上典型的俯冲洋壳熔融形成的埃达克岩特征相似。结合区域上埃达克岩的研究成果和岀露的构造位置，以及与牛圈子蛇绿岩的关系，认为骆驼圈西埃达克岩是志留纪(U-Pb年龄为428.9 Ma)时期热的洋壳向公婆泉—东七一山早古生代活动陆缘带俯冲过程中部分熔融的产物。对该岩体的研究，为进一步研究北山造山带早古生代北山洋盆闭合和晚古生代北山洋盆重新裂开提供新的依据。
- 埃达克岩 /
- 锆石U-Pb年龄 /
- 志留纪 /
- 俯冲洋壳的部分熔融 /
- 骆驼圈西岩体 /
- 甘肃北山
Abstract: West-Luotuojuan Adakitesin Beishan Niujuanzi Area belongs to Peraluminous calcium alkaline magma series with a high content of SiO₂(>57.94%), Al₂O₃(>16.66%), a low content of MgO( < 4.32%), a relatively high Na₂O/K₂O ratio, displaying Na-rich feature. In respect of trace elements, it has a high content of Sr (589×10^-6~1170×10^-6), a low content of Y (4.60×10^-6~13.90×10^-6) and Yb (0.43×10^-6~1.32×10^-6).The differentiation of light and heavy rare earth is obvious ((La/Dy)_N=4.60~13.87, (La/Yb)_N=7.17~20.58), and there is not obvious anomaly of Eu (Eu/Eu^*=0.85~1.32). Rich in light rare earth and large ionlithophile elements, and the loss of high field-strength elements Nb, Ta, Ti and heavy rare earth HREE, are similar with the typical Adakite rocks which formed by subducted oceanic crust melting.It is believed that West-Luotuojuan Adakite is a partial melting product which warm oceanic crust in Silurian (U-Pb age of 428.9 Ma) period moving to Gongpo spring-east Qiyi mountain early Paleozoic active continental margin in the process of subduction. The study of the rock mass provides evidence for the view that Beishan orogenic belt closed in the late early Paleozoic and split anew in the early late Paleozoic.
- Adakite /
- U-Pb age /
- Silurian /
- partial melting of the subducted oceanic crust /
- West-Luotuojuan rock mass /
- Beishanin Gansu province

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图 1 牛圈子地区地质简图^[22]

Figure 1. Geological sketch in Niujuanzi area

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图 2 石英闪长岩和英云闪长岩镜下照片

Figure 2. Microscope photographs of Quartz diorite and Tonalite

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图 3 骆驼圈西岩体主量元素地球化学特征

Figure 3. Covariation diagram of selected major oxides MgO, CaO and Na₂O/K₂O versus SiO₂ in West-Luotuojuan Rocks

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图 4 骆驼圈西岩体位微量元素蛛网图和稀土元素配分曲线^[24]

Figure 4. Primitive mantle normalized trace elements spider diagrams and chondrite normalized REE distribution patterns of West-Luotuojuan Rocks

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图 5 代表性锆石CL图像

Figure 5. CL images of representative zircons

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图 6 单颗粒锆石的谐和图及²⁰⁶Pb/²³⁸U加权平均年龄直方图

Figure 6. Concordia diagram and weighted average ²⁰⁶Pb/²³⁸U age for single-grain zircon from West-Luotuojuan rocks

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图 7 骆驼圈西岩体Sr/Y-Y和(La/Yb)_N-Yb_N判别图^[2]

Figure 7. Discrimination diagram of Sr/Y-Y and (La/Yb)_N-Yb_N for West-Luotuojuan rocks

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图 8 埃达克岩与玄武岩的实验熔融体的SiO₂-MgO图解^[29]

Figure 8. SiO₂-MgO diagrams of the experimental melt of adakite and the basalts

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图 9 骆驼圈西岩体Y-Nb图和R1-R2图

Figure 9. Y-Rb relation of the granites and R1-R2 diagram of West-Luotuojuan rocks

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表 1 牛圈子地区埃达克岩主量(%)与微量元素(10^-6)化学分析结果

Table 1. Major and trace element compositions of the adakite from Niujuanzi region

sample岩性	131042	131062	131044	131064	132001	131061	131012	131041
sample岩性	英云闪长岩					石英闪长岩
SiO₂	69.17	66.68	67.70	66.87	65.10	57.94	60.16	60.54
TiO₂	0.25	0.34	0.35	0.31	0.36	0.86	0.67	0.67
Al₂O₃	16.59	17.42	16.66	17.35	17.32	18.49	17.05	17.10
Fe₂O₃	0.90	1.14	1.15	1.18	1.83	1.99	1.86	1.84
FeO	1.37	1.72	1.88	1.56	1.42	2.79	3.79	3.49
MnO	0.05	0.05	0.06	0.05	0.06	0.08	0.09	0.10
MgO	0.97	1.35	1.37	1.27	1.54	4.32	3.61	3.33
CaO	3.86	4.46	4.48	4.70	4.63	7.58	6.47	5.69
K₂O	1.03	1.26	1.20	1.07	0.81	0.94	0.92	1.21
Na₂O	4.64	4.73	4.24	4.57	4.85	3.33	3.60	3.77
P₂O₅	0.11	0.13	0.14	0.13	0.13	0.13	0.19	0.21
LOI	0.89	0.51	0.55	0.77	1.79	1.22	1.15	1.63
total	99.84	99.79	99.78	99.82	99.84	99.67	99.56	99.57
AR	1.77	1.75	1.69	1.69	1.69	1.39	1.48	1.56
A/CNK	1.74	1.67	1.68	1.68	1.68	1.56	1.55	1.6
Mg ^#	0.44	0.47	0.46	0.46	0.47	0.63	0.54	0.54
Cr	8.5	8.9	14	9.8	11.7	34.9	55.4	48.9
Ni	5.55	7.94	10.4	7.05	13.2	18.7	46	40.8
V	39.2	54.4	51.4	50.5	59.7	112	147	121
Sc	4.82	5.21	5.22	5.25	7.28	12.1	14.5	15
Co	5.99	8	8.49	7.43	9.34	18.2	20.5	19.6
Rb	21.5	29.1	25.8	16.3	13	20.1	23.5	37.6
Cs	1	2.28	1.46	1.34	0.76	0.8	1.26	1.74
Sr	595	654	602	695	694	1170	592	589
Ba	313	355	408	407	277	191	272	315
Ga	17.4	18.7	17.9	18.1	18.3	19.3	19.3	19.1
Pb	12.6	12	9.02	11.3	9.6	6.89	10.1	10.2
U	0.57	0.62	0.58	0.47	0.52	0.44	1.06	1.56
Th	4.05	1.17	3.79	1.5	1.99	1.08	4.32	4.76
Nb	2.36	2.36	3.11	1.92	2.42	2.54	3.42	5.38
Ta	0.22	0.22	0.28	0.18	0.15	0.2	0.29	0.43
Zr	84.1	74.5	103	63.3	90.1	79.3	129	88.9
Hf	2.79	2.1	2.86	1.69	2.57	2.47	3.44	2.65
Y	5.05	5.22	6.41	4.6	6.93	10.9	13	13.9
La	13.2	6.47	11.6	8.58	7.56	10	12.9	16.8
Ce	26.5	14	23.9	18.2	17.6	24.8	29.5	38.2
Pr	3.28	1.72	2.8	2.13	2.43	3.32	3.85	5.03
Nd	11.2	7.29	10.6	8.17	10	13.5	15.6	19.6
Sm	2.19	1.81	2.19	1.62	2.13	2.91	3.76	4.31
Eu	0.56	0.65	0.8	0.67	0.69	1.08	1.1	1.12
Gd	1.53	1.47	1.8	1.42	1.78	2.65	3.28	3.57
Tb	0.2	0.19	0.25	0.18	0.25	0.4	0.48	0.52
Dy	1.02	1.03	1.42	0.97	1.46	2.33	2.72	2.96
Ho	0.18	0.2	0.24	0.19	0.29	0.44	0.52	0.54
Er	0.47	0.5	0.64	0.48	0.71	1.1	1.32	1.41
Tm	0.06	0.08	0.09	0.07	0.10	0.16	0.20	0.21
Yb	0.46	0.47	0.64	0.43	0.65	1	1.29	1.32
Lu	0.059	0.074	0.076	0.066	0.093	0.14	0.19	0.2
∑REE	60.91	35.95	57.04	43.17	45.74	63.83	76.71	95.79
LREE	56.93	31.94	51.89	39.37	40.41	55.61	66.71	85.06
HREE	3.98	4.01	5.15	3.80	5.33	8.22	10.00	10.73
Eu/Eu ^*	0.89	1.18	1.20	1.32	1.05	1.17	0.94	0.85
(La/Yb) _N	20.58	9.87	13	14.31	8.34	7.17	7.17	9.13
(Ho/Yb) _N	1.18	1.28	1.13	1.33	1.34	1.32	1.21	1.23
(La/Dy) _N	13.87	6.73	8.75	9.48	5.55	4.60	5.08	6.08
Eu/Eu^*=Eu_N/(Sm_N×Gd_N)^1/2，(La/Yb)_N、(Ho/Yb)_N、(La/Dy)_N is ratio of Chondrite ^[24]

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表 2 北山造山带骆驼圈西英云闪长岩锆石U-Pb同位素分析结果

Table 2. LA-ICP-MS U-Pb zircons dating results of sample (132053) from West-Luotuojuan in Beishan orogen

Analysis_#	Th	U	Th/U	Pb207/Pb206		Pb207/U235		Pb206/U238		Pb208/Th232		Pb207/U235		Pb206/U238		Pb208/Th232
Analysis_#	Th	U	Th/U	ratio	1sigma	ratio	1sigma	ratio	1sigma	ratio	1sigma	ratio	1sigma	ratio	1sigma	ratio	1sigma
132053-01	81.69	3550.82	0.02	0.05571	0.00092	0.43564	0.00730	0.05672	0.00079	0.04629	0.00186	367.2	5.16	355.6	4.8	914.5	35.84
132053-02	28.94	1223.24	0.02	0.05675	0.00089	0.44718	0.00720	0.05715	0.00077	0.02215	0.00060	375.3	5.05	358.3	4.69	442.9	11.95
132053-03	157.31	4170.61	0.04	0.05856	0.00099	0.46470	0.00796	0.05755	0.00081	0.03784	0.00155	387.5	5.52	360.7	4.92	750.6	30.28
132053-04	50.28	2494.59	0.02	0.05756	0.00095	0.46393	0.00781	0.05845	0.00080	0.02060	0.00064	387	5.41	366.2	4.89	412.1	12.6
132053-05	223.89	2183.09	0.10	0.10248	0.00165	0.84796	0.01387	0.06001	0.00083	0.06666	0.00205	623.5	7.62	375.7	5.07	1304.4	38.86
132053-06	503.50	554.08	0.91	0.05582	0.00092	0.52517	0.00878	0.06823	0.00093	0.02101	0.00057	428.6	5.84	425.5	5.62	420.3	11.22
132053-07	197.21	450.71	0.44	0.05550	0.00103	0.52273	0.00967	0.06831	0.00097	0.02156	0.00070	427	6.45	426	5.88	431.2	13.79
132053-08	366.42	421.73	0.87	0.05524	0.00117	0.52042	0.01076	0.06833	0.00102	0.02038	0.00063	425.4	7.18	426.1	6.16	407.9	12.45
132053-09	205.79	313.27	0.66	0.05508	0.00099	0.51935	0.00935	0.06838	0.00097	0.02067	0.00062	424.7	6.25	426.4	5.83	413.5	12.19
132053-10	184.73	419.12	0.44	0.05537	0.00097	0.52254	0.00920	0.06844	0.00096	0.02217	0.00067	426.8	6.14	426.8	5.76	443.3	13.25
132053-11	425.11	672.40	0.63	0.05454	0.00089	0.51680	0.00858	0.06872	0.00093	0.02161	0.00059	423	5.74	428.5	5.64	432.1	11.71
132053-12	166.55	281.16	0.59	0.05709	0.00120	0.54205	0.01111	0.06885	0.00103	0.02243	0.00074	439.8	7.32	429.2	6.2	448.3	14.65
132053-13	257.49	655.48	0.39	0.05789	0.00147	0.55007	0.01334	0.06891	0.00114	0.01945	0.00132	445	8.74	429.6	6.85	389.4	26.22
132053-14	431.94	865.59	0.50	0.05818	0.00118	0.55336	0.01103	0.06899	0.00103	0.02131	0.00217	447.2	7.21	430.1	6.23	426.1	42.92
132053-15	206.52	355.68	0.58	0.06019	0.00129	0.57471	0.01196	0.06925	0.00106	0.02185	0.00076	461.1	7.71	431.6	6.37	436.9	15.01
132053-16	65.00	248.92	0.26	0.06119	0.00120	0.58951	0.01143	0.06987	0.00102	0.02470	0.00101	470.6	7.3	435.4	6.15	493.2	19.97
132053-17	54.30	125.52	0.43	0.06421	0.00193	0.61913	0.01749	0.06994	0.00128	0.02492	0.00119	489.3	10.97	435.8	7.72	497.6	23.43

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