海南石碌地区早三叠世闪长玢岩脉U-Pb年代学及构造意义

李艳军; 魏俊浩; 伍刚; 谭俊; 石文杰; 赵少卿; 王永辉

doi:10.3799/dqkx.2013.025

海南石碌地区早三叠世闪长玢岩脉U-Pb年代学及构造意义

doi: 10.3799/dqkx.2013.025

1.
中国地质大学资源学院，湖北武汉 430074
2.
海南矿业股份有限公司，海南昌江 572700

基金项目:

全国危机矿山“桂东粤西地区铅锌金等矿床成矿规律总结研究”项目 20089946

中国地质大学(武汉)中央高校基本科研业务费专项基金 CUG110832

中国地质大学(武汉)中央高校基本科研业务费专项基金 CUG120702

国家自然科学基金项目 41202054

详细信息

作者简介:
李艳军(1982-)，男，博士，讲师，主要从事矿床地球化学、成矿规律与成矿预测教学和研究工作.E-mail: liyanjun21023@163.com

中图分类号: P597
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出版历程
- 收稿日期: 2012-03-18
- 刊出日期: 2013-03-01

Early Triassic Diorite-Porphyrite Dikes from the Shilu Area, Hainan Island: Zircon U-Pb Age and Tectonic Implication

1.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
Hainan Mining Co.Ltd., Changjiang 572700, China

摘要

摘要: 石碌铁矿床位于海南岛五指山褶皱带西段.矿区内外发育以闪长玢岩脉为主的中基性脉岩.LA-ICP-MS锆石U-Pb定年厘定闪长玢岩脉年龄为248±1 Ma(MSWD=0.4)，为早三叠世岩浆活动的产物，与同时代的富碱侵入岩体构成“双峰式”侵入岩.闪长玢岩脉为钾玄质系列，低SiO₂(49.18%~55.25%)、高Al₂O₃(14.36%~16.75%)、FeO_t(5.98%~10.07%)和MgO(3.80%~5.43%)，富集LILE和LREE，亏损HFSE.Nb/Ta、Zr/Hf和La/Nb比值分别为15.33~17.80、36.00~45.23和2.59~8.62；Pb同位素组成(²⁰⁶Pb/²⁰⁴Pb)_t=18.087~18.483，(²⁰⁷Pb/²⁰⁴Pb)_t=15.473~15.587，(²⁰⁸Pb/²⁰⁴Pb)_t=38.272~38.817.LREE/HFSE和LILE/HFSE比值及Pb同位素组成显示为富集地幔来源，但混染有少量的地壳物质.HFSE判别图解指示闪长玢岩脉形成于大陆边缘弧伸展背景，与晚二叠世印支板块NE向向华南地块俯冲造成的大陆边缘弧局部伸展有关.
- 闪长玢岩脉 /
- 早三叠世 /
- 大陆边缘弧 /
- 石碌铁矿床 /
- 地质年代学 /
- 海南岛
Abstract: The Shilu iron deposit is located in western section of the Wuzhishan Fold Belt, Hainan island.In this region, numerous intermediate-basic dikes dominated by diorite-porphyrite occurred. The dating of zircon from diorite-porphyrite dikes determined by LA-ICP-MS yields age of 248±1 Ma (MSWD=0.4), maybe bimodal intrusion with contemporary alkali-rich granites. Diorite-porphyrite dikes are dominated by shoshonitic rocks, which have SiO₂ varying from 49.18% to 55.25%, Al₂O₃ from 14.36% to 16.75%, FeO_t from 5.98% to 10.07% and MgO ranging from 3.80% to 5.43%. These dikes are enriched in large ion lithophile elements (LILE) and low rare earth elements (LREE) but depleted in high field strength element (HFSE).The Nb/Ta values of diorite-porphyrite vary from 15.33 to 17.80, Zr/Hf and La/Nb from 36.00 to 45.23 and 2.59 to 8.62, respectively.Two samples have (²⁰⁶Pb/²⁰⁴Pb)_t=18.087-18.483, (²⁰⁷Pb/²⁰⁴Pb)_t=15.473-15.589 and (²⁰⁸Pb/²⁰⁴Pb)_t=38.272-38.817, similar to the data of contemporary alkali-rich granites. Geochemical and Pb isotopic compositions indicate that these dikes are possibly derived from enriched mantle and slightly contaminated with crust.Hf/3-Th-Ta and Zr-Zr/Y discriminant diagrams imply these diorite-porphyrite dikes intruded in a local nextensional tectonic setting in continental arc, caused by the Indian plate northeastern subduction to the South China Block.
- diorite-porphyrite dike /
- Early Triassic /
- continental margin arc /
- Shilu iron deposit /
- geochronology /
- Hainan island

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图 1 海南岛地质略图(a，据许德如等, 2009修改)、石碌铁矿床地质简图(b，据许德如等, 2008修改)和钻孔Ck714柱状图(c，据海南省地勘局, 2009.海南省石碌铁矿床E19勘探线剖面图修改)

1.中新生代盖层；2.新生代玄武岩；3.白垩系砾岩层；4.早古生代火山碎屑岩；5.晚古生代火山-沉积岩；6.新元古代石碌群；7.古中元古代抱板群和片麻状花岗岩；8.新太古代杂岩；9.新元古界石碌群；10.新元古界石灰顶组；11.上、下石炭统；12.上、下二叠统；13.变基性岩；14.130~90 Ma花岗岩；15.270~180 Ma花岗岩；16.二叠纪花岗闪长岩；17.侏罗纪花岗闪长岩；18.闪长玢岩脉；19.花岗斑岩脉；20.辉绿玢岩脉；21.铁矿体；22.铜矿体；23.钴矿体；24.向斜；25.背斜；26.实测及推测断裂；27.地质界线；28.钻孔；29.取样点；W-E向断裂：①戈枕断裂，②白沙断裂；NE-SW向断裂：A=王五-文教断裂，B=昌江-琼海断裂，C=尖峰-吊罗断裂，D=就锁-陵水断裂

Fig. 1. Tectonic map of Hainan island (a), geological map of the Shilu iron deposit (b) and drill bore column of Ck714 (c)

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图 2 石碌地区闪长玢岩脉(ZrSL-2)中锆石形态和阴极发光(CL)图像

圆圈及其中数字分别表示分析点位和测点编号; 圈外年龄示²⁰⁶Pb/²³⁸U表面年龄

Fig. 2. Typical zircon morphology and CL images of diorite-porphyrite sample (ZrSL-2) from Shilu area

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图 3 闪长玢岩脉(ZrSL-2)锆石LA-ICPMS U-Pb年龄谐和图

加权平均年龄为去掉ZrSL-2-6和ZrSL-2-12外18个岩浆锆石测点的加权结果

Fig. 3. Concordia plots for zircons of diorite-porphyrite sample (ZrSL-2) from Shilu area

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图 4 闪长玢岩脉(ZrSL-2)锆石球粒陨石标准化稀土配分图解

球粒陨石值据Sun and McDonough(1989)

Fig. 4. Chondrite normalized REE patterns of diorite-porphyrite sample (ZrSL-2)

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图 5 闪长玢岩脉原始地幔标准化微量元素蛛网图(a)及球粒陨石标准化稀土配分曲线(b)

琼中中-早三叠世正长岩体数据周佐民等(2011).原始地幔和球粒陨石标准据Sun and McDonough (1989)

Fig. 5. Primitive mantle normalized trace element distributions (a) and chondrite normalized REE patterns (b) of diorite-porphyrite dikes from Shilu area

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图 6 闪长玢岩脉Nb/Y-Zr/TiO₂(a) (据Winchester and Floyd, 1976)和Ta/Yb-Th/Yb(b) (据Pearce, 1983)判别图解

WPB.板内玄武岩；MORB.洋中脊玄武岩；琼中中-早三叠世正长岩体数据周佐民等(2011)

Fig. 6. Nb/Y-Zr/TiO₂ (a) and Ta/Yb-Th/Yb (b) diagrams of diorite-porphyrite dikes

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图 7 闪长玢岩脉Hf/3-Th-Ta(a) (据Wood et al., 1979) 及Zr-Zr/Y(b) (据Pearce and Norry, 1979)构造判别图解

数据来源同图 6.N-MORB.洋中脊玄武岩；E-MORB+WPB.洋中脊玄武岩和板内拉斑玄武岩；WPB.板内碱性玄武岩；CAB.岛弧钙碱性玄武岩；IAT.岛弧拉斑玄武岩

Fig. 7. Hf/3-Th-Ta (a) and Zr-Zr/Y (b) diagrams to describe tectonic location of diorite-porphyrite dikes

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表 1 石碌地区闪长玢岩脉(ZrSL-2)锆石U-Pb定年分析结果

Table 1. LA-ICP-MS zircon U-Pb dating data of diorite-porphyrite sample (ZrSL-2) from Shilu area

测试点号	Th (10^-6)	U (10^-6)	Th/U	U-Th-Pb同位素比值								年龄(Ma)
测试点号	Th (10^-6)	U (10^-6)	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁸Pb/²³²Th	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁸Pb/²³²Th	1σ
ZrSL-2-1	537	1 220	0.44	0.047 9	0.002 9	0.261 4	0.014 7	0.039 2	0.000 4	0.012 5	0.000 3	100	131	236	12	248	3	252	6
ZrSL-2-2	183	404	0.45	0.049 8	0.003 0	0.270 7	0.015 7	0.039 4	0.000 5	0.012 2	0.000 4	187	144	243	13	249	3	246	8
ZrSL-2-3	917	1 712	0.54	0.047 2	0.002 2	0.257 5	0.011 5	0.039 2	0.000 5	0.011 4	0.000 3	57.5	107.4	233	9	248	3	229	6
ZrSL-2-4	2 377	4 155	0.57	0.051 6	0.001 9	0.280 5	0.010 8	0.038 8	0.000 4	0.012 3	0.000 4	333	83	251	9	245	3	247	8
ZrSL-2-5	873	932	0.94	0.049 8	0.001 8	0.268 7	0.009 8	0.038 8	0.000 4	0.011 5	0.000 3	187	116	242	8	245	3	230	6
ZrSL-2-6	756	1 807	0.42	0.050 5	0.001 5	0.288 8	0.008 7	0.041 1	0.000 4	0.012 4	0.000 3	220	69	258	7	260	2	249	7
ZrSL-2-7	194	505	0.38	0.049 4	0.002 2	0.269 7	0.011 5	0.039 7	0.000 6	0.011 8	0.000 5	165	138	242	9	251	4	237	10
ZrSL-2-8	430	555	0.77	0.050 1	0.002 0	0.267 5	0.010 2	0.038 9	0.000 4	0.011 9	0.000 3	211	97	241	8	246	3	239	6
ZrSL-2-9	159	374	0.43	0.050 7	0.002 9	0.274 0	0.014 8	0.039 3	0.000 6	0.012 3	0.000 5	228	127	246	12	249	4	247	10
ZrSL-2-10	540	530	1.02	0.049 9	0.002 1	0.270 9	0.010 9	0.039 4	0.000 5	0.012 8	0.000 3	191	92	243	9	249	3	256	7
ZrSL-2-11	355	1 221	0.29	0.048 1	0.001 7	0.263 8	0.009 6	0.039 5	0.000 4	0.012 2	0.000 4	106	85	238	8	250	3	244	7
ZrSL-2-12	795	1 886	0.42	0.053 1	0.002 1	0.312 6	0.012 8	0.042 3	0.000 5	0.014 3	0.000 4	345	89	276	10	267	3	287	9
ZrSL-2-13	1 328	4 582	0.29	0.050 8	0.001 1	0.278 2	0.006 2	0.039 5	0.000 5	0.011 9	0.000 3	232	45	249	5	250	3	240	6
ZrSL-2-14	552	552	1.00	0.049 0	0.002 6	0.264 3	0.014 0	0.039 0	0.000 4	0.012 3	0.000 4	146	124	238	11	247	3	246	7
ZrSL-2-15	108	380	0.28	0.051 6	0.002 1	0.279 9	0.011 5	0.039 3	0.000 5	0.013 0	0.000 5	265	97	251	9	248	3	261	11
ZrSL-2-16	382	560	0.68	0.054 2	0.002 9	0.291 1	0.014 6	0.039 1	0.000 5	0.012 8	0.000 4	389	120	259	11	247	3	256	8
ZrSL-2-17	56.9	169	0.34	0.054 5	0.005 6	0.297 2	0.031 9	0.038 8	0.000 7	0.011 4	0.000 8	394	233	264	25	245	5	229	16
ZrSL-2-18	596	672	0.89	0.053 8	0.002 0	0.291 2	0.010 3	0.039 4	0.000 5	0.012 2	0.000 3	365	81	259	8	249	3	245	6
ZrSL-2-19	368	1 266	0.29	0.054 0	0.001 6	0.295 8	0.008 5	0.039 6	0.000 4	0.012 7	0.000 3	372	65	263	7	250	2	256	6
ZrSL-2-20	607	738	0.82	0.054 8	0.002 4	0.297 8	0.012 8	0.039 3	0.000 5	0.013 3	0.000 4	467	96	265	10	248	3	267	7

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表 2 闪长玢岩脉(ZrSL-2)锆石微量元素分析结果(10^-6)

Table 2. Trace elements data of diorite-porphyrite sample (ZrSL-2) from Shilu area

点号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Ti	Eu/Eu^*	Ce/Ce^*	T_Zr(℃)±^†
ZrSL-2-1	28.98	98.06	12.54	66.02	21.09	0.78	47.67	14.27	166.58	62.75	288.64	61.05	564.52	109.19	1.52	0.07	1.26	-	-
ZrSL-2-2	0.01	6.97	0.09	2.11	3.93	0.34	20.07	6.87	82.56	31.91	142.76	29.15	269.71	52.76	2.42	0.09	23.58	1216	22
ZrSL-2-3	0.38	49.00	0.65	5.15	9.38	0.67	42.85	15.55	177.64	68.41	295.01	61.52	547.14	104.95	5.02	0.09	19.05	835	14
ZrSL-2-4	1.32	93.80	2.88	21.36	30.43	1.67	117.07	36.53	398.69	140.49	590.64	116.67	1 010.10	187.97	57.42	0.08	8.55	660	11
ZrSL-2-5	0.19	28.98	0.28	4.89	11.03	0.73	50.47	14.17	143.57	48.87	200.44	39.11	339.81	62.71	11.86	0.08	25.20	727	12
ZrSL-2-6	4.30	25.33	2.28	13.62	16.97	0.18	94.21	32.01	388.46	146.36	623.24	119.94	1 027.31	187.25	4.27	0.01	1.96	875	15
ZrSL-2-7	0.05	10.51	0.07	2.03	4.05	0.17	22.74	7.66	94.60	36.76	164.14	32.83	301.82	58.01	3.55	0.04	34.62	938	16
ZrSL-2-8	1.17	23.49	0.94	6.52	6.93	0.33	27.95	9.25	113.06	41.93	190.10	38.71	346.60	64.88	5.95	0.06	5.18	803	13
ZrSL-2-9	0.00	6.67	0.11	1.74	4.04	0.47	21.13	6.89	85.17	32.11	150.02	30.93	299.90	57.81	3.98	0.12		897	15
ZrSL-2-10	0.38	22.02	0.34	4.10	6.27	0.46	34.90	11.16	127.42	46.08	200.03	39.47	344.76	64.74	7.56	0.08	13.94	770	13
ZrSL-2-11	2.17	13.27	0.90	4.14	3.70	0.14	16.27	6.95	88.14	37.13	179.49	41.34	406.70	81.03	1.14	0.05	2.33	-	-
ZrSL-2-12	0.05	22.99	0.32	2.86	9.64	0.16	60.14	23.57	286.76	107.26	454.55	89.32	790.61	140.82	5.59	0.02	21.08	814	13
ZrSL-2-13	0.20	12.23	0.49	3.07	6.72	0.26	48.06	19.69	260.35	105.65	479.84	99.65	898.06	171.74	4.79	0.03	6.64	846	14
ZrSL-2-14	3.54	22.43	1.43	10.82	13.18	0.63	59.69	18.87	211.74	79.13	332.72	65.37	568.85	103.75	7.90	0.06	2.44	764	12
ZrSL-2-15	-	6.09	0.04	0.99	2.33	0.24	19.77	6.54	80.38	32.48	154.61	34.07	332.21	67.67	4.21	0.07		879	15
ZrSL-2-16	-	18.15	0.12	1.05	3.78	0.16	25.04	8.77	104.33	40.72	183.23	37.64	335.05	62.20	4.74	0.04		848	14
ZrSL-2-17	-	3.97	0.11	1.01	2.40	0.51	13.18	4.28	52.51	21.25	101.39	22.10	229.58	45.53	7.98	0.22		763	12
ZrSL-2-18	0.04	24.20	0.27	3.56	9.27	0.65	36.60	10.65	108.44	36.82	149.64	29.54	258.28	48.13	10.40	0.09	26.39	737	12
ZrSL-2-19	0.72	10.96	0.49	3.57	4.11	0.28	20.48	7.58	98.38	39.36	192.55	44.32	436.77	84.44	1.57	0.08	4.39	-	-
ZrSL-2-20	1.10	31.94	0.96	9.51	10.32	0.66	41.05	10.92	110.03	37.58	155.78	31.08	281.34	50.64	73.97	0.09	7.07	655	11
†: T_Zr(℃)为据Watson et al.(2006)Ti温度计log(Ti_zircon)=(6.01±0.03)－(5 080±30)/T(K)计算的锆石饱和温度.

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表 3 闪长玢岩脉主量元素(%)、微量及稀土元素(10^-6)分析结果

Table 3. Major (%) and trace elements (10^-6) compositions of diorite-porphyrite dikes from Shilu area

样号	SLN-8	SL-26	SL-27	ZM-5
SiO₂	52.00	46.00	49.18	55.25
Al₂O₃	15.88	12.13	16.75	14.36
FeO_t	10.07	8.24	8.52	5.98
CaO	6.68	7.04	9.68	6.17
MgO	4.03	12.50	5.43	3.80
Na₂O	2.79	1.27	3.53	3.67
K₂O	2.94	0.49	2.17	2.10
TiO₂	1.86	0.66	1.54	1.23
MnO	0.15	0.12	0.23	0.10
P₂O₅	0.73	0.16	1.11	0.59
LOI	2.69	10.90	1.24	6.28
Total	100.15	99.98	99.62	99.80
Mg^#	47.1	77.1	58.6	58.5
Na₂O+K₂O	5.73	1.76	5.70	5.77
K₂O/Na₂O	1.1	0.4	0.6	0.6
Cr	50	1 470	40	90
Co	26.3	47.8	23.8	24.4
Ga	20.3	13.9	20.5	17.8
Rb	135.0	24.8	112.5	74.3
Sr	571	249	1 120	429
Y	35	15.1	29.1	19.4
Zr	234	72	294	209
Nb	13.9	4.6	8.9	18.7
Ba	1 995	1 985	773	1 690
Hf	5.9	2.0	6.50	5.0
Ta	0.8	0.3	0.50	1.1
Pb	14	14	11	422
Th	18.40	3.54	14.65	10.15
U	2.45	1.09	2.69	1.52
La	65.70	12.90	76.70	48.40
Ce	140.00	28.10	149.50	99.20
Pr	18.05	3.66	18.15	12.00
Nd	66.60	14.20	63.50	43.50
Sm	11.80	3.08	11.40	7.56
Eu	3.06	0.89	2.77	1.75
Gd	10.55	3.21	9.94	6.38
Tb	1.35	0.50	1.20	0.80
Dy	6.88	2.99	5.90	3.71
Ho	1.38	0.63	1.12	0.73
Er	3.75	1.82	3.11	1.92
Tm	0.52	0.23	0.40	0.24
Yb	3.08	1.69	2.47	1.52
Lu	0.47	0.24	0.37	0.24
∑REE	333.19	74.14	346.53	227.95
(La/Yb)_N	15.3	5.5	22.3	22.8
Eu/Eu^*	0.82	0.86	0.78	0.75
Nb/Ta	17.38	15.33	17.80	17.00
Zr/Hf	39.66	36.00	45.23	41.80
Hf/Sm	0.50	0.65	0.57	0.66
La/Ta	82.13	43.00	153.40	44.00
Ba/Nb	143.53	431.52	86.85	90.37
Rb/Zr	0.58	0.34	0.38	0.36
La/Nb	4.73	2.80	8.62	2.59
Mg^#=100×Mg²⁺/(Mg²⁺+0.9×FeO_t/80).

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表 4 闪长玢岩脉Pb同位素分析结果

Table 4. Pb isotopic compositions of diorite-porphyrite dikes from Shilu area

编号	²⁰⁶Pb/²⁰⁴Pb	²⁰⁷Pb/²⁰⁴Pb	²⁰⁸Pb/²⁰⁴Pb	(²⁰⁶Pb/²⁰⁴Pb)_t	(²⁰⁷Pb/²⁰⁴Pb)_t	(²⁰⁸Pb/²⁰⁴Pb)_t
SLN-8	18.679±0.006	15.596±0.003	39.290±0.008	18.483	15.587	38.817
SL-27	18.091±0.003	15.473±0.003	38.281±0.007	18.087	15.473	38.272
海南中-早三叠世正长岩				18.487~18.714	15.580~15.657	38.503~38.682
注：校正年龄为t=248 Ma；海南中-早三叠世正长岩Pb同位素测试对象为长石，由7件样品组成，谢才富等(2005, 2006)和周佐民等(2011).

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海南石碌地区早三叠世闪长玢岩脉U-Pb年代学及构造意义

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李艳军(1982-)，男，博士，讲师，主要从事矿床地球化学、成矿规律与成矿预测教学和研究工作.E-mail: liyanjun21023@163.com

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Early Triassic Diorite-Porphyrite Dikes from the Shilu Area, Hainan Island: Zircon U-Pb Age and Tectonic Implication

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海南石碌地区早三叠世闪长玢岩脉U-Pb年代学及构造意义

doi: 10.3799/dqkx.2013.025

作者简介: 李艳军(1982-)，男，博士，讲师，主要从事矿床地球化学、成矿规律与成矿预测教学和研究工作.E-mail: liyanjun21023@163.com

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Early Triassic Diorite-Porphyrite Dikes from the Shilu Area, Hainan Island: Zircon U-Pb Age and Tectonic Implication

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作者简介:
李艳军(1982-)，男，博士，讲师，主要从事矿床地球化学、成矿规律与成矿预测教学和研究工作.E-mail: liyanjun21023@163.com