黑龙江多宝山地区晚三叠世岩浆活动对蒙古—鄂霍茨克洋南向俯冲的响应

doi:10.13745/j.esf.sf.2021.7.15

地学前缘 ›› 2022, Vol. 29 ›› Issue (2): 132-145.DOI: 10.13745/j.esf.sf.2021.7.15

• 洋板块地质与造山带地质 • 上一篇下一篇

黑龙江多宝山地区晚三叠世岩浆活动对蒙古—鄂霍茨克洋南向俯冲的响应

刘宝山¹(), 程招勋², 寇林林¹^,^*(), 邓昌州³, 杨晓平¹, 张春鹏¹, 李成禄², 韩仁萍¹

1.中国地质调查局沈阳地质调查中心, 辽宁沈阳 110034
2.黑龙江省自然资源调查院, 黑龙江哈尔滨 150036
3.中国科学院地球化学研究所矿床地球化学国家重点实验室, 贵州贵阳 550081

收稿日期:2021-05-22 修回日期:2021-07-18 出版日期:2022-03-25 发布日期:2022-03-31
通信作者: 寇林林
作者简介:刘宝山(1970—),男,教授级高级工程师,主要从事地质矿产调查工作。E-mail: liubaoshan1111@163.com
基金资助:
国家重点研发计划项目(2017YFC0601305);中国地质调查局地质调查项目(DD20190156);中国地质调查局“全国陆域及海区地质图件更新与共享项目”(DD20190372)

Late Triassic magmatic activity in Duobaoshan area, Heilongjiang Province: Response to the southward subduction of the Mongol-Okhotsk Ocean

LIU Baoshan¹(), CHENG Zhaoxun², KOU Linlin¹^,^*(), DENG Changzhou³, YANG Xiaoping¹, ZHANG Chunpeng¹, LI Chenglu², HAN Renping¹

1. Shenyang Geological Survey Center, China Geological Survey, Shenyang 110034, China
2. Natural Resources Survey Institute of Heilongjiang Province, Haerbin 150036, China
3. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China

Received:2021-05-22 Revised:2021-07-18 Online:2022-03-25 Published:2022-03-31
Contact: KOU Linlin

摘要/Abstract

摘要：

近年来相继在嫩江多宝山地区发现了一系列晚三叠世岩浆岩。但该期岩浆活动的构造背景、成因机制及成矿作用迄今尚未得到很好的解读,这些问题对深入理解该地区构造演化、寻找多金属矿产具有重要意义。本文以多宝山矿区英云闪长岩、争光矿区闪长岩为研究对象进行系统的岩石学、地球化学及同位素年代学研究。锆石的LA-ICP-MS定年结果表明,多宝山英云闪长岩形成时代为(226.3±2.3) Ma,争光闪长岩形成时代为(229.3±3.1) Ma,两者在误差范围内一致,可能是同一岩浆房演化的产物。地球化学特征显示,多宝山英云闪长岩以高SiO₂(64.25%~66.44%)、Al₂O₃(16.54%~17.21%)、K₂O+Na₂O(8.16%~8.49%),低CaO(2.27%~2.95%)、MgO(0.99%~1.16%)、TiO₂(0.31%~0.36%)、P₅O₂(0.16%~0.17%)为特征;争光闪长岩以SiO₂(57.12%~58.5%)、Al₂O₃(14.59%~15.26%)、(Na₂O+K₂O)(5.34%~6.16%)、 TiO₂(0.83%~0.97%)、P₂O₅(0.15%~0.27%)及TFeO/MgO(1.12~1.25)相近为特征;多宝山英云闪长岩亏损Rb、Nb、Sm,富集Ba、U、Zr和Sr,Eu正异常明显(δEu=1.21~1.57),争光闪长岩Rb、Nb、Sm亏损,Ba、Th、Sr、Hf富集,Eu弱正异常(δEu=0.93~1.22)。二者富集轻稀土元素(LREE),亏损重稀土元素(HREE),稀土及微量曲线形态近似,显示同一源区的特征,原始岩浆起源于受俯冲流体交代的地幔楔的部分熔融,形成于与蒙古—鄂霍茨克洋板块俯冲有关的活动大陆边缘环境。多宝山矿集区晚三叠世钙碱性岩浆岩的确定指示蒙古—鄂霍茨克洋俯冲作用可影响到兴安地块东缘。综合区域晚三叠世矿床成矿时代及成矿背景,证实多宝山地区晚三叠世岩浆活动具有较强的银铜钼成矿能力,成矿潜力巨大。

关键词: 多宝山地区, 晚三叠世, 岩浆活动, 成矿作用, 蒙古—鄂霍茨克洋

Abstract:

Late-Triassic magmatic rocks have been discovered in recent years in the Duobaoshan area of Nenjiang. So far, the tectonic setting, genesis and metallogeny of the magmatic activity have not been well understood, which significantly hindered our understanding of the regional tectonic evolution and prospecting for polymetallic deposits in this area. In this paper, we conducted systematic petrological, geochemical and geochronological studies of tonalite in the Duobaoshan deposit and diorite in the Zhengguang deposit. LA-ICP-MS zircon U-Pb dating yielded an age of (226.3±2.3) Ma for the Duobaoshan tonalite and (229.3±3.1) Ma for the Zhengguang diorite, indicating the two minerals, with similar formation age, are probably derived from the same magma chamber. The tonalite had elevated SiO₂ (64.25%-66.44%), Al₂O₃ (16.54%-17.21%), (K₂O+Na₂O) (8.15%-8.50%) and low CaO (2.27%-2.95%), MgO (0.99%-1.16%), TiO₂ (0.31%-0.36%) and P₅O₂ (0.16%-0.17%) contents comparable with the diorite whose major element contents were SiO₂ (57.12%-58.5%), Al₂O₃ (14.59%-15.26%), Na₂O+K₂O (5.34%-6.16%), TiO₂ (0.83%-0.97%), and P₂O₅ (0.15%-0.27%), with similar FeO/MgO (1.12-1.25) ratio. The Duobaoshan tonalite is characterized by depletions of Rb, Nb, and Sm, enrichments of Ba, U, Zr and Sr, and obvious positive Eu anomaly (δEu, 1.21-1.57). The Zhengguang diorite is characterized by depletion of Rb, Nb and Sm, enrichment of Ba, Th, Sr, Hf, and weak positive Eu anomaly (δEu, 0.93-1.22). Both tonalite and diorite are rich in light rare earth elements (LREE) and depleted in heavy rare earth elements (HREE), and have similar curve pattern on REE or trace element diagrams suggesting a common magmatic source. The magma probably derived from the partial melting of the mantle wedge metasomatized by the subduction fluid dehydrated from the downward moving Mongol-Okhotsk plate. The confirmation of the calc-alkaline magmatism in the Duobaoshan district indicates the subduction of the Mongol-Okhotsk oceanic plate can have remote influence, reaching as far as the eastern margin of the Xing’an Block. By compiling the metallogenic ages and background of the Late Triassic deposits in the study area, we can show that the Late Triassic magmatic activity in Duobaoshan area has great Ag-Cu-Mo mineralization ability and the study area has high exploration potential.

Key words: Duobaoshan area, Late Triassic, magmatism, mineraliation, Mongol-Okhotsk ocean

中图分类号:

刘宝山, 程招勋, 寇林林, 邓昌州, 杨晓平, 张春鹏, 李成禄, 韩仁萍. 黑龙江多宝山地区晚三叠世岩浆活动对蒙古—鄂霍茨克洋南向俯冲的响应[J]. 地学前缘, 2022, 29(2): 132-145.

LIU Baoshan, CHENG Zhaoxun, KOU Linlin, DENG Changzhou, YANG Xiaoping, ZHANG Chunpeng, LI Chenglu, HAN Renping. Late Triassic magmatic activity in Duobaoshan area, Heilongjiang Province: Response to the southward subduction of the Mongol-Okhotsk Ocean[J]. Earth Science Frontiers, 2022, 29(2): 132-145.

图/表 14

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岩石名称	分析点号	分析元素 w_B/10^-6		Th/U	同位素比值				表面年龄/Ma
岩石名称	分析点号	Th	U	Th/U	²⁰⁷Pb /²⁰⁶Pb	1σ	²⁰⁷Pb /²³⁵U	1σ	²⁰⁶Pb /²³⁸Pb	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ
多宝山英云闪长岩 (DBS01)	DBS01-1	67.7	98.5	0.7	0.055 5	0.003 5	0.260 8	0.015 7	0.034 2	0.000 5	217.1	2.9	431.5	140.7
	DBS01-2	112	142	0.8	0.052 6	0.002 8	0.253 6	0.013 2	0.035 5	0.000 5	224.7	2.8	309.3	122.2
	DBS01-3	55.4	78.5	0.7	0.052 5	0.003 4	0.265 6	0.016 1	0.037 1	0.000 6	235.0	3.6	309.3	148.1
	DBS01-4	65.6	110	0.6	0.055 7	0.002 7	0.267 4	0.013 0	0.034 9	0.000 4	221.1	2.8	442.6	109.2
	DBS01-5	118	145	0.8	0.056 0	0.002 8	0.270 4	0.013 0	0.035 3	0.000 4	223.4	2.4	450.0	111.1
	DBS01-6	125	152	0.8	0.053 3	0.002 5	0.264 7	0.012 8	0.036 2	0.000 5	229.1	2.9	342.7	112.0
	DBS01-7	109	156	0.7	0.050 4	0.002 6	0.247 8	0.012 0	0.036 2	0.000 5	229.4	3.0	213.0	120.4
	DBS01-8	94.2	136	0.7	0.056 0	0.002 7	0.273 7	0.013 5	0.035 6	0.000 5	225.4	2.9	453.8	113.9
	DBS01-9	75.0	122	0.6	0.052 7	0.002 5	0.259 5	0.011 8	0.035 9	0.000 4	227.1	2.7	322.3	102.8
	DBS01-10	77.5	122	0.6	0.050 8	0.002 8	0.244 9	0.012 4	0.035 0	0.000 4	222.0	2.4	235.3	134.2
	DBS01-11	239	248	1.0	0.051 2	0.001 9	0.259 6	0.009 8	0.036 7	0.000 4	232.2	2.5	250.1	83.3
	DBS01-12	80.6	117	0.7	0.055 9	0.003 5	0.262 7	0.016 8	0.034 4	0.000 5	218.0	2.9	450.0	138.9
	DBS01-13	107	139	0.8	0.050 3	0.002 5	0.246 1	0.012 1	0.035 6	0.000 4	225.6	2.7	209.3	110.2
	DBS01-14	93.2	121	0.8	0.051 5	0.002 6	0.249 5	0.013 4	0.034 9	0.000 4	221.1	2.5	264.9	116.7
	DBS01-15	100.0	147	0.7	0.052 4	0.002 4	0.260 6	0.011 9	0.036 1	0.000 4	228.4	2.8	301.9	137.9
	DBS01-16	64.5	106	0.6	0.053 5	0.002 6	0.272 9	0.012 8	0.037 1	0.000 5	235.0	3.1	350.1	109.2
	DBS01-17	80.0	119	0.7	0.053 1	0.002 8	0.262 9	0.012 5	0.036 3	0.000 5	230.0	2.9	344.5	118.5
	DBS01-18	96.6	135	0.7	0.054 6	0.002 6	0.269 5	0.012 1	0.036 1	0.000 4	228.7	2.7	394.5	105.5
	DBS01-19	89.6	116	0.8	0.050 3	0.003 4	0.243 0	0.016 2	0.035 3	0.000 4	223.7	2.8	209.3	155.5
	DBS01-20	88.3	145	0.6	0.050 9	0.002 6	0.261 1	0.013 1	0.037 3	0.000 4	235.8	2.5	235.3	113.9
	DBS01-21	107	153	0.7	0.055 4	0.002 3	0.283 3	0.011 3	0.037 3	0.000 4	236.2	2.7	427.8	94.4
	DBS01-22	266	242	1.1	0.052 1	0.0022	0.249 4	0.010 0	0.034 9	0.000 3	220.9	2.1	287.1	99.1
	DBS01-23	128	149	0.9	0.055 0	0.002 4	0.263 9	0.011 8	0.034 9	0.000 4	221.2	2.6	409.3	98.1
	DBS01-24	50.1	89.3	0.6	0.051 3	0.003 3	0.252 6	0.015 5	0.035 7	0.000 5	226.1	3.0	253.8	151.8
	DBS01-25	74.5	139	0.5	0.050 3	0.002 6	0.249 4	0.012 5	0.036 4	0.000 5	230.5	3.1	209.3	122.2
争光闪长岩 (ZG01)	ZG01-01	1 289	902	1.4	0.056 9	0.002 0	0.299 0	0.010 3	0.038 1	0.000 4	241	2.737 28	487	79.622 5
	ZG01-02	1 921	1 010	1.9	0.050 7	0.001 5	0.251 5	0.007 5	0.035 9	0.000 3	227	2.164 81	233	70.357 5
	ZG01-03	1 962	1 019	1.9	0.051 8	0.001 5	0.255 9	0.007 4	0.035 8	0.000 4	227	2.340 53	276	68.51
	ZG01-04	767	758	1.0	0.050 8	0.001 6	0.265 7	0.008 9	0.037 8	0.000 5	239	3.020 16	232	67.58
	ZG01-05	2 070	1 045	2.0	0.051 9	0.001 6	0.256 8	0.007 8	0.035 8	0.000 4	227	2.284 59	283	68.51
	ZG01-06	1 774	939	1.9	0.050 9	0.001 8	0.249 0	0.008 7	0.035 5	0.000 4	225	2.428	239	81.467 5
	ZG01-07	1 904	1 114	1.7	0.050 7	0.001 6	0.244 8	0.007 7	0.035 1	0.000 4	222	2.294 65	233	74.062 5
	ZG01-08	1 712	935	1.8	0.050 7	0.001 6	0.247 8	0.007 7	0.035 4	0.000 4	224	2.193 36	228	72.21
	ZG01-09	2 254	1 263	1.8	0.050 3	0.001 3	0.262 0	0.007 3	0.037 6	0.000 5	238	2.828 32	209	93.505
	ZG01-10	2 673	1 278	2.1	0.054 2	0.001 6	0.282 0	0.008 3	0.037 5	0.000 4	237	2.463 02	389	60.18
	ZG01-11	2 246	1 120	2.0	0.053 3	0.001 7	0.263 3	0.008 6	0.035 6	0.000 4	225	2.405 73	343	39.81
	ZG01-12	1 915	965	2.0	0.053 6	0.001 8	0.265 6	0.009 1	0.035 7	0.000 4	226	2.553 19	367	75.92
	ZG01-13	1 002	741	1.4	0.046 5	0.004 3	0.231 8	0.026 0	0.034 3	0.000 5	218	2.908 19	33.4	198.12
	ZG01-14	1 810	972	1.9	0.052 1	0.001 7	0.269 1	0.008 5	0.037 3	0.000 5	236	2.81508	300	74.065
	ZG01-15	902	643	1.4	0.052 9	0.002 1	0.268 8	0.010 5	0.036 7	0.000 4	232	2.602 88	324	90.73
	ZG01-16	2 560	1 289	2.0	0.050 9	0.001 4	0.252 7	0.006 9	0.035 8	0.000 4	227	2.340 81	235	62.952 5
	ZG01-17	2 883	1 634	1.8	0.051 0	0.001 3	0.263 0	0.006 8	0.037 1	0.000 4	235	2.235 85	243	54.62
	ZG01-18	1 642	1 207	1.4	0.051 7	0.001 5	0.240 2	0.006 6	0.033 4	0.000 3	212	1.922 73	272	66.657 5
	ZG01-19	2 178	1 152	1.9	0.050 0	0.001 5	0.253 3	0.007 5	0.036 5	0.000 4	231	2.604 17	195	70.357 5

岩石名称	分析点号	分析元素 w_B/10^-6		Th/U	同位素比值				表面年龄/Ma
岩石名称	分析点号	Th	U	Th/U	²⁰⁷Pb /²⁰⁶Pb	1σ	²⁰⁷Pb /²³⁵U	1σ	²⁰⁶Pb /²³⁸Pb	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ
多宝山英云闪长岩 (DBS01)	DBS01-1	67.7	98.5	0.7	0.055 5	0.003 5	0.260 8	0.015 7	0.034 2	0.000 5	217.1	2.9	431.5	140.7
	DBS01-2	112	142	0.8	0.052 6	0.002 8	0.253 6	0.013 2	0.035 5	0.000 5	224.7	2.8	309.3	122.2
	DBS01-3	55.4	78.5	0.7	0.052 5	0.003 4	0.265 6	0.016 1	0.037 1	0.000 6	235.0	3.6	309.3	148.1
	DBS01-4	65.6	110	0.6	0.055 7	0.002 7	0.267 4	0.013 0	0.034 9	0.000 4	221.1	2.8	442.6	109.2
	DBS01-5	118	145	0.8	0.056 0	0.002 8	0.270 4	0.013 0	0.035 3	0.000 4	223.4	2.4	450.0	111.1
	DBS01-6	125	152	0.8	0.053 3	0.002 5	0.264 7	0.012 8	0.036 2	0.000 5	229.1	2.9	342.7	112.0
	DBS01-7	109	156	0.7	0.050 4	0.002 6	0.247 8	0.012 0	0.036 2	0.000 5	229.4	3.0	213.0	120.4
	DBS01-8	94.2	136	0.7	0.056 0	0.002 7	0.273 7	0.013 5	0.035 6	0.000 5	225.4	2.9	453.8	113.9
	DBS01-9	75.0	122	0.6	0.052 7	0.002 5	0.259 5	0.011 8	0.035 9	0.000 4	227.1	2.7	322.3	102.8
	DBS01-10	77.5	122	0.6	0.050 8	0.002 8	0.244 9	0.012 4	0.035 0	0.000 4	222.0	2.4	235.3	134.2
	DBS01-11	239	248	1.0	0.051 2	0.001 9	0.259 6	0.009 8	0.036 7	0.000 4	232.2	2.5	250.1	83.3
	DBS01-12	80.6	117	0.7	0.055 9	0.003 5	0.262 7	0.016 8	0.034 4	0.000 5	218.0	2.9	450.0	138.9
	DBS01-13	107	139	0.8	0.050 3	0.002 5	0.246 1	0.012 1	0.035 6	0.000 4	225.6	2.7	209.3	110.2
	DBS01-14	93.2	121	0.8	0.051 5	0.002 6	0.249 5	0.013 4	0.034 9	0.000 4	221.1	2.5	264.9	116.7
	DBS01-15	100.0	147	0.7	0.052 4	0.002 4	0.260 6	0.011 9	0.036 1	0.000 4	228.4	2.8	301.9	137.9
	DBS01-16	64.5	106	0.6	0.053 5	0.002 6	0.272 9	0.012 8	0.037 1	0.000 5	235.0	3.1	350.1	109.2
	DBS01-17	80.0	119	0.7	0.053 1	0.002 8	0.262 9	0.012 5	0.036 3	0.000 5	230.0	2.9	344.5	118.5
	DBS01-18	96.6	135	0.7	0.054 6	0.002 6	0.269 5	0.012 1	0.036 1	0.000 4	228.7	2.7	394.5	105.5
	DBS01-19	89.6	116	0.8	0.050 3	0.003 4	0.243 0	0.016 2	0.035 3	0.000 4	223.7	2.8	209.3	155.5
	DBS01-20	88.3	145	0.6	0.050 9	0.002 6	0.261 1	0.013 1	0.037 3	0.000 4	235.8	2.5	235.3	113.9
	DBS01-21	107	153	0.7	0.055 4	0.002 3	0.283 3	0.011 3	0.037 3	0.000 4	236.2	2.7	427.8	94.4
	DBS01-22	266	242	1.1	0.052 1	0.0022	0.249 4	0.010 0	0.034 9	0.000 3	220.9	2.1	287.1	99.1
	DBS01-23	128	149	0.9	0.055 0	0.002 4	0.263 9	0.011 8	0.034 9	0.000 4	221.2	2.6	409.3	98.1
	DBS01-24	50.1	89.3	0.6	0.051 3	0.003 3	0.252 6	0.015 5	0.035 7	0.000 5	226.1	3.0	253.8	151.8
	DBS01-25	74.5	139	0.5	0.050 3	0.002 6	0.249 4	0.012 5	0.036 4	0.000 5	230.5	3.1	209.3	122.2
争光闪长岩 (ZG01)	ZG01-01	1 289	902	1.4	0.056 9	0.002 0	0.299 0	0.010 3	0.038 1	0.000 4	241	2.737 28	487	79.622 5
	ZG01-02	1 921	1 010	1.9	0.050 7	0.001 5	0.251 5	0.007 5	0.035 9	0.000 3	227	2.164 81	233	70.357 5
	ZG01-03	1 962	1 019	1.9	0.051 8	0.001 5	0.255 9	0.007 4	0.035 8	0.000 4	227	2.340 53	276	68.51
	ZG01-04	767	758	1.0	0.050 8	0.001 6	0.265 7	0.008 9	0.037 8	0.000 5	239	3.020 16	232	67.58
	ZG01-05	2 070	1 045	2.0	0.051 9	0.001 6	0.256 8	0.007 8	0.035 8	0.000 4	227	2.284 59	283	68.51
	ZG01-06	1 774	939	1.9	0.050 9	0.001 8	0.249 0	0.008 7	0.035 5	0.000 4	225	2.428	239	81.467 5
	ZG01-07	1 904	1 114	1.7	0.050 7	0.001 6	0.244 8	0.007 7	0.035 1	0.000 4	222	2.294 65	233	74.062 5
	ZG01-08	1 712	935	1.8	0.050 7	0.001 6	0.247 8	0.007 7	0.035 4	0.000 4	224	2.193 36	228	72.21
	ZG01-09	2 254	1 263	1.8	0.050 3	0.001 3	0.262 0	0.007 3	0.037 6	0.000 5	238	2.828 32	209	93.505
	ZG01-10	2 673	1 278	2.1	0.054 2	0.001 6	0.282 0	0.008 3	0.037 5	0.000 4	237	2.463 02	389	60.18
	ZG01-11	2 246	1 120	2.0	0.053 3	0.001 7	0.263 3	0.008 6	0.035 6	0.000 4	225	2.405 73	343	39.81
	ZG01-12	1 915	965	2.0	0.053 6	0.001 8	0.265 6	0.009 1	0.035 7	0.000 4	226	2.553 19	367	75.92
	ZG01-13	1 002	741	1.4	0.046 5	0.004 3	0.231 8	0.026 0	0.034 3	0.000 5	218	2.908 19	33.4	198.12
	ZG01-14	1 810	972	1.9	0.052 1	0.001 7	0.269 1	0.008 5	0.037 3	0.000 5	236	2.81508	300	74.065
	ZG01-15	902	643	1.4	0.052 9	0.002 1	0.268 8	0.010 5	0.036 7	0.000 4	232	2.602 88	324	90.73
	ZG01-16	2 560	1 289	2.0	0.050 9	0.001 4	0.252 7	0.006 9	0.035 8	0.000 4	227	2.340 81	235	62.952 5
	ZG01-17	2 883	1 634	1.8	0.051 0	0.001 3	0.263 0	0.006 8	0.037 1	0.000 4	235	2.235 85	243	54.62
	ZG01-18	1 642	1 207	1.4	0.051 7	0.001 5	0.240 2	0.006 6	0.033 4	0.000 3	212	1.922 73	272	66.657 5
	ZG01-19	2 178	1 152	1.9	0.050 0	0.001 5	0.253 3	0.007 5	0.036 5	0.000 4	231	2.604 17	195	70.357 5

黑龙江多宝山地区晚三叠世岩浆活动对蒙古—鄂霍茨克洋南向俯冲的响应

Late Triassic magmatic activity in Duobaoshan area, Heilongjiang Province: Response to the southward subduction of the Mongol-Okhotsk Ocean

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