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

doi:10.13745/j.esf.sf.2021.7.15

Abstract

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

CLC Number:

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.

Figures/Tables 14

References 45

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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