吉林抚松四道砬子河岩组斜长角闪岩成因

摘要/Abstract

摘要：

在吉林抚松地区出露有一套太古宙角闪岩相变质岩石,其形成时代和成因机制长期存在争议。选定其中的斜长角闪岩作为研究对象,进行了岩石学、矿物学、岩石地球化学、锆石U-Pb年代学系统研究,分析了其形成过程,探讨了同时期构造岩浆演化背景。斜长角闪岩LA-ICP-MS锆石U-Pb测年取得的岩浆型锆石年龄分别为(2 555±13) Ma、(2 528±13) Ma、(2 529±9.8) Ma,表明其形成于新太古代晚期(2.55~2.50 Ga)。主量元素平均化学成分与基性火山岩中玄武岩成分相似,SiO₂ 含量为46.22%~59.6%,平均值为51.13%;Al₂O₃含量11.83%~17.59%,平均值为13.42%。稀土元素总量53.74×10^-6 ~219.07×10^-6,平均值为108.17×10^-6,(La/Yb)_N=2.07~8.98,平均值5.19,表明轻稀土相对富集且轻重稀土分馏较明显。微量元素中较富集K、Rb、Ba等大离子亲石元素(LILE);亏损Zr、Ti、Nd、Ta等高场强元素(HFSE)。综合岩石矿物组成及地球化学成分特征,认为吉林抚松地区斜长角闪岩属正变质岩,原岩应为玄武质火山岩,岩浆主要来源于亏损地幔,同时伴有少量古老地壳的混染再造,形成于岛弧环境,该区是华北克拉通新太古代吉—辽—冀弧陆碰撞增生造山带的北延部分。

关键词: 新太古代, 斜长角闪岩, 四道砬子河组, 吉林

Abstract:

The formation age and genetic mechanism of the set of metamorphic rocks of Archean amphibolite facies, outcropped in Fusong area of Jilin Province, is a long-existed and unresolved problem. This paper selected the amphibolite from the metamorphic rocks as the studying object, and analyzed the forming process and discussed the evolution background of the contemporaneous tectonomagmatism by systematically studying petrology, mineralogy, petrogeochemistry and zircon U-Pb chronology characteristics. LA-ICP-MS U-Pb zircon dating of magmatic zircons yields the ages of (2,555±13) Ma, (2,528±13)Ma and (2,529±9.8) Ma, which indicates that the formation age of the magma belongs to Late Neoarchean (2.55-2.50 Ga). The average contents of the major elements are similar to those of basalt; the contents of SiO₂ are ranging from 46.22% to 59.6%with the average of 51.13%; while contents of Al₂O₃ are from 11.83% to 17.59% with the average of 13.42%.The total REE content are ranging from 53.74×10^-6 to 219.07×10^-6,and the average is 108.17×10^-6. The ratios of (La/Yb)_N range from 2.07 to 8.98 with the average of 5.19,which indicates that the light rare earth elements (LREE) are relative enrichment and the light-heavy REEs are obviously fractionated. The contents of trace elements in the amphibolite are characterized by relative enrichment in large ion lithophile elements (LILE), i.e.K, Rb and Ba, and by depletion in high field-strength elements (HFSE), i.e., Zr, Ti, Nd and Ta. The primary rock of this set of metamorphic rock association is regarded as basaltic volcanic by comprehensively studying their mineral composition and geochemical component, thus the metamorphic rocks belong to orthometamorphite. The magma, formed in the island-arc environment, is mainly derived from depleted mantle and simultaneously accompanied by the contamination and reconstruction of a small quantity of old crust. This study area was considered to be the northern extension part of Neoarchean Jilin-Liaoning-Hebei arc-continent collisional accretion-type orogenic belt of North China Craton.

Key words: Neo-Archean, amphibolite, Sidaolazihe Formation, Jilin

中图分类号:

佟智强, 郑常青, 崔雪文, 郭文科, 田建东. 吉林抚松四道砬子河岩组斜长角闪岩成因[J]. 现代地质, 2017, 31(06): 1187-1200.

TONG Zhiqiang, ZHENG Changqing, CUI Xuewen, GUO Wenke, TIAN Jiandong. Genesis of Amphibolite of Sidaolazihe Formation in Fusong Area,Jilin Province[J]. Geoscience, 2017, 31(06): 1187-1200.

图/表 12

图1 华北克拉通东北部太古宙岩石分布图(a据李鹏川等[5])和研究区地质简图(b)

Fig.1 The distribution map of Archean rocks in the northeast of the North China Craton (a)modified after LI et al.[5]) and schematic diagram of the study area(b)

图2 斜长角闪岩宏观和显微照片 (a)斜长角闪岩被后期花岗岩穿插破坏;(b)长英质条带的韧塑性变形;(c)塑形纵弯柔流褶皱;(d)斜长角闪岩片麻理;(e-h)斜长角闪岩正交偏光、单偏光镜下照片;Pl.斜长石;Hb.角闪石;Qtz.石英

Fig.2 Macrographs and micrographs of amphibolites

表1 测试样品编号及采样位置

Table 1 The test sample number and sampling location

样品编号		岩性	构造	所在剖面位置	经纬度坐标
U-Pb01	GXW01	斜长角闪岩	块状构造	PM01	127°00'39″E;42°01'03″N;H=817
U-Pb01	GXW02	斜长角闪岩		PM01	127°00'41″E;42°00'54″N;H=823
U-Pb02	GXW03	斜长角闪岩		PM02	127°06'08″E;42°00'20″N;H=919
U-Pb02	GXW04	斜长角闪岩		PM02	127°06'07″E;42°00'21″N;H=921
U-Pb03	GXW05	斜长角闪岩	片麻状构造	PM17	127°33'24″E;42°05'35″N;H=888
U-Pb03	GXW06	斜长角闪岩	片麻状构造	PM17	127°33'24″E;42°05'33″N;H=885

图3 锆石年龄样品阴极发光图像

Fig.3 CL images of zircons

表2 斜长角闪岩LA-ICP-MS锆石U-Pb测年数据

Table 2 LA-ICP-MS zircon U-Pb data of amphibolites

测点号	含量/10^-6		$T h U$	同位素比值							年龄/Ma
测点号	Th	U	$T h U$	$? 207 P b ? 206 P b$	1σ	$? 207 P b ? 235 U$	1σ	$? 206 P b ? 238 U$	1σ		$? 207 P b ? 206 P b$	1σ	$? 207 P b ? 235 U$	1σ	$? 206 P b ? 238 U$	1σ
U-Pb01-01	388.0	414	0.94	0.173 4	0.001 0	11.243 9	0.124 9	0.468 1	0.004 5	2 591		14	2 544	10	2 475	20
U-Pb01-02	392.0	426	0.92	0.170 0	0.001 0	10.562 7	0.121 8	0.449 2	0.004 8	2 557		11	2 485	11	2 392	22
U-Pb01-03	179.0	343	0.52	0.167 6	0.001 3	11.434 0	0.117 4	0.493 4	0.004 5	2 600		14	2 559	10	2 586	20
U-Pb01-04	83.0	175	0.47	0.170 3	0.001 5	11.539 7	0.154 2	0.490 0	0.005 9	2 561		15	2 568	12	2 571	25
U-Pb01-05	216.0	251	0.86	0.165 2	0.001 3	10.688 3	0.153 1	0.468 8	0.007 3	2 510		13	2 496	13	2 478	32
U-Pb01-06	312.0	407	0.77	0.166 4	0.001 1	10.886 3	0.096 2	0.473 6	0.003 5	2 521		10	2 513	8	2 499	15
U-Pb01-07	320.0	543	0.59	0.168 8	0.001 3	9.374 7	0.133 7	0.402 6	0.006 4	2 545		13	2 375	13	2 181	29
U-Pb01-08	314.0	386	0.81	0.168 8	0.001 0	10.184 2	0.098 7	0.436 4	0.003 5	2 546		15	2 452	9	2 334	16
U-Pb01-09	260.0	333	0.78	0.174 0	0.001 0	11.424 1	0.132 9	0.473 7	0.004 6	2 596		10	2 558	11	2 500	20
U-Pb01-10	372.0	450	0.83	0.168 5	0.001 3	10.168 6	0.121 7	0.436 9	0.004 5	2 542		19	2 450	11	2 337	20
U-Pb01-11	391.0	452	0.87	0.173 5	0.001 1	10.816 0	0.165 0	0.450 2	0.005 6	2 592		11	2 507	14	2 396	25
U-Pb01-12	292.0	386	0.76	0.173 5	0.001 0	11.486 8	0.124 9	0.479 6	0.004 6	2 592		9	2 564	10	2 525	20
U-Pb01-13	129.0	292	0.44	0.166 6	0.001 0	10.734 7	0.111 8	0.466 6	0.004 5	2 523		44	2 500	10	2 469	20
U-Pb01-14	89.4	389	0.23	0.171 0	0.000 9	11.073 4	0.112 9	0.468 7	0.004 5	2 569		9	2 529	9	2 478	20
U-Pb01-15	157.0	372	0.42	0.169 2	0.000 9	10.910 5	0.128 6	0.466 4	0.005 1	2 549		9	2 516	11	2 468	22
U-Pb01-16	300.0	618	0.49	0.163 3	0.002 1	8.703 6	0.196 2	0.383 6	0.005 3	2 490		22	2 307	21	2 093	25
U-Pb01-17	75.7	134	0.57	0.160 2	0.001 1	9.613 6	0.105 8	0.432 9	0.003 8	2 458		11	2 398	10	2 319	17
U-Pb01-18	144.0	423	0.34	0.188 1	0.001 1	13.115 5	0.132 7	0.503 7	0.004 6	2 726		9	2 688	10	2 630	20
U-Pb01-19	243.0	361	0.67	0.163 6	0.001 0	9.980 6	0.135 7	0.440 6	0.005 5	2 494		10	2 433	13	2 353	25
U-Pb01-20	480.0	624	0.77	0.169 9	0.000 9	11.093 2	0.118 7	0.471 2	0.004 2	2 557		8	2 531	10	2 489	19
U-Pb01-21	639.0	118	0.54	0.141 0	0.001 0	3.739 2	0.042 6	0.191 1	0.001 4	2 240		13	1 580	9	1 128	8
U-Pb01-22	102.0	421	0.24	0.170 0	0.000 9	10.563 2	0.105 5	0.448 1	0.003 5	2 558		9	2 485	9	2 387	16
U-Pb01-23	144.0	381	0.38	0.167 9	0.001 1	10.426 3	0.096 8	0.448 4	0.003 2	2 536		11	2 473	9	2 388	14
U-Pb01-24	78.1	282	0.28	0.169 0	0.001 4	12.381 0	0.141 6	0.528 8	0.005 4	2 548		14	2 634	11	2 737	23
U-Pb01-25	91.6	273	0.34	0.166 8	0.001 2	10.633 8	0.146 9	0.460 1	0.006 0	2 526		13	2 492	13	2 440	26
U-Pb02-01	50.7	93	0.55	0.168 0	0.001 2	11.394 3	0.135 9	0.490 7	0.005 7	2 538		12	2 556	11	2 574	25
U-Pb02-02	145.0	177	0.82	0.053 9	0.001 9	0.302 6	0.010 0	0.040 8	0.000 6	365		80	268	8	258	3
U-Pb02-03	68.6	94	0.73	0.169 3	0.001 8	10.133 0	0.157 5	0.431 9	0.005 4	2 551		18	2 447	14	2 314	24
U-Pb02-04	54.1	77	0.70	0.169 3	0.001 2	10.818 2	0.122 7	0.461 3	0.004 4	2 550		12	2 508	11	2 445	19
U-Pb02-05	40.5	97	0.42	0.165 6	0.001 1	12.468 1	0.166 3	0.543 4	0.006 5	2 514		11	2 640	13	2 797	27
U-Pb02-06	62.0	87	0.71	0.160 9	0.001 6	10.211 4	0.154 0	0.457 3	0.005 2	2 465		17	2 454	14	2 428	23
U-Pb02-07	43.3	93	0.47	0.169 7	0.002 1	10.326 8	0.163 7	0.440 4	0.006 9	2 554		21	2 465	15	2 353	31
U-Pb02-08	59.1	70	0.85	0.164 8	0.001 3	10.655 8	0.138 9	0.466 8	0.005 2	2 506		14	2 494	12	2 470	23
U-Pb02-09	55.2	88	0.63	0.166 2	0.001 7	11.961 4	0.135 8	0.521 9	0.005 4	2 520		17	2 601	11	2 707	23
U-Pb02-10	122.0	155	0.78	0.166 5	0.001 2	9.940 5	0.145 3	0.431 3	0.005 9	2 524		6	2 429	13	2 312	27
U-Pb02-11	39.3	71	0.55	0.171 0	0.001 2	11.665 8	0.145 6	0.493 4	0.005 1	2 569		12	2 578	12	2 586	22
U-Pb02-12	47.7	73	0.66	0.160 8	0.001 8	8.681 8	0.154 7	0.391 3	0.006 7	2 465		14	2 305	16	2 129	31
U-Pb02-13	115.0	153	0.75	0.166 0	0.001 1	10.873 1	0.120 9	0.474 2	0.004 9	2 518		11	2 512	10	2 502	21
U-Pb02-14	115.0	296	0.39	0.156 6	0.001 1	9.675 6	0.171 6	0.445 9	0.006 5	2 420		11	2 404	16	2 377	29
U-Pb02-15	108.0	154	0.70	0.146 1	0.001 4	7.240 0	0.183 8	0.357 0	0.007 0	2 302		16	2 141	23	1 968	33
U-Pb02-16	48.0	70	0.68	0.166 2	0.001 3	10.598 4	0.104 7	0.463 6	0.004 2	2 520		14	2 489	9	2 455	18
U-Pb02-17	39.1	115	0.34	0.162 5	0.001 0	11.890 5	0.129 8	0.531 4	0.005 5	2 483		10	2 596	10	2 747	23
U-Pb02-18	102.0	241	0.42	0.165 2	0.000 9	11.803 3	0.152 3	0.517 7	0.005 9	2 510		9	2 589	12	2 689	25
U-Pb02-19	111.0	151	0.74	0.171 3	0.001 2	11.059 1	0.124 3	0.468 3	0.004 6	2 570		13	2 528	10	2 476	20
U-Pb02-20	242.0	231	1.05	0.169 5	0.001 0	10.164 9	0.123 8	0.435 1	0.005 3	2 554		10	2 450	11	2 329	24
U-Pb02-21	31.3	50	0.63	0.173 9	0.001 4	11.737 6	0.150 1	0.489 2	0.005 1	2 596		13	2 584	12	2 567	22
U-Pb02-22	161.0	152	1.06	0.171 2	0.001 1	11.425 0	0.098 7	0.483 7	0.003 4	2 569		10	2 558	8	2 543	15
U-Pb02-23	95.7	160	0.60	0.170 6	0.001 6	11.064 0	0.133 7	0.470 3	0.006 1	2 565		16	2 529	11	2 485	27
U-Pb02-24	68.5	115	0.59	0.164 9	0.001 2	10.973 8	0.117 8	0.483 3	0.005 5	2 507		13	2 521	10	2 541	24
U-Pb02-25	37.6	52	0.72	0.168 5	0.001 4	11.301 6	0.116 9	0.487 0	0.005 2	2 542		15	2 548	10	2 558	22
U-Pb03-01	22.7	40	0.57	0.168 5	0.001 5	11.406 9	0.141 9	0.490 0	0.004 6	2 542		15	2 557	12	2 571	20
U-Pb03-02	16.2	25	0.66	0.168 8	0.002 0	11.405 7	0.163 1	0.488 9	0.004 6	2 546		19	2 557	13	2 566	20
U-Pb03-03	15.1	33	0.46	0.171 4	0.001 8	11.534 0	0.164 6	0.486 6	0.005 1	2 571		17	2 567	13	2 556	22
U-Pb03-04	15.8	46	0.35	0.156 6	0.001 5	8.984 6	0.134 6	0.415 2	0.005 1	2 420		17	2 336	14	2 238	23
U-Pb03-05	16.9	26	0.65	0.166 7	0.001 8	11.167 1	0.166 6	0.484 3	0.004 9	2 524		18	2 537	14	2 546	21
U-Pb03-06	20.4	40	0.51	0.166 4	0.002 2	9.099 8	0.287 1	0.395 0	0.011 4	2 522		23	2 348	29	2 146	53
U-Pb03-07	11.4	22	0.51	0.168 5	0.002 3	10.785 4	0.164 8	0.464 2	0.004 7	2 543		23	2 505	14	2 458	21
U-Pb03-08	34.6	89	0.39	0.167 4	0.001 2	11.411 3	0.133 8	0.493 1	0.004 9	2 532		12	2 557	11	2 584	21
U-Pb03-09	17.0	36	0.47	0.167 4	0.001 6	11.788 6	0.167 7	0.510 2	0.006 2	2 532		16	2 588	13	2 658	26
U-Pb03-10	189.0	266	0.71	0.162 9	0.000 9	10.291 7	0.149 8	0.456 4	0.005 6	2 487		9	2 461	13	2 423	25
U-Pb03-11	18.9	41	0.46	0.164 9	0.001 6	11.071 1	0.184 8	0.487 3	0.007 6	2 506		12	2 529	16	2 559	33
U-Pb03-12	19.3	38	0.50	0.167 5	0.001 6	11.243 7	0.169 0	0.485 2	0.005 2	2 533		16	2 544	14	2 550	23
U-Pb03-13	87.9	133	0.66	0.167 3	0.001 2	11.112 6	0.130 1	0.480 9	0.004 8	2 531		11	2 533	11	2 531	21
U-Pb03-14	11.6	30	0.38	0.168 4	0.001 6	11.453 3	0.170 4	0.491 7	0.005 3	2 542		15	2 561	14	2 578	23
U-Pb03-15	14.2	31	0.46	0.169 0	0.001 8	11.367 1	0.167 3	0.487 2	0.004 8	2 547		17	2 554	14	2 558	21
U-Pb03-16	17.1	47	0.37	0.166 2	0.001 6	10.478 0	0.144 4	0.457 1	0.005 2	2 520		16	2 478	13	2 427	23
U-Pb03-17	199.0	399	0.50	0.169 1	0.000 9	10.305 8	0.116 4	0.441 2	0.004 8	2 550		9	2 463	10	2 356	21
U-Pb03-18	38.3	152	0.25	0.155 2	0.001 6	9.285 3	0.190 7	0.431 3	0.007 2	2 406		18	2 367	19	2 312	32
U-Pb03-19	305.0	681	0.45	0.151 7	0.001 5	6.073 1	0.093 8	0.289 2	0.003 5	2 365		18	1 986	13	1 637	18
U-Pb03-20	9.88	28	0.35	0.169 9	0.002 1	11.255 8	0.188 3	0.480 4	0.006 3	2 557		21	2 545	16	2 529	28
U-Pb03-21	75.8	101	0.75	0.168 0	0.001 2	12.045 2	0.169 0	0.518 4	0.006 2	2 539		11	2 608	13	2 692	26
U-Pb03-22	391.0	699	0.56	0.157 8	0.001 7	8.139 7	0.141 6	0.373 1	0.005 9	2 432		19	2 247	16	2 044	27
U-Pb03-23	49.7	108	0.46	0.164 6	0.001 2	11.653 6	0.155 0	0.512 1	0.004 8	2 503		13	2 577	12	2 666	21
U-Pb03-24	39.3	66	0.59	0.166 6	0.001 4	10.245 6	0.207 3	0.443 9	0.006 3	2 524		15	2 457	19	2 368	28
U-Pb03-25	25.1	48	0.53	0.168 9	0.002 5	11.228 6	0.242 1	0.481 3	0.006 0	2 547		25	2 542	20	2 533	26

表2 斜长角闪岩LA-ICP-MS锆石U-Pb测年数据

Table 2 LA-ICP-MS zircon U-Pb data of amphibolites

测点号	含量/10^-6		$T h U$	同位素比值							年龄/Ma
测点号	Th	U	$T h U$	$? 207 P b ? 206 P b$	1σ	$? 207 P b ? 235 U$	1σ	$? 206 P b ? 238 U$	1σ		$? 207 P b ? 206 P b$	1σ	$? 207 P b ? 235 U$	1σ	$? 206 P b ? 238 U$	1σ
U-Pb01-01	388.0	414	0.94	0.173 4	0.001 0	11.243 9	0.124 9	0.468 1	0.004 5	2 591		14	2 544	10	2 475	20
U-Pb01-02	392.0	426	0.92	0.170 0	0.001 0	10.562 7	0.121 8	0.449 2	0.004 8	2 557		11	2 485	11	2 392	22
U-Pb01-03	179.0	343	0.52	0.167 6	0.001 3	11.434 0	0.117 4	0.493 4	0.004 5	2 600		14	2 559	10	2 586	20
U-Pb01-04	83.0	175	0.47	0.170 3	0.001 5	11.539 7	0.154 2	0.490 0	0.005 9	2 561		15	2 568	12	2 571	25
U-Pb01-05	216.0	251	0.86	0.165 2	0.001 3	10.688 3	0.153 1	0.468 8	0.007 3	2 510		13	2 496	13	2 478	32
U-Pb01-06	312.0	407	0.77	0.166 4	0.001 1	10.886 3	0.096 2	0.473 6	0.003 5	2 521		10	2 513	8	2 499	15
U-Pb01-07	320.0	543	0.59	0.168 8	0.001 3	9.374 7	0.133 7	0.402 6	0.006 4	2 545		13	2 375	13	2 181	29
U-Pb01-08	314.0	386	0.81	0.168 8	0.001 0	10.184 2	0.098 7	0.436 4	0.003 5	2 546		15	2 452	9	2 334	16
U-Pb01-09	260.0	333	0.78	0.174 0	0.001 0	11.424 1	0.132 9	0.473 7	0.004 6	2 596		10	2 558	11	2 500	20
U-Pb01-10	372.0	450	0.83	0.168 5	0.001 3	10.168 6	0.121 7	0.436 9	0.004 5	2 542		19	2 450	11	2 337	20
U-Pb01-11	391.0	452	0.87	0.173 5	0.001 1	10.816 0	0.165 0	0.450 2	0.005 6	2 592		11	2 507	14	2 396	25
U-Pb01-12	292.0	386	0.76	0.173 5	0.001 0	11.486 8	0.124 9	0.479 6	0.004 6	2 592		9	2 564	10	2 525	20
U-Pb01-13	129.0	292	0.44	0.166 6	0.001 0	10.734 7	0.111 8	0.466 6	0.004 5	2 523		44	2 500	10	2 469	20
U-Pb01-14	89.4	389	0.23	0.171 0	0.000 9	11.073 4	0.112 9	0.468 7	0.004 5	2 569		9	2 529	9	2 478	20
U-Pb01-15	157.0	372	0.42	0.169 2	0.000 9	10.910 5	0.128 6	0.466 4	0.005 1	2 549		9	2 516	11	2 468	22
U-Pb01-16	300.0	618	0.49	0.163 3	0.002 1	8.703 6	0.196 2	0.383 6	0.005 3	2 490		22	2 307	21	2 093	25
U-Pb01-17	75.7	134	0.57	0.160 2	0.001 1	9.613 6	0.105 8	0.432 9	0.003 8	2 458		11	2 398	10	2 319	17
U-Pb01-18	144.0	423	0.34	0.188 1	0.001 1	13.115 5	0.132 7	0.503 7	0.004 6	2 726		9	2 688	10	2 630	20
U-Pb01-19	243.0	361	0.67	0.163 6	0.001 0	9.980 6	0.135 7	0.440 6	0.005 5	2 494		10	2 433	13	2 353	25
U-Pb01-20	480.0	624	0.77	0.169 9	0.000 9	11.093 2	0.118 7	0.471 2	0.004 2	2 557		8	2 531	10	2 489	19
U-Pb01-21	639.0	118	0.54	0.141 0	0.001 0	3.739 2	0.042 6	0.191 1	0.001 4	2 240		13	1 580	9	1 128	8
U-Pb01-22	102.0	421	0.24	0.170 0	0.000 9	10.563 2	0.105 5	0.448 1	0.003 5	2 558		9	2 485	9	2 387	16
U-Pb01-23	144.0	381	0.38	0.167 9	0.001 1	10.426 3	0.096 8	0.448 4	0.003 2	2 536		11	2 473	9	2 388	14
U-Pb01-24	78.1	282	0.28	0.169 0	0.001 4	12.381 0	0.141 6	0.528 8	0.005 4	2 548		14	2 634	11	2 737	23
U-Pb01-25	91.6	273	0.34	0.166 8	0.001 2	10.633 8	0.146 9	0.460 1	0.006 0	2 526		13	2 492	13	2 440	26
U-Pb02-01	50.7	93	0.55	0.168 0	0.001 2	11.394 3	0.135 9	0.490 7	0.005 7	2 538		12	2 556	11	2 574	25
U-Pb02-02	145.0	177	0.82	0.053 9	0.001 9	0.302 6	0.010 0	0.040 8	0.000 6	365		80	268	8	258	3
U-Pb02-03	68.6	94	0.73	0.169 3	0.001 8	10.133 0	0.157 5	0.431 9	0.005 4	2 551		18	2 447	14	2 314	24
U-Pb02-04	54.1	77	0.70	0.169 3	0.001 2	10.818 2	0.122 7	0.461 3	0.004 4	2 550		12	2 508	11	2 445	19
U-Pb02-05	40.5	97	0.42	0.165 6	0.001 1	12.468 1	0.166 3	0.543 4	0.006 5	2 514		11	2 640	13	2 797	27
U-Pb02-06	62.0	87	0.71	0.160 9	0.001 6	10.211 4	0.154 0	0.457 3	0.005 2	2 465		17	2 454	14	2 428	23
U-Pb02-07	43.3	93	0.47	0.169 7	0.002 1	10.326 8	0.163 7	0.440 4	0.006 9	2 554		21	2 465	15	2 353	31
U-Pb02-08	59.1	70	0.85	0.164 8	0.001 3	10.655 8	0.138 9	0.466 8	0.005 2	2 506		14	2 494	12	2 470	23
U-Pb02-09	55.2	88	0.63	0.166 2	0.001 7	11.961 4	0.135 8	0.521 9	0.005 4	2 520		17	2 601	11	2 707	23
U-Pb02-10	122.0	155	0.78	0.166 5	0.001 2	9.940 5	0.145 3	0.431 3	0.005 9	2 524		6	2 429	13	2 312	27
U-Pb02-11	39.3	71	0.55	0.171 0	0.001 2	11.665 8	0.145 6	0.493 4	0.005 1	2 569		12	2 578	12	2 586	22
U-Pb02-12	47.7	73	0.66	0.160 8	0.001 8	8.681 8	0.154 7	0.391 3	0.006 7	2 465		14	2 305	16	2 129	31
U-Pb02-13	115.0	153	0.75	0.166 0	0.001 1	10.873 1	0.120 9	0.474 2	0.004 9	2 518		11	2 512	10	2 502	21
U-Pb02-14	115.0	296	0.39	0.156 6	0.001 1	9.675 6	0.171 6	0.445 9	0.006 5	2 420		11	2 404	16	2 377	29
U-Pb02-15	108.0	154	0.70	0.146 1	0.001 4	7.240 0	0.183 8	0.357 0	0.007 0	2 302		16	2 141	23	1 968	33
U-Pb02-16	48.0	70	0.68	0.166 2	0.001 3	10.598 4	0.104 7	0.463 6	0.004 2	2 520		14	2 489	9	2 455	18
U-Pb02-17	39.1	115	0.34	0.162 5	0.001 0	11.890 5	0.129 8	0.531 4	0.005 5	2 483		10	2 596	10	2 747	23
U-Pb02-18	102.0	241	0.42	0.165 2	0.000 9	11.803 3	0.152 3	0.517 7	0.005 9	2 510		9	2 589	12	2 689	25
U-Pb02-19	111.0	151	0.74	0.171 3	0.001 2	11.059 1	0.124 3	0.468 3	0.004 6	2 570		13	2 528	10	2 476	20
U-Pb02-20	242.0	231	1.05	0.169 5	0.001 0	10.164 9	0.123 8	0.435 1	0.005 3	2 554		10	2 450	11	2 329	24
U-Pb02-21	31.3	50	0.63	0.173 9	0.001 4	11.737 6	0.150 1	0.489 2	0.005 1	2 596		13	2 584	12	2 567	22
U-Pb02-22	161.0	152	1.06	0.171 2	0.001 1	11.425 0	0.098 7	0.483 7	0.003 4	2 569		10	2 558	8	2 543	15
U-Pb02-23	95.7	160	0.60	0.170 6	0.001 6	11.064 0	0.133 7	0.470 3	0.006 1	2 565		16	2 529	11	2 485	27
U-Pb02-24	68.5	115	0.59	0.164 9	0.001 2	10.973 8	0.117 8	0.483 3	0.005 5	2 507		13	2 521	10	2 541	24
U-Pb02-25	37.6	52	0.72	0.168 5	0.001 4	11.301 6	0.116 9	0.487 0	0.005 2	2 542		15	2 548	10	2 558	22
U-Pb03-01	22.7	40	0.57	0.168 5	0.001 5	11.406 9	0.141 9	0.490 0	0.004 6	2 542		15	2 557	12	2 571	20
U-Pb03-02	16.2	25	0.66	0.168 8	0.002 0	11.405 7	0.163 1	0.488 9	0.004 6	2 546		19	2 557	13	2 566	20
U-Pb03-03	15.1	33	0.46	0.171 4	0.001 8	11.534 0	0.164 6	0.486 6	0.005 1	2 571		17	2 567	13	2 556	22
U-Pb03-04	15.8	46	0.35	0.156 6	0.001 5	8.984 6	0.134 6	0.415 2	0.005 1	2 420		17	2 336	14	2 238	23
U-Pb03-05	16.9	26	0.65	0.166 7	0.001 8	11.167 1	0.166 6	0.484 3	0.004 9	2 524		18	2 537	14	2 546	21
U-Pb03-06	20.4	40	0.51	0.166 4	0.002 2	9.099 8	0.287 1	0.395 0	0.011 4	2 522		23	2 348	29	2 146	53
U-Pb03-07	11.4	22	0.51	0.168 5	0.002 3	10.785 4	0.164 8	0.464 2	0.004 7	2 543		23	2 505	14	2 458	21
U-Pb03-08	34.6	89	0.39	0.167 4	0.001 2	11.411 3	0.133 8	0.493 1	0.004 9	2 532		12	2 557	11	2 584	21
U-Pb03-09	17.0	36	0.47	0.167 4	0.001 6	11.788 6	0.167 7	0.510 2	0.006 2	2 532		16	2 588	13	2 658	26
U-Pb03-10	189.0	266	0.71	0.162 9	0.000 9	10.291 7	0.149 8	0.456 4	0.005 6	2 487		9	2 461	13	2 423	25
U-Pb03-11	18.9	41	0.46	0.164 9	0.001 6	11.071 1	0.184 8	0.487 3	0.007 6	2 506		12	2 529	16	2 559	33
U-Pb03-12	19.3	38	0.50	0.167 5	0.001 6	11.243 7	0.169 0	0.485 2	0.005 2	2 533		16	2 544	14	2 550	23
U-Pb03-13	87.9	133	0.66	0.167 3	0.001 2	11.112 6	0.130 1	0.480 9	0.004 8	2 531		11	2 533	11	2 531	21
U-Pb03-14	11.6	30	0.38	0.168 4	0.001 6	11.453 3	0.170 4	0.491 7	0.005 3	2 542		15	2 561	14	2 578	23
U-Pb03-15	14.2	31	0.46	0.169 0	0.001 8	11.367 1	0.167 3	0.487 2	0.004 8	2 547		17	2 554	14	2 558	21
U-Pb03-16	17.1	47	0.37	0.166 2	0.001 6	10.478 0	0.144 4	0.457 1	0.005 2	2 520		16	2 478	13	2 427	23
U-Pb03-17	199.0	399	0.50	0.169 1	0.000 9	10.305 8	0.116 4	0.441 2	0.004 8	2 550		9	2 463	10	2 356	21
U-Pb03-18	38.3	152	0.25	0.155 2	0.001 6	9.285 3	0.190 7	0.431 3	0.007 2	2 406		18	2 367	19	2 312	32
U-Pb03-19	305.0	681	0.45	0.151 7	0.001 5	6.073 1	0.093 8	0.289 2	0.003 5	2 365		18	1 986	13	1 637	18
U-Pb03-20	9.88	28	0.35	0.169 9	0.002 1	11.255 8	0.188 3	0.480 4	0.006 3	2 557		21	2 545	16	2 529	28
U-Pb03-21	75.8	101	0.75	0.168 0	0.001 2	12.045 2	0.169 0	0.518 4	0.006 2	2 539		11	2 608	13	2 692	26
U-Pb03-22	391.0	699	0.56	0.157 8	0.001 7	8.139 7	0.141 6	0.373 1	0.005 9	2 432		19	2 247	16	2 044	27
U-Pb03-23	49.7	108	0.46	0.164 6	0.001 2	11.653 6	0.155 0	0.512 1	0.004 8	2 503		13	2 577	12	2 666	21
U-Pb03-24	39.3	66	0.59	0.166 6	0.001 4	10.245 6	0.207 3	0.443 9	0.006 3	2 524		15	2 457	19	2 368	28
U-Pb03-25	25.1	48	0.53	0.168 9	0.002 5	11.228 6	0.242 1	0.481 3	0.006 0	2 547		25	2 542	20	2 533	26

图4 锆石样品U-Pb年龄谐和图 (a)U-Pb01样品谐和图;(b)U-Pb02样品谐和图;(c)U-Pb03样品谐和图

Fig.4 U-Pb concordia diagrams of zircon samples

表3 斜长角闪岩常量元素(wB/%)及稀土、微量元素(wB/10-6)组成

Table 3 Major(%),REE and trace elements (10-6) of amphibolites

样品编号	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO	MgO		CaO		Na₂O		K₂O	P₂O₅		烧失量	总量
GXW01	46.22	1.37	11.99	6.24	8.72	0.21	10.94		8.96		1.45		1.23	0.12		3.16	100.61
GXW02	53.61	2.16	13.28	11.48	5.10	0.15	3.29		2.47		3.02		1.42	0.40		4.59	100.97
GXW03	49.07	1.25	11.84	5.46	6.71	0.19	10.44		8.96		2.09		1.65	0.11		2.59	100.36
GXW04	47.99	1.57	17.59	5.48	5.58	0.15	5.57		7.49		3.30		1.73	0.29		3.62	100.36
GXW05	59.60	0.40	11.83	3.37	4.37	0.14	5.51		6.22		3.51		1.26	0.08		3.89	100.18
GXW06	50.32	0.57	14.01	5.82	6.96	0.17	8.56		4.98		2.79		1.10	0.07		5.15	100.49
样品编号	A/CNK	Mg^#	La	Ce	Pr	Nd	Sm		Eu		Gd		Tb	Dy		Ho	Er
GXW01	0.599	49.18	20.4	24.3	5.62	23.0	5.64		1.85		5.32		0.96	4.94		1.00	2.57
GXW02	1.208	33.22	45.3	77.7	11.00	45.8	9.95		2.95		8.68		1.47	6.96		1.36	3.47
GXW03	0.550	54.54	16.1	27.3	4.33	18.3	4.39		1.32		3.87		0.69	3.36		0.70	1.70
GXW04	0.841	43.50	30.6	59.4	7.73	31.1	7.07		2.23		6.29		1.09	5.52		1.18	3.10
GXW05	0.641	49.30	10.7	29.9	4.67	21.4	5.72		1.13		4.85		0.93	5.23		1.08	3.04
GXW06	0.944	48.68	7.46	17.4	2.55	10.8	2.81		0.94		2.54		0.53	3.11		0.69	1.88
样品编号	Tm	Yb	Lu	δEu	δCe	(La /Yb)_N		ΣREE		LREE		HREE			LREE /HREE		Cs
GXW01	0.42	2.65	0.35	1.02	0.53	5.20		99.03		80.81		18.22			4.44		0.54
GXW02	0.56	3.41	0.46	0.95	0.80	8.98		219.07		192.70		26.37			7.31		0.78
GXW03	0.27	1.66	0.24	0.96	0.76	6.55		84.23		71.74		12.49			5.74		0.75
GXW04	0.54	3.33	0.50	1.00	0.89	6.21		159.68		138.13		21.55			6.41		0.73
GXW05	0.54	3.49	0.50	0.64	0.99	2.07		93.18		73.52		19.66			3.74		1.64
GXW06	0.34	2.35	0.33	1.05	0.93	2.15		53.74		41.96		11.78			3.56		2.06
样品编号	Rb	Ba	Th	U	Zr	Hf	Sr		Y		Nb		Ta	Ga		Cr	V
GXW01	60.7	415	2.48	0.375	34.4	1.42	182		28.3		4.60		0.344	20.9		823	331
GXW02	54.5	689	3.59	0.481	27.9	1.40	312		36.6		11.70		0.735	26.3		7	348
GXW03	52.3	427	2.33	0.382	13.5	0.75	274		17.8		7.30		0.446	17.6		716	250
GXW04	47.2	557	6.98	1.620	201.0	5.57	775		31.2		11.90		0.807	21.2		18	272
GXW05	46.7	186	7.93	2.480	28.9	1.56	235		31.1		9.64		1.150	18.4		214	166
GXW06	53.0	302	1.63	1.620	19.0	0.87	249		20.4		5.71		0.703	18.8		127	211

表3 斜长角闪岩常量元素(wB/%)及稀土、微量元素(wB/10-6)组成

Table 3 Major(%),REE and trace elements (10-6) of amphibolites

样品编号	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO	MgO		CaO		Na₂O		K₂O	P₂O₅		烧失量	总量
GXW01	46.22	1.37	11.99	6.24	8.72	0.21	10.94		8.96		1.45		1.23	0.12		3.16	100.61
GXW02	53.61	2.16	13.28	11.48	5.10	0.15	3.29		2.47		3.02		1.42	0.40		4.59	100.97
GXW03	49.07	1.25	11.84	5.46	6.71	0.19	10.44		8.96		2.09		1.65	0.11		2.59	100.36
GXW04	47.99	1.57	17.59	5.48	5.58	0.15	5.57		7.49		3.30		1.73	0.29		3.62	100.36
GXW05	59.60	0.40	11.83	3.37	4.37	0.14	5.51		6.22		3.51		1.26	0.08		3.89	100.18
GXW06	50.32	0.57	14.01	5.82	6.96	0.17	8.56		4.98		2.79		1.10	0.07		5.15	100.49
样品编号	A/CNK	Mg^#	La	Ce	Pr	Nd	Sm		Eu		Gd		Tb	Dy		Ho	Er
GXW01	0.599	49.18	20.4	24.3	5.62	23.0	5.64		1.85		5.32		0.96	4.94		1.00	2.57
GXW02	1.208	33.22	45.3	77.7	11.00	45.8	9.95		2.95		8.68		1.47	6.96		1.36	3.47
GXW03	0.550	54.54	16.1	27.3	4.33	18.3	4.39		1.32		3.87		0.69	3.36		0.70	1.70
GXW04	0.841	43.50	30.6	59.4	7.73	31.1	7.07		2.23		6.29		1.09	5.52		1.18	3.10
GXW05	0.641	49.30	10.7	29.9	4.67	21.4	5.72		1.13		4.85		0.93	5.23		1.08	3.04
GXW06	0.944	48.68	7.46	17.4	2.55	10.8	2.81		0.94		2.54		0.53	3.11		0.69	1.88
样品编号	Tm	Yb	Lu	δEu	δCe	(La /Yb)_N		ΣREE		LREE		HREE			LREE /HREE		Cs
GXW01	0.42	2.65	0.35	1.02	0.53	5.20		99.03		80.81		18.22			4.44		0.54
GXW02	0.56	3.41	0.46	0.95	0.80	8.98		219.07		192.70		26.37			7.31		0.78
GXW03	0.27	1.66	0.24	0.96	0.76	6.55		84.23		71.74		12.49			5.74		0.75
GXW04	0.54	3.33	0.50	1.00	0.89	6.21		159.68		138.13		21.55			6.41		0.73
GXW05	0.54	3.49	0.50	0.64	0.99	2.07		93.18		73.52		19.66			3.74		1.64
GXW06	0.34	2.35	0.33	1.05	0.93	2.15		53.74		41.96		11.78			3.56		2.06
样品编号	Rb	Ba	Th	U	Zr	Hf	Sr		Y		Nb		Ta	Ga		Cr	V
GXW01	60.7	415	2.48	0.375	34.4	1.42	182		28.3		4.60		0.344	20.9		823	331
GXW02	54.5	689	3.59	0.481	27.9	1.40	312		36.6		11.70		0.735	26.3		7	348
GXW03	52.3	427	2.33	0.382	13.5	0.75	274		17.8		7.30		0.446	17.6		716	250
GXW04	47.2	557	6.98	1.620	201.0	5.57	775		31.2		11.90		0.807	21.2		18	272
GXW05	46.7	186	7.93	2.480	28.9	1.56	235		31.1		9.64		1.150	18.4		214	166
GXW06	53.0	302	1.63	1.620	19.0	0.87	249		20.4		5.71		0.703	18.8		127	211

图5 斜长角闪岩球粒陨石标准化REE配分图(a.标准化值据BOYNTON[18])和原始地幔标准化微量元素蛛网图(b.标准化值据SUN等[19])

Fig.5 Chondrite-normalized REE patterns(a.normalization values after BOYNTON[18]) and primitive mantle-normalized trace element patterns(b.normalization vslues after SUN et al.[19])of amphibolites

图6 斜长角闪岩原岩恢复图解(a.底图据VAN等[20];b.底图据王仁民等[21];c.据SIMONEN[22])

Fig.6 Protolith reconstruction diagrams of amphibolites(a.base map after VAN et al.[19];b.base map after Wang Renming et al.[20];c.base map after SIMONEN[21])

图7 斜长角闪岩P2O5-TiO2与MgO/FeO*-Y关系图解(据欧阳建平[36])

Fig.7 P2O5-TiO2 and MgO/FeO*-Y relationship diagram of amphibolites(after OU YANG[36])

图8 斜长角闪岩原岩构造判别图解(底图:(a)据COWDIE[37];(b)据WOOD[41];(c)据PEARCE[42];(d)据CONDIE[43]) WPB.板内玄武岩;MORB.大洋中脊玄武岩(N、T、E分别代表亏损型、过渡型、富集型);ARCB.弧玄武岩;CAB.岛弧钙碱性玄武岩;IAT.岛弧拉斑玄武岩; CABC.大陆边缘弧钙碱性玄武岩;WPAB.板内碱性玄武岩;WPT.板内拉斑玄武岩;VAB.火山弧玄武岩;SHO.钾玄岩;TH.拉斑型;TR.过渡型;ALK.碱性玄武岩

Fig.8 Tectonic discrimination diagrams of protoliths of amphibolites((a)base map after COWDIE[37];(b)base map after WOOD[41];(c)base map after PEARCE[42];(d)base map after CONDIE[43])

表4 玄武岩分类及斜长角闪岩参数

Table 4 Basalt classification screens and amphibolite parameters

样品	第一级划分											样品		第二级划分
	优先参数				其次参数									第二级划分
	Nb/La	Hf/Ta	La/Ta	Ti/Y	Ti/V	TiO₂/%		Ta/10^-6		Nb/10^-6				Hf/Th		Ce/Nb
WPB-MORB	>1	<5	≤15	≥350	>30	>1.25		>0.7		>12		WPB,T-EMORB		<8		≤2
ARCB-NMORB	≤1	≥5	>15	<350	≤30	≤1.25		≤0.7		≤12		NMORB		≥8		>2
GXW01	0.23	4.13	59.30	290.22	24.81	1.37		0.34		4.60		GXW01
GXW02	0.26	1.90	61.63	353.80	37.21	2.16		0.74		11.70		GXW02
GXW03	0.45	1.67	36.10	421.00	29.98	1.25		0.45		7.30		GXW03
GXW04	0.39	6.90	37.92	301.67	34.60	1.57		0.81		11.90		GXW04
GXW05	0.90	1.36	9.30	77.49	14.52	0.40		1.15		9.64		GXW05
GXW06	0.77	1.24	10.61	166.63	16.11	0.57		0.70		5.71		GXW06
样品	第三级划分				样品		第四级划分				样品		第五级划分
样品	Th/Yb	Th/Nb	Nb/La	Hf/Th	样品		Zr/Y		Ta/Yb		样品		Th/Yb		Ti/Zr		La/Ta
NMORB	≤0.1	≤0.07	>0.8	≥8	IAT-CAB		<3		≤0.1		IAT		≤0.3		≥85		>50
ARCB	>0.1	>0.07	≤0.8	<8	CABC		≥3		>0.1		CAB		>0.3		<85		≤50
GXW01	0.94	0.54	0.23	0.57	GXW01		1.22		0.13		GXW01		0.94		238.75		59.30
GXW02	1.05	0.31	0.26	0.39	GXW02		0.76		0.22		GXW02		1.05		464.13		61.63
GXW03	1.40	0.32	0.45	0.32	GXW03		0.76		0.27		GXW03		1.40		555.09		36.10
GXW04	2.10	0.59	0.39	0.80	GXW04		6.44		0.24		GXW04		2.10		46.83		37.92
GXW05	2.27	0.82	0.90	0.20	GXW05		0.93		0.33		GXW05		2.27		83.39		9.30
GXW06	0.69	0.29	0.77	0.54	GXW06		0.93		0.30		GXW06		0.69		178.90		10.61

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