琼东南晚二叠世I型花岗岩成因及其构造指示

赵国锋; 刘汇川; 钱鑫; 张爱梅; 何景文; 何慧莹; 王岳军

doi:10.3799/dqkx.2018.723

琼东南晚二叠世I型花岗岩成因及其构造指示

doi: 10.3799/dqkx.2018.723

1.
广东省地球动力作用与地质灾害重点实验室, 中山大学地球科学与工程学院, 广东广州 510275
2.
国家海洋局第三海洋研究所, 福建厦门 361005

基金项目:

国家自然科学基金项目 41702230

国家自然科学基金项目 41506050

重点研发计划项目 2014CB440901

国家自然科学基金项目 U1701641

重点研发计划项目 2016YFC0600303

博士后面上基金项目 2017M612794

详细信息

作者简介:
赵国锋(1992-), 男, 硕士研究生, 主要从事岩石大地构造研究

通讯作者:
刘汇川

中图分类号: P548
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- PDF下载量: 45
- 被引次数: 0
出版历程
- 收稿日期: 2017-11-24
- 刊出日期: 2018-04-15

Petrogenesis of Late Permian I-Type Granites in SE Hainan Island and Its Tectonic Implication for Paleotethyan Evolution

1.
Guangdong Provincial Key Laboratory of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China
2.
Third Institute of Oceanographyh, State Oceanic Administration, Xiamen 361005, China

摘要

摘要: 海南岛地处东古特提斯构造域东缘，是研究古特提斯东缘演化的重要地区.对海南岛东南部长征和陵水花岗闪长岩的LA-ICP-MS锆石U-Pb定年结果显示两者的结晶年龄分别为251±2 Ma和256±1 Ma，指示其形成于晚二叠世.样品的K₂O/Na₂O比值较低（0.2~0.9），铝饱和指数（A/CNK）为0.74~0.96，FeO^T/MgO约为0.90，CIPW计算结果中标准矿物刚玉分子含量0.00~0.18%，小于1%，岩石薄片镜下可见大量角闪石，而未见白云母、堇青石和石榴子石，并具有相对负的ε_Nd（t）值（-6.0~-3.2）和锆石原位ε_Hf（t）值（-4.4~+0.2），属于准铝质钙碱性I型花岗岩.长征和陵水花岗闪长岩源岩为亚碱性变基性岩，其形成与金沙江-哀牢山-松马-邦溪-晨星古特提斯弧后盆地的闭合有关.
- 海南岛 /
- 古特提斯演化 /
- I型花岗岩 /
- 晚二叠世 /
- 印支运动 /
- 岩石学
Abstract: Hainan Island is located in the convergence zone of the Pacific and Tethys tectonic domains and is a key area for investigating the Pacific and Tethyan evolution of the Indochina and South China blocks. In this paper, a set of new zircon U-Pb and Lu-Hf isotopic data, along with whole-rock elemental and Sr-Nd isotopic analytical results for the Changzheng and Lingshui granitoid plutons in Southeast Hainan Island are presented. The Changzheng and Lingshui granodiorites yield Late Permian LA-ICP-MS zircon U-Pb ages of 251±2 Ma and 256±1 Ma, respectively. They show K₂O/Na₂O=0.2-0.9, FeO^T/MgO ratios of 0.90, A/CNK=0.74-0.96 with 0.00-0.18% corundum. Their ε_Nd(t) values range from -6.0 to -3.2 and in-situ zircon ε_Hf(t) values from -4.4 to +0.2. Such signatures, in combination with the absence of muscovite, cordierite and garnet, suggest that these Late Permian granodiorites are I-type granites. The Changzheng and Lingshui granites were derived from the subalkaline metabasites in response to the closure of the Jinshajiang-Ailaoshan-Songma-Bangxi-Chenxing branch/back-arc basin during Paleotethyan evolution.
- Hainan Island /
- Paleotethyan evolution /
- I-type granite /
- Late Permian /
- Indosinian orogeny /
- petrology

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图 1 华南南缘大地构造简图(a)和研究区地质图及采样点(b)

图a和b均改编自Zhang et al.(2011)和He et al.(2017)

Fig. 1. Geological sketch in southern South China (a) and geological sketch of the study area showing the sampling locations (b)

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图 2 琼东南晚二叠世花岗质岩石的花岗岩手标本(a)和镜下照片(b)

Bt.黑云母；Pl.斜长石；Qtz.石英；Hb.角闪石

Fig. 2. Photographs (a) and microsraph (b) of the Late Permian granites in SE Hainan Island

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图 3 琼东南晚二叠世花岗质岩石的锆石U-Pb定年谐和图与锆石CL图像

Fig. 3. U-Pb concordia diagrams and cathodoluminescence images for the Late Permian granites in SE Hainan Island

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图 4 琼东南晚二叠世花岗质岩石的锆石ε_Hf(t)和T_DM2与成岩时间关系图解

亏损地幔演化线的数据来自文献Nowell et al.(1998)，平均地壳组分数据参考文献Griffin et al.(2004)；其中黑色菱形为本文数据，空心圆温淑女(2013)

Fig. 4. ε_Hf(t)-age and T_DM2-age for the Late Permian granites in SE Hainan Island

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图 5 琼东南晚二叠世花岗质岩石的QAP(a)和A/NK-A/CNK图解(b)

图a据Streckeisen(1976)；图b中黑色菱形为本文数据，空心圆温淑女(2013)；A/CNK=Al₂O₃/101.9/(CaO/56.1+Na₂O/62.0+K₂O/94.2)，A/NK=Al₂O₃/101.9/(Na₂O/62.0+K₂O/94.2)

Fig. 5. QAP (a) and A/NK-A/CNK (b) for the Late Permian granites in SE Hainan Island

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图 6 琼东南晚二叠世花岗质岩石的微量元素蛛网图(a)和稀土元素配分图(b)

原始地幔和球粒陨石数据来自文献Sun and McDonough(1989)

Fig. 6. Primitive mantle-normalized spidergram (a) and chondrite-normalized REE pattern (b) for the Late Permian granites in SE Hainan Island

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图 7 琼东南晚二叠世花岗质岩石的(⁸⁷Sr/⁸⁶Sr)_t-ε_Nd(t)关系

蛇绿岩数据来自文献Xu and Castillo(2004)，岛弧玄武岩数据来自文献Fan et al.(2010)，Lachlan褶皱带I型和S型花岗岩范围参考文献Healy et al.(2004)；其中黑色菱形为本文数据，空心圆温淑女(2013)

Fig. 7. Relation of (⁸⁷Sr/⁸⁶Sr)_t-ε_Nd(t) for the Late Permian granites in SE Hainan Island

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图 8 琼东南晚二叠世花岗质岩石的构造判别图

WPG.板内花岗岩；VAG.火山弧型花岗岩；ORG.洋脊型花岗岩；syn-COLG.同碰撞型花岗岩.图据Pearce et al.(1984)和Pearce(1996)

Fig. 8. Discrimination diagrams for the Late Permian granites in SE Hainan Island

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表 1 LA-ICP-MS锆石U-Pb定年结果

Table 1. U-Pb zircon LA-ICP-MS chronological data

测试点	Th/U	²⁰⁷Pb/²⁰⁶Pb	2σ	²⁰⁷Pb/²³⁵U	2σ	²⁰⁶Pb/²³⁸U	2σ	年龄(Ma)
测试点	Th/U	²⁰⁷Pb/²⁰⁶Pb	2σ	²⁰⁷Pb/²³⁵U	2σ	²⁰⁶Pb/²³⁸U	2σ	²⁰⁷Pb/²⁰⁶Pb	2σ	²⁰⁷Pb/²³⁵U	2σ	²⁰⁶Pb/²³⁸U	2σ
11SY-27
1	0.17	0.051 440	0.001 407	0.280 506	0.008 618	0.039 538	0.001 197	261	61	251	7	250	7
2	0.30	0.051 333	0.001 396	0.288 401	0.008 842	0.040 752	0.001 248	257	63	257	7	257	8
3	0.05	0.051 398	0.001 397	0.280 870	0.008 493	0.039 632	0.001 193	257	63	251	7	251	7
4	0.08	0.051 520	0.001 400	0.281 793	0.008 375	0.039 680	0.001 182	265	56	252	7	251	7
5	0.05	0.051 298	0.001 393	0.278 147	0.008 387	0.039 331	0.001 186	254	66	249	7	249	7
6	0.04	0.051 186	0.001 391	0.275 832	0.008 346	0.039 076	0.001 171	250	61	247	7	247	7
7	0.05	0.051 136	0.001 390	0.277 604	0.008 429	0.039 386	0.001 198	256	63	249	7	249	7
8	0.07	0.051 175	0.001 392	0.276 996	0.008 164	0.039 262	0.001 153	256	63	248	6	248	7
9	0.04	0.051 320	0.001 395	0.274 561	0.008 086	0.038 803	0.001 138	254	63	246	6	245	7
10	0.03	0.052 095	0.001 443	0.280 181	0.008 541	0.038 966	0.001 131	300	58	251	7	246	7
11	0.07	0.051 237	0.001 395	0.287 575	0.009 472	0.040 699	0.001 327	250	68	257	7	257	8
12	0.47	0.051 144	0.001 395	0.274 733	0.008 015	0.038 956	0.001 122	256	63	246	6	246	7
13	0.09	0.051 433	0.001 403	0.283 303	0.008 549	0.039 963	0.001 202	261	63	253	7	253	7
14	0.12	0.051 529	0.001 404	0.283 845	0.008 881	0.039 956	0.001 243	265	56	254	7	253	8
15	0.36	0.051 440	0.001 397	0.270 501	0.007 999	0.038 141	0.001 122	261	61	243	6	241	7
16	0.22	0.051 430	0.001 398	0.284 915	0.008 730	0.040 185	0.001 227	261	61	255	7	254	8
17	0.31	0.051 344	0.001 396	0.278 219	0.008 260	0.039 310	0.001 165	257	63	249	7	249	7
18	0.27	0.051 733	0.001 408	0.277 636	0.008 183	0.038 938	0.001 149	272	68	249	7	246	7
19	0.20	0.051 345	0.001 399	0.288 298	0.008 659	0.040 729	0.001 216	257	63	257	7	257	8
20	0.15	0.052 096	0.001 433	0.290 311	0.008 505	0.040 480	0.001 211	300	58	259	7	256	8
21	0.22	0.051 193	0.001 390	0.284 289	0.008 662	0.040 285	0.001 227	250	61	254	7	255	8
22	0.24	0.051 311	0.001 397	0.290 515	0.009 456	0.041 061	0.001 325	254	63	259	7	259	8
23	0.07	0.051 267	0.001 392	0.276 389	0.008 186	0.039 102	0.001 153	254	66	248	7	247	7
24	0.21	0.051 361	0.001 397	0.281 762	0.008 413	0.039 798	0.001 187	257	61	252	7	252	7
25	0.25	0.051 295	0.001 395	0.285 932	0.008 611	0.040 442	0.001 219	254	66	255	7	256	8
11SY-28
1	0.06	0.053 255	0.000 550	0.298 426	0.005 658	0.040 525	0.000 458	339	22	265	4	256	3
2	0.03	0.051 511	0.000 177	0.286 285	0.003 263	0.040 291	0.000 438	265	7	256	3	255	3
3	0.10	0.051 629	0.000 202	0.287 987	0.003 525	0.040 440	0.000 474	333	9	257	3	256	3
4	0.20	0.051 519	0.000 197	0.288 171	0.004 004	0.040 551	0.000 541	265	9	257	3	256	3
5	0.16	0.052 306	0.000 473	0.292 485	0.005 016	0.040 570	0.000 639	298	20	261	4	256	4
6	0.07	0.051 123	0.000 139	0.285 371	0.003 155	0.040 474	0.000 451	256	7	255	2	256	3
7	0.07	0.051 242	0.000 193	0.286 273	0.004 246	0.040 503	0.000 586	250	9	256	3	256	4
8	0.33	0.051 256	0.000 219	0.285 813	0.003 749	0.040 422	0.000 501	254	9	255	3	255	3
9	0.29	0.051 528	0.000 290	0.287 713	0.004 923	0.040 489	0.000 670	265	13	257	4	256	4
10	0.30	0.051 635	0.000 221	0.287 996	0.004 368	0.040 449	0.000 617	333	9	257	3	256	4
11	0.32	0.051 567	0.000 205	0.285 924	0.002 973	0.040 193	0.000 387	265	9	255	2	254	2
12	0.26	0.051 542	0.000 198	0.288 122	0.003 648	0.040 526	0.000 500	265	7	257	3	256	3
13	0.14	0.051 506	0.000 203	0.287 307	0.003 494	0.040 445	0.000 483	265	9	256	3	256	3
14	0.30	0.051 453	0.000 245	0.286 376	0.004 149	0.040 354	0.000 564	261	11	256	3	255	3
15	0.43	0.051 457	0.000 220	0.286 716	0.003 385	0.040 400	0.000 460	261	42	256	3	255	3
16	0.10	0.051 647	0.000 212	0.313 657	0.005 189	0.044 037	0.000 717	333	9	277	4	278	4
17	0.07	0.051 704	0.000 209	0.289 664	0.004 238	0.040 619	0.000 576	272	9	258	3	257	4
18	0.32	0.051 517	0.000 182	0.289 042	0.003 994	0.040 682	0.000 556	265	7	258	3	257	3
19	0.22	0.053 184	0.000 600	0.297 887	0.006 642	0.040 462	0.000 527	345	26	265	5	256	3
20	0.05	0.051 284	0.000 201	0.284 239	0.002 899	0.040 183	0.000 380	254	3	254	2	254	2
21	0.18	0.051 421	0.000 218	0.286 660	0.003 398	0.040 432	0.000 474	261	42	256	3	256	3
22	0.04	0.051 285	0.000 171	0.287 261	0.004 638	0.040 609	0.000 637	254	3	256	4	257	4
23	0.28	0.051 251	0.000 202	0.286 129	0.004 040	0.040 481	0.000 552	254	9	256	3	256	3
24	0.31	0.051 178	0.000 246	0.284 859	0.004 951	0.040 366	0.000 687	256	11	255	4	255	4
25	0.17	0.051 391	0.000 195	0.287 395	0.004 466	0.040 540	0.000 599	257	42	257	4	256	4

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表 2 锆石Lu-Hf同位素测试结果

Table 2. Laser zircon Lu-Hf isotopic analytical results

测试点	¹⁷⁶Hf/¹⁷⁷Hf	1σ	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	ε_Hf(t)	T_DM2(Ga)
11SY-27
1	0.282 573	0.000 012	0.025 947	0.000 576	-1.6	1.4
2	0.282 588	0.000 014	0.073 833	0.001 542	-1.3	1.4
3	0.282 561	0.000 012	0.010 089	0.000 273	-2.0	1.4
4	0.282 541	0.000 014	0.014 962	0.000 401	-2.7	1.5
5	0.282 524	0.000 013	0.016 940	0.000 422	-3.3	1.5
6	0.282 510	0.000 014	0.015 009	0.000 394	-3.8	1.5
7	0.282 508	0.000 014	0.030 764	0.000 738	-4.0	1.5
8	0.282 528	0.000 015	0.029 997	0.000 680	-3.3	1.5
9	0.282 528	0.000 014	0.017 063	0.000 410	-3.2	1.5
10	0.282 529	0.000 012	0.009 981	0.000 319	-3.2	1.5
11	0.282 552	0.000 013	0.032 748	0.000 747	-2.4	1.4
12	0.282 511	0.000 018	0.067 414	0.001 721	-4.0	1.5
13	0.282 505	0.000 014	0.024 184	0.000 561	-4.0	1.5
14	0.282 588	0.000 014	0.038 743	0.000 860	-1.1	1.4
15	0.282 572	0.000 016	0.045 993	0.001 002	-1.7	1.4
16	0.282 608	0.000 017	0.089 508	0.001 836	-0.6	1.3
17	0.282 582	0.000 017	0.097 714	0.002 043	-1.6	1.4
18	0.282 525	0.000 015	0.037 837	0.000 841	-3.4	1.5
19	0.282 564	0.000 013	0.060 799	0.001 306	-2.1	1.4
20	0.282 573	0.000 015	0.039 711	0.000 903	-1.7	1.4
21	0.282 571	0.000 017	0.117 783	0.002 441	-2.0	1.4
22	0.282 539	0.000 016	0.050 032	0.001 061	-2.9	1.5
23	0.282 606	0.000 015	0.069 354	0.001 420	-0.6	1.3
24	0.282 529	0.000 013	0.038 771	0.000 855	-3.2	1.5
25	0.282 566	0.000 017	0.055 308	0.001 217	-2.0	1.4
11SY-28
1	0.282 568	0.000 012	0.064 260	0.001 381	-1.9	1.4
2	0.282 500	0.000 011	0.013 130	0.000 370	-4.1	1.5
3	0.282 515	0.000 014	0.007 078	0.000 256	-3.5	1.5
4	0.282 549	0.000 013	0.031 541	0.000 749	-2.4	1.4
5	0.282 503	0.000 021	0.015 386	0.000 430	-4.0	1.5
6	0.282 496	0.000 018	0.014 931	0.000 405	-4.2	1.6
7	0.282 561	0.000 012	0.023 914	0.000 596	-2.0	1.4
8	0.282 568	0.000 011	0.077 415	0.001 682	0.2	1.3
9	0.282 500	0.000 012	0.054 991	0.001 211	-2.6	1.5
10	0.282 515	0.000 016	0.039 121	0.000 851	-4.0	1.5
11	0.282 549	0.000 019	0.023 890	0.000 567	-3.1	1.5
12	0.282 503	0.000 016	0.040 643	0.000 954	-1.7	1.4
13	0.282 496	0.000 014	0.042 283	0.000 947	-3.2	1.5
14	0.282 561	0.000 019	0.034 335	0.000 768	-2.1	1.4
15	0.282 627	0.000 023	0.075 531	0.001 613	-0.6	1.3
16	0.282 544	0.000 018	0.029 350	0.000 665	-3.2	1.5
17	0.282 505	0.000 018	0.031 941	0.000 740	-3.6	1.4
18	0.282 529	0.000 015	0.046 970	0.001 019	-1.9	1.5
19	0.282 571	0.000 013	0.073 668	0.001 562	-3.6	1.5
20	0.282 526	0.000 012	0.029 352	0.000 654	-3.0	1.5
21	0.282 556	0.000 013	0.024 183	0.000 578	-3.1	1.6
22	0.282 604	0.000 013	0.018 838	0.000 474	-4.2	1.4
23	0.282 527	0.000 014	0.058 781	0.001 216	-1.1	1.5
24	0.282 514	0.000 011	0.024 699	0.000 558	-3.1	1.6
25	0.282 565	0.000 015	0.030 502	0.000 703	-4.4	1.4

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表 3 主量(%)、微量(10^-6)元素及Sr-Nd同位素测试结果

Table 3. Major elements (%), trace elements (10^-6) and Sr-Nd isotopic analytical results

样号	11SY-27	11SY-28
SiO₂	67.61	65.04
Al₂O₃	13.51	15.39
CaO	7.51	4.31
Fe₂O₃	5.12	5.03
K₂O	0.49	2.91
MgO	1.96	1.72
MnO	0.08	0.08
Na₂O	2.47	3.1
P₂O₅	0.1	0.37
TiO₂	0.63	1.34
LOI	0.43	0.67
Total	99.92	99.95
P	450	1 615
K	4 106	24 176
Sc	12.6	14.8
Ti	3 779	8 004
V	74.8	63.3
Cr	35.4	6.68
Co	9.04	9.32
Ni	23	3.35
Cu	54.1	11.9
Zn	84	125
Ga	14.6	22.5
Ge	1.26	1.46
Rb	22.4	240
Sr	482	302
Y	27.2	46.2
Zr	168	142
Nb	10.9	28.8
Cs	0.98	15.6
Ba	204	248
La	24	29.6
Ce	44.9	66.9
Pr	5.41	8.67
Nd	20.8	33.7
Sm	4.23	8.14
Eu	0.94	1.36
Gd	4.1	7.54
Tb	0.69	1.44
Dy	3.93	7.94
Ho	0.87	1.69
Er	2.39	4.36
Tm	0.39	0.62
Yb	2.5	3.81
Lu	0.37	0.53
Hf	4.04	4.02
Ta	0.59	2.51
Pb	9.75	15.9
Th	8.01	14.5
U	1.91	10
⁸⁷Rb/⁸⁶Sr	0.13	2.14
⁸⁷Sr/⁸⁶Sr	0.708 82	0.716 53
(⁸⁷Sr/⁸⁶Sr)_t	0.708 38	0.708 73
¹⁴⁷Sm/¹⁴⁴Nd	0.12	0.15
¹⁴³Nd/¹⁴⁴Nd	0.512 35	0.512 24
T_DM(Ga)	1.3	2.0
ε_Nd(t)	-3.2	-6.0

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参考文献(56)

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