塔吉克斯坦南帕米尔阿里秋（Alichur）穹隆花岗岩锆石U-Pb定年、Hf同位素特征及地质意义

刘江; 罗彦军; 范堡程; MustafoGadoev

doi:10.12401/j.nwg.2024027

塔吉克斯坦南帕米尔阿里秋（Alichur）穹隆花岗岩锆石U-Pb定年、Hf同位素特征及地质意义

1.
中国地质调查局西安地质调查中心，陕西西安　710119
2.
塔吉克斯坦国家科学院，地质、地震工程与地震学研究所，塔吉克斯坦杜尚别　734063

基金项目: 中国地质调查局项目“丝绸之路境内段（新疆）资源环境承载能力监测评价项目”（DD20221731），第三次新疆综合科学考察项目“塔里木河流域关键区生态适宜性评估及绿色发展建议”（2022xjkk0305），国家重点研发计划项目课题“中亚成矿域战略性矿产信息及成矿规律” (2021YFC2901802)联合资助

详细信息

作者简介:
刘江（1985–），男，博士，副研究员，主要从事构造地质研究。E-mail：liujiang689@163.com

中图分类号: P581
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出版历程
- 收稿日期: 2022-09-13
- 修回日期: 2023-12-13
- 录用日期: 2023-12-13
- 网络出版日期: 2024-10-13
- 刊出日期: 2024-12-19

U-Pb Dating, Hf-isotopic Characteristics and Tectonic Implications of Granite, Alichur Dome, Southern Pamir, Tajikistan

1.
Xi’an Center of China Geological Survey, Xi’an 710119, Shaanxi, China
2.
Institute of Geology, Earthquake Engineering and Seismology, National Academy of Sciences of Tajikistan, Dushanbe 734063, Tajikistan

摘要

摘要:
南帕米尔地区分布一系列受拆离断层控制，于印度–欧亚大陆碰撞过程中形成的穹隆构造，穹隆核部以晚中生代花岗岩和高级变质岩为主，并有少量新生代花岗质侵入岩。为阐明穹隆有关花岗岩的侵位背景和构造意义，笔者通过LA-MC-ICP锆石U-Pb定年测试获得侵位到穹隆拆离断层韧性剪切带中的花岗岩和占穹隆体积主体的核部白垩纪花岗岩年龄，分别为（19.3±0.4）Ma和（111.7±0.8）Ma。结合帕米尔地区和南帕米尔穹隆构造已有研究成果，笔者认为锆石Hf同位素特征反映南帕米尔地区晚中生代花岗岩是含有亏损地壳熔融作用的结果。新生代花岗岩形成于构造减压导致的中下地壳部分熔融作用，宏观上可能形成于印度板块碰撞俯冲过程中的减速调整阶段。

Abstract:
Cenozoic domes separated by detachments and formed during the India-Eurasian collision, are commonly distributed in the southern Pamir. The core complex of these domes are made up of high-grade metamorphic rocks and granite. The granite mainly formed during the Late Mesozoic and minor of them formed during the Cenozoic. The granite samples gathered along the detachments and from the granite comprising the bulk Alichur dome are measured by on the LA-MC-ICP U-Pb zircon dating. The formation times of the granite are (19.30±0.36) Ma and (111.7±0.8) Ma. Hf-isotopic characteristics of zircon demonstrate the granite formed by partial melting of crust. The Cenozoic granite is probably closely associated with the structural decompression caused by the extensional decollement of the domes.

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图 1 帕米尔地区构造地质简图（a）和Alichur穹隆构造地质图（b）（据Stübner et al.，2013b修改）

ACSZ. 阿里秋拆离断层；SPSZ. 南帕米尔剪切带

Figure 1. (a) Geological sketch of Pamir and (b) the geological map of Alichur dome

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图 2 阿里秋穹隆花岗岩野外、手标本和显微照片

A、C. 样品NP03野外露头和正交偏光显微照片；B、D. 样品NP04手标本（样品长度为13 cm）和正交偏光显微照片； Qtz. 石英；Pl. 斜长石；Kfs. 碱性长石

Figure 2. Photographys of granitic rocks from the Alichur dome in the views of outcrop, hand specimen and rock section

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图 3 阿里秋穹隆花岗岩代表性锆石CL图像、U-Pb年龄谐和图和年龄分布

a. 样品NP03锆石年龄与CL图像；b. NP04锆石年龄与CL图像；CL图像束斑直径为24 μm

Figure 3. CL images of representative zircons and zircon U-Pb concordia diagram of grantic rocks from the Alichur dome

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图 4 阿里秋穹隆花岗岩样品锆石ε_Hf-t图解

Figure 4. εHf-t diagram of grantic rocks from the Alichur dome

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表 1 南帕米尔阿里秋穹隆花岗岩LA-MC-ICPMS锆石原位U-Pb测试数据统计表

Table 1 LA-MC-ICPMS in-situ analysis of zircon U-Pb isotopic data of the granitic rocks from the Alichur dome

分析点号	含量（10⁻⁶）		Th/U	同位素比值						表观年龄（Ma）
分析点号	Th	U	Th/U	²⁰⁷Pb/²³⁵U	±1σ	²⁰⁶Pb/²³⁸U	±1σ	²⁰⁸Pb/²³²Th	±1σ	²⁰⁷Pb/²³⁵U	±1σ	²⁰⁶Pb/²³⁸U	±1σ	²⁰⁸Pb/²³²Th	±1σ
NP0301	143.8	218.79	0.66	0.01924	0.00617	0.00306	0.00020	0.00175	0.00035	19.3	6.15	19.7	1.27	35.4	7.09
NP0303	74.3	1073.54	0.07	0.01875	0.00151	0.00287	0.00010	0.00076	0.00080	18.9	1.50	18.5	0.67	15.3	16.17
NP0305	242.0	1273.30	0.19	0.01868	0.00147	0.00289	0.00010	0.00110	0.00023	18.8	1.47	18.6	0.67	22.2	4.71
NP0306	105.8	399.03	0.27	0.01982	0.00494	0.00299	0.00017	0.00066	0.00062	19.9	4.92	19.3	1.06	13.3	12.54
NP0307	474.1	1537.50	0.31	0.02046	0.00138	0.00305	0.00011	0.00113	0.00017	20.6	1.37	19.6	0.68	22.9	3.37
NP0308	416.4	814.53	0.51	0.01909	0.00219	0.00300	0.00013	0.00125	0.00016	19.2	2.18	19.3	0.80	25.3	3.13
NP0309	160.3	373.64	0.43	0.02008	0.00468	0.00302	0.00019	0.00094	0.00050	20.2	4.66	19.4	1.25	19.0	10.00
NP0311	93.1	5043.10	0.02	0.01862	0.00096	0.00282	0.00009	0.00446	0.00116	18.7	0.96	18.2	0.59	90.0	23.32
NP0312	273.3	1000.64	0.27	0.01915	0.00185	0.00303	0.00011	0.00180	0.00023	19.3	1.84	19.5	0.73	36.4	4.74
NP0314	125.3	214.46	0.58	0.02058	0.00635	0.00317	0.00023	0.00033	0.00048	20.7	6.32	20.4	1.46	6.6	9.63
NP0315	118.0	188.78	0.62	0.02032	0.00798	0.00299	0.00021	0.00095	0.00048	20.4	7.95	19.2	1.35	19.2	9.66
NP0316	143.2	1130.85	0.13	0.02051	0.00157	0.00311	0.00011	0.00077	0.00034	20.6	1.56	20.0	0.71	15.5	6.82
NP0317	153.1	211.37	0.72	0.02003	0.00869	0.00308	0.00022	0.00061	0.00047	20.1	8.65	19.8	1.39	12.4	9.44
NP0319	114.2	620.13	0.18	0.01979	0.00314	0.00299	0.00016	0.00107	0.00059	19.9	3.12	19.2	1.01	21.5	11.96
NP0321	122.4	342.71	0.36	0.01900	0.00438	0.00298	0.00017	0.00122	0.00047	19.1	4.36	19.2	1.08	24.6	9.57
NP0322	312.4	1203.89	0.26	0.02029	0.00166	0.00308	0.00012	0.00163	0.00020	20.4	1.66	19.8	0.74	32.8	4.08
NP0323	353.8	884.27	0.40	0.01995	0.00185	0.00300	0.00011	0.00108	0.00016	20.1	1.84	19.3	0.74	21.9	3.18
NP0324	247.9	438.90	0.56	0.01879	0.00401	0.00310	0.00016	0.00106	0.00023	18.9	3.99	20.0	1.03	21.3	4.61
NP0325	104.3	395.11	0.26	0.01962	0.00401	0.00298	0.00017	0.00153	0.00051	19.7	4.00	19.2	1.09	31.0	10.30
NP0326	513.0	879.07	0.58	0.01956	0.00220	0.00304	0.00013	0.00121	0.00013	19.7	2.19	19.5	0.81	24.3	2.60
NP0327	213.9	1486.34	0.14	0.02058	0.00172	0.00310	0.00012	0.00130	0.00030	20.7	1.71	19.9	0.78	26.3	5.97
NP0328	111.5	246.43	0.45	0.01994	0.00945	0.00300	0.00025	0.00193	0.00070	20.0	9.41	19.3	1.58	39.0	14.14
NP0330	113.6	390.17	0.29	0.02005	0.00729	0.00322	0.00025	0.00030	0.00097	20.2	7.26	20.7	1.58	6.1	19.55
NP0402	57.9	2654.42	0.02	0.12643	0.00510	0.0173	0.0005	0.00058	0.00166	120.9	4.6	110.7	3.3	11.7	33.5
NP0403	171.0	269.53	0.63	0.39155	0.02198	0.0512	0.0017	0.02486	0.00131	335.5	16.0	321.8	10.3	496.4	25.9
NP0405	412.3	724.18	0.57	0.82503	0.02686	0.0977	0.0028	0.02909	0.00111	610.8	14.9	600.8	16.3	579.5	21.8
NP0406	101.7	1267.19	0.08	0.15105	0.00707	0.0207	0.0007	0.01285	0.00162	142.8	6.2	132.2	4.2	258.1	32.3
NP0407	37.6	1524.64	0.02	0.11813	0.00478	0.0175	0.0005	0.00206	0.00274	113.4	4.3	111.6	3.3	41.5	55.3
NP0408	77.4	2529.12	0.03	0.12049	0.00430	0.0174	0.0005	0.00800	0.00135	115.5	3.9	110.9	3.2	161.1	27.1
NP0409	52.9	3352.01	0.02	0.11700	0.00379	0.0171	0.0005	0.00561	0.00200	112.4	3.5	109.1	3.0	113.2	40.2
NP0410	104.3	4012.15	0.03	0.11850	0.00400	0.0175	0.0005	0.00658	0.00120	113.7	3.6	112.0	3.1	132.6	24.1
NP0411	59.7	3293.66	0.02	0.11706	0.00375	0.0177	0.0005	0.00676	0.00132	112.4	3.4	112.8	3.1	136.1	26.5
NP0413	162.2	436.98	0.37	0.70484	0.02512	0.0872	0.0026	0.02872	0.00143	541.7	15.0	539.2	15.2	572.3	28.1
NP0414	67.5	1492.78	0.05	0.12044	0.00474	0.0176	0.0005	0.00713	0.00160	115.5	4.3	112.6	3.3	143.7	32.1
NP0415	70.0	1037.48	0.07	0.12457	0.00607	0.0177	0.0006	0.00495	0.00148	119.2	5.5	113.2	3.6	99.8	29.8
NP0416	81.5	1462.34	0.06	0.12392	0.00455	0.0176	0.0005	0.00631	0.00113	118.6	4.1	112.4	3.2	127.1	22.7
NP0417	51.1	1906.82	0.03	0.11629	0.00449	0.0175	0.0005	0.00441	0.00170	111.7	4.1	111.6	3.3	89.0	34.2
NP0418	85.2	3397.08	0.03	0.11352	0.00366	0.0174	0.0005	0.00435	0.00119	109.2	3.3	111.3	3.1	87.7	24.0
NP0419	78.5	251.13	0.31	0.11288	0.00346	0.0174	0.0005	0.00766	0.00113	108.6	3.2	111.2	3.1	154.1	22.7
NP0420	251.1	255.73	0.98	1.25702	0.04523	0.1377	0.0042	0.04214	0.00162	826.6	20.4	831.7	23.6	834.2	31.5
NP0421	93.1	4868.35	0.02	0.11638	0.00365	0.0175	0.0005	0.00725	0.00111	111.8	3.3	111.6	3.1	145.9	22.3
NP0422	38.1	1223.48	0.03	0.11991	0.00622	0.0175	0.0006	0.00117	0.00210	115.0	5.6	112.0	3.7	23.7	42.4
NP0424	70.9	852.63	0.08	0.12380	0.00808	0.0178	0.0007	0.00404	0.00151	118.5	7.3	113.6	4.3	81.4	30.4
NP0425	116.7	135.35	0.86	0.72411	0.03842	0.0913	0.0031	0.02536	0.00158	553.1	22.6	563.0	18.1	506.2	31.1
NP0426	223.5	495.14	0.45	1.28393	0.03913	0.1380	0.0040	0.03992	0.00152	838.6	17.4	833.5	22.5	791.1	29.5
NP0427	42.5	1101.99	0.04	0.12908	0.01095	0.0210	0.0009	0.00672	0.00484	123.3	9.9	134.2	5.5	135.4	97.2
NP0428	36.1	2083.96	0.02	0.12043	0.00983	0.0175	0.0007	0.02813	0.01335	115.5	8.9	111.8	4.2	560.8	262.4
NP0429	72.7	4401.50	0.02	0.06997	0.02132	0.0111	0.0008	0.04031	0.03220	68.7	20.2	71.3	4.9	798.8	625.7
NP0430	29.2	2307.17	0.01	0.11104	0.01823	0.0174	0.0008	−0.05540	0.04297	106.9	16.7	111.1	5.3	******	919.5

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表 2 南帕米尔阿里秋穹隆花岗岩LA-MC-ICPMS锆石原位Lu-Hf同位素测试数据统计表

Table 2 LA-MC -ICPMS in-situ analysis of zircon Lu-Hf isotopic compositions of the granitic rocks from the Alichur dome

样点	t（Ma）	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	±2σ	εHf（t）	±1σ	TM1（Ga）	±1σ	TM2（Ga）	±1σ
Hf-NP0301	19.7	0.013835	0.000476	0.282585	0.000026	−6.2	0.9	0.933	0.037	1.493	0.037
Hf-NP0303	18.9	0.013484	0.000423	0.282658	0.000044	−3.6	1.5	0.830	0.061	1.329	0.061
Hf-NP0305	18.8	0.018061	0.000593	0.282655	0.000031	−3.7	1.1	0.837	0.044	1.335	0.044
Hf-NP0306	19.3	0.014554	0.000500	0.282677	0.000029	−2.9	1.0	0.805	0.040	1.286	0.040
Hf-NP0307	19.6	0.022387	0.000757	0.282745	0.000033	−0.5	1.2	0.714	0.047	1.132	0.047
Hf-NP0308	19.3	0.016693	0.000539	0.282641	0.000031	−4.2	1.1	0.855	0.043	1.365	0.043
Hf-NP0309	19.4	0.021724	0.000784	0.282696	0.000028	−2.3	1.0	0.785	0.039	1.244	0.039
Hf-NP0311	18.2	0.026357	0.000993	0.282687	0.000011	−2.6	0.4	0.801	0.016	1.264	0.016
Hf-NP0312	19.5	0.028432	0.001018	0.282701	0.000029	−2.1	1.0	0.782	0.042	1.232	0.042
Hf-NP0314	20.4	0.019871	0.000711	0.282657	0.000014	−3.6	0.5	0.837	0.019	1.330	0.019
Hf-NP0315	19.2	0.009878	0.000339	0.282643	0.000028	−4.1	1.0	0.848	0.038	1.361	0.038
Hf-NP0316	20.0	0.005533	0.000200	0.282630	0.000024	−4.6	0.8	0.863	0.033	1.391	0.033
Hf-NP0317	19.8	0.020546	0.000749	0.282664	0.000030	−3.4	1.0	0.828	0.042	1.315	0.042
Hf-NP0319	19.2	0.011475	0.000420	0.282679	0.000026	−2.9	0.9	0.801	0.036	1.282	0.036
Hf-NP0321	19.2	0.010760	0.000401	0.282630	0.000028	−4.6	1.0	0.867	0.039	1.390	0.039
Hf-NP0322	19.8	0.009521	0.000336	0.282591	0.000026	−6.0	0.9	0.920	0.036	1.478	0.036
Hf-NP0323	19.3	0.030648	0.001102	0.282693	0.000026	−2.4	0.9	0.795	0.036	1.251	0.036
Hf-NP0324	20.0	0.016524	0.000586	0.282647	0.000031	−4.0	1.1	0.848	0.043	1.352	0.043
Hf-NP0325	19.2	0.011486	0.000436	0.282671	0.000024	−3.2	0.8	0.811	0.033	1.299	0.033
Hf-NP0326	19.5	0.025873	0.000898	0.282644	0.000029	−4.1	1.0	0.860	0.041	1.360	0.041
Hf-NP0327	19.9	0.032599	0.001179	0.282693	0.000026	−2.4	0.9	0.796	0.036	1.249	0.036
Hf-NP0328	19.3	0.014380	0.000508	0.282753	0.000026	−0.2	0.9	0.698	0.036	1.114	0.036
Hf-NP0330	20.7	0.010649	0.000385	0.282629	0.000025	−4.6	0.9	0.869	0.034	1.393	0.034
Hf-NP0402	110.7	0.009428	0.000422	0.281634	0.000040	−37.8	1.4	2.234	0.054	3.541	0.054
Hf-NP0403	321.8	0.033497	0.001303	0.282266	0.000028	−11.1	1.0	1.404	0.040	2.030	0.040
Hf-NP0405	600.8	0.019334	0.000761	0.282540	0.000024	4.7	0.8	1.002	0.033	1.243	0.033
Hf-NP0406	132.2	0.012261	0.000446	0.282382	0.000027	−10.9	0.9	1.212	0.037	1.876	0.037
Hf-NP0407	111.6	0.016362	0.000665	0.282352	0.000025	−12.4	0.9	1.261	0.035	1.956	0.035
Hf-NP0408	110.9	0.010549	0.000445	0.282450	0.000022	−9.0	0.8	1.118	0.030	1.738	0.030
Hf-NP0409	109.1	0.011997	0.000513	0.281952	0.000043	−26.7	1.5	1.806	0.058	2.845	0.058
Hf-NP0410	112.0	0.052777	0.002021	0.282493	0.000023	−7.6	0.8	1.105	0.033	1.649	0.033
Hf-NP0411	112.8	0.012904	0.000532	0.282024	0.000028	−24.0	1.0	1.709	0.039	2.685	0.039
Hf-NP0413	541.7	0.008217	0.000373	0.282127	0.000025	−11.0	0.9	1.561	0.035	2.191	0.035
Hf-NP0414	112.6	0.012957	0.000487	0.282341	0.000023	−12.8	0.8	1.271	0.032	1.981	0.032
Hf-NP0415	113.2	0.018810	0.000726	0.282372	0.000024	−11.7	0.9	1.235	0.034	1.912	0.034
Hf-NP0416	112.4	0.036871	0.001403	0.282448	0.000024	−9.1	0.9	1.150	0.035	1.746	0.035
Hf-NP0417	111.6	0.024663	0.000937	0.282196	0.000042	−18.0	1.5	1.488	0.059	2.305	0.059
Hf-NP0418	111.3	0.029875	0.001134	0.282364	0.000024	−12.1	0.8	1.260	0.033	1.932	0.033
Hf-NP0419	111.2	0.034272	0.001311	0.282408	0.000021	−10.5	0.8	1.204	0.030	1.836	0.030
Hf-NP0420	831.7	0.020417	0.000968	0.281814	0.000028	−16.1	1.0	2.018	0.038	2.721	0.038
Hf-NP0421	111.6	0.026561	0.001049	0.282380	0.000023	−11.5	0.8	1.235	0.032	1.897	0.032
Hf-NP0422	112.0	0.027846	0.001096	0.282494	0.000025	−7.5	0.9	1.076	0.035	1.643	0.035
Hf-NP0424	113.6	0.020349	0.000780	0.282405	0.000024	−10.5	0.8	1.191	0.033	1.838	0.033
Hf-NP0425	553.1	0.018401	0.000755	0.282477	0.000024	1.5	0.8	1.090	0.033	1.414	0.033
Hf-NP0426	833.5	0.013424	0.000569	0.282360	0.000021	3.5	0.7	1.247	0.029	1.500	0.029
Hf-NP0427	134.2	0.019654	0.000760	0.282362	0.000024	−11.6	0.8	1.251	0.034	1.922	0.034
Hf-NP0428	111.8	0.019300	0.000752	0.282281	0.000034	−15.0	1.2	1.363	0.047	2.116	0.047
Hf-NP0429	71.3	0.038764	0.001422	0.282434	0.000029	−10.5	1.0	1.171	0.041	1.801	0.041
Hf-NP0430	111.1	0.025280	0.000969	0.282389	0.000031	−11.2	1.1	1.220	0.044	1.876	0.044
注：本次实验采用91500作标样，所测样品锆石的Hf同位素成分用标样进行校正；表中锆石Hf同位素成分的计算参数为：λ（¹⁷⁶Lu）=1.867×10⁻¹¹a⁻¹，球粒陨石¹⁷⁶Lu/¹⁷⁷Hf =0.0332，¹⁷⁶Hf/¹⁷7Hf =0.282 772（Blichert-Toft et al.，1997）；亏损地幔¹⁷⁶Lu/¹⁷⁷Hf =0.0384，¹⁷⁶Hf/¹⁷⁷Hf =0.28325（Griffin et al.，2000）。

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