川西九龙花椒坪燕山期花岗岩的厘定及其地质意义

张洪超; 周洪兵; 严波; 孙崇波; 姚文; 谭洪旗

doi:10.3969/j.issn.1000-6532.2024.01.001

川西九龙花椒坪燕山期花岗岩的厘定及其地质意义

1.
四川省地质调查研究院，四川省金属地质调查研究所，四川　成都　611730

2.
四川省地质矿产（集团）有限公司，四川　成都　610016

基金项目: 四川省地质调查研究院项目（SCIGS-CZDXM-2023003）；国家自然科学基金项目（41603034）

详细信息

作者简介: 张洪超（1984-），男，高级工程师，研究方向为地质调查与找矿

通讯作者: 谭洪旗（1984-）男，高级工程师，研究方向为岩石学、地球化学专业。

中图分类号: P597+.3

收稿日期: 2023-07-10

刊出日期: 2024-02-25

Determination of Yanshanian Granite and its Geological Significance in the Taka Dome, Western Sichuan

1.
Sichuan Institute of Geological Survey, Sichuan Institute of Metal Geological Survey, Chengdu 611730, Sichuan, China

2.
Sichuan Geological and Mineral Resources Group Co., Ltd, Chengdu 610016, Sichuan, China

More Information

Corresponding author: TAN Hongqi, hongqitan@163.com

Received Date: 10 July 2023

Publish Date: 25 February 2024

摘要

摘要:
这是一篇地球科学领域的论文。川西九龙是目前燕山期花岗岩分布最为集中的地区，有铁厂河、桥棚子-烂碉及新火山岩体。踏卡穹隆外围花椒坪分布有约0.5 km²的花岗岩岩株，本文通过对该花岗岩开展LA-ICP-MS锆石U-Pb年代学研究，以确定该花岗岩的形成时代及其与周边花岗岩的时空联系，为松潘-甘孜南缘里伍式铜矿的对比研究提供依据。结果显示，花椒坪花岗岩成岩年龄为（163.1±1.4） Ma，该岩体遭受了晚期（146±3） Ma的岩浆作用或构造热事件改造，与周边铁厂河、新火山、洛莫地区花岗岩体经历的地质事件一致。花椒坪花岗岩浆温度为592～727 ℃（平均温度648 ℃），明显低于桥棚子花岗岩浆温度（766～804 ℃），为低温花岗岩。结合区域地质背景，170～140 Ma，松潘—甘孜地块南缘岩石圈处于伸展阶段，早期（163 Ma）以花椒坪为主体的花岗岩浆活动，晚期（146 Ma）遭受了岩浆作用或构造热事件的改造。这一发现丰富了九龙地区燕山期岩浆或构造-热事件。
- 地球科学 /
- 川西 /
- 九龙 /
- 花椒坪 /
- 花岗岩 /
- 锆石
Abstract:
This is an article in the field of earth sciences. Jiulong area is the most concentrated area of Yanshanian granite found in western Sichuan, including Tiechanghe, Qiaopengzi-Landiao and Xinhuoshangranite. In this paper, LA-ICP-MS zircon U-Pb dating were carried out to determine the formation age of the granite, and its temporal-spatial relationship with the surrounding granites, providing a basis for the comparative study of Liwu copper deposit in the southern margin of Songpan-Ganzi block. The results show thatthe diagenetic age of Huajiaoping granite is (163.1±1.4) Ma, andit underwent magmatic or tectonic thermal events at (146±3) Ma, which is consistent withthe geological events ofTiechanghe, Xinhuoshan and Luomogranite. The magma temperature of Huajiaoping granite is 592～727 ℃ (average temperature 648 ℃), which is significantly lower than that of Qiaopengzi granite (766～804 ℃). Combined with the regional geological background, about 170 ～ 140 Ma, the lithosphere in the southern margin of Songpan Ganzi block is in the extension stage. The granite magma activity dominated in the early stage (163 Ma) by Huajiaoping granite, and in the late stage (146 Ma) by magmatism or tectonic thermal events. This discovery enriched the Yanshannian granitic magmatic thermal events in Jiulong area.
- Earth sciences /
- Western Sichuan /
- Jiulong /
- Huajiaoping /
- Granite /
- Zircon

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图 1 川西江浪-踏卡穹隆及其邻区地质略图（据文献[18]修改）

Figure 1.

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图 2 川西花椒坪花岗岩锆石的谐和图、加权平均值及锆石稀土球粒陨石标准化配分

Figure 2.

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表 1 花椒坪花岗岩样品LA-ICP-MS 锆石 U-Pb 年龄数据

Table 1. LA-ICP-MS zircon U-Pb isotopic age data of Huajiaoping granite

测点	Th	U	Th/U	同位素比值						同位素年龄/Ma						谐和率 /%	T /℃
测点	g/t		Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	谐和率 /%	T /℃
060301
1	11830	4905	2.41	0.05222	0.00138	0.18548	0.00509	0.02575	0.00056	295	59	173	4	164	4	95%	872
2	2264	2499	0.91	0.10525	0.00250	0.29758	0.00739	0.02050	0.00045	1719	43	265	6	131	3	49%	—
3	547	1275	0.43	0.05035	0.00203	0.15852	0.00641	0.02283	0.00052	211	91	149	6	146	3	97%	710
4	644	476	1.35	0.10593	0.00321	0.40909	0.01255	0.02800	0.00064	1731	55	348	9	178	4	51%	—
5	537	1423	0.38	0.05072	0.00126	0.17988	0.00466	0.02571	0.00056	228	56	168	4	164	4	97%	661
6	2376	3451	0.69	0.07214	0.00170	0.23652	0.00585	0.02377	0.00052	990	47	216	5	152	3	70%	—
7	375	2123	0.18	0.04988	0.00118	0.17730	0.00443	0.02578	0.00056	189	54	166	4	164	4	99%	611
8	774	1594	0.49	0.05012	0.00137	0.17891	0.00507	0.02588	0.00057	201	62	167	4	165	4	99%	677
9	1079	2117	0.51	0.08513	0.00201	0.26741	0.00663	0.02278	0.00050	1319	45	241	5	145	3	60%	—
10	480	1648	0.29	0.05226	0.00144	0.18696	0.00533	0.02594	0.00057	297	62	174	5	165	4	95%	642
11	890	1991	0.45	0.04896	0.00120	0.17530	0.00452	0.02596	0.00057	146	57	164	4	165	4	101%	652
12	452	964	0.47	0.05142	0.00163	0.18280	0.00591	0.02578	0.00058	260	71	171	5	164	4	96%	632
13	250	965	0.26	0.04921	0.00149	0.17448	0.00541	0.02571	0.00057	158	69	163	5	164	4	100%	611
14	1424	1913	0.74	0.05124	0.00148	0.18140	0.00541	0.02567	0.00057	251	65	169	5	163	4	97%	674
15	515	1345	0.38	0.05232	0.00290	0.18091	0.00994	0.02507	0.00062	299	122	169	9	160	4	95%	676
16	3438	2400	1.43	0.05105	0.00176	0.17956	0.00627	0.02550	0.00058	243	77	168	5	162	4	97%	701
17	331	1185	0.28	0.05048	0.00142	0.17930	0.00521	0.02576	0.00057	217	64	168	4	164	4	98%	636
18	304	958	0.32	0.04945	0.00194	0.17095	0.00675	0.02507	0.00057	169	89	160	6	160	4	100%	635
19	732	1752	0.42	0.05062	0.00123	0.17481	0.00447	0.02504	0.00055	224	55	164	4	159	3	97%	653
20	621	1363	0.46	0.05149	0.00163	0.18674	0.00605	0.02630	0.00059	263	71	174	5	167	4	96%	635
21	724	1117	0.65	0.05213	0.00181	0.18106	0.00636	0.02519	0.00057	291	77	169	5	160	4	95%	643
22	666	1553	0.43	0.04946	0.00146	0.17587	0.00534	0.02578	0.00057	170	67	165	5	164	4	100%	595
23	335	1420	0.24	0.05009	0.00160	0.17515	0.00573	0.02535	0.00057	199	73	164	5	161	4	98%	618
24	537	982	0.55	0.04919	0.00137	0.17552	0.00506	0.02588	0.00057	157	64	164	4	165	4	100%	652
25	952	1892	0.50	0.05172	0.00127	0.17972	0.00464	0.02520	0.00055	273	55	168	4	160	3	96%	664
26	476	1822	0.26	0.05911	0.00147	0.20716	0.00541	0.02541	0.00056	571	53	191	5	162	4	85%	—
27	1264	1676	0.75	0.04980	0.00132	0.17189	0.00475	0.02503	0.00055	186	61	161	4	159	3	99%	707
28	2238	1044	2.14	0.04964	0.00141	0.17491	0.00513	0.02555	0.00057	178	65	164	4	163	4	99%	727
29	631	1595	0.40	0.04978	0.00123	0.17765	0.00460	0.02588	0.00057	185	56	166	4	165	4	99%	640
30	604	1639	0.37	0.04977	0.00171	0.17874	0.00624	0.02604	0.00059	184	78	167	5	166	4	99%	649
31	114	609	0.19	0.05010	0.00177	0.17621	0.00632	0.02550	0.00058	200	80	165	5	162	4	98%	609
32	568	1251	0.45	0.06379	0.00178	0.22966	0.00662	0.02611	0.00058	735	58	210	5	166	4	79%	—
33	208	988	0.21	0.04988	0.00153	0.17778	0.00558	0.02585	0.00058	190	70	166	5	165	4	99%
34	204	1292	0.16	0.06688	0.00221	0.21503	0.00722	0.02332	0.00053	834	67	198	6	149	3	75%	—
35	579	789	0.73	0.05811	0.00232	0.19082	0.00766	0.02382	0.00056	533	86	177	7	152	4	86%	—
36	275	1100	0.25	0.05009	0.00153	0.17810	0.00560	0.02579	0.00058	199	70	166	5	164	4	99%	592
T（℃）为锆石Ti温度计，参见文献 [21]。

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表 2 川西九龙花椒坪花岗岩锆石的微量元素数据

Table 2. Zircon trace element data of Huajiaoping granite in Jiulong Region，Western Sichuan Province

220530	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Y	ΣREE	LREE	HREE	L/H	La_N/ Yb_N	δEu	δCe
1	15.83	124.60	8.84	82.28	99.28	13.77	288.30	67.64	526.6	128.1	420.7	73.3	596	89.3	4389	2535	345	2191	0.16	0.02	0.23	2.55
3	3.51	34.15	1.69	10.62	8.43	3.16	27.63	8.32	84.5	30.5	132.6	30.8	331	63.9	1028	771	62	709	0.09	0.01	0.57	3.42
5	8.65	33.48	2.66	13.12	7.76	1.87	29.92	8.95	96.5	34.1	145.5	31.1	300	56.4	1063	770	68	702	0.10	0.02	0.33	1.70
7	3.22	15.01	1.11	5.49	2.84	0.88	12.60	4.63	53.7	21.0	97.7	23.2	238	47.1	702	527	29	498	0.06	0.01	0.38	1.94
8	3.20	22.94	0.76	4.52	4.56	2.33	22.29	6.84	71.1	24.3	107.2	23.4	233	42.1	820	568	38	530	0.07	0.01	0.58	3.48
10	16.12	45.05	4.03	17.08	6.75	1.80	18.67	5.84	66.5	24.8	113.4	26.8	284	51.9	817	683	91	592	0.15	0.04	0.46	1.33
11	4.73	32.92	1.41	7.13	5.54	1.57	22.96	7.55	79.0	27.9	121.0	27.4	278	50.9	913	668	53	615	0.09	0.01	0.37	3.09
12	0.20	27.89	0.15	1.95	3.13	1.22	14.68	5.04	56.2	21.0	95.9	22.0	244	46.1	690	539	35	504	0.07	0.00	0.46	37.33
13	0.09	12.63	0.10	1.41	2.82	1.30	13.30	4.66	54.5	20.3	96.0	23.0	243	45.3	663	518	18	500	0.04	0.00	0.54	28.56
14	2.64	55.53	1.46	13.84	13.68	2.13	45.48	13.05	123.3	39.5	158.9	32.4	303	55.4	1202	860	89	771	0.12	0.01	0.24	6.85
15	0.07	35.57	0.16	1.75	4.34	1.91	19.37	6.94	78.2	28.3	131.6	33.3	348	62.4	944	752	44	708	0.06	0.00	0.54	58.72
16	0.89	79.08	1.08	11.50	18.37	7.46	65.57	18.89	169.7	53.3	208.0	41.1	362	60.7	1733	1098	118	980	0.12	0.00	0.59	17.14
17	3.63	18.91	0.84	4.38	3.52	1.38	16.76	5.13	60.2	23.4	108.3	25.6	272	52.5	773	597	33	564	0.06	0.01	0.45	2.56
18	10.26	35.99	2.72	14.42	5.40	1.63	19.78	6.13	70.7	26.0	117.0	26.8	275	53.6	851	665	70	595	0.12	0.03	0.43	1.64
19	0.18	17.93	0.17	2.30	5.59	1.71	25.98	8.66	96.3	34.9	152.4	32.8	330	59.5	1111	768	28	740	0.04	0.00	0.36	22.93
20	2.08	20.79	0.79	4.15	3.79	1.49	14.84	4.56	49.5	18.5	81.1	18.4	194	36.1	610	451	33	418	0.08	0.01	0.53	3.99
21	22.93	84.49	7.36	37.99	19.75	3.59	49.94	13.35	133.5	43.2	174.0	36.4	345	64.2	1300	1036	176	860	0.20	0.05	0.33	1.58
22	11.75	46.23	3.73	19.00	8.73	2.33	30.99	9.26	101.7	35.9	159.6	34.7	352	65.1	1178	881	92	789	0.12	0.02	0.39	1.70
23	0.02	18.39	0.06	1.19	1.94	0.92	10.79	3.72	45.9	17.7	89.7	22.1	250	51.2	657	514	23	491	0.05	0.00	0.49	91.24
24	0.56	28.25	0.26	2.77	4.02	1.58	17.56	5.57	62.8	22.9	105.1	24.0	261	52.8	792	589	37	551	0.07	0.00	0.49	18.22
25	2.24	31.69	0.81	5.92	6.37	1.73	27.93	9.33	99.4	35.3	149.9	32.0	308	55.6	1148	766	49	718	0.07	0.01	0.34	5.77
27	0.56	24.52	0.34	4.11	6.33	2.17	29.57	9.24	102.9	35.5	157.6	33.4	322	59.5	1177	788	38	750	0.05	0.00	0.40	13.61
28	7.85	116.94	3.15	26.19	28.45	15.76	91.51	25.97	260.4	86.9	358.1	73.7	694	122.3	2989	1911	198	1712	0.12	0.01	0.86	5.77
29	0.17	14.72	0.06	0.87	2.24	1.06	13.69	4.63	54.6	21.3	100.3	23.0	241	46.1	745	524	19	505	0.04	0.00	0.45	36.20
30	0.75	30.03	0.48	4.92	7.84	2.45	31.99	9.61	102.6	37.1	162.4	36.1	375	67.3	1211	869	46	823	0.06	0.00	0.41	12.01
31	2.24	9.88	0.56	2.83	1.32	0.56	7.37	2.61	32.3	12.9	64.7	15.0	164	32.7	454	349	17	332	0.05	0.01	0.43	2.10
33	0.02	8.45	0.01	0.47	1.11	0.58	7.95	3.07	38.4	16.2	81.5	19.6	224	44.9	575	446	11	436	0.02	0.00	0.44	126.25
36	0.01	13.39	0.05	0.84	1.59	0.64	8.74	3.25	39.5	16.7	84.8	21.1	233	48.7	610	473	17	456	0.04	0.00	0.42	71.17

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