青海野马泉铁多金属矿床2期成岩成矿事件：来自锆石、石榴子石U-Pb定年和全岩地球化学的证据

钟永生; 刘宏宇; 陈超; 吕新彪; 张仲成; 刘源林; 张得龙; 黄天赐

doi:10.19509/j.cnki.dzkq.tb20250227

青海野马泉铁多金属矿床2期成岩成矿事件：来自锆石、石榴子石U-Pb定年和全岩地球化学的证据

doi: 10.19509/j.cnki.dzkq.tb20250227

钟永生^{1, 2,},
刘宏宇^{3a, 4, ,},
陈超^3b,
吕新彪^{3a, 3b},
张仲成^3a,
刘源林^3b,
张得龙²,
黄天赐^{3b, 5}

1.
成都理工大学地球与行星科学学院，成都 610059
2.
西部矿业集团有限公司，西宁 810000
3a.
中国地质大学（武汉）：资源学院
3b.
中国地质大学（武汉）：自然资源调查研究院，武汉 430074
4.
浙江第三地质大队，浙江金华321000
5.
湖北省地质局第七地质大队，宜昌 443100

基金项目: 西部矿业股份有限公司科研项目“青海省格尔木市野马泉−它温查汉−拉陵高里河下游铁多金属矿集区成矿规律与找矿预测研究”

详细信息

作者简介:
钟永生：E-mail：179339952@qq.com

通讯作者:
E-mail：lhy@cug.edu.cn

中图分类号: P611
计量
- 文章访问数: 250
- PDF下载量: 20
- 被引次数: 0
出版历程
- 收稿日期: 2025-05-16
- 录用日期: 2025-09-01
- 修回日期: 2025-09-01
- 网络出版日期: 2025-12-15

Two episodes of magmatism and mineralization at Yemaquan Fe-polymetallic deposit, Qinghai Province: Evidence from zircon and garnet U-Pb dating and whole-rock geochemistry

ZHONG Yongsheng^{1, 2
,},
LIU Hongyu^{3a, 4
, ,},
CHEN Chao^3b,
LYU Xinbiao^{3a, 3b},
ZHANG Zhongcheng^3a,
LIU Yuanlin^3b,
ZHANG Delong²,
HUANG Tianci^{3b, 5}

1.
College of Earth and Planetary Sciences, Chengdu University of Technology, Chengdu 610059, China
2.
Western Mining Group Co., Ltd., Xining 810000, China
3a.
School of Earth Resources
3b.
Institute of Natural Resources Survey, China University of Geosciences (Wuhan), Wuhan 430074, China
4.
No. 3 Geological Brigade of Zhejiang Province, Jinhua Zhejiang 321000
5.
No. 7 Geological Brigade of Hubei Geological Bureau, Yichang Hubei 443100, China

More Information

Author Bio:
E-mail：179339952@qq.com

Corresponding author: E-mail：lhy@cug.edu.cn

摘要

摘要:
青海省祁漫塔格地处柴达木盆地南缘，隶属东昆仑成矿带，区域广泛发育晚古生代−中生代岩浆活动，产出虎头崖、卡尔却卡、牛苦头等大量铁−铜−铅−锌多金属矿床，已有研究证实多数矿床存在2期成岩成矿作用。野马泉是区内典型矽卡岩型铁多金属矿床，以往研究仅聚焦矿区晚三叠世花岗岩−矽卡岩成矿系统，普遍认为仅三叠纪岩浆活动控制矿化，泥盆纪侵入岩的成矿潜力缺少年代与地球化学约束，野马矿床是否存在2期独立岩浆−成矿事件长期存在争议。以野马泉矿区西部晚三叠世侵入岩、东南部 M13 磁异常区钻孔深部泥盆纪花岗闪长岩及接触带矽卡岩石榴子石为研究对象，开展野外地质填图、岩相学显微鉴定，配套完成锆石与石榴子石 LA-ICP-MS U-Pb 定年、全岩主微量元素测试、锆石原位 Lu-Hf 同位素分析，系统约束2期岩体形成时代、岩浆源区与构造属性。矿区西南部闪长岩、二长花岗岩、正长花岗岩锆石 ²⁰⁶Pb/²³⁸U 加权平均年龄集中 223.4～225.0 Ma（MSWD=1.7～2.4），与矿区云母 Ar-Ar 成矿年龄 222±1.3 Ma 高度吻合，限定晚三叠世岩浆及配套矽卡岩成矿时限；M13 深部花岗闪长岩锆石年龄 392.0～392.8 Ma，矽卡岩石榴子石 Tera-Wasserburg 等时线年龄 407.7±5.1 Ma，2组年龄在误差范围内基本吻合，证明早−中泥盆世同步发育岩浆活动与铁多金属矿化。岩石地球化学特征显示两期岩体均属高钾钙碱性系列，晚三叠世岩体为准铝质−弱过铝质，泥盆世花岗闪长岩受成矿流体蚀变钠大量流失，呈强过铝质特征。两期岩浆源区均表现为壳幔混源：原始岩浆来自岩石圈地幔部分熔融，上升运移过程混染地壳物质。2期岩浆分属不同构造阶段：泥盆世岩体形成于原特提斯洋闭合、陆块碰撞后的后碰撞伸展环境，晚三叠世岩体形成于古特提斯洋俯冲结束后的板块内伸展背景。年代学与地球化学数据证实，野马泉铁多金属矿床记录早−中泥盆世、晚三叠世2期岩浆侵入活动，分别诱发2期独立矽卡岩型铁铜铅锌成矿作用。研究成果完善祁漫塔格成矿演化理论，为区域内两期侵入岩相关多金属矿产勘查提供重要理论依据与找矿方向。
- 矿床学 /
- 花岗岩 /
- U-Pb定年 /
- Hf同位素 /
- 岩石成因 /
- 祁漫塔格
Abstract:
Objective
The Qimantag area in Qinghai Province is located on the southern margin of the Qaidam Basin and belongs to the East Kunlun metallogenic belt. Extensive Late Paleozoic to Mesozoic magmatic activities are developed in this region, producing numerous Fe-Cu-Pb-Zn polymetallic deposits, such as Hutouya, Kaerqueka, and Niukutou. Previous studies have confirmed that most deposits in this belt record two episodes of magmatism and mineralization. The Yemaquan deposit is a typical skarn-type Fe-polymetallic systems in the Qimantag area. Previous studies have focused only on the Late Triassic granite-skarn metallogenic system of this deposit. Triassic magmatism has generally been considered the sole controlling factor for mineralization. The metallogenic potential of Devonian intrusive rocks lacks chronological and geochemical constraints. Whether two independent magmatic-mineralization episodes occurred in the Yemaquan deposit has long remained controversial. To resolve this scientific issue, this study systematically constrains the timing, magma source, and geodynamic setting of two episodes of intrusions and associated skarn mineralization.
Methods
This study focused on the Late Triassic intrusive rocks in the western Yemaquan deposit, the Devonian granodiorite from deep drill cores in the M13 magnetic anomaly zone in the southeast, and garnet from skarn in the contact zone. Field geological mapping and petrographic microscopic identification were conducted. Zircon and garnet LA-ICP-MS U-Pb dating, whole-rock major- and trace-element analysis, and in situ Lu-Hf isotope analysis of zircon were also conducted to systematically constrain the formation ages, magma sources, and tectonic settings of the two episodes of intrusive rocks.
Results
Zircon ²⁰⁶Pb/²³⁸U U-Pb dating yielded consistent weighted average ages of 223.4-225.0 Ma (MSWD=1.7-2.4) for diorite, monzogranite, and K-feldspar granite from the southwestern part of the deposit. The ages were highly consistent with the mica Ar-Ar mineralization age of 222±1.3 Ma from the deposit, constraining the timing of Late Triassic magmatism and associated skarn mineralization. Deep granodiorite samples from the M13 zone yielded zircon ages of 392.0-392.8 Ma, whereas garnet from the skarn yielded a Tera-Wasserburg isochron age of 407.7±5.1 Ma. The two sets of ages were basically consistent within the error range, demonstrating the synchronous development of magmatic activity and Fe-polymetallic mineralization during the Early-Middle Devonian. Whole-rock geochemistry analyses indicate that both intrusive suites belonged to the high-K calc-alkaline series. The Late Triassic rocks were metaluminous to weakly peraluminous, whereas the Devonian granodiorite underwent intense hydrothermal alteration and severe Na loss, resulting in strongly peraluminous characteristics. Both intrusive had crust-mantle mixed magma sources: The primary magmas originated from partial melting of lithospheric mantle and experienced crustal material assimilation during upward migration. The two magmatic episodes formed during different tectonic stages. The Devonian intrusions formed in a post-collisional extensional setting after the closure of Proto-Tethys Ocean and continental block collision, whereas the Late Triassic intrusions formed in an intraplate extensional setting after the termination of Paleo-Tethys Ocean subduction. Integrated geochronological and geochemical data demonstrated that the Yemaquan Fe-polymetallic deposit recorded two episodes of magmatic intrusion in the Early-Middle Devonian and Late Triassic, respectively, which triggered two independent episodes of skarn-type Fe-Cu-Pb-Zn mineralization. This study first identified the Devonian skarn mineralization event in the Yemaquan ore field and revised the conventional understanding that only Triassic mineralization occurred in the deposit.
Conclusion
The findings improve the metallogenic evolution theory of the Qimantag belt, providing important theoretical foundations and exploration directions for targeting two phases of intrusive rock-related polymetallic deposits in this region.
- economic geology /
- granite /
- U-Pb dating /
- Hf isotope /
- petrogenesis /
- Qimantag

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图 1 东昆仑造山带构造划分图(a)和祁漫塔格地区地质简图(b)（据文献[3-4]修改）

Figure 1. Tectonic division map of East Kunlun orogenic belt (a) and geological schematic map of Qimantag area (b)

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图 2 野马泉铁多金属矿床矿区地质简图（矿床位置见图1b；据文献[7，12]修改）

Figure 2. Geological schematic map of Yemaquan Fe-polymetallic deposit

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图 3 野马泉铁多金属矿床典型勘探线剖面图

样品YM057金云母 Ar-Ar年龄为222±1.3 Ma，取样位置见图3b；A-A'和B-B'剖面位置、M13和M5磁异常区位置见图2，据文献[14]修改

Figure 3. Typical exploration line profiles of Yemaquan Fe-polymetallic deposit

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图 4 野马泉矿床侵入岩代表性手标本照片

a. 晚三叠世闪长岩，B-0281-1；b. 晚三叠世黑云母二长花岗岩，B-0218；c. 晚三叠世黑云母正长花岗岩，B-0215-2；d. 早−中泥盆世花岗闪长岩，B-10429-1。Bt. 黑云母；Hbl. 角闪石；Kfs. 钾长石；Pl. 斜长石；Qtz. 石英；下同

Figure 4. Representative hand specimen photographs of intrusive rocks from Yemaquan deposit

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图 5 野马泉矿区侵入岩代表性镜下显微照片

a～c. 晚三叠世细粒闪长岩；d～f. 晚三叠世中细粒黑云母二长花岗岩；g～i. 晚三叠世细粒黑云母正长花岗岩；j～l. 早−中泥盆世蚀变细粒花岗闪长岩。Cal. 方解石；Kln. 高岭石；Ser. 绢云母；Srp. 蛇纹石；Om. 不透明矿物

Figure 5. Representative micrographs of intrusive rocks from Yemaquan deposit

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图 6 野马泉矿区侵入岩定年样品典型锆石阴极发光（CL）图像

红色圆圈为 U-Pb 定年测点，激光束斑直径 32 μm；蓝色圆圈为原位 Hf 同位素测点，激光束斑直径 44 μm；数字5，6，8等为锆石测点号；数字225.8 Ma等为单点²⁰⁶Pb/²³⁸U年龄

Figure 6. Cathodoluminescence (CL) images of representative zircons from dating samples of intrusive rocks in Yemaquan deposit

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图 7 野马泉矿区晚三叠世侵入岩锆石 LA-ICP-MS U-Pb 谐和年龄图

n为样品数据点数量；MSWD为加权偏差均方；下同

Figure 7. LA-ICP-MS zircon U-Pb concordia diagrams of Late Triassic intrusive rocks from Yemaquan deposit

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图 8 野马泉矿区早−中泥盆世侵入岩锆石 LA-ICP-MS U-Pb 谐和年龄图

Figure 8. Zircon LA-ICP-MS U-Pb concordia diagrams of Early-Middle Devonian intrusive rocks from Yemaquan deposit

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图 9 野马泉矿区石榴子石 Tera-Wasserburg 等时线图解(a)与典型石榴子石阴极发光（CL）图像(b)

图a虚线为数据样品拟合等时线，绿色圆圈为样品数据（含误差）；图b红色圆圈为 U-Pb 定年测点，激光束斑直径 20 μm

Figure 9. Tera-Wasserburg isochron diagram (a) and cathodoluminescence (CL) images of representative garnet samples (b) from Yemaquan deposit

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图 10 野马泉矿区侵入岩岩石分类图解（a图修改自文献[26]）

Figure 10. Rock classification diagrams of intrusive rocks from Yemaquan deposit

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图 11 野马泉矿区侵入岩球粒陨石标准化稀土元素配分图(a, c)及原始地幔标准化微量元素蜘蛛网图(b, d)（标准化值据文献[27]）

Figure 11. Chondrite-normalized rare earth element patterns (a, c) and primitive-mantle-normalized variation spidergrams of intrusive rocks from Yemaquan deposit

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图 12 祁漫塔格地区典型矿床成岩-成矿年龄统计图^{[3-4，33-51]}

Figure 12. Statistical diagram of magmatic and metallogenic ages of typical deposits in Qimantagh area^{[3–4，33–51]}

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图 13 野马泉矿区侵入岩Harker图解

Figure 13. Harker diagrams of intrusive rocks from Yemaquan deposit

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图 14 野马泉矿区侵入岩锆石ε_Hf(t)-年龄图解（底图修改自文献[65]）

Figure 14. ε_Hf(t) -age diagrams of intrusive rocks from Yemaquan deposit

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图 15 野马泉矿区侵入岩构造环境判别图

a. 花岗质岩石Ta-Yb构造环境判别图^[64]；b. Rb-Y+Nb构造环境判别图^[64]；c. 花岗质岩石Rb/10-Hf-Ta×3判别图^[65]；d. R2-R1花岗岩构造环境判别图解^[66]。R1=4Si−11(Na+K)−2(Fe+Ti)，R2=6Ca+2Mg+Al，式中元素符号代表分子中相应元素原子数量；①地幔斜长花岗岩；②破坏性活动板块边缘(板块碰撞前)花岗岩；③板块碰撞后隆起期花岗岩；④晚造期花岗岩；⑤非造山区A型花岗岩；⑥同碰撞（S型）花岗岩；⑦造山期后A型花岗岩

Figure 15. Discrimination diagrams of tectonic settings of intrusive rocks from Yemaquan deposit

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表 1 野马泉侵入岩锆石U-Pb数据统计

Table 1. Statistics of zircon U–Pb data for intrusive rocks from Yemaquan deposit

测点号	U	Th	Th/U	同位素比值						年龄/Ma
测点号	w_B/10⁻⁶		Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ（2σ）	²⁰⁷Pb/²³⁵U	1σ（2σ）	²⁰⁶Pb/²³⁸U	1σ（2σ）	²⁰⁶Pb/²³⁸U	1σ（2σ）
B-0281-1
1	886	344	0.39	0.0499	0.0013	0.2415	0.0061	0.0350	0.0003	222	2
2	826	276	0.33	0.0493	0.0012	0.2484	0.0063	0.0365	0.0003	231	2
3	861	305	0.35	0.0518	0.0012	0.2557	0.0059	0.0357	0.0003	226	2
5	635	251	0.40	0.0523	0.0015	0.2576	0.0072	0.0356	0.0003	226	2
6	563	207	0.37	0.0492	0.0015	0.2390	0.0076	0.0350	0.0003	222	2
7	845	290	0.34	0.0481	0.0013	0.2324	0.0063	0.0349	0.0003	221	2
8	524	184	0.35	0.0527	0.0017	0.2552	0.0085	0.0349	0.0003	221	2
9	759	263	0.35	0.0486	0.0013	0.2356	0.0058	0.0352	0.0003	223	2
10	551	233	0.42	0.0499	0.0012	0.2458	0.0060	0.0356	0.0003	225	2
11	1023	457	0.45	0.0543	0.0012	0.2690	0.0065	0.0357	0.0003	226	2
12	703	219	0.31	0.0478	0.0013	0.2333	0.0064	0.0352	0.0003	223	2
13	666	217	0.33	0.0533	0.0014	0.2575	0.0069	0.0349	0.0003	221	2
15	921	344	0.37	0.0533	0.0012	0.2654	0.0061	0.0360	0.0003	228	2
16	768	274	0.36	0.0525	0.0011	0.2629	0.0058	0.0362	0.0003	229	2
17	947	565	0.60	0.0501	0.0011	0.2476	0.0056	0.0357	0.0003	226	2
18	696	202	0.29	0.0527	0.0015	0.2638	0.0076	0.0362	0.0004	229	2
19	953	403	0.42	0.0501	0.0012	0.2456	0.0058	0.0354	0.0003	224	2
20	746	247	0.33	0.0536	0.0013	0.2671	0.0069	0.0361	0.0004	229	2
21	878	307	0.35	0.0513	0.0012	0.2515	0.0059	0.0355	0.0003	225	2
22	1139	485	0.43	0.0528	0.0012	0.2564	0.0061	0.0351	0.0003	222	2
23	993	346	0.35	0.0506	0.0012	0.2517	0.0063	0.0360	0.0004	228	2
24	952	346	0.36	0.0506	0.0013	0.2541	0.0066	0.0363	0.0004	230	2
B-0218
1	762	530	0.70	0.0511	0.0012	0.2454	0.0055	0.0348	0.0002	220	1
2	672	455	0.68	0.0499	0.0028	0.2456	0.0142	0.0353	0.0004	224	3
3	174	72.2	0.42	0.0504	0.0024	0.2403	0.0110	0.0347	0.0004	220	2
4	1034	728	0.70	0.0500	0.0010	0.2411	0.0049	0.0349	0.0003	221	2
5	1143	502	0.44	0.0490	0.0021	0.2382	0.0097	0.0353	0.0003	224	2
6	891	544	0.61	0.0543	0.0013	0.2617	0.0061	0.0350	0.0002	222	2
7	649	221	0.34	0.0501	0.0012	0.2454	0.0061	0.0354	0.0003	224	2
8	708	324	0.46	0.0504	0.0012	0.2426	0.0056	0.0349	0.0003	221	2
9	990	448	0.45	0.0503	0.0020	0.2438	0.0104	0.0347	0.0003	220	2
11	855	463	0.54	0.0506	0.0011	0.2474	0.0052	0.0354	0.0003	224	2
12	210	89.5	0.43	0.0530	0.0023	0.2614	0.0112	0.0359	0.0005	227	3
13	862	542	0.63	0.0482	0.0018	0.2365	0.0086	0.0355	0.0002	225	2
14	504	238	0.47	0.0551	0.0019	0.2763	0.0078	0.0361	0.0004	228	2
15	1064	372	0.35	0.0508	0.0010	0.2475	0.0049	0.0352	0.0003	223	2
17	537	316	0.59	0.0530	0.0013	0.2589	0.0067	0.0353	0.0004	224	2
18	1026	769	0.75	0.0482	0.0019	0.2381	0.0103	0.0353	0.0004	224	2
19	632	310	0.49	0.0530	0.0016	0.2647	0.0085	0.0361	0.0003	228	2
20	1067	682	0.64	0.0485	0.0011	0.2391	0.0058	0.0357	0.0004	226	3
21	900	485	0.54	0.0502	0.0014	0.2476	0.0065	0.0359	0.0003	228	2
22	209	80.5	0.39	0.0566	0.0022	0.2825	0.0110	0.0363	0.0004	230	3
23	1185	437	0.37	0.0483	0.0018	0.2321	0.0085	0.0348	0.0002	220	2
25	565	262	0.46	0.0474	0.0031	0.2335	0.0187	0.0346	0.0005	219	3
26	935	336	0.36	0.0496	0.0013	0.2438	0.0064	0.0357	0.0003	226	2
B-0215-2
6	836	273	0.33	0.0513	0.0011	0.2468	0.0052	0.0348	0.0003	220	2
19	1024	346	0.34	0.0500	0.0010	0.2404	0.0047	0.0349	0.0003	221	2
12	799	264	0.33	0.0521	0.0011	0.2526	0.0057	0.0350	0.0003	222	2
14	1232	380	0.31	0.0528	0.0011	0.2559	0.0051	0.0350	0.0003	222	2
23	990	330	0.33	0.0504	0.0011	0.2442	0.0055	0.0351	0.0003	222	2
21	807	244	0.30	0.0497	0.0010	0.2422	0.0049	0.0353	0.0003	223	2
17	789	238	0.30	0.0507	0.0010	0.2481	0.0052	0.0353	0.0003	224	2
24	934	306	0.33	0.0498	0.0012	0.2427	0.0056	0.0354	0.0003	224	2
13	491	198	0.40	0.0494	0.0013	0.2421	0.0060	0.0355	0.0003	225	2
3	715	214	0.30	0.0524	0.0012	0.2580	0.0061	0.0356	0.0003	225	2
22	1772	434	0.24	0.0523	0.0010	0.2579	0.0056	0.0356	0.0003	226	2
30	750	300	0.40	0.0513	0.0012	0.2534	0.0058	0.0357	0.0003	226	2
26	527	184	0.35	0.0527	0.0013	0.2599	0.0065	0.0357	0.0003	226	2
15	745	216	0.29	0.0509	0.0012	0.2517	0.0061	0.0357	0.0003	226	2
28	724	192	0.27	0.0497	0.0011	0.2457	0.0057	0.0357	0.0003	226	2
8	759	223	0.29	0.0506	0.0012	0.2508	0.0060	0.0358	0.0003	227	2
16	683	178	0.26	0.0526	0.0013	0.2616	0.0062	0.0359	0.0003	227	2
27	1091	469	0.43	0.0495	0.0010	0.2466	0.0051	0.0360	0.0003	228	2
B-0270-1
1	287	153	0.53	0.0516	0.0085	0.4753	0.0809	0.0639	0.0028	399	17
2	399	338	0.84	0.0534	0.0079	0.4506	0.0636	0.0619	0.0026	386	16
3	373	283	0.76	0.0643	0.0096	0.5544	0.0796	0.0615	0.0022	386	13
4	241	121	0.50	0.0509	0.0086	0.3961	0.0635	0.0612	0.0027	382	16
5	304	175	0.59	0.0554	0.0087	0.4476	0.0623	0.0596	0.0027	373	16
6	287	229	0.81	0.0477	0.0076	0.4161	0.0650	0.0616	0.0023	385	14
7	359	222	0.63	0.0543	0.0071	0.5002	0.0663	0.0613	0.0019	383	11
8	244	155	0.63	0.0557	0.0087	0.4852	0.0723	0.0611	0.0022	382	14
9	385	243	0.64	0.0557	0.0069	0.5068	0.0620	0.0620	0.0019	387	12
10	270	202	0.75	0.0482	0.0071	0.4320	0.0610	0.0646	0.0029	403	17
11	222	163	0.70	0.0562	0.0092	0.4960	0.0802	0.0625	0.0029	390	18
12	240	163	0.66	0.0510	0.0081	0.4701	0.0738	0.0634	0.0024	396	14
13	264	195	0.74	0.0508	0.0080	0.4717	0.0685	0.0654	0.0023	408	14
14	520	429	0.82	0.0547	0.0054	0.5069	0.0504	0.0645	0.0022	402	13
15	320	209	0.65	0.0593	0.0086	0.5129	0.0696	0.0637	0.0023	398	14
16	343	235	0.69	0.0513	0.0073	0.4836	0.0711	0.0651	0.0023	406	14
17	292	241	0.81	0.0572	0.0077	0.5063	0.0655	0.0650	0.0027	405	16
18	476	196	0.38	0.0540	0.0060	0.4391	0.0469	0.0584	0.0019	367	12
19	293	173	0.61	0.0452	0.0072	0.3993	0.0604	0.0655	0.0026	411	16
20	148	76	0.52	0.0592	0.0124	0.5679	0.1226	0.0671	0.0031	418	19
21	277	268	0.97	0.0544	0.0072	0.4922	0.0650	0.0647	0.0025	403	15
22	524	315	0.62	0.0514	0.0057	0.4820	0.0557	0.0638	0.0020	398	12
23	257	150	0.57	0.0480	0.0092	0.4191	0.0763	0.0609	0.0026	380	16
24	246	169	0.68	0.0472	0.0078	0.4017	0.0634	0.0629	0.0026	393	16
25	183	108	0.59	0.0589	0.0107	0.4768	0.0781	0.0619	0.0028	386	17
B-10429-1
1	377	280	0.74	0.0527	0.0015	0.4531	0.0125	0.0623	0.0005	389	3
2	380	318	0.84	0.0552	0.0018	0.4732	0.0158	0.0619	0.0006	387	4
3	446	385	0.86	0.0549	0.0013	0.4736	0.0117	0.0623	0.0006	389	3
4	287	187	0.65	0.0525	0.0015	0.4531	0.0130	0.0624	0.0005	390	3
5	324	237	0.73	0.0550	0.0014	0.4874	0.0127	0.0640	0.0006	400	4
6	376	256	0.68	0.0558	0.0015	0.4785	0.0129	0.0619	0.0006	387	4
7	204	145	0.71	0.0533	0.0019	0.4600	0.0158	0.0626	0.0006	392	3
8	336	258	0.77	0.0533	0.0014	0.4628	0.0122	0.0626	0.0005	392	3
9	234	120	0.51	0.0536	0.0017	0.4750	0.0154	0.0640	0.0006	400	3
10	356	224	0.63	0.0533	0.0012	0.4698	0.0105	0.0636	0.0005	398	3
11	270	175	0.65	0.0529	0.0015	0.4638	0.0135	0.0632	0.0007	395	4
13	269	178	0.66	0.0518	0.0015	0.4456	0.0132	0.0620	0.0006	388	4
14	218	134	0.61	0.0545	0.0018	0.4694	0.0149	0.0621	0.0006	388	4
16	381	234	0.61	0.0565	0.0015	0.5002	0.0132	0.0636	0.0005	397	3
17	414	335	0.81	0.0552	0.0016	0.4828	0.0140	0.0629	0.0006	394	4
20	236	121	0.51	0.0528	0.0016	0.4680	0.0146	0.0640	0.0007	400	4
21	232	104	0.45	0.0531	0.0017	0.4641	0.0145	0.0632	0.0006	395	4
22	214	133	0.62	0.0542	0.0016	0.4702	0.0134	0.0630	0.0006	394	3
23	278	157	0.57	0.0537	0.0017	0.4695	0.0145	0.0635	0.0007	397	4
24	396	277	0.70	0.0561	0.0015	0.4892	0.0135	0.0631	0.0006	394	4
25	483	446	0.92	0.0533	0.0014	0.4576	0.0126	0.0620	0.0006	388	3
26	395	277	0.70	0.0546	0.0015	0.4645	0.0121	0.0617	0.0005	386	3
27	192	126	0.66	0.0543	0.0017	0.4810	0.0156	0.0640	0.0007	400	4
28	257	155	0.60	0.0542	0.0016	0.4809	0.0135	0.0643	0.0006	402	3
29	266	151	0.57	0.0573	0.0017	0.4946	0.0154	0.0622	0.0006	389	3
30	309	267	0.86	0.0568	0.0017	0.4915	0.0141	0.0626	0.0006	391	4
注：除样品 B-0270-1 测试误差为 2σ 外，其余测点同位素比值与年龄误差均为 1σ，其中2σ 为2倍标准偏差，1σ 为1倍标准偏差，下同

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表 2 野马泉矿床石榴子石U-Pb数据统计（B-7609-201）

Table 2. Statistics of garnet U–Pb data from Yemaquan deposit

测点号	U	Th	Pb	Th/U	同位素比值
测点号	w_B/10⁻⁶			Th/U	²⁰⁷Pb/²⁰⁶Pb	2σ	²⁰⁷Pb/²³⁵U	2σ	²⁰⁶Pb/²³⁸U	2σ
1	4.57	0.86	0.06	0.19	0.0698	0.0071	0.6920	0.0697	0.0730	0.0028
2	4.51	0.73	0.08	0.15	0.0824	0.0071	0.8552	0.0853	0.0715	0.0028
3	5.08	0.96	0.08	0.18	0.0591	0.0054	0.5885	0.0545	0.0713	0.0027
4	3.50	0.89	0.06	0.24	0.0853	0.0094	0.8922	0.0988	0.0757	0.0035
5	8.95	0.28	0.04	0.03	0.0660	0.0039	0.6353	0.0386	0.0696	0.0023
6	1.06	0.08	0.39	0.10	0.3550	0.0462	12.3033	3.7368	0.1707	0.0334
7	0.91	0.25	0.07	0.25	0.2102	0.0219	2.4746	0.2302	0.0931	0.0061
8	3.49	0.81	0.09	0.23	0.0928	0.0113	0.8686	0.1004	0.0751	0.0033
9	3.88	0.88	0.07	0.22	0.0804	0.0145	0.8420	0.1312	0.0785	0.0047
11	6.88	0.09	0.06	0.01	0.0878	0.0095	0.8958	0.0947	0.0755	0.0025
12	4.64	0.07	0.02	0.02	0.0637	0.0054	0.6458	0.0555	0.0739	0.0027
13	10.08	0.14	0.03	0.01	0.0614	0.0037	0.6553	0.0436	0.0766	0.0028
14	4.31	1.76	0.08	0.41	0.0627	0.0056	0.6046	0.0532	0.0705	0.0031
15	3.98	0.68	0.03	0.16	0.0712	0.0058	0.6770	0.0562	0.0706	0.0026
16	3.75	0.78	0.04	0.20	0.0733	0.0066	0.7433	0.0690	0.0727	0.0032
17	5.70	0.24	0.03	0.04	0.0696	0.0061	0.6334	0.0540	0.0695	0.0026
18	4.26	0.04	0.02	0.02	0.0744	0.0056	0.7345	0.0569	0.0704	0.0028
19	5.32	0.95	0.04	0.17	0.0566	0.0050	0.5536	0.0475	0.0739	0.0027
20	7.40	0.15	0.04	0.02	0.0636	0.0046	0.6050	0.0441	0.0717	0.0025
21	4.28	0.72	0.04	0.16	0.0656	0.0058	0.6632	0.0586	0.0711	0.0028
22	4.53	1.55	0.13	0.33	0.1210	0.0134	1.2015	0.1440	0.0724	0.0027
23	5.61	0.76	0.03	0.13	0.0589	0.0047	0.5540	0.0419	0.0681	0.0025
24	4.83	0.63	0.13	0.13	0.1213	0.0124	1.3053	0.1492	0.0784	0.0033
25	4.65	0.81	0.06	0.17	0.0671	0.0056	0.6591	0.0546	0.0716	0.0026
26	1.81	0.19	0.04	0.10	0.1046	0.0128	1.1564	0.1521	0.0799	0.0044
27	2.45	0.06	0.02	0.03	0.0601	0.0069	0.6279	0.0697	0.0743	0.0034
28	4.88	0.68	0.03	0.14	0.0611	0.0060	0.6022	0.0580	0.0720	0.0027
29	2.93	0.07	0.02	0.03	0.0822	0.0095	0.8045	0.0965	0.0698	0.0036
30	6.36	0.08	0.00	0.01	0.0627	0.0047	0.6266	0.0512	0.0720	0.0025

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表 3 野马泉侵入岩锆石Hf同位素分析结果

Table 3. Results of zircon Hf isotopic analysis of intrusive rocks from Yemaquan deposit

测点号	年龄/Ma	¹⁷⁶Yb/¹⁷⁷Hf	2σ	¹⁷⁶Lu/¹⁷⁷Hf	2σ	¹⁷⁶Hf/¹⁷⁷Hf	2σ	ε_Hf(t)	T_DM/Ma	T_DM2/Ma	f_Lu/Hf
B-0281-1
1	226	0.029772	0.000408	0.000925	0.000009	0.282659	0.000020	+0.81	838	1207	0.97
2	222	0.039331	0.001460	0.001258	0.000051	0.282638	0.000023	+0.03	876	1258	0.96
3	221	0.022691	0.000268	0.000772	0.000015	0.282620	0.000025	−0.54	889	1293	0.98
4	223	0.022405	0.000185	0.000720	0.000004	0.282625	0.000021	−0.36	881	1281	0.98
5	226	0.026285	0.000082	0.000844	0.000003	0.282618	0.000020	−0.65	894	1299	0.97
B-0218
1	220	0.033882	0.000075	0.001011	0.000006	0.282558	0.000022	−2.84	983	1437	0.97
2	224	0.043455	0.000670	0.001248	0.000019	0.282651	0.000021	+0.45	856	1228	0.96
3	220	0.023022	0.000163	0.000696	0.000003	0.282628	0.000024	−0.29	876	1275	0.98
4	221	0.053715	0.000682	0.001613	0.000017	0.282620	0.000023	−0.72	910	1303	0.95
5	220	0.035524	0.000617	0.001199	0.000017	0.282592	0.000019	−1.64	939	1361	0.96
B-0215-2
1	216	0.026951	0.000283	0.000863	0.000005	0.282645	0.000020	+0.30	857	1239	0.97
2	218	0.025873	0.000142	0.000837	0.000005	0.282623	0.000021	−0.45	886	1286	0.97
3	216	0.039589	0.000127	0.001305	0.000002	0.282595	0.000023	−1.54	938	1356	0.96
4	227	0.030633	0.000228	0.000978	0.000001	0.282639	0.000019	+0.08	867	1252	0.97
5	225	0.036501	0.000206	0.001151	0.000003	0.282647	0.000024	+0.33	860	1236	0.97
B-0270-1
1	399	0.043899	0.000694	0.001510	0.000031	0.282669	0.000025	+4.60	837	1094	0.95
2	386	0.033875	0.001317	0.001133	0.000038	0.282585	0.000023	+1.73	947	1276	0.97
3	382	0.048835	0.000266	0.001714	0.000018	0.282681	0.000022	+4.95	824	1069	0.95
4	382	0.065845	0.000565	0.002199	0.000013	0.282569	0.000026	+0.88	998	1330	0.93
5	387	0.058998	0.000219	0.001985	0.000014	0.282584	0.000023	+1.48	970	1291	0.94
B-10429-1
1	389	0.045250	0.000640	0.001510	0.000017	0.282689	0.000022	+5.32	808	1047	0.95
2	387	0.035211	0.000845	0.001197	0.000022	0.282674	0.000024	+4.86	823	1077	0.96
3	389	0.045561	0.000894	0.001512	0.000027	0.282603	0.000020	+2.28	931	1241	0.95
4	392	0.041576	0.000472	0.001371	0.000010	0.282662	0.000027	+4.40	843	1105	0.96
5	392	0.048178	0.001143	0.001614	0.000029	0.282668	0.000022	+4.58	840	1096	0.95
注： ε_Hf(t)为锆石结晶时Hf同位素组成相对于同时代的球粒陨石的偏差程度；t为年龄；T_DM为亏损地幔一阶段模式年龄；T_DM2为亏损地幔二阶段模式年龄；f_Lu/Hf为描述岩石或矿物中Lu/Hf比值相对于球粒陨石的偏差程度

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表 4 野马泉矿床侵入岩主量、微量元素

Table 4. Major and trace elements of intrusive rocks from Yemaquan deposit

样品号		B-0215-3	B-0217-2	B-0215-2	B-0281-3	B-0284	B-0218	B-0281-2	B-0281-1	B-0286	B-0286-2	B-0217-1	B-5661-1	B-0270-1	B-11212-1	B-10429-1	B-1009-1
岩性		三叠纪正长花岗岩			三叠纪二长花岗岩				三叠纪闪长岩				泥盆纪花岗闪长岩
SiO₂	w_B/%	74.94	75.37	73.09	73.10	73.20	73.74	74.86	64.49	68.69	68.87	67.55	72.71	72.38	66.52	71.49	67.68
TiO₂		0.15	0.12	0.20	0.21	0.18	0.20	0.15	0.62	0.37	0.37	0.57	0.32	0.32	0.47	0.27	0.38
Al₂O₃		13.36	12.89	14.28	13.93	13.47	13.61	13.04	15.74	15.22	15.26	16.08	13.89	13.89	16.21	14.35	15.49
TFe₂O₃		0.81	1.08	1.18	1.91	1.97	1.60	1.51	5.06	3.11	3.12	2.56	0.73	0.74	4.28	2.46	5.25
MnO		0.01	0.02	0.03	0.04	0.04	0.02	0.04	0.13	0.07	0.07	0.03	0.02	0.02	0.11	0.03	0.11
MgO		0.19	0.23	0.38	0.39	0.34	0.74	0.24	1.51	0.58	0.57	0.83	1.30	1.29	1.67	0.87	1.52
CaO		1.59	1.12	2.32	1.50	1.18	1.32	1.06	3.71	1.93	1.93	2.60	2.12	2.11	2.04	1.41	0.31
Na₂O		3.47	3.29	4.19	3.81	3.62	4.23	3.53	4.10	4.67	4.69	3.84	3.46	3.40	0.50	0.09	0.07
K₂O		4.68	4.75	3.76	4.55	4.97	2.97	4.83	3.25	4.26	4.27	4.68	4.56	4.58	4.40	4.36	4.65
P₂O₅		0.04	0.04	0.07	0.06	0.06	0.05	0.04	0.19	0.11	0.11	0.13	0.09	0.09	0.12	0.07	0.11
烧失量		0.72	0.55	0.37	0.47	0.38	0.87	0.37	0.60	0.58	0.54	0.67	0.75	0.72	3.07	4.05	4.07
总量		99.97	99.45	99.86	99.95	99.41	99.36	99.65	99.39	99.59	99.80	99.55	99.94	99.55	99.37	99.45	99.63
La	w_B/10⁻⁶	34.7	30.9	34.2	27.5	35.8	20.0	32.0	36.9	39.9	46.8	39.6	80.7	83.1	28.5	24.6	33.7
Ce		64.9	55.2	65.1	54.3	65.4	39.0	57.0	72.8	75.8	86.4	78.6	148	149	51.7	45.3	65.6
Pr		6.67	5.88	6.65	5.67	6.84	4.11	5.63	8.09	8.54	8.95	8.58	14.7	15.4	5.37	4.68	6.51
Nd		21.7	18.6	21.0	18.6	22.5	13.8	18.0	28.9	31.9	28.5	30.3	43.2	43.6	17.8	15.9	21.5
Sm		4.01	3.30	3.69	3.27	4.09	2.78	3.03	5.36	5.11	4.33	5.65	5.82	5.99	3.20	2.92	3.71
Eu		0.40	0.36	0.36	0.60	0.48	0.57	0.60	1.16	1.09	0.87	1.24	0.81	0.82	0.91	0.77	0.90
Gd		3.36	2.56	2.91	2.64	3.43	2.35	2.45	4.39	4.03	3.15	4.55	4.10	4.10	2.68	2.61	2.94
Tb		0.60	0.42	0.48	0.44	0.57	0.38	0.41	0.69	0.62	0.45	0.71	0.59	0.60	0.40	0.40	0.46
Dy		3.63	2.39	2.76	2.37	3.43	2.14	2.28	3.77	3.37	2.28	4.05	3.13	3.13	2.03	2.29	2.45
Ho		0.74	0.52	0.58	0.51	0.70	0.45	0.50	0.76	0.68	0.46	0.83	0.62	0.64	0.40	0.47	0.49
Er		2.34	1.55	1.78	1.57	2.19	1.22	1.47	2.16	1.98	1.36	2.40	1.83	1.88	1.21	1.39	1.39
Tm		0.39	0.25	0.29	0.25	0.35	0.19	0.24	0.33	0.31	0.21	0.38	0.29	0.30	0.19	0.21	0.21
Yb		2.76	1.79	2.08	1.73	2.51	1.30	1.72	2.20	2.09	1.49	2.57	1.98	2.03	1.37	1.49	1.51
Lu		0.43	0.29	0.34	0.26	0.40	0.21	0.28	0.33	0.50	0.22	0.41	0.31	0.31	0.23	0.23	0.24
Y		24.3	16.6	19.0	16.1	22.8	14.1	16.0	22.8	14.5	14.5	24.8	19.3	19.4	13.3	15.4	14.8
ΣREE		146.55	124.08	142.22	119.74	148.69	88.57	125.61	167.82	190.4	185.49	179.99	305.97	310.59	116.03	103.21	141.64
Rb		214	221	173	174	156	87.2	217	179	182	152	217	158	160	191	169	189
Ba		387	338	523	410	465	519	311	689	692	778	1012	796	806	442	547	390
Th		38.1	27.7	26.9	36.0	20.2	14.7	37.7	14.6	18	15.4	19.1	26.0	27.4	10.8	13.0	10.2
U		6.37	4.74	3.58	5.61	3.23	1.93	4.58	3.65	7	3.33	4.24	4.46	4.56	1.23	0.80	0.98
Nb		21.0	13.4	11.1	17.6	11.5	6.78	16.4	12.5	15	24.3	18.0	7.70	7.71	8.56	6.32	7.04
Sr		192	137	189	150	319	176	113	330	333	274	288	274	274	53.3	39.5	17.8
Zr		166	144	155	165	184	102	137	185	188	305	448	128	132	155	124	128
Hf		5.56	4.70	4.54	5.39	4.98	3.59	4.54	5.09	8	7.56	11.4	4.38	4.38	4.56	3.97	3.82

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