扬子地块西缘乌蒙山地区早白垩世橄榄玄武玢岩的发现及其对陆缘碰撞造山事件陆内响应的启示

张宏辉; 袁永盛; 李致伟; 谢财富; 张七道; 陈贵仁; 吴亮; 朱利东; 潘江涛; 李仕忠; 胡关云; 张沥元

doi:10.12097/gbc.2023.01.021

扬子地块西缘乌蒙山地区早白垩世橄榄玄武玢岩的发现及其对陆缘碰撞造山事件陆内响应的启示

1.
中国地质调查局昆明自然资源综合调查中心, 云南昆明 650111

2.
自然资源部自然生态系统碳汇工程技术创新中心, 云南昆明 650111

3.
东华理工大学地球科学学院, 江西南昌 330013

4.
成都理工大学沉积地质研究院, 四川成都 610059

5.
中国地质调查局地球物理调查中心, 河北廊坊 065000

基金项目: 自然资源综合调查指挥中心科创基金《滇东北峨眉山地幔柱活动与地表系统响应之间的耦合关系》（编号：KC20230020）、中国地质调查局项目《滇中楚雄地区云龙镇等4幅1∶5万区域地质调查》（编号：DD20220987）及《云南乌蒙山区1∶5万瓦岗等9幅区域地质调查》（编号：DD20191012-01）

详细信息

作者简介: 张宏辉（1989− ），男，硕士，高级工程师，从事区域地质调查工作。E−mail：673872084@qq.com

通讯作者: 张七道（1987− ），男，硕士，高级工程师，从事区域地质矿产调查工作。E−mail：506676421@qq.com

中图分类号: P534.53; P588.12

收稿日期: 2023-01-13

修回日期: 2023-06-21

刊出日期: 2025-03-15

The discovery of the Early Cretaceous olive basaltic porphyrite in the Wumengshan area on the western margin of the Yangtze block and its implications for the intracontinental response to the continental margin collision orogenic event

1.
Kunming General Survey of Natural Resources Center of China Geological Survey, Kunming 650111, Yunnan, China

2.
Technology Innovation Center for Natural Ecosystem Carbon Sink, Ministry of Natural Resources, Kunming 650111, Yunnan, China

3.
School of Earth Sciences , East China University of Technology, Nanchang 330013, Jiangxi, China

4.
Institute of Sedmentary, Chengdu University of Technology, Chengdu 610059, Sichuan, Chian

5.
Geophysical Investigation Center of China Geological Survey, Langfang 065000, Hebei, China

More Information

Corresponding author: ZHANG Qidao, 506676421@qq.com

Received Date: 13 January 2023

Revised Date: 21 June 2023

Publish Date: 15 March 2025

摘要

摘要: 研究目的
扬子板块西缘燕山期岩浆活动的缺失致使该时期的构造运动缺乏精确的时间记录，本次工作首次在滇东北乌蒙山地区发现了早白垩世的基性侵入岩，探讨其成因及地质意义对于探索扬子西缘燕山期构造活动具有重要意义。
研究方法
通过详细的野外地质观测、镜下鉴定、锆石U−Pb测年和岩石地球化学方法对新发现的侵入岩进行研究。
研究结果
早白垩世基性侵入岩的岩性为橄榄玄武玢岩，呈斑状结构，杏仁状构造，斑晶以斜长石及橄榄石为主；其31个锆石测点的U−Pb谐和年龄为134.0± 0.4 Ma，形成时代为早白垩世早期。岩石地球化学特征显示其具有富碱、高Ti、高Al、低SiO₂的特征，稀土元素总量较高，重稀土元素亏损，轻、重稀土元素分馏明显，与研究区二叠纪峨眉山玄武岩具有高度相似的地球化学特征，二者应同源，可能是二叠纪形成的峨眉地幔柱尾部交代富集地幔，在班公湖-怒江结合带俯冲-碰撞作用的远程挤压效应下引起软流圈部分熔融，上升侵位过程中与地壳发生轻度混染，形成的基性—超基性侵入岩。
结论
早白垩世橄榄玄武岩玢岩的地球化学特征表明，特提斯构造域与扬子板块西缘的陆缘碰撞造山运动具有巨大的远程效应，其发现也将滇西地区燕山期岩浆活动的研究扩展到了小江断裂带以东的乌蒙山区一带，填补了四川盆地周缘燕山期岩浆活动的空白，同时，橄榄玄武玢岩的形成也表明，扬子板块西缘大规模陆内挤压造山达到高峰，134 Ma左右是扬子板块西缘陆内造山温压达到高峰的时间记录。
- 基性侵入岩 /
- 碰撞造山 /
- 扬子板块西缘 /
- 燕山期 /
- 峨眉山地幔柱
Abstract: Objective
The absence of Yanshanian magmatic activities in the western margin of the Yangtze block has led to a lack of precise time records of tectonic movements during this period. In this study, Early Cretaceous basic intrusive rocks were discovered for the first time in the Wumengshan area of northeastern Yunnan. This discovery is of great significance for exploring the Yanshanian tectonic activities in the western margin of the Yangtze block.
Methods
This paper conducts research on the newly discovered intrusive rocks through detailed field geological observations, microscopic identification, zircon U−Pb dating, and petrogeochemical methods, and explores their genesis and geological significance.
Results
The lithology of the Early Cretaceous basic intrusive rocks is olivine basaltic porphyrite, which has a porphyritic texture and amygdaloidal structure. The phenocrysts are mainly plagioclase and olivine. The U−Pb concordia age of 31 zircon measurement points is 134.0 ± 0.4 Ma, indicating that the formation age is the early stage of the Early Cretaceous. Petrogeochemical characteristics show that these rocks are rich in alkalis, high in Ti and Al, and low in SiO₂. They have a relatively high total rare earth content, depleted heavy rare earths, and obvious fractionation between light and heavy rare earths elements. These characteristics are highly similar to those of the Permian Emeishan basalts in the study area, suggesting that they are the same origin. They may be the metasomatized and enriched mantle at the tail of the Emeishan mantle plume formed in the Permian. Under the long−range extrusion effect of the subduction−collision in the Bangonghu−Nujiang suture zone, partial melting of the asthenosphere occurred. During the ascending and emplacement process, they underwent mild contamination with the crust, forming basic−ultrabasic intrusive rocks.
Conclusions
The Early Cretaceous olivine basaltic porphyrite indicates that the continental−margin collision orogeny between the Tethys tectonic domain and the western margin of the Yangtze Block has a significant long−range effect. Its discovery has extended the research on Yanshanian magmatic activities in western Yunnan to the Wumengshan area east of the Xiaojiang Fault Zone, filling the gap in the study of Yanshanian magmatic activities around the Sichuan Basin. The formation of olivine basaltic porphyrite also indicates that the large−scale intra−continental compressional orogeny in the western margin of the Yangtze Plate reached its peak. 134 Ma is the time record when the temperature and pressure of the intra−continental orogeny in the western margin of the Yangtze block reached their peak.
- basic intrusive rock /
- collision orogeny /
- western margin of the Yangtze /
- Yanshan epoch /
- Emeishan mantle plume

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图 1 研究区大地构造位置（a）及地质简图（b）（据Hou et al., 2002；潘江涛等，2022a修改）

Figure 1.

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图 2 橄榄玄武玢岩野外出露特征及镜下照片

Figure 2.

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图 3 橄榄玄武玢岩锆石阴极发光（CL）（a）及锆石U−Pb年龄（b，c）

Figure 3.

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图 4 橄榄玄武玢岩TAS图解（a）及Nb/Y−Zr/(TiO₂×10⁴)图解（b）（图a据Middlemost, 1994)；图b据Winchester and Floyd, 1977)

Figure 4.

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图 5 橄榄玄武玢岩稀土元素配分曲线图（a）及微量元素蛛网图（b）（二叠纪斜斑辉绿玢岩数据据潘江涛等，2022b；球粒陨石和原始地幔标准化值据Sun et al., 1989）

Figure 5.

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图 6 橄榄玄武玢岩（La/Sm）_N−（Tb/Yb）_N图解（a）及Sm/Yb−La/Sm图解（b）（a据McKenzie et al., 1991；b据Lassiter et al., 1997；峨眉山玄武岩数据及斜斑辉绿玢岩玢岩据潘江涛等，2022b；丽江玄武岩、宾川和永胜玄武岩数据据张招崇等，2005)

Figure 6.

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图 7 橄榄玄武玢岩的Ti/100−Zr−Y×3图解（a，据Pearce and Cann, 1973修改）及Zr−Y/Zr图解（b，据Pearce and Norry, 1979修改）

Figure 7.

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表 1 乌蒙山地区橄榄玄武玢岩LA−ICP−MS锆石U−Th−Pb分析结果

Table 1. LA−ICP−MS zircon U−Th−Pb data for the olivine basaltic porphyrite in Wumengshan area

点号	元素含量/10⁻⁶			²³²Th/ ²³⁸U	同位素比值及误差								年龄/Ma								谐和度/%
	Pb^*	²³²Th	²³⁸U		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁸Pb/²³²Th		²⁰⁷Pb/²⁰⁶Pb		²⁰⁷Pb/²³⁵U		²⁰⁶Pb/²³⁸U		²⁰⁸Pb/²³²Th
	Pb^*	²³²Th	²³⁸U		比值	1σ	比值	1σ	比值	1σ	比值	1σ	年龄	1σ	年龄	1σ	年龄	1σ	年龄	1σ
1	6.7	163.2	294.5	0.55	0.0488	0.0047	0.1400	0.0130	0.0208	0.0005	0.0064	0.0005	60.0	190.0	132.0	11.0	132.4	3.0	129.7	10.0	100
2	3.8	62.9	160.4	0.39	0.0505	0.0043	0.1510	0.0130	0.0213	0.0004	0.0070	0.0006	120.0	160.0	141.0	11.0	135.8	2.7	141.4	11.0	96
3	5.5	108.2	228.7	0.47	0.0489	0.0039	0.1450	0.0120	0.0212	0.0003	0.0065	0.0005	40.0	150.0	135.5	10.0	135.4	2.2	130.1	9.3	100
4	5.4	111.4	227.2	0.49	0.0513	0.0040	0.1440	0.0110	0.0206	0.0004	0.0062	0.0004	120.0	150.0	136.4	10.0	131.4	2.2	124.3	8.5	96
5	5.2	86.0	224.2	0.38	0.0501	0.0041	0.1450	0.0120	0.0212	0.0004	0.0066	0.0005	80.0	150.0	137.0	11.0	135.1	2.2	132.2	11.0	99
6	7.1	103.3	302.4	0.34	0.0489	0.0033	0.1423	0.0099	0.0210	0.0003	0.0070	0.0005	60.0	130.0	133.7	8.8	134.0	2.1	140.4	10.0	100
7	5.1	92.4	211.5	0.44	0.0515	0.0036	0.1540	0.0110	0.0217	0.0004	0.0075	0.0005	150.0	140.0	144.1	9.5	138.2	2.4	150.2	9.4	96
8	8.0	151.0	329.7	0.46	0.0465	0.0031	0.1339	0.0090	0.0207	0.0003	0.0063	0.0004	0.0	130.0	126.5	8.0	132.1	1.8	126.2	7.5	96
9	4.2	77.6	191.8	0.40	0.0456	0.0039	0.1380	0.0120	0.0217	0.0004	0.0065	0.0005	90.0	150.0	130.0	11.0	138.1	2.6	131.4	11.0	94
10	5.7	383.0	254.8	1.50	0.0514	0.0028	0.1506	0.0086	0.0211	0.0003	0.0036	0.0003	230.0	120.0	143.6	8.0	134.4	1.9	72.6	5.8	93
11	3.5	58.1	151.4	0.38	0.0495	0.0046	0.1430	0.0130	0.0211	0.0004	0.0067	0.0006	50.0	170.0	134.0	12.0	134.5	2.5	135.0	12.0	100
12	4.6	82.0	189.9	0.43	0.0501	0.0041	0.1430	0.0120	0.0206	0.0004	0.0066	0.0005	100.0	160.0	135.0	11.0	131.6	2.5	133.6	11.0	97
13	3.0	39.0	129.5	0.30	0.0455	0.0046	0.1340	0.0130	0.0213	0.0005	0.0068	0.0008	100.0	180.0	126.0	12.0	135.8	3.0	137.0	15.0	93
14	7.8	147.4	331.3	0.44	0.0506	0.0031	0.1455	0.0093	0.0205	0.0003	0.0064	0.0004	150.0	120.0	136.8	8.2	131.2	2.0	129.0	8.9	96
15	5.2	95.5	215.1	0.44	0.0502	0.0039	0.1460	0.0110	0.0211	0.0004	0.0064	0.0005	80.0	150.0	136.8	10.0	134.6	2.4	129.6	9.3	98
16	4.8	68.1	217.3	0.31	0.0524	0.0060	0.1490	0.0170	0.0207	0.0004	0.0073	0.0009	140.0	210.0	139.0	15.0	132.1	2.8	148.0	17.0	95
17	7.7	135.7	322.9	0.42	0.0475	0.0032	0.1368	0.0095	0.0209	0.0003	0.0066	0.0004	20.0	130.0	128.9	8.5	133.1	1.9	132.9	8.4	97
18	6.8	120.9	297.9	0.41	0.0451	0.0029	0.1304	0.0088	0.0208	0.0003	0.0065	0.0004	50.0	120.0	123.5	7.8	132.4	1.9	130.4	8.8	93
19	5.9	89.4	243.6	0.37	0.0496	0.0044	0.1420	0.0120	0.0212	0.0005	0.0064	0.0006	90.0	170.0	135.0	11.0	135.2	3.0	128.0	12.0	100
20	4.9	72.6	206.7	0.35	0.0477	0.0036	0.1351	0.0100	0.0208	0.0004	0.0063	0.0005	0.0	140.0	128.3	9.2	132.7	2.2	127.6	11.0	97
21	6.4	94.1	277.8	0.34	0.0470	0.0032	0.1363	0.0096	0.0211	0.0003	0.0068	0.0005	10.0	130.0	128.6	8.5	134.5	2.0	136.5	10.0	96
22	4.8	67.0	201.5	0.33	0.0461	0.0039	0.1340	0.0110	0.0212	0.0004	0.0071	0.0006	60.0	150.0	127.5	10.0	135.0	2.8	142.0	13.0	94
23	6.3	129.0	275.1	0.47	0.0487	0.0046	0.1380	0.0120	0.0209	0.0005	0.0066	0.0006	60.0	170.0	132.0	12.0	133.6	3.3	134.0	13.0	99
24	6.8	106.7	271.0	0.39	0.0484	0.0032	0.1420	0.0098	0.0211	0.0003	0.0067	0.0004	50.0	130.0	133.5	8.6	134.3	2.1	134.3	8.4	99
25	4.7	69.3	191.2	0.36	0.0529	0.0046	0.1580	0.0140	0.0216	0.0004	0.0074	0.0006	140.0	170.0	146.0	12.0	137.5	2.5	148.0	13.0	94
26	4.3	78.6	191.7	0.41	0.0482	0.0038	0.1370	0.0110	0.0205	0.0004	0.0064	0.0005	20.0	140.0	128.7	9.5	130.8	2.3	128.9	10.0	98
27	4.2	60.5	188.7	0.32	0.0527	0.0055	0.1500	0.0150	0.0211	0.0004	0.0069	0.0007	100.0	190.0	139.0	13.0	134.3	2.8	138.0	15.0	97
28	6.4	104.2	269.2	0.39	0.0466	0.0035	0.1344	0.0100	0.0209	0.0004	0.0065	0.0005	20.0	140.0	126.6	9.2	133.2	2.2	130.5	9.7	95
29	4.8	69.4	203.8	0.34	0.0475	0.0038	0.1370	0.0110	0.0211	0.0004	0.0063	0.0006	0.0	150.0	129.1	9.8	134.7	2.6	126.0	11.0	96
30	4.3	60.2	181.4	0.33	0.0470	0.0045	0.1360	0.0130	0.0212	0.0004	0.0064	0.0006	30.0	180.0	130.0	12.0	135.1	2.5	129.0	12.0	96
31	9.5	208.5	375.8	0.55	0.0494	0.0026	0.1469	0.0082	0.0214	0.0003	0.0068	0.0004	140.0	110.0	138.3	7.2	136.5	2.0	136.7	7.7	99
32	6.7	115.8	292.0	0.40	0.0574	0.006	0.1680	0.0170	0.0212	0.0006	0.0212	0.0006	330.0	210.0	156.2	14.9	135.4	3.5	160.2	15.3	86
33	3.8	123.2	204.8	0.60	0.0582	0.0044	0.1650	0.0130	0.0205	0.0004	0.0205	0.0004	380.0	160.0	154.3	11.2	130.9	2.3	120.9	10.2	84
34	5.5	85.3	219.1	0.39	0.0593	0.0084	0.1720	0.0140	0.0211	0.0004	0.0078	0.0006	390.0	170.0	159.5	12.3	134.7	2.5	158.3	12.1	83
注：Pb^为全Pb；谐和度计算公式为：谐和度=100（1−abs（（²⁰⁶Pb/²³⁸U）age−（²⁰⁷Pb/²³⁵U）age））/（（（²⁰⁶Pb/²³⁸U）age+（²⁰⁷Pb/²³⁵U）age）/2）））

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表 2 乌蒙山地区橄榄玄武玢岩样品主量、稀土和微量元素分析结果及相关参数

Table 2. Analysis results and related parameters of major, rare earth and trace elements of samples for the olivine basaltic porphyrite in Wumengshan area

样品编号	SiO₂	Al₂O₃	CaO	MgO	Fe₂O₃	FeO	TiO₂	P₂O₅	Na₂O	K₂O	MnO	CO₂	烧失量	TFe₂O₃
P24-1QY	44.82	13.81	9.04	5.07	4.31	9.03	3.99	0.42	2.02	0.83	0.22	5.51	6.23	14.35
P24-5YQ	48.02	13.44	8.47	4.85	2.75	9.91	3.84	0.39	1.92	1.18	0.20	4.09	4.77	13.77
P24-6YQ	47.23	13.75	9.01	4.91	3.08	9.45	3.84	0.44	2.03	1.13	0.20	4.24	4.70	13.60
P24-7YQ	47.87	12.65	8.31	6.16	5.21	8.63	3.81	0.29	1.96	0.80	0.21	3.61	3.88	14.82
P24-8YQ	48.38	13.27	7.80	5.90	5.14	8.73	3.79	0.29	1.81	0.81	0.20	3.13	3.66	14.86
P24-9YQ	48.58	13.02	8.76	6.19	5.89	7.85	3.77	0.29	1.81	0.93	0.21	4.25	2.51	14.63
P24-10YQ	48.13	12.52	8.89	5.80	4.60	8.54	3.75	0.29	1.91	0.89	0.20	4.16	4.32	14.11
P24-11YQ	46.50	12.41	9.34	6.09	5.26	8.05	3.63	0.30	1.89	0.89	0.19	4.51	5.28	14.22
P24-20YQ	44.24	12.23	8.87	5.51	5.88	8.89	3.70	0.27	1.43	1.37	0.09	6.23	7.34	15.78
P24-21YQ	44.60	11.81	8.70	5.66	5.38	9.37	3.63	0.26	1.32	1.51	0.09	6.03	7.59	15.81
P24-22YQ	44.12	12.10	8.95	5.74	5.80	9.02	3.77	0.28	1.45	1.15	0.10	5.72	7.29	15.84
样品编号	Na₂O+K₂O	Mg^#	TFeO/MgO	Ir	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho
P24-1QY	2.85	50.06	4.81	0.89	46.3	99.9	13.9	59.1	11.4	3.51	10.2	1.49	7.84	1.34
P24-5YQ	3.11	46.59	5.12	1.32	45.5	95.6	12.5	52.5	10.1	3.23	9.49	1.31	6.81	1.16
P24-6YQ	3.16	48.10	4.91	0.83	45.6	97.9	13.2	56.4	10.5	3.41	9.76	1.37	7.31	1.3
P24-7YQ	2.76	55.97	3.97	0.79	45	94.4	13.4	57.4	11.8	3.5	10.2	1.51	7.86	1.36
P24-8YQ	2.62	54.64	4.17	1.27	42.6	92	13	56	11.6	3.44	9.91	1.47	7.65	1.33
P24-9YQ	2.74	58.41	3.78	0.39	45	95.7	13.3	56.7	11.6	3.39	9.96	1.48	7.7	1.35
P24-10YQ	2.80	54.75	4.07	0.71	47.8	98.9	13.7	58.5	11.9	3.42	10.1	1.48	7.72	1.35
P24-11YQ	2.78	57.41	3.81	0.99	51.4	104	14.2	59.8	12	3.42	10.3	1.5	7.73	1.35
P24-20YQ	2.81	52.52	4.65	1.33	46.6	94.8	13.4	56.9	11.6	3.64	9.8	1.44	7.54	1.32
P24-21YQ	2.83	51.85	4.64	0.21	45.1	92.7	13.1	55.9	11.4	3.46	9.61	1.42	7.39	1.28
P24-22YQ	2.60	53.14	4.51	0.05	47.4	96.2	13.6	58.2	11.7	3.62	9.89	1.48	7.63	1.33
样品编号	Er	Tm	Yb	Lu	Y	ΣREE	LREE	HREE	LREE/HREE	Sm/Nd	(La/Yb)_N	(Tb/Yb)_N	(La/Sm）_N	δEu
P24-1QY	3.54	0.47	2.82	0.44	35.5	262.25	234.11	28.14	8.32	0.19	11.78	2.35	2.62	1.00
P24-5YQ	3.16	0.43	2.5	0.33	31.7	244.62	219.43	25.19	8.71	0.19	13.05	2.10	2.91	1.01
P24-6YQ	3.44	0.46	2.74	0.37	32.7	253.76	227.01	26.75	8.49	0.19	11.94	2.49	2.80	1.03
P24-7YQ	3.67	0.48	2.92	0.42	36.9	253.92	225.50	28.42	7.93	0.21	11.05	2.50	2.46	0.98
P24-8YQ	3.54	0.48	2.83	0.41	35.9	246.26	218.64	27.62	7.92	0.21	10.80	2.29	2.37	0.98
P24-9YQ	3.58	0.48	2.9	0.41	36.1	253.55	225.69	27.86	8.10	0.20	11.13	2.38	2.50	0.96
P24-10YQ	3.59	0.49	2.9	0.41	36.3	262.26	234.22	28.04	8.35	0.20	11.82	2.39	2.59	0.95
P24-11YQ	3.59	0.48	2.88	0.42	37	273.07	244.82	28.25	8.67	0.20	12.80	2.35	2.77	0.94
P24-20YQ	3.52	0.47	2.84	0.42	36.6	254.29	226.94	27.35	8.30	0.20	11.77	2.32	2.59	1.04
P24-21YQ	3.39	0.45	2.71	0.4	35.1	248.31	221.66	26.65	8.32	0.20	11.94	2.27	2.55	1.01
P24-22YQ	3.56	0.48	2.83	0.42	37	258.34	230.72	27.62	8.35	0.20	12.01	2.48	2.62	1.03
样品编号	δCe	Ni	Co	Cu	Pb	W	As	Se	Cr	V	Ga	In	Rb	Cs
P24-1QY	0.97	49.6	48.6	226	10.3	1.83	0.72	0.28	79.4	487	28.5	0.1	23.3	1.17
P24-5YQ	0.98	44.7	46.8	217	10.5	2.43	0.83	0.32	73.8	447	25.6	0.09	31.7	0.85
P24-6YQ	0.98	47.9	48.3	217	8.65	4.32	0.73	0.3	75.9	450	26.5	0.1	24.1	0.9
P24-7YQ	0.94	47.3	48.1	220	10.7	15.8	0.98	0.29	78.6	463	28.1	0.097	20.5	1.2
P24-8YQ	0.96	49.3	75.6	226	11.4	41.7	0.68	0.28	77.6	455	28.5	0.099	20.1	1.23
P24-9YQ	0.96	47.4	47.8	219	10.7	21.1	0.83	0.29	73.4	448	28.1	0.1	23.5	1.64
P24-10YQ	0.95	47.8	45.4	231	12.9	4.04	0.51	0.28	76	445	28.3	0.099	22.2	1.02
P24-11YQ	0.94	45.8	46.4	211	11.1	3.56	0.77	0.28	73.5	452	29	0.1	25.2	1.1
P24-20YQ	0.93	45.4	43.8	198	9.82	0.61	0.34	0.27	76	463	26.8	0.096	44.1	1.54
P24-21YQ	0.94	44.1	44.6	195	9.86	0.61	0.34	0.26	74.4	445	27.2	0.1	42.8	1.6
P24-22YQ	0.93	46.4	45.6	204	7.92	0.53	0.34	0.27	76.6	472	27.7	0.11	35.1	1.64
样品编号	Th	Hf	Zr	Nb	Ta	U	Li	B	Sr	Cd	Ge	Sn	F	Ba
P24-1QY	5.75	10.9	327	34.4	2.71	1.29	20.5	4.04	592	0.062	1.37	2.64	892	255
P24-5YQ	4.81	9.26	317	32.3	2.48	1.16	18	4.68	561	0.06	1.47	2.98	792	358
P24-6YQ	5.29	9.75	317	33	2.68	1.27	17.6	4.43	573	0.05	1.38	2.52	944	324
P24-7YQ	5.64	9.37	332	34.6	2.61	1.33	19.8	7.15	567	0.062	1.46	2.88	789	327
P24-8YQ	5.77	9.51	342	34.8	2.68	1.33	19.2	9.27	544	0.055	1.5	3.4	783	342
P24-9YQ	5.98	9.47	333	33.8	2.6	1.46	19.6	12.5	553	0.06	1.48	2.62	737	423
P24-10YQ	5.39	9.29	330	33.7	2.58	1.29	17.3	7.35	562	0.058	1.41	2.86	823	322
P24-11YQ	5.34	9.06	319	33.5	2.51	1.27	21.6	6.88	568	0.059	1.46	3.24	671	324
P24-20YQ	5.54	9	320	36	2.48	1.28	27.8	5.41	583	0.07	1.02	3.15	560	350
P24-21YQ	5.53	9.19	307	33.4	2.53	1.3	27.9	5.13	580	0.063	0.98	3.19	511	386
P24-22YQ	5.34	9.23	315	34.1	2.49	1.26	28.3	4.85	618	0.061	1.09	2.7	529	306
注：Mg^#=(100×Mg²⁺)/(Mg²⁺+Fe²⁺)；Mg²⁺= MgO/ 40.30；TFeO= FeO+ Fe₂O₃× 0.8998；TFe₂O₃=Fe₂O₃+FeO× 1.1113； δCe=Ce_N/((La_N+Pr_N)/2)；δEu=Eu_N/((Sm_N+Gd_N)/2)；主量元素含量单位为%，微量和稀土元素含量单位为10⁻⁶

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表 3 橄榄玄武玢岩和OIB端元及各主要化学储库不相容元素比值

Table 3. Ratio of incompatible elements for the olivine basaltic porphyrite and end member component

元素	Zr/Nb	La/Nb	Ba/Nb	Ba/Th	Rb/Nb	Th/Nb	Th/La	Ba/La
原始地幔	14.8	0.94	9	77	0.91	0.117	0.125	9.6
N-MORB	330	1.07	4.3	60	0.36	0.071	0.067	4
EMⅠ-OIB	5～13.1	0.78～1.32	9.1～23.4	80～204	0.69～1.41	0.094～0.130	0.089～0.147	11.2～19.1
EMⅡ-OIB	4.4～7.8	0.79～1.19	6.4～11.3	57～105	0.58～0.87	0.105～0.168	0.108～0.183	7.3～13.5
HIMU-OIB	3.2～5	0.66～0.77	4.9～5.9	63～77	0.35～0.38	0.078～0.101	0.107～0.133	6.8～8.7
橄榄玄武玢岩	9.52	1.36	9.95	61.56	0.83	0.16	0.12	7.31
斜斑辉绿玢岩	10.48	1.48	12.64	71.92	1.53	0.17	0.12	8.53
注：原始地幔、N-MORB、HIMU-OIB、EMⅠ-OIB和EMⅡ-OIB元素比值据Weaver, 1991

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扬子地块西缘乌蒙山地区早白垩世橄榄玄武玢岩的发现及其对陆缘碰撞造山事件陆内响应的启示

作者简介: 张宏辉（1989− ），男，硕士，高级工程师，从事区域地质调查工作。E−mail：673872084@qq.com

通讯作者: 张七道（1987− ），男，硕士，高级工程师，从事区域地质矿产调查工作。E−mail：506676421@qq.com

The discovery of the Early Cretaceous olive basaltic porphyrite in the Wumengshan area on the western margin of the Yangtze block and its implications for the intracontinental response to the continental margin collision orogenic event

Corresponding author: ZHANG Qidao, 506676421@qq.com

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