甘蒙北山后红泉地区海相玄武岩地球化学、年代学特征及成因

郭小刚; 陈守余; 苟瑞; 刘鑫; 王秦; 蒲强林

doi:10.3799/dqkx.2020.378

甘蒙北山后红泉地区海相玄武岩地球化学、年代学特征及成因

doi: 10.3799/dqkx.2020.378

郭小刚^{1, 2, ,},
陈守余^1, ,,
苟瑞²,
刘鑫³,
王秦²,
蒲强林²

1.
中国地质大学资源学院, 湖北武汉 430074
2.
甘肃省有色金属地质勘查局白银矿产勘查院, 甘肃白银 730900
3.
甘肃省地质矿产勘查开发局第一地质矿产勘查院, 甘肃天水 741020

基金项目:

甘肃省基础地质调查项目甘国土资勘发2016[33]-6

甘肃省基础地质调查项目 2017[47]-17

甘肃省基础地质调查项目 2018[45]-28

详细信息

作者简介:
郭小刚(1989-), 男, 硕士研究生, 工程师, 主要研究矿产资源综合勘查与评价.ORCID: 0000-0003-4784-9741.E-mail: 491935960@qq.com

通讯作者:
陈守余, E-mail: sychen@cug.edu.cn

中图分类号: P588;P595;P597
计量
- 文章访问数: 477
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- 被引次数: 0
出版历程
- 收稿日期: 2020-12-29
- 网络出版日期: 2021-12-04
- 刊出日期: 2021-11-30

Geochemistry, Chronology and Genesis of Marine Basalts in Houhongquan Area, Beishan, Gansu and Inner Mongolia

Guo Xiaogang^{1, 2
,
,},
Chen Shouyu^{1
, ,},
Gou Rui²,
Liu Xin³,
Wang Qin²,
Pu Qianglin²

1.
School of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
Baiyin Mineral Exploration Institute of Gansu Nonferrous Metal Geological Exploration Bureau, Baiyin 730900, China
3.
The First Institute of Geology and Mineral Exploration and Development of Gansu Province, Tianshui 741020, China

摘要

摘要: 甘蒙北山地区发育的海相二叠系地层是中亚造山带南缘最年轻的海相沉积地层之一，为进一步探讨二叠纪古亚洲洋的关闭及后期的碰撞造山作用的时间节点，选取甘蒙北山后红泉地区二叠系海相火山岩-碎屑岩地层的5条代表性剖面进行了岩性-岩相及分布特征研究，并对海相地层中的玄武岩进行了岩相学、元素地球化学以及全岩Sr-Nd同位素等研究，同时选择剖面典型岩石进行了LA-ICP-MS锆石U-Pb定年.获得流纹英安岩与含砂亮泥晶生屑灰岩年龄分别为273±1.7 Ma和275.8±1.4 Ma，结合已发表年龄数据及古生物资料，明确了火山岩的喷发时代介于早二叠世亚丁斯克期-中二叠世沃德期，应厘定为双堡塘组；地球化学研究表明，后红泉地区玄武岩SiO₂含量介于47.48%~54.56%，主要为玄武岩和玄武安山岩，属钠质拉斑玄武岩；稀土总量（ΣREE）较高，为74.90×10^-6~173.61×10^-6，LREE/HREE为2.32~6.55，表现出轻稀土相对重稀土轻微富集，（La/Yb）_N=1.30~6.20，在球粒陨石标准化分布曲线整体上呈现LREE轻度富集、配分曲线平缓的特征，相对富集La、Ce、Nd、Zr、Hf等元素，不同程度地亏损Ta、Nb、P、Ti等元素，δEu=0.83~1.20，无明显的Eu异常；（⁸⁷Sr/⁸⁶Sr）_i为0.702 024~0.706 432，ε_Nd（t）值介于1.99~6.54（除了-0.59和-0.83）.因此，后红泉地区玄武岩岩浆是由接近原始地幔成分的石榴石二辉橄榄岩低程度熔融形成，其演化成岩过程中并未经地壳的强烈混染，而在岩浆源区发生了强烈的混染作用，推测软流圈地幔受到了陆源沉积岩、大陆地壳或蚀变大洋地壳改造，岩石圈拆沉作用可能是其产生的重要机制；说明古亚洲洋在早期已闭合，至早-中二叠世进一步拉张裂解形成了裂谷盆地.
- 北山 /
- 二叠系 /
- 地球化学特征 /
- 年代学特征 /
- 构造环境 /
- 岩石学
Abstract: The marine Permian strata developed in the Beishan area, Gansu and Inner Mongolia, is one of the youngest marine sedimentary strata in the southern margin of the Central Asian orogenic belt. To further explore the timeline of the Permian paleo-Asian Ocean closure and the later collisional orogeny, five representative sections of the Permian marine volcaniclastic-clastic strata in the Houhongquan, Beishan, Gansu and Inner Mongolia were selected for lithology-petrography and distribution characteristics studies, and petrography, elemental geochemistry and whole-rock Sr-Nd isotope studies were conducted on the basalts in the marine strata. In addition, a typical rock profile was selected for LA-ICP-MS zircon U-Pb dating. The ages of the rhyodacite and the sand-bearing bright micrite bioclastic limestone are 273±1.7 Ma and 275.8±1.4 Ma, respectively. Combined with published age data and paleontological data, it is clear that the eruption age of the volcanic rock is between the Artinskian age of Early Permian to the Ward stage of the Middle Permian. It should be determined as the Shuangbaotang Formation. The SiO₂ contents of basalt in Houhongquan area ranges from 47.48% to 54.56%, mainly basalt and basalt andesite, belonging to sodium-tholeiitic basalt. The total content of rare earth elements (ΣREE) is relatively high, ranging 74.90×10^-6-173.61×10^-6, LREE/HREE is between 2.32-6.55, showing slight enrichment of light rare earth elements relative to heavy rare earth elements, with (La/Yb)_N=1.30-6.20. On the whole, chondrite-normalized distribution curve shows slightly enriched LREE with the gentle distribution curve, relatively enriched elements such as La, Ce, Nd, Zr, Hf, and depleted Ta, Nb, P, Ti and other elements to varying degrees, δEu=0.83-1.20, no obvious Eu anomaly. (⁸⁷Sr/⁸⁶Sr)_i is 0.702 024-0.706 432, the ε_Nd(t)values between 1.99 and 6.54 (except -0.59 and -0.83). Therefore, the basalt magma in the Houhongquan area is formed by low-degree melting of the garnet peridotite, which is close to the original mantle composition. During its evolution and diagenesis, it was not strongly contaminated by the crust, but a strong contaminant occurred in the magma source area. It is speculated that the asthenospheric mantle has been modified by terrigenous sedimentary rocks, continental crust or altered oceanic crust, and lithospheric delamination may be an important mechanism for its generation. It shows that the Paleo-Asian Ocean was closed in the early period, and the rift basin was formed by further extension and rifting in the Early-Middle Permian.
- Beishan /
- Permian /
- geochemical characteristics /
- chronological characteristics /
- tectonic setting /
- petrology

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图 1 甘蒙北山地区构造地质简图

据聂风军等(2002)；党犇等(2011)；张新虎等(2013)修改. ①骆驼山-红石山-黑鹰山-雅干深大断裂；②明水-石板井-小黄山深断裂；③红柳河-牛圈子-洗肠井蛇绿岩带；④黑山-咸泉子深大断裂；⑤柳园-大奇山-帐房山深大断裂；⑥安山-旧寺墩深大断裂；⑦阿尔金-恩格尔乌苏深大断裂；⑧龙首山断裂；⑨查干础鲁断裂带；⑩吉兰泰断裂带；I.西伯利亚板块；II.哈萨克斯坦板块；III.塔里木板块；IV.华北板块；V.柴达木-祁连板块

Fig. 1. Tectonic and geological sketch map of the Beishan area, Gansu and Inner Mongolia

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图 2 研究区地质简图

Fig. 2. Geological map of the study area

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图 3 北山地区研究剖面地层综合柱状图

Fig. 3. Generalized composite stratigraphical sections for the measured geological profiles in Beishan area

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图 4 流纹英安岩(a)和含砂亮晶泥晶生屑灰岩(b)

Fig. 4. Rhyodacite(a) and sand-bearing sparry micrite bioclastic limestone (b)

a, b.(+)10×2

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图 5 后红泉剖面同位素样品锆石CL图像

图中红色圈为U-Pb年龄测点

Fig. 5. The zircon CL images for the samples from Houhongquan profiles

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图 6 锆石U-Pb年龄谐和图和²⁰⁶Pb/²³⁸U年龄权重分布图

Fig. 6. Concordia diagrams of zircon U-Pb and zircon ²⁰⁶Pb/²³⁸U weighted mean ages

a.XWG8;b.XWG12

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图 7 后红泉火山岩样品SiO₂-(Na₂O+K₂O)图解(a)、Nb/Y-Zr/TiO₂判别图解(b)、SiO₂-K₂O图解(c)和SiO₂-FeO*/MgO图解(d)

a.底图据Bas et al.(1986)；b.据Winchester and Floyd(1977)；c.底图据Hastie et al. (2007)；d. Miyashiro(1974)；Le Maitre蓝色线，Rickwood总结了Peccerillo and Taylor(1976)，Ewart(1982)，Innocenti et al.(1982)，Carr(1985)和Middlemost(1985)的分类界线，以绿色阴影条带表示

Fig. 7. SiO₂-(Na₂O+K₂O)(a), Nb/Y-Zr/TiO₂(b), SiO₂-K₂O(c), SiO₂-FeO*/MgO(d) diagrams for the volcanic samples from Houhongquan profiles

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图 8 后红泉玄武岩样品稀土元素球粒陨石标准化分布型式图(a)和微量元素原始地幔标准化蛛网图(b)

标准化值据Sun and Mcdonough (1989)；Taylor and McDonough(1985)，OIB、N-MORB、E-MORB及弧亚碱性玄武岩的分配样式参考Xia and Li (2019)

Fig. 8. Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element spider diagram (b) for the basalts from Houhongquan area

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图 9 后红泉地区二叠纪玄武岩样品微量元素比值及同位素图解

a. La/Yb-La图解(据Baker et al., 1997)；b. Y/Nb-Zr/Nb图解(据Wilson，1989)；c.SiO₂-ε_Nd(t) 图解；d.SiO₂-(⁸⁷Sr/⁸⁶Sr)_i图解；e. Nb/U-Nb/Th图解；f. Nb/Th-Th/U图解(据Pearce and Peate, 1995).PM.地幔柱；CC.大陆壳；OIB.洋岛玄武岩；IAB.岛弧玄武岩；N-MORB.正常洋中脊

Fig. 9. Trace element ratio and isotope diagrams for the Permian basalts from Houhongquan area

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图 10 玄武岩Zr/Y-Zr (a)、Nb×2-Zr/4-Y (b)、Ti-V(c)判别图解和Sm/Yb-La/Sm图解(d)

a. 据Pearce and Norry (1979)；A.火山弧玄武岩；B.MORB；C.板内玄武岩；D.MORB和火山弧玄武岩；E.MORB和板内玄武岩；b. 据Meschede (1986)；AⅠ.板内碱性玄武岩；AⅡ.板内玄武岩和板内拉斑玄武岩；B.E型MORB；C.板内拉斑玄武岩和火山弧玄武岩；D.N型MORB和火山弧玄武岩；c.据Shervais (1982)汇编；BABB.弧后盆地玄武岩；d.底图据Mahoney and Coffin(1997)；PM. 原始地幔；DMM.亏损地幔；CLM.大陆岩石圈地幔；LC.下地壳；CC.整个地壳；UC.上地壳

Fig. 10. Zr/Y-Zr (a), Nb×2-Zr/4-Y (b), Ti-V (c) discrimination diagrams of basalts and Sm/Yb vs. La/Sm diagram (d)

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表 1 甘蒙北山地区二叠系划分及命名沿革表

Table 1. History of the stratigraphical subdivision and formations of the Permian strata in the Beishan area, Gansu and Inner Mongolia

郭敬信（1964）			朱伟元和沈光隆（1977）		甘肃省地层表编写组（1983）		内蒙古自治区地质矿产局（1991）		李文国（1996）		杨雨等（1997）		张新虎等（2013）
统	组		统	组	统	组	统	组	统	组	统	组	统	组
上二叠统	红柳峡群		上二叠统	方山口群	上二叠统	红岩井组	上二叠统	哈尔苏海群	上二叠统	哈尔苏海组	上二叠统	方山口组	上二叠统	红岩井组		方山口组
										哈尔苏海组		红岩井组
										方山口组		金塔组
下二叠统	梧桐沟组			金塔组	下二叠统	金塔组	中二叠统	方山口组	下二叠统	金塔组	下二叠统	双堡塘组	中二叠统	双堡塘组	双堡塘组	双堡塘组	金塔组
	双堡塘组	哲斯组	下二叠统	菊石滩组		双堡塘组	下二叠统	双堡塘组		双堡塘组			下二叠统		黄丘泉砂岩	红山井灰岩	双堡塘组
	双堡塘组	哲斯组	下二叠统	双堡塘组		双堡塘组	下二叠统	双堡塘组		双堡塘组			下二叠统		黄丘泉砂岩	红山井灰岩	双堡塘组

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表 2 后红泉剖面样品锆石U-Pb测试结果

Table 2. Zircon U-Pb dating results of the samples from Houhongquan profiles

测试编号	Pb(10^-6)	²³²Th(10^-6)	²³⁸U(10^-6)	²³²Th/²³⁸U	同位素比值						同位素年龄(Ma)
测试编号	Pb(10^-6)	²³²Th(10^-6)	²³⁸U(10^-6)	²³²Th/²³⁸U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
XWG8含砂亮泥晶生屑灰岩
1	5	52	89	0.58	0.056 4	0.004 1	0.335 9	0.024 2	0.043 2	0.000 8	478	167.57	294	18.36	273	5.10
2	16	130	315	0.41	0.050 4	0.001 1	0.300 9	0.007 4	0.043 3	0.000 5	213	49.99	267	5.78	273	3.16
3	13	94	253	0.37	0.055 1	0.001 3	0.331 6	0.009 6	0.043 5	0.000 6	417	56.48	291	7.29	275	3.76
4	17	197	318	0.62	0.052 7	0.000 9	0.317 5	0.006 1	0.043 8	0.000 5	322	40.74	280	4.67	276	3.30
5	17	157	332	0.47	0.051 8	0.001 1	0.313 9	0.008 1	0.043 8	0.000 5	280	50.00	277	6.23	277	3.33
6	41	447	758	0.59	0.051 9	0.000 6	0.312 0	0.005 2	0.043 6	0.000 5	283	27.78	276	3.99	275	3.16
7	40	366	759	0.48	0.053 0	0.001 1	0.317 2	0.008 3	0.043 3	0.000 4	328	48.15	280	6.42	274	2.68
8	15	115	292	0.39	0.051 6	0.001 1	0.312 9	0.006 7	0.044 1	0.000 4	265	52.77	276	5.16	278	2.65
9	38	376	701	0.54	0.052 1	0.000 7	0.315 4	0.005 0	0.044 0	0.000 6	287	33.33	278	3.88	278	3.53
10	22	308	377	0.82	0.051 0	0.000 8	0.309 0	0.005 6	0.044 0	0.000 5	239	32.40	273	4.33	278	3.08
11	8	136	143	0.95	0.049 7	0.001 9	0.298 3	0.011 6	0.043 6	0.000 5	189	116.65	265	9.10	275	3.03
12	9	62	176	0.35	0.052 2	0.001 8	0.310 7	0.010 1	0.043 3	0.000 5	295	79.62	275	7.80	273	3.28
13	31	423	547	0.77	0.052 2	0.000 8	0.319 8	0.004 9	0.044 5	0.000 6	295	35.18	282	3.79	281	3.48
14	41	390	771	0.51	0.051 8	0.000 6	0.315 2	0.004 4	0.044 2	0.000 5	276	23.15	278	3.43	279	3.12
15	15	127	302	0.42	0.053 4	0.001 1	0.321 6	0.007 6	0.043 6	0.000 5	346	44.44	283	5.82	275	2.95
16	8	51	159	0.32	0.050 6	0.001 4	0.310 2	0.009 9	0.044 3	0.000 6	233	60.18	274	7.66	280	3.97
17	11	87	216	0.40	0.049 8	0.001 0	0.303 4	0.007 0	0.044 2	0.000 5	183	15.74	269	5.45	279	3.24
18	12	171	206	0.83	0.057 0	0.003 1	0.336 6	0.017 1	0.043 0	0.000 5	500	120.35	295	13.00	271	3.30
19	22	247	418	0.59	0.054 9	0.001 0	0.330 1	0.006 7	0.043 7	0.000 6	409	43.52	290	5.09	276	3.92
20	14	121	288	0.42	0.051 5	0.001 0	0.306 5	0.007 5	0.043 1	0.000 5	265	46.29	271	5.81	272	3.39
XWG12流纹英安岩
1	17	238	298	0.80	0.055 8	0.001 7	0.333 9	0.010 6	0.043 4	0.000 4	443	66.66	293	8.06	274	2.66
2	13	178	239	0.74	0.054 0	0.001 5	0.322 0	0.008 8	0.043 5	0.000 6	372	64.81	283	6.72	274	3.46
3	12	129	212	0.61	0.048 1	0.007 4	0.287 7	0.046 2	0.043 2	0.000 5	106	325.89	257	36.43	273	2.79
4	25	336	449	0.75	0.050 7	0.001 6	0.302 2	0.009 7	0.043 3	0.000 5	228	72.21	268	7.55	273	3.24
5	38	437	708	0.62	0.052 3	0.001 2	0.309 8	0.009 8	0.042 8	0.000 5	298	53.70	274	7.62	270	3.00
6	13	124	236	0.53	0.056 2	0.002 7	0.333 9	0.017 0	0.043 0	0.000 4	457	105.55	293	12.97	271	2.74
7	15	187	274	0.68	0.052 6	0.001 6	0.315 6	0.010 0	0.043 5	0.000 4	309	66.66	279	7.71	274	2.76
8	32	504	545	0.92	0.052 6	0.000 9	0.312 7	0.007 0	0.043 1	0.000 7	309	38.89	276	5.40	272	4.18
9	25	343	433	0.79	0.053 9	0.002 4	0.323 0	0.018 6	0.043 3	0.000 7	369	99.99	284	14.29	273	4.32
10	18	258	325	0.79	0.050 8	0.001 9	0.302 0	0.010 7	0.043 2	0.000 5	232	87.02	268	8.31	273	2.95
11	11	122	193	0.63	0.050 6	0.004 4	0.299 4	0.026 2	0.042 9	0.000 8	220	199.98	266	20.51	271	5.10
12	17	233	304	0.77	0.053 7	0.001 7	0.318 3	0.010 8	0.043 0	0.000 5	367	72.22	281	8.31	271	3.37
13	22	290	376	0.77	0.058 3	0.001 0	0.351 3	0.011 0	0.043 6	0.001 1	539	43.51	306	8.27	275	6.61
14	29	423	501	0.84	0.055 3	0.001 3	0.328 4	0.006 8	0.043 2	0.000 5	433	51.85	288	5.22	273	3.38

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表 3 后红泉地区二叠纪玄武岩主量(%)及微量(10^-6)元素结果

Table 3. Major (%) and trace element (10^-6) data of the Permian basalts from Houhongquan area

样品	XWG	XWG	XWG	XWG	XWG	XWG	XWG	XWG	XWG	XWG	XWG	许伟等(2019)
编号	9	10	22	23	24	35	36	38	42	43	45	许伟等(2019)
岩性	杏仁状(安山)玄武岩	杏仁状(安山)玄武岩	杏仁状安山岩	杏仁状玄武岩	杏仁状玄武岩	杏仁状粒玄岩	杏仁状玄武岩	杏仁状玄武岩	杏仁状玄武岩	杏仁状玄武岩	杏仁状玄武岩	16HHQ-H5	16HHQ-H11	16HHQ-H13	16HHQ-H17	16HHQ-H18
名称	杏仁状(安山)玄武岩	杏仁状(安山)玄武岩	杏仁状安山岩	杏仁状玄武岩	杏仁状玄武岩	杏仁状粒玄岩	杏仁状玄武岩	杏仁状玄武岩	杏仁状玄武岩	杏仁状玄武岩	杏仁状玄武岩	玄武岩	玄武岩	玄武岩	玄武岩	玄武岩
主量元素
SiO₂	47.76	49.46	50.66	49.78	53.12	48.70	50.08	50.28	49.80	47.48	53.10	48.6	48.72	47.5	54.56	51.04
Al₂O₃	15.36	14.12	17.84	16.30	16.75	15.15	13.78	15.63	17.01	16.89	15.57	14.7	15.56	15.69	13.91	12.98
Fe₂O₃	3.45	2.00	2.61	2.64	2.36	4.71	4.13	2.49	4.24	3.37	3.92	3.85	2.91	2.86	5.88	4.25
FeO	4.98	6.65	6.63	7.01	5.82	6.42	7.15	6.77	6.01	6.50	5.15	6.6	5.76	6.24	2.74	3.61
TiO₂	1.41	1.82	1.58	1.78	1.17	1.85	2.39	1.71	2.07	2.06	1.40	1.86	1.75	1.84	1.4	1.32
K₂O	0.01	0.01	0.82	0.97	0.93	0.36	0.73	0.18	1.19	0.43	0.24	0.35	0.4	0.44	0.1	0.18
Na₂O	2.76	4.37	3.30	3.27	3.64	3.27	3.62	2.99	3.85	3.14	3.34	3.56	2.61	3.58	3.12	3.43
CaO	12.21	10.18	7.09	6.81	6.89	7.84	9.12	8.36	7.47	7.91	8.20	10.9	10.95	9.72	9.38	10.76
MgO	5.62	4.96	5.60	7.06	5.50	8.36	5.75	7.76	6.13	7.56	5.95	5.12	7.08	7	3.57	4.77
MnO	0.17	0.16	0.16	0.14	0.13	0.20	0.21	0.15	0.18	0.21	0.16	0.14	0.2	0.18	0.1	0.11
P₂O₅	0.20	0.36	0.29	0.34	0.30	0.22	0.29	0.20	0.30	0.31	0.21	0.28	0.3	0.52	0.32	0.29
LOI	5.48	4.45	3.57	3.86	3.44	3.10	3.08	3.48	2.35	4.29	3.76	3.74	3.45	4.16	4.65	6.94
CO₂	5.38	4.77	0.46	0.20	0.62	0.28	1.21	0.23	0.14	0.92	0.97	-	-	-	-	-
σ	1.61	2.97	2.22	2.65	2.06	2.31	2.67	1.38	3.74	2.84	1.27	2.73	1.58	3.59	0.9	1.62
SI	33.41	27.57	29.54	33.70	30.14	36.16	26.89	38.43	28.62	36.00	31.99	26.28	37.74	34.79	23.17	29.37
Mg^#	0.55	0.51	0.53	0.57	0.55	0.58	0.49	0.61	0.53	0.59	0.55	0.5	0.63	0.61	0.47	0.56
稀土元素
La	8.72	15.05	13.19	15.29	18.89	9.42	9.61	7.65	12.54	11.65	9.06	15.2	9.95	24.2	13.7	12.4
Ce	21.72	36.50	29.87	44.53	50.63	28.13	26.66	21.08	39.75	37.91	22.37	36.6	27.3	65.6	33.1	30.6
Pr	3.64	5.51	4.60	6.01	6.31	4.65	4.40	3.51	5.37	4.96	4.00	5.06	4.08	9.35	4.68	4.25
Nd	16.40	23.66	19.80	25.36	28.21	20.43	20.79	15.77	24.45	22.15	19.13	22.2	18.6	40	20.5	19
Sm	4.22	5.58	4.82	5.87	6.41	5.51	5.73	4.93	6.20	6.44	4.39	5.88	4.94	8.94	5.2	4.85
Eu	1.53	1.91	2.07	2.06	1.77	1.87	2.06	1.59	1.97	1.98	1.52	1.87	1.74	2.54	1.56	1.49
Gd	4.55	5.6	5.74	7.43	6.53	6.83	6.81	5.35	7.34	6.28	4.63	6.28	5.18	7.76	5.32	4.97
Tb	0.89	1.04	0.82	1.11	1.06	1.27	1.16	0.93	1.07	1.02	0.81	1.04	0.86	1.13	0.92	0.84
Dy	4.25	5.32	5.29	6.64	6.25	7.87	8.07	6.46	6.41	6.51	5.74	6.58	5.42	6.23	5.88	5.4
Ho	1.14	1.24	1.11	1.35	1.22	1.66	1.62	1.36	1.50	1.34	1.13	1.42	1.17	1.18	1.2	1.13
Er	3.45	3.57	3.38	4.08	3.79	4.8	4.65	4.12	4.21	4.28	3.28	3.96	3.1	3.02	3.29	3.1
Tm	0.51	0.57	0.51	0.67	0.63	0.79	0.69	0.58	0.69	0.70	0.51	0.59	0.47	0.44	0.5	0.47
Yb	3.35	3.59	3.26	4.02	4.19	4.81	4.65	3.97	4.30	4.30	3.29	3.8	3	2.8	3.21	3.07
Lu	0.53	0.59	0.55	0.69	0.67	0.74	0.77	0.70	0.74	0.70	0.59	0.58	0.45	0.42	0.48	0.46
ΣREE	74.90	109.73	95.01	125.11	136.57	98.77	97.67	78.00	116.54	110.23	80.44	111.06	86.26	173.61	99.54	92.03
LREE	56.23	88.21	74.35	99.12	112.22	70.00	69.24	54.53	90.27	85.11	60.46	86.81	66.61	150.63	78.74	72.59
HREE	18.67	21.52	20.66	25.99	24.35	28.77	28.43	23.47	26.27	25.12	19.98	24.25	19.65	22.98	20.8	19.44
LREE/HREE	3.01	4.10	3.60	3.81	4.61	2.43	2.44	2.32	3.44	3.39	3.03	3.58	3.39	6.55	3.79	3.73
δEu	1.06	1.03	1.20	0.95	0.83	0.93	1.01	0.94	0.89	0.94	1.02	0.94	1.05	0.93	0.91	0.93
δCe	0.93	0.96	0.92	1.12	1.11	1.02	0.98	0.98	1.16	1.20	0.89	1	1.03	1.05	0.99	1.01
(La/Yb)_N	1.75	2.83	2.73	2.56	3.04	1.32	1.39	1.30	1.97	1.83	1.86	2.87	2.38	6.2	3.06	2.9
(La/Sm)_N	1.30	1.70	1.72	1.64	1.85	1.08	1.05	0.98	1.27	1.14	1.30	1.63	1.27	1.7	1.66	1.61
微量元素
Sr	379	207	472	401	375	206	237	184	496	226	212	184	445	546	290	285
Li	10.1	23.9	24.6	27.3	14.2	9.6	18.4	14.4	19.4	23.9	15.7	8.8	14.3	14.7	16	16.8
Be	0.75	1.22	1.27	1.38	1.26	1.10	1.21	0.89	1.58	1.39	0.85	-	-	-	-	-
V	97.8	98.2	220.2	211.5	161.7	298.4	354.1	258.4	252.1	246.5	245.6	350	290	265	242	233
Cr	144.1	93.75	78.64	123.3	105.0	250.5	174.2	236.3	150.8	166.3	146.7	93.2	272	246	146	148
Ga	11.1	12.50	21.00	20.22	20.02	19.92	18.38	19.08	21.44	19.76	17.33	21.9	17.2	18	13.5	14.1
Co	32.42	28.29	29.31	30.46	27.90	40.79	41.87	39.93	34.65	36.70	31.25	35.3	38	35.3	25.3	27.1
Ni	52.14	38.49	25.54	43.63	38.87	49.26	40.65	54.69	50.21	63.48	37.48	26.7	68.8	60.6	51.2	51.2
Ba	36	56	159	209	229	63	107	36	154	96	49	78	74	195	24	46
Sc	26.25	22.00	29.83	30.54	25.78	46.59	42.92	40.87	35.78	34.30	38.61	25.7	24.4	24.5	23.2	20.3
Rb	4.39	3.39	38.03	52.70	44.76	19.68	71.68	6.20	38.56	5.30	4.34	21.2	11.8	9.53	3.64	4.57
Hf	3.10	4.80	4.78	6.64	6.10	4.55	4.97	4.26	6.20	4.78	3.41	4.5	3.81	5.82	4.38	4.18
Zr	149	222	179	238	229	171	197	156	276	229	149	167	151	266	173	161
Nb	4.5	11.0	11.6	13.4	15.0	6.8	6.5	5.9	15.1	6.6	6.0	6.9	5.6	5.7	6.5	6
Cs	0.27	0.31	0.43	0.44	0.52	0.29	0.51	0.33	1.84	0.92	0.43	0.41	0.44	0.18	0.18	0.28
Cd	0.21	0.27	0.23	0.23	0.25	0.18	0.23	0.19	0.22	0.31	0.19	-	-	-	-	-
Th	0.97	1.37	1.28	1.34	2.20	0.96	1.01	0.86	0.90	0.88	1.01	1.07	0.45	1.44	1.47	1.3
U	0.72	0.58	0.53	0.68	0.80	0.43	0.74	0.37	0.54	0.49	0.46	0.31	0.28	0.66	0.56	0.3
Ta	0.28	1.04	0.71	0.96	0.92	0.67	0.53	0.60	1.01	0.53	0.55	0.56	0.45	0.48	0.53	0.5
W	0.24	0.33	0.33	0.44	0.42	0.31	0.28	0.28	0.26	0.32	0.28	-	-	-	-	-
Pb	1.2	1.3	5.2	6.3	7.5	2.8	4.4	3.6	6.2	3.2	5.4	5.9	2.9	3.3	5.7	4.1
Bi	0.06	0.10	0.28	0.26	0.28	0.14	0.13	0.10	0.08	0.10	0.22	-	-	-	-	-
Y	25.5	30.5	30.4	45.8	48.5	55.2	57.9	46.5	49.8	49.6	31.9	33	26.1	27.2	29	26.3

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表 4 后红泉剖面火山岩样品Sr-Nd同位素分析结果

Table 4. Sr-Nd isotopic compositions of the volcanic sample from Houhongquan profiles

样品号	Rb(10^-6)	Sr(10^-6)	⁸⁷Rb/⁸⁶Sr	⁸⁷Sr/⁸⁶Sr	±2σ	(⁸⁷Sr/⁸⁶Sr)_i	Sm(10^-6)	Nd(10^-6)	¹⁴⁷Sm/¹⁴⁴Nd	¹⁴³Nd/¹⁴⁴Nd	±2σ	ε_Nd(t)	数据来源
XWG9	4.39	379	0.033 5	0.705 57	0.000 02	0.705 44	4.22	16.40	0.156 6	0.512 778	0.000 008	4.13	本研究
XWG10	3.39	207	0.047 4	0.705 58	0.000 02	0.705 39	5.58	23.66	0.143 5	0.512 784	0.000 008	4.70
XWG22	38.03	472	0.233 1	0.707 33	0.000 01	0.706 43	4.82	19.80	0.148 2	0.512 521	0.000 010	-0.59
XWG23	52.70	401	0.380 2	0.705 18	0.000 02	0.703 71	5.87	25.36	0.140 9	0.512 787	0.000 012	4.86
XWG24	44.76	375	0.345 7	0.707 78	0.000 01	0.706 43	6.41	28.21	0.138 3	0.512 491	0.000 009	-0.83
XWG35	19.68	206	0.276 4	0.704 59	0.000 02	0.703 51	5.51	20.43	0.164 2	0.512 915	0.000 008	6.54
XWG36	71.68	237	0.875 3	0.705 42	0.000 01	0.702 02	5.73	20.79	0.167 7	0.512 593	0.000 064	0.13
XWG38	6.20	184	0.097 7	0.704 91	0.000 02	0.704 53	4.93	15.77	0.190 3	0.512 961	0.000 007	6.53
XWG42	38.56	496	0.225 2	0.706 55	0.000 02	0.705 68	6.20	24.45	0.154 3	0.512 888	0.000 009	6.36
XWG43	5.30	226	0.067 9	0.704 62	0.000 02	0.704 36	6.44	22.15	0.177 0	0.512 890	0.000 013	5.61
XWG45	4.34	212	0.059 2	0.705 41	0.000 02	0.705 18	4.39	19.13	0.139 7	0.512 743	0.000 009	4.04
16HHQ-H11	11.8	445	0.076 7	0.705 96	0.000 01	0.705 85	4.9	18.6	0.160 3	0.512 886	0.000 009	6.2	许伟等(2019)
16HHQ-H13	9.5	546	0.050 5	0.706 17	0.000 01	0.706 28	5.2	40.5	0.078 1	0.512 922	0.000 002	10
16HHQ-H18	4.6	285	0.043 2	0.706 49	0.000 01	0.706 31	4.9	19	0.157 0	0.512 697	0.000 004	2.7
16HHQ-H5	21.2	184	0.333 1	0.708 66	0.000 01	0.707 29	5.9	22.2	0.161 8	0.512 629	0.000 003	1.2
注：计算参数为(⁸⁷Sr/⁸⁶Sr)_i=(⁸⁷Sr/⁸⁶Sr)_S-(⁸⁷Rb/⁸⁶Sr)_S×(e^λ^t-1);λ=1.42×10^-11/a; ε(Sr)=[(¹⁴³Nd/¹⁴⁴Nd)_S/(¹⁴³Nd/¹⁴⁴Nd)_CHUR-1]×10 000; ε(Nd)=[(¹⁴³Nd/¹⁴⁴Nd)_S/(¹⁴³Nd/¹⁴⁴Nd)_CHUR-1]×10 000；t代表样品形成时间; (¹⁴⁷Sm/¹⁴⁴Nd)_CHUR=0.196 7；(¹⁴³Nd/¹⁴⁴Nd)_CHUR=0.512 638.

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甘蒙北山后红泉地区海相玄武岩地球化学、年代学特征及成因

doi: 10.3799/dqkx.2020.378

作者简介:
郭小刚(1989-), 男, 硕士研究生, 工程师, 主要研究矿产资源综合勘查与评价.ORCID: 0000-0003-4784-9741.E-mail: 491935960@qq.com

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陈守余, E-mail: sychen@cug.edu.cn

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Geochemistry, Chronology and Genesis of Marine Basalts in Houhongquan Area, Beishan, Gansu and Inner Mongolia

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甘蒙北山后红泉地区海相玄武岩地球化学、年代学特征及成因

doi: 10.3799/dqkx.2020.378

作者简介: 郭小刚(1989-), 男, 硕士研究生, 工程师, 主要研究矿产资源综合勘查与评价.ORCID: 0000-0003-4784-9741.E-mail: 491935960@qq.com

通讯作者: 陈守余, E-mail: sychen@cug.edu.cn

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Geochemistry, Chronology and Genesis of Marine Basalts in Houhongquan Area, Beishan, Gansu and Inner Mongolia

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出版历程

目录

作者简介:
郭小刚(1989-), 男, 硕士研究生, 工程师, 主要研究矿产资源综合勘查与评价.ORCID: 0000-0003-4784-9741.E-mail: 491935960@qq.com

通讯作者:
陈守余, E-mail: sychen@cug.edu.cn