南极横贯南极山脉休斯陡崖花岗质岩体的成因

崔迎春; 马立杰; 刘晨光; 王庆超; LÄUFERAndreas

doi:10.12090/j.issn.1006-6616.2021.27.05.064

南极横贯南极山脉休斯陡崖花岗质岩体的成因

doi: 10.12090/j.issn.1006-6616.2021.27.05.064

崔迎春^{1, 2, 3,},
马立杰^{4, 5},
刘晨光^{1, 2, 3},
王庆超¹,
LÄUFERAndreas⁶

1.
自然资源部第一海洋研究所, 海洋地质与地球物理实验室, 山东青岛 266061
2.
自然资源部海洋地质与成矿作用重点实验室, 山东青岛 266061
3.
青岛海洋科学与技术试点国家实验室, 海洋地质过程与环境功能实验室, 山东青岛 266237
4.
中科院青岛海洋研究所, 中国科学院海洋地质与环境重点实验室, 山东青岛 266071
5.
青岛海洋科学与技术试点国家实验室, 海洋矿产资源评价与探测技术功能实验室, 山东青岛 266237
6.
Federal Institute for Geosciences and Natural Resources, Hannover 30655, Germany

基金项目:

国家自然科学基金 91958216

国家自然科学基金 41876227

极地考察业务化与科研 JD0620010

极地考察业务化与科研 JD0620020

详细信息

作者简介:
崔迎春(1976-), 男, 博士, 高级工程师, 矿物学、岩石学、矿床学专业。E-mail: cuiyingchun@fio.org.cn

中图分类号: P581
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- 被引次数: 0
出版历程
- 收稿日期: 2021-05-30
- 修回日期: 2021-08-30
- 预出版日期: 2021-12-31
- 刊出日期: 2021-10-28

Petrogenesis of the Hughes Bluff granitic pluton in the Transantarctic Mountains, Antarctica

CUI Yingchun^{1, 2, 3
,},
MA Lijie^{4, 5},
LIU Chenguang^{1, 2, 3},
WANG Qingchao¹,
LÄUFER Andreas⁶

1.
Lab of Marine Geology and Geophysics, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, Shandong, China
2.
Key Laboratory of Marine Geology and Metallogeny, Ministry of Natural Resources, Qingdao 266061, Shandong, China
3.
Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, Shandong, China
4.
Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Science, Qingdao 266071, Shandong, China
5.
Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, Shandong, China
6.
Federal Institute for Geosciences and Natural Resources, Hannover 30655, Germany

Funds:

the National Natural Science Foundation of China 91958216

the National Natural Science Foundation of China 41876227

the projects of Polar Operation and Scientific Research JD0620010

the projects of Polar Operation and Scientific Research JD0620020

摘要

摘要: 为了探讨横贯南极山脉休斯陡崖花岗质岩体的岩石成因，对其开展了岩相学和岩石化学分析。结果表明，休斯陡崖岩体主体岩石为二长花岗岩，后期被细粒二长花岗岩岩脉侵入。二者都具有高硅、富碱和高钾特征，里特曼指数小于3，岩石铝饱和指数(A/CNK)值小于1；微量元素原始地幔标准化分布型式具有Rb、Th、U和K元素富集，Nb、Ta、Nd和Ti等元素亏损特征；稀土元素总量偏低，轻稀土富集。主期二长花岗岩的稀土元素球粒陨石标准化分布型式具有轻微的负Eu异常，而岩脉具有正的Eu异常。休斯陡崖岩体的岩石类型为钙碱性准铝质I型花岗岩，源区为下陆壳，并伴有幔源物质的混入。在源区，岩浆发生了不同程度的斜长石、钛铁矿、金红石和磷灰石的分离结晶作用，其形成的构造环境为与俯冲作用有关的火山岛弧环境。
- 横贯南极山脉 /
- 地球化学 /
- 花岗质岩石 /
- I型花岗岩
Abstract: In order to elucidate the petrogenesis of the Hughes Bluff granitic pluton, the petrological and geochemical studies were conducted, and the results show that the Hughes Bluff granitic pluton is composed of monzogranite, intruded by fine-grained monzogranite dikes in the later period. They both are characterized by high abundance of silicon, alkali and potassium, enriched in Rb, Th, U and K and depleted in Nb, Ta, Nd and Ti relative to those of the primitive mantle, with the Rittmann Indexes less than 3 and the A/CNK values less than 1. They both also have a low total amount of rare earth elements and an abundance of light rare earth, showing weakly negative Eu anomaly and slightly positive Eu anomaly in the chondrite-normalized REE pattern for the monzogranite and granitic monzogranite dike respectively. All the data show that the rocks from the Hughes Bluff granitic pluton belong to the I-type granites, and the source region is probably the lower continental crust, but the contribution of mantle material cannot be ruled out. The magma in the source region underwent varying degrees of fractional crystallization of plagioclase, ilmenite, rutile and apatite, and was derived from a volcanic island arc environment related to subduction.
- the Transantarctic Mountains /
- Petrogenesis /
- Pluton /
- I-type granite

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图 1 休斯陡崖区域地质简图及地貌特征

a-南极北维多利亚地地质构造图(底图据Ferraccioli and Bozzo, 1999; Läufer et al., 2005修改)；b-休斯陡崖采样位置；c、d-采样点地貌特征

Figure 1. The generalized geologic map and geomorphic features of the Hughes Bluff region

(a) Geological sketch map of Northern Victoria Land, Antarctica (modified after Ferraccioli & Bozzo, 1999; Läufer et al., 2005); (b) Sampling locations in the Hughes Bluff region; (c and d)Geomorphic features of the sampling locations

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图 2 休斯陡崖岩体二长花岗岩及二长花岗岩脉野外露头接触关系及显微照片

Qtz-石英；Pl-斜长石；Bt-黑云母；Chl-绿泥石；Cb-碳酸盐矿物
a-35LC108-2样品宏观照片；b-二长花岗岩(35LC108-2)显微照片(正交偏光)；c-二长花岗岩与细粒二长花岗岩脉野外照；d-35LC108-3样品宏观照片；e-细粒二长花岗岩(35LC108-3)显微照片(正交偏光)

Figure 2. Outcrop and photomicrographs of the Hughes Bluff pluton

(a)Photograph of the sample 35LC108-2; (b) Photomicrograph of the monzogranite sample 35LC108-2 (crossed-polarized light); (c)Photograph of the outcrop of monzogranite and dyke; (d) Photograph of the sample 35LC108-3; (e) Photomicrograph of the fine-grained monzogranite sample 35LC108-3 (crossed-polarized light)
Qtz-quartz; Pl-plagioclase; Bt-biotite; Chl-chlorite; Cb-carbonate

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图 3 休斯陡崖岩体稀土元素球粒陨石标准化配分模式图与微量元素原始地幔标准化蛛网图(球粒陨石和原始地幔数据据Sun and McDonough, 1989)

a-微量元素原始地幔标准化蛛网图；b-稀土元素球粒陨石标准化配分模式图

Figure 3. Primitive mantle (PM) normalized spider diagram (a) and chondrite-normalized REE pattern (b) for the Hughes Bluff pluton (Chondrite and PM values used for normalization are from Sun and McDonough, 1989)

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图 4 休斯陡崖花岗岩成因类型判别图解

a-休斯陡崖花岗质样品的(K₂O+Na₂O)/CaO-(Zr+Nb+Ce+Y)图解(底图据Whalen et al., 1987)；b-休斯陡崖花岗质样品的TiO₂-Zr图解(底图据刘洪等, 2016)

Figure 4. Petrogenesis discrimination diagrams for the Hughes Bluff granitic pluton

(a) (K₂O+Na₂O)/CaO-(Zr+Nb+Ce+Y) diagram (modified after Whalen et al., 1987); (b) TiO₂-Zr diagram (modified after Liu et al., 2016)

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图 5 休斯陡崖岩体微量元素构造环境判别图

ORG-大洋中脊花岗岩；WPG-板内花岗岩；VAG-火山弧花岗岩；Syn-CLOG-同碰撞花岗岩；Post-CLOG-后碰撞花岗岩
a-Y-Nb构造环境判别图(底图据Pearce et al., 1984)；b-(Y+Nb)-Rb构造环境判别图(底图据Pearce, 1996)

Figure 5. Diagrams showing the tectonic setting of Y-Nb(a) and (Y+Nb)-Rb(b) for the Hughes bluff pluton (a after Pearce et al., 1984; b after Pearce, 1996)

ORG-oceanic ridge granites; WPG-within-plate granites; VAG-volcanic arc granites; Syn-CLOG-syncollisional granites; Post-CLOG-postcollisional granites

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表 1 休斯陡崖岩体主量元素分析结果

Table 1. Major element results of the Hughes Bluff pluton

主量元素含量/%	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	LOI	总和	Mg^#	石英	斜长石	正长石	刚玉	透辉石	紫苏辉石	钛铁矿	磁铁矿	磷灰石
35LC108-2	70.5	0.35	14.00	2.43	0.04	0.87	2.01	3.86	4.42	0.48	0.84	99.8	41.55	25.55	40.22	26.71	0.64	0.00	3.95	0.53	0.29	0.83
35LC108-3	74.47	0.12	13.36	1.53	0.02	0.22	1.63	4.06	4.17	0.11	0.64	100.33	22.28	30.92	40.45	24.76	0.00	1.28	1.88	0.23	0.22	0.25
35LC108-4	71.20	0.28	14.00	1.94	0.04	0.62	1.49	4.07	4.44	0.35	0.61	99.04	38.92	25.87	40.00	26.48	0.36	0.00	5.14	0.66	0.36	1.14
注：矿物含量来自于CIPW标准矿物的计算结果；Mg^#=100×Mg²⁺/(Mg²⁺+Fe²⁺)

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表 2 休斯陡崖岩体微量元素分析结果

Table 2. Trace element results of the Hughes Bluff pluton

微量元素含量/×10^-6	Ba	Sr	Zn	Zr	Li	Be	Sc	V	Cr	Co	Ni	Cu	Ga	Ge	Rb	Y	Nb	Mo	Cd	Cs	Hf	Ta	W	Tl	Pb	Bi	Th	U
35LC108-2	1231.89	625.32	48.06	179.72	36.12	2.91	2.48	9.45	1.06	2.54	0.8	4.19	19.17	0.84	133.03	10.14	11.64	0.78	-	2.07	4.76	1.24	0.27	0.84	23.67	0.03	14.55	2.14
35LC108-3	1124.32	369.72	28.62	112.33	26.15	2.15	1.21	2.17	0.44	0.96	0.27	0.65	13.29	0.92	138.87	8.42	6.19	4.60	0.02	1.85	3.16	0.71	0.33	0.71	37.77	0.03	10.32	2.00
35LC108-4	1172.63	521.56	52.35	178.86	27.12	2.52	1.59	8.29	1.36	2.37	0.55	0.41	17.16	0.99	149.48	8.98	9.99	0.11	0.02	4.20	4.90	0.79	0.28	0.69	30.40	0.03	17.46	2.61
注：-低于检测限

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表 3 休斯陡崖岩体稀土元素分析结果

Table 3. Rare earth element results of the Hughes Bluff pluton

稀土元素含量/×10^-6	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	ΣREE	La_N/Yb_N	Eu_N
35LC108-2	32.89	58.20	6.27	20.49	3.24	0.79	2.39	0.30	1.51	0.32	0.90	0.16	1.15	0.17	128.76	19.36	0.83
35LC108-3	25.04	41.73	4.47	14.76	2.27	0.75	1.80	0.25	1.41	0.30	0.89	0.15	1.08	0.17	95.05	15.71	1.10
35LC108-4	29.47	54.01	5.81	19.97	3.30	0.70	2.50	0.33	1.68	0.32	0.88	0.13	0.84	0.13	120.06	23.70	0.72

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