胶东招平断裂带围岩蚀变地球化学特征

张志航; 胡宝群; 王玺; 申玉科; 郭涛; 吕古贤

胶东招平断裂带围岩蚀变地球化学特征

1.
东华理工大学地球科学学院, 江西抚州 344000
2.
中国地质科学院地质力学研究所, 北京 100081

基金项目:

中国地质调查局地质矿产调查评价项目"胶东招平断裂带中段构造解析与靶区验证 12120113096300

国家自然科学基金项目 41172078

国家自然科学基金项目 40862005

详细信息

作者简介:
张志航(1988-), 男, 江西抚州人, 硕士研究生。地质学专业。E-mail:zhangzhihangdeyou@126.com

中图分类号: P632
计量
- 文章访问数: 106
- HTML全文浏览量: 40
- PDF下载量: 22
- 被引次数: 0
出版历程
- 收稿日期: 2014-11-06
- 刊出日期: 2015-03-28

THE WALL ROCK ALTERATION AND ITS GEOCHEMICAL CHARACTERISTICS OF ZHAOPING FAULT ZONE IN JIAODONG

1.
College of Geosciences, East China Institute of Technology, Fuzhou 344000, Jiangxi, China
2.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

摘要

摘要: 招平断裂带是胶东地区重要的金成矿带, 众多蚀变型、石英脉型金矿床产出于该带及下盘次级断裂中。以招平断裂带破头青断裂为研究对象, 进行剖面测量和取样测试分析, 探讨围岩蚀变地球化学特征。研究结果显示, 招平断裂带破头青断裂蚀变分带明显, 不同蚀变强度的蚀变岩中常量元素迁移规律明显, REE配分曲线表现为HREE富集, Eu、Ce均有较明显的负异常, 从弱蚀变至强蚀变过程中, ΣREE、LREE和HREE均有明显降低, 且相应特征值表现出规律的变化, Au-Ag-Bi-Co-Cu-Mo-Ni-Pb-Zn是金成矿密切相关的指示元素组合。
- 招平断裂带 /
- 地球化学特征 /
- 胶东
Abstract: Zhao-Ping fault belt is an important gold metallogenic belt in Jiaodong area, and lots of altered-rock-types and quartz-vein-type gold deposits output in the belt and secondary faults of the footwall. To explore the geochemical features of the wall rock alteration, the Potouqing fault in Zhao-ping fault belt is taken as the research object, with the profile measuring and sample analyzing. It's showed that the alteration zones of the Potouqing fault are evident in Zhaoping fault belt. With the different alteration intensities in altered rock, the major elements' migration regularity is obvious. The enrichment of HREE is showed in the REE distribution curve. Eu and Ce have obviously negative anomaly. With the process from weak alteration to strong alteration, theΣREE, LREE and HREE significantly decrease, and the regular changes are showed by the corresponding characteristic value, Au-Ag-Bi-Co-Cu-Mo-Ni-Pb-Zn is the indicator element suite which is closely related to the gold mineralization.
- Zhaoping fault zone /
- geochemical characteristics /
- Jiaodong

HTML全文

图 1 胶东西北部金矿区域地质图^[8]

1－第四系；2－新第三系；3－白垩系；4－侏罗系；5－蓬莱群；6－粉子山群；7－荆山群；8－胶东岩群；9－玲珑花岗岩；10－郭家岭花岗岩；11－栖霞复背斜轴；12－新华夏系压扭性断裂；13－华夏系压扭性断裂；14－金矿床；15－研究区

Figure 1. The regional geological map of the Jiaodong northwestern gold deposit

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图 2 招平断裂带破头青断裂样品稀土元素配分曲线图解

Figure 2. Match points curve diagram of REE in samples of Potouqing fault in Zhaoping fault zone

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表 1 招平断裂带破头青断裂常量元素成分(%)

Table 1. The major element constituents of Potouqing fault in Zhaoping fault zone

样品号	SiO₂	Al₂O₃	CaO	TiO₂	Fe₂O₃	K₂O	MgO	MnO	Na₂O	P₂O₅	LOI	Total
1015-1	75.24	13.51	0.39	0.08	1.08	3.84	0.11	0.02	4.31	0.018	1.12	99.79
1015-2	72.10	14.73	0.41	0.12	1.23	4.10	0.11	0.02	4.54	0.021	0.93	98.42
1015-3	76.97	13.37	0.12	0.08	1.13	3.45	0.18	0.01	2.84	0.031	1.58	99.90
1015-4	77.42	12.97	0.11	0.07	1.07	3.64	0.15	0.01	3.25	0.021	1.19	100.00
1015-5	74.91	14.34	0.09	0.09	0.96	3.68	0.19	0.03	3.84	0.025	1.24	99.53
1015-7	73.60	13.28	1.17	0.07	1.61	3.36	0.23	0.09	4.17	0.025	1.98	99.77
1015-9	73.68	13.29	1.04	0.08	0.81	3.61	0.10	0.03	4.36	0.021	1.52	98.65
1015-11	72.43	13.37	2.14	0.09	0.97	4.06	0.13	0.04	3.97	0.024	2.45	99.87
1015-13	75.51	13.76	0.07	0.08	0.89	4.08	0.15	0.02	4.54	0.026	0.72	99.98
注：1015-1、1015-2为弱钾化花岗岩；1015-3、1015-4为强钾化花岗岩；1015-5、1015-7、1015-9、1015-11、1015-13为绢英岩

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表 2 招平断裂带破头青断裂稀土元素含量(μg/g)及其特征参数

Table 2. The content of REE and characteristic parameters of Potouqing fault in Zhaoping fault zone

样品号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Y	ΣREE	LREE	HREE	LREE/HREE	(La/Yb)_N	δEu	δCe
1015-1	27.6	57.6	6.25	22.4	4.83	0.44	3.44	0.49	2.62	0.51	1.19	0.19	1.35	0.20	15.4	129.11	119.12	8.25	11.92	13.82	0.31	1.00
1015-2	23.7	43.6	4.61	15.4	3.13	0.48	2.07	0.29	1.48	0.27	0.70	0.10	0.57	0.10	8.3	96.50	90.92	4.81	16.29	28.10	0.54	0.93
1015-3	25.0	44.2	4.75	16.1	3.14	0.48	2.20	0.38	2.16	0.37	1.12	0.17	0.97	0.14	13.0	101.18	93.67	6.23	12.47	17.42	0.53	0.90
1015-4	20.9	37.2	3.99	13.2	2.59	0.33	1.53	0.22	1.22	0.22	0.60	0.08	0.54	0.07	6.9	82.69	78.21	3.79	17.46	26.15	0.47	0.90
1015-5	25.2	42.7	4.85	17.2	3.32	0.52	2.25	0.34	1.88	0.33	0.93	0.12	0.71	0.10	9.9	100.45	93.79	5.73	14.08	23.98	0.55	0.86
1015-7	18.2	33.5	3.57	12.6	2.40	0.40	1.81	0.28	1.47	0.30	0.72	0.11	0.71	0.10	8.9	76.17	70.67	4.58	12.85	17.32	0.56	0.93
1015-9	20.6	37.9	3.94	13.1	2.93	0.43	1.89	0.27	1.80	0.34	1.01	0.13	0.73	0.10	9.9	85.17	78.90	5.31	12.58	19.07	0.52	0.93
1015-11	19.3	35.5	3.61	12.3	2.38	0.48	1.82	0.30	1.56	0.27	0.79	0.11	0.67	0.10	8.3	79.19	73.57	4.74	13.09	19.47	0.68	0.94
1015-13	17.7	32.7	3.45	11.9	2.21	0.38	1.77	0.27	1.75	0.33	0.86	0.12	0.85	0.11	9.6	74.40	68.34	4.98	11.28	14.07	0.57	0.93
注：1015-1、1015-2为弱钾化花岗岩；1015-3、1015-4为强钾化花岗岩；1015-5、1015-7、1015-9、1015-11、1015-13为绢英岩

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表 3 招平断裂带破头青断裂微量元素含量(μg/g)

Table 3. Trace element constituents of Potouqing fault in Zhaoping fault zone

样品号	Au	Ag	As	Bi	Co	Cu	Hg	Mo	Ni	Pb	Sb	Sn	W	Zn
1015-1	0.001	0.06	0.2	0.03	1	1	< 0.005	0.52	2	47	< 5	3	< 1	30
1015-2	0.001	0.02	0.1	0.01	1	1	< 0.005	0.28	1	28	< 5	2	< 1	48
1015-3	0.001	0.02	0.1	0.01	1	2	< 0.005	0.28	4	25	5	3	< 1	96
1015-4	0.001	0.01	0.3	0.01	1	1	< 0.005	0.31	3	24	< 5	2	< 1	70
1015-5	0.001	0.03	0.1	0.05	1	2	< 0.005	0.34	2	48	< 5	2	2	64
1015-7	0.002	0.06	0.1	0.06	2	2	< 0.005	0.57	14	24	< 5	2	1	84
1015-9	0.001	0.02	0.1	0.01	1	2	< 0.005	0.45	1	23	< 5	2	1	47
1015-11	0.002	0.26	0.1	0.04	1	1	< 0.005	0.43	1	100	< 5	1	1	66
1015-13	0.001	0.03	0.1	0.04	1	1	< 0.005	0.72	3	26	5	1	1	75

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表 4 招平断裂带破头青断裂微量元素相关系数矩阵

Table 4. Trace elements correlation matrix of Potouqing fault in Zhaoping fault zone

	Au	Ag	As	Bi	Co	Cu	Mo	Ni	Pb	Sn	W	Zn
Au	1.00
Ag	0.75	1.00
As	-0.27	-0.20	1.00
Bi	0.61	0.36	-0.33	1.00
Co	0.66	0.02	-0.18	0.59	1.00
Cu	0.06	-0.29	-0.45	0.17	0.40	1.00
Mo	0.25	0.12	-0.19	0.57	0.34	-0.15	1.00
Ni	0.56	-0.09	-0.10	0.55	0.97	0.42	0.33	1.00
Pb	0.53	0.93	-0.14	0.33	-0.21	-0.31	-0.02	-0.32	1.00
Sn	-0.40	-0.47	0.25	-0.36	0.00	0.34	-0.41	0.09	-0.38	1.00
W	-0.19	-0.13	-0.18	0.40	-0.13	0.40	-0.23	-0.13	0.14	0.00	1.00
Zn	0.30	-0.01	-0.20	0.20	0.36	0.39	-0.02	0.52	-0.17	-0.13	-0.01	1.00
注：1015-1、1015-2为弱钾化花岗岩；1015-3、1015-4为强钾化花岗岩；1015-5、1015-7、1015-9、1015-11、1015-13为绢英岩

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