北大西洋Logatchev热液区多形貌黄铁矿特征及其意义

刘开君; 黄菲; 高尚; 张志彬; 安佰高; 黎永丽

doi:10.3799/dqkx.2018.414

北大西洋Logatchev热液区多形貌黄铁矿特征及其意义

doi: 10.3799/dqkx.2018.414

1.
东北大学资源与土木工程学院, 辽宁沈阳 110819
2.
石家庄铁道大学土木工程学院, 河北石家庄 050043

基金项目:

中国科学院地球与行星物理重点实验室开放基金项目 DQXX201706

中国科学院矿物学和成矿学重点实验室开放基金项目 KLMM20150101

海洋地质国家重点实验室（同济大学）开放基金项目 MGK1403

国家自然科学基金项目 41272062

详细信息

作者简介:
刘开君(1990-), 男, 博士研究生, 成因矿物学研究方向

通讯作者:
黄菲

中图分类号: P571
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- 被引次数: 0
出版历程
- 收稿日期: 2018-01-11
- 刊出日期: 2018-05-15

Characteristics and Research Significance of Polymorphic Pyrite in Logatchev Hydrothermal Area, North Atlantic

1.
College of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
2.
School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China

摘要

摘要: 北大西洋Logatchev热液区产出的黄铁矿形貌丰富、成分各异，极具特殊性和代表性.运用扫描电镜和电子探针系统观测黄铁矿矿物学特征，发现粒状黄铁矿粒径不一，具高Fe、S，低微量元素的特点；草莓状黄铁矿见有松散莓体、球形-次球形莓体和自形结构莓体，其Cu含量总体较高，不同晶体特征的莓体成分存在差异；胶状黄铁矿见有多层环带，内核到环带由纳微米晶体聚合生成，由内到外成分具有S/Fe比、Zn含量减小，As含量增大的趋势.分析认为早期粒状黄铁矿是在较高温度下的热液体系中直接形成，随热液作用衰减，生成的粒状黄铁矿多呈纳-微米晶产出；草莓状黄铁矿是由松散纳-微米晶逐步聚集形成，受溶液过饱和度影响，莓体粒度和聚集程度存在差异；胶状黄铁矿多晶聚集环带生长方向是由内向外的，聚集程度差异指示沉积环境的反复交替.研究区多形貌黄铁矿具有由分散的微晶→多晶聚合体→自形单晶的完整演化系列特征，对于解读现代海底热液活动的方式和特点，揭示纳米晶体-宏观晶体的演化过程有积极意义.
- Logatchev热液区 /
- 多形貌黄铁矿 /
- 演化过程 /
- 矿物学
Abstract: The variety of morphology and compositions of pyrite in the Logatchev hydrothermal area of North Atlantic is particular and representative. In this paper, it analyzes the mineralogical characteristics of pyrite systematically by scanning electron microscopy (SEM) and electron probe microanalysis(EPMA). It is found that the size of granular pyrite is inhomogeneous with high contents of Fe and S and low contents of trace elements. There are three types of pyrite framboids in this area:loosely arranged framboids, spherical framboids and framboids with enhedral crystal structure. The content of Cu in framboids is large, and the different framboid crystals have different chemical compositions. Part of colloidal pyrite develops multilayer girdles, and it is formed by the polymerization of nano-micro pyrite crystals. From the core to the girdles, the contents of S/Fe and Zn show a decreasing trend, while the As content shows an increasing tendency. The analyses show that the earlier granular pyrite is formed directly in a hydrothermal system at higher temperatures, the formation of pyrite is mainly composed of nano and micro pyrite crystals with the attenuation of hydrothermal action. The loosely nano and micro pyrite crystals have a tendency to aggregate framboids. The size and accumulation of framboids vary with the change of the super saturation of solution. The growth of polycrystalline aggregation is from inside girdle to outside girdle, and the difference of aggregation of girdles indicates the alternation of metallogenic environment. Multi-morphologies of pyrite in the area have a complete evolution series from dispersed microcrystals to polycrystalline aggregate to euhedral crystal, which is significant to the understanding of the ways and characteristics of modern seafloor hydrothermal activity and the exploration of the evolution process of the nano crystalline crystal.
- Logatchev hydrothermal area /
- polymorphic pyrite /
- evolutionary process /
- mineralogy

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图 1 北大西洋Logatchev热液区地质概况以及取样位置

据Schmidt et al.(2007)

Fig. 1. Geological survey and sampling position of Logatchev hydrothermal region, North Atlantic

下载: 全尺寸图片幻灯片

图 2 样品手标本照片

a.完整的手标本；b.x轴方向的手标本特征；c.x轴方向的手标本切面；d.z轴方向的手标本特征

Fig. 2. Hand specimen photographs

下载: 全尺寸图片幻灯片

图 3 研究区主要矿物组成和结构特征反射光照片

a.长石晶屑；b.蚀变橄榄石；c.细粒黄铁矿与纤锌矿伴生；d.他形晶粒状白铁矿；e.交代结构；f.铜蓝包裹不规则形状的黄铜矿和闪锌矿形成反应边结构；g.骸晶结构；h.镶边结构；i.黄铁矿呈他形粒状与闪锌矿共生；Wur.纤锌矿；Py.黄铁矿；Mrc.白铁矿；Ccp.黄铜矿；Sp.闪锌矿；Cv.铜蓝

Fig. 3. Main mineral compositions and structural characteristics in the study area

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图 4 粒状黄铁矿的反射光照片和扫描电镜照片

Fig. 4. Optical microscope photographs and BSE images of granular pyrite

下载: 全尺寸图片幻灯片

图 5 草莓状黄铁矿的扫描电镜图像

Fig. 5. BSE images of framboid pyrites distributed in the Logatchev sample

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图 6 胶状黄铁矿的扫描电镜和反射光照片

Fig. 6. Optical microscope photographs and BSE images of colloidal pyrite

下载: 全尺寸图片幻灯片

表 1 多形貌黄铁矿EPMA分析结果(%)

Table 1. EPMA analysis results of polymorphic pyrite (%)

黄铁矿特征	As	S	Pb	Fe	Cu	Zn	Co	Ag	Au	Ni	Si	O	Total	S/Fe	Co/Ni
自形-半自形黄铁矿	0.05	53.48	0.00	46.15	0.04	0.00	0.05	0.00	0.02	0.00			99.79	2.03
	0.03	52.84	0.00	46.24	0.07	0.01	0.10	0.01	0.30	0.01			99.59	2.00	10.00
	0.11	53.23	0.11	45.86	0.08	0.07	0.06	0.03	0.00	0.00			99.54	2.03
	0.00	53.46	0.02	46.30	0.08	0.01	0.08	0.00	0.04	0.00			99.98	2.02
	0.02	53.46	0.09	46.00	0.00	0.01	0.05	0.00	0.03	0.00			99.66	2.03
	0.07	53.00	0.00	46.34	0.00	0.00	0.07	0.00	0.00	0.02			99.50	2.00	3.50
	0.06	53.30	0.04	46.36	0.04	0.00	0.08	0.01	0.00	0.00			99.89	2.01
松散的莓体	0.00	45.45	0.05	39.47	0.13	0.01	0.06			0.00	5.40	6.23	96.80	2.02
松散的莓体	0.00	45.13	0.00	40.01	0.04	0.00	0.08			0.00	6.34	12.15	103.75	1.97
球形莓体	0.11	51.32	0.03	44.62	0.16	0.02	0.11			0.01	0.47	1.13	97.96	2.01	11.00
球形莓体	0.00	52.62	0.00	44.02	0.16	0.05	0.09			0.00	0.89	1.26	99.09	2.09
自形结构莓体	0.00	52.47	0.00	46.13	0.06	0.05	0.10			0.00	0.25	0.78	99.84	1.99
自形结构莓体	0.05	52.65	0.00	46.26	0.00	0.04	0.07			0.00	0.11	0.32	99.50	1.99
紧密排列莓体	0.10	52.91	0.02	45.99	0.22	0.03	0.06	0.01	0.00	0.01			99.36	2.01	6.00
	0.05	53.69	0.04	46.39	0.12	0.07	0.08	0.00	0.00	0.02			100.46	2.03	4.00
	0.06	53.76	0.00	46.16	0.12	0.01	0.07	0.00	0.00	0.00			100.18	2.04
	0.04	53.21	0.03	46.34	0.47	0.03	0.07	0.00	0.01	0.04			100.25	2.01	1.75
	0.10	52.75	0.02	45.91	0.09	0.03	0.09	0.00	0.01	0.00			98.99	2.01
	0.08	53.51	0.02	46.04	0.26	0.01	0.01	0.02	0.03	0.00			99.99	2.03
	0.03	53.47	0.00	46.66	0.07	0.07	0.03	0.02	0.02	0.00			100.35	2.01
	0.04	53.14	0.00	46.56	0.26	0.02	0.05	0.00	0.03	0.00			100.10	2.00
胶状黄铁矿	0.60	53.52		45.09		0.02	0.02	0.01	0.22	0.02			99.50	2.08	1.00
	0.63	53.61		44.90		0.01	0.05	0.00	0.07	0.01			99.29	2.09	5.00
	0.63	53.49		45.67		0.02	0.04	0.01	0.07	0.03			99.95	2.05	1.33
	0.64	53.61		45.52		0.00	0.03	0.00	0.00	0.00			99.80	2.06
	0.60	53.53		45.69		0.00	0.02	0.03	0.12	0.01			100.00	2.05	2.00
	0.66	51.46		43.92		0.00	0.01	0.01	0.13	0.02			96.20	2.05	0.50
注：胶状黄铁矿环带EPMA分析结果顺序为由内到外.

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