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大西洋中脊胶状黄铁矿的特征及其成因
初凤友, 陈丽蓉
中国科学院海洋研究所 青岛 266071
摘要:
大西洋中脊热液硫化物（矿床）中广泛出现松散粒状和胶状黄铁矿，利用1988年所采样品通过其形态、成份和热电性质的研究，对这种黄铁矿的成因、环带成因和热液演化特征进行初步探讨。结果表明，松散粒状和胶状黄铁矿是热液进入海底与海水混合后沉积形成，与固结粒状黄铁矿分属不同矿化阶段（期），反映热液活动的多阶段成矿特征；胶状黄铁矿环带和微环带是黄铁矿胶体沉淀后重结晶作用形成的；松散粒状黄铁矿和胶状黄铁矿同时出现是已经停止活动的烟囱物特征。
关键词:  胶状黄铁矿  流体混合  大西洋中脊
DOI：
分类号:
基金项目:博士后基金资助
CHARACTERISTICS AND ORIGIN OF COLLOID FORM PYRITE FROM THE MID-ATLANTIC RIDGE
Chu Fengyou, Chen Lirong
Institute of Oceanology, Academia Sinica, Qingdao 266071
Abstract:
Hydrothermal sulfide sampled from the Mid-Atlantic Ridge in 1988 was rich in loose granular and colloid form pyrite whose morphology, composition and thermoelectricity characteristics, were studied by authors in their research on the pyrite origin, girdle origin and hydrothermal evolution characteristics. The results suggest that loose granular and colloid form pyrite deposited and formed after the hydrothermal sulfide and the seawater mixed. These pyrites belonging respectively to different minerogenetic stages of the consolidated granular pyrite, reflected the multiple stage minerogenetic characteristics of hydrothermal activities. Colloid form pyrite girdles and microgirdles were formed by recrystallization after pyrite colloid had deposited. Concurrence of loose granular and colloform pyrites are the characteristics of the stopped-active chimney.
Key words:  Colloid form pyrite, Fluid mixing, Mid-Atlantic Ridge
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