富钴铁锰结壳的控矿要素和成矿过程-矿物岩石地球化学通报.PDF

Bulletin of Mineralogy, Petrology and Geochemistry Vol27 No3, July 2008 ! ! ! 以西太平洋为例 1 1 1 2 石学法 , 任向文 , 刘季花 , S. I. Andreev 1. , , 2 0 1; 2. , , ∀ : 以西太平洋海山的麦哲伦海山群和马尔库斯威克海山群为例, 研 了富钴铁锰结壳( 富钴结壳) 形成过程中地质要素 和海洋要素的作用, 重点分析了海山漂移和沉降水道开合最小含氧带( OMZ) 大洋环流, 以及气候变化等要素对富钴结壳 形成的控制作用基于对麦哲伦海山和马尔库斯威克海山结壳样品剖面M n/ Fe 值曲线的综合研 , 结合控矿要素和成矿背 景分析, 将该区白垩纪以来富钴结壳的成矿过程划分为五个阶段: ( 1) 白垩纪- 始新世, ( 2) 始新世末- 晚渐新期, ( 3) 晚渐新期 - 中中新期早期, ( 4) 中中新期早期- 晚中新期早期, ( 5) 晚中新期早期- 现代, 其中( 2) ( 3) 阶段有利于发育富钴结壳 ∀ ∀ : 富钴结壳; 控矿要素; 成矿过程和阶段; 西太平洋 : P 1831/ 32/ 2∀ ∀ : A ∀ ∀ :2008) Orecontrolling Factors and Oreforming Processes of Corich FeMn Crust: An Example f rom Western Pacific 1 1 1 2 SHI Xuefa , REN Xiangw en , LIU Jihua , S. I. Andreev 1. K ey L aboratory of Marine Sedimentology and E nv ironmental Geology , First Institute of Oceanograp hy , State Oceanic dministration, Qingdao, 2 0 1 China; 2. VN II OK eangeologia, S t. Petersburg, 190121, Russia Abstract:T aking the Magellan Seamount Cluster and the Marcuswake Seamount Cluster of the w estern Pacific O cean as an ex ample, we studied the geological and oceanographical orecontrolling factors, especially the constraints of drifting and subsidence of seamounts, opening and closing of seaw ays, variation of oxygen minimum zone, varia tion of ocean circulation, and change of climate, on the formation of Corich FeMn crusts. Based on integrated re searches on the Mn/ Fe curves of two Corich FeMn crusts sections from Magellan Seamount C