南海铁锰结核(壳)的元素地球化学研究

GEOCHEMISTRY OF ELEMENTS IN FERROMANGANESE NODULES(CRUSTS)FROM THE SOUTH CHINA SEA

本文利用南海11个铁锰结核(壳)样品的化学分析资料,研究了铁锰结核(壳)中Fe,Mn,Cu,Co,Ni,Pb,Zn,Cr,K,Na,Ca,Mg,Si,P,Al,Ti,Sr,Ba及∑REE的元素地球化学特征。结果表明:(1)铁锰结核(壳)以高Fe,∑REE,低Mn,Cu,Co,Ni等元素为主要特征;(2)铁锰结核(壳)中Fe,Mn间无明显相关,而Fe与∑REE,∑Ce,∑Y呈弱的正相关,Mn与∑REE,∑Ce,∑Y呈明显的正相关,结壳中Fe,Mn与Si,Al,Cu+Co+Ni呈负相关;(3)结核(壳)中Mn/Fe与Cu/Ni,Ce/La呈负相关,Mn/Fe主要受Mn控制;(4)结核(壳)中Fe,∑REE等元素主要来自南海陆源中酸性岩类的风化、淋滤和沉积。

Based on the analysis of Fe, Mn, Cu, Co, Ni, Pb, Zn, Cr, K, Na, Ca, Mg, Si, P, Al, Ti, Sr, Ba, and SREE in 11 ferromanganese nodules (crusts) samples from the South China Sea, geochemical characteristics of ferromanganese nodules (crusts) are discussed in detail. The results show that:l) Main characteristics of elements abundance in nodules is high Fe and SREE, and low Mn, Cu, Co, Ni; 2) There is no relation between Fe and Mn,weak positive relation between Fe and SREE, SCe, SY, and obvious positive relation between Mn and SREE, SCe, SY in the ferromanganese nodules (crusts). However, there are negative relations between Fe, Mn and Si, Al, Cu + Co + Ni, and positive relations between Mn, and Sr, P, Ti in ferromanganese nodules (crusts); 3) There are negative relations between Mn/Fe and Cu/Ni, Ce/La, and Mn/Fe is mainly controlled by Mn in the ferromanganese nodules (crusts); 4) The sources of Fe, Mn and SREE in ferromanganese nodules (crusts) mainly came from slow deposition of over lying water caused by weathering and leaching of medium acidic rocks of the South China Sea.