Composition and parageneses of massive pyrolusite from the deep-water basin of the Sea of Japan

被引：3
作者：
Astakhova, N. V. [1 ]
Lopatnikov, E. A. [1 ]
机构：
[1] VI Ilichev Pacific Oceanol Inst, Ul Baltiiskaya 43, Vladivostok 690041, Russia
来源：
RUSSIAN GEOLOGY AND GEOPHYSICS | 2016年 / 57卷 / 10期
关键词：
ferromanganese crusts; pyrolusite; birnessite; todorokite; Sea of Japan; FERROMANGANESE DEPOSITS; RIDGE;
D O I：
10.1016/j.rgg.2016.09.003
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
Hard fragments (crushed only by a hammer) of manganese deposits differing strongly in appearance from the regional ferromanganese crusts were sampled from depths of 3500-3200 m during the dredging of an unnamed seamount in the Central Basin of the Sea of Japan. Their surface has a black carbonaceous coating; after its removal, the crusts become steel-gray. The specific weight of these crust fragments is 3.35 g/cm(3), whereas the regional crusts have a specific weight of < 2 g/cm(3). X-ray diffraction analysis showed that the sampled fragments consist of pure pyrolusite. There are also fragments of crusts formed by todorokite and birnessite. All pyrolusite samples have an abnormally high content of Mn (up to 63%). The Mn/Fe ratio reaches 9016. The conclusion is drawn that the manganese crusts formed on this seamount are of hydrothermal genesis. (C) 2016, V.S. Sobolev IGM, Siberian Branch of the RAS. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码：1465 / 1476
页数：12
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