Two possible hydrothermal vents in the northern Okinawa Trough

来源 :Chinese Science Bulletin | 被引量 : 0次 | 上传用户:g123s123
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
As the Okinawa Trough is a back-arc basin in early spreading, modern submarine hydrothermal activity and minerallization have many characteristics which have aroused wide attention. Up to now, three well-known hydro-thermal venting areas are all located in the middle part of the trough. During two cruise investigations to map and sample the seafloor, numbers of Calyptogena sp. shells were dredged at two sites in the northern trough with comparatively thicker crust and numerous submarine volcanoes. Based on the fact that Calyptogena sp. is only observed around the hydrothermal vents and lives on hydrothermal activities, it is predicted that there is the possibility of modern hydrothermal activities in the northern part of the trough. In this note, the shell is carefully characterized and the sample locations with possible hydrothermal activity are given. It is pointed out that the research of biogenic fossils to trace hydrothermal activity changes in venting time, strength fluctuations, evolution in chemi As the Okinawa Trough is a back-arc basin in early spreading, modern submarine hydrothermal activity and minerallization have many many features which have aroused wide attention. Up to now, three well-known hydro-thermal venting areas are all located in the middle part of The two passages in the northern trough with comparatively thicker crust and numerous submarine volcanoes. Based on the fact that Calyptogena sp. is only observed around around the hydrothermal vents and lives on hydrothermal activities, it is predicted that there is the possibility of modern hydrothermal activities in the northern part of the trough. In this note, the shell is carefully characterized and the sample locations with possible hydrothermal activity are given. It is pointed out that the research of biogenic fossils to trace hydrothermal activity changes in venting time, strength fluctuations, evolution in chemi
其他文献
为积极做好三峡工程的前期准备工作,水电部于1984年7月在杭州召开了《三峡大型专用施工机械设备》可行性研究报告审定会。参加会议的有机械部、城建部、中船公司、水电部有
Compared to North American shale composition (NASC), REE contents of sediments from the CC area in the Pacific Ocean are obviously high except that cerium has e
探讨了大豆异黄酮胶囊中微量铅的测定方法 ,大豆异黄酮胶囊为新开发的一种保健药品 ,为保证消费者的用药安全 ,需快速、准确的检测出重金属铅的含量。采用石墨炉原子吸收法测
1 病例报告例 1:女 ,3岁。 1个月来大量食蜜桔 ,每日 5~ 6个 ,约 0 .5kg,共食 15kg以上 ,发生食欲减退 ,手掌、足底、前额及鼻翼皮肤黄染。患儿平素健康 ,无肝炎接触史及可疑
在当前共享存储对称多处理 ( SMP)并行机上 ,基于指导语句的并行程序设计模式 ,讨论了多功能油藏数值模拟软件中求解超过百万节点规模的解法器 ( MFS)的并行和优化技术。首先
21世纪我国将进入天然气生产、运输发展的黄金时期 ,我国航运业应抓住机遇 ,发展国有LNG船队 ,实现LNG进口的自主运输。为国家节省外汇 ,向航运强国发展。 In the 21st cent
本文以《名侦探柯南》为研究对象,首先对《名侦探柯南》这部动漫做了介绍,其次从宏观和微观两个层面对于日本动漫经典的成功之路进行了探讨。 This article takes “Detecti
电视剧《白鹿原》近日已播出过半,相比于开播前的声势和剧集的投入,电视剧版《白鹿原》在收视和传播上都远远称不上令人满意。这部立项16年,历经周折,耗资3亿的85集巨制画面大气、演技精湛、细节考究,毫无疑问是一部“良心剧”。只是,相对于文学作品《白鹿原》而言,电视剧版也许注定要少了光芒四射的魅力。  一幅黄土飞扬的八百里秦川画卷  “吃饱了,喝胀了,和皇上他爸一样了……”一段秦腔似的吼声,拉开了电视剧
本文通过调查问卷的方法,以来华长期进修留学生为调查对象,对其学习动机从水平、地区、性别三个维度进行了实证研究。主要结论如下:留学生的学习动机呈现多维取向的综合模式,
一.当今电视技术与我国电视事业发展之回顾应美国草谷公司(GVG)和香港安恒利国际有限公司(ACE)的邀请,我有幸于今年4月中旬赴美,参加一年一度在世界闻名的赌城——内华达州