中太平洋海山区富钴结壳的钙质超微化石地层学研究

苏新; 马维林; 程振波

中太平洋海山区富钴结壳的钙质超微化石地层学研究

1.
中国地质大学岩石圈构造与深部过程及探测技术重点实验室, 北京 100083
2.
国家海洋局第二海洋研究所, 国家海洋局海底科学重点实验室, 浙江杭州 310012
3.
国家海洋局第一海洋研究所, 山东青岛 266071

基金项目:

中国大洋矿产资源开发协会“九五”专项 DY95-08-06

“十五”项目 DY105-01-04-08

详细信息

作者简介:
苏新(1957-), 女, 教授, 主要从事海洋地质和钙质超微化石研究.E-mail: xsu@cugb.edu.cn

中图分类号: P736.21
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出版历程
- 收稿日期: 2004-01-13
- 刊出日期: 2004-03-25

Calcareous Nannofossil Biostratigraphy for Co-Rich Ferromanganese Crusts from Central Pacific Seamounts

1.
Key Laboratory ofLithospheric Tectonics Deep-Level Process, China University ofGeosciences, Beijing 100083, China
2.
The Second Institute ofOceanography and Key Laboratory ofSeafloor Science, National Oceanography Bureau, Hangzhou 310012, China
3.
The First Institute ofOceanography, National Oceanography Bureau, Qingdao 266071, China

摘要

摘要: 对“大洋一号”调查船在中太平洋采集的N1-15和N5E-06 2个富钴结壳样品进行了钙质超微化石及其生物地层学的研究与分析.这2个结壳从结构上分为3层: 致密型上层、疏松型中层和致密型下层.在研究中对各结构层和各层中有颜色或细微结构变化的层位都进行了详细的取样和分析.在识别了12个新生代钙质超微化石事件的基础上, 确定了2个结壳致密型上层结壳都为晚更新世以来的沉积, 它们的疏松型中层结壳为上新世到中更新世的沉积.对N5E-06富钴结壳来说, 其致密型下层结壳下部形成于中晚古新世到早渐新世的59.7~ 32.8 Ma期间.N1-15富钴结壳致密型下层的形成时代目前暂时定为中新世.研究注意到在2个结壳中都没有发现可信的晚渐新世到中新世的化石记录, 在个别层位之间存在着沉积间断.
- 富钴结壳 /
- 钙质超微化石 /
- 生物地层学研究 /
- 中太平洋海山区
Abstract: Calcareous nannofossils in 2 Co-rich ferromanganese crusts, N1-15 and N5E-06, from the central Pacific seamounts were analyzed in order to estimate their depositional ages. These 2 crusts show 3 structural layers: compact upper layer, porous middle layer and compact lower layer. 12 Tertiary to Quaternary nannofossil eventswere recognized. The upper layers of these 2 crustswere deposited since Late Pleistocene, while their middle layers were formed from Pliocene to Middle Pleistocene. The age of the lowest sample from N5E-06 crustwas estimated as 55.3-59.7 Ma in the Middle to Late Paleocene, and the duration for lower part of the lower layer was given between 59.7-32.8 Ma from the Middle Paleocene and Early Oligocene.For the lower layerof N1-15 crust, the age was roughly determined to be Miocene, due to the lack of reliable fossils. This study notes that no reliable Late Oligocene to Miocene nannofossil markers were found in these 2 crusts. Furthermore, sedimentation hiatus was observed.
- Co-rich ferromanganese crust /
- calcareous nannofossil /
- biostratigraphy research /
- central Pacific seamount

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图 1 N1-15富钴结壳照片

Fig. 1. Photography of Co-rich ferromanganese crust N1-15

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图 2 N1-15富钴结壳结构分层和取样分层

Ⅰ—Ⅴ层顶、底.各层顶底位置; ▼或▲.取样位置; ▲1.样品编号

Fig. 2. Generalized subdivision and sampling record of Co-rich ferromanganese crust N1-15

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图 3 N5E-06富钴结壳照片

Fig. 3. Photography of Co rich ferromanganese crust N5E-06

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图 4 N5E-06富钴结壳结构分层和取样分层

Ⅰ—Ⅴ层顶、底.各层顶底位置; ▼或▲.取样位置; ▲1, 样品编号

Fig. 4. Generalized subdivision and sampling record of Corich ferromanganese crust N5E-06

下载: 全尺寸图片幻灯片

表 1 富钴结壳样品的结构特征

Table 1. Structural features of Co-rich ferromanganese crusts

表 2 本文引用的新生代钙质超微化石事件及其时代

Table 2. Tertiary calcarous nannofossil events and ages used in this study

表 3 N1-15结壳Ⅳ层的晚更新世化石与较老年代化石的混杂情况

Table 3. Mixture of few Late Pleistocene with trace Oligocene to Miocene calcarous nannofossil events and ages from Ⅳ layer in N1-15

表 4 N1-15结壳各层年代标志化石记录及其地质时代和年龄的估计

Table 4. Calcareous nannofossil events found from each layer of Co-rich ferromanganese crust N1-15 and geological ages estimated for these layers

表 5 N5E-06富钴结壳各层年代标志化石与地质时代和年龄的估计

Table 5. Calcareous nannofossil events found from each layer of Co-rich ferromanganese crust N5E-06 and geological ages estimated for these layers

参考文献(12)

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