Geochemical behavior of elements at fossil sea floor water/sediment interface

作     者：ZHANG Haihua~1, XIA Yu~1, WANG Zuwei~2 and ZHOU Yongzhang~3 1. Guangzhou Institute of Geochemistry, Chinese Academy of Science, Guangzhou 510640, China 2. Department of Geography, Tianjin Normal University, Tianjin 300071, China 3. Department of Earth Sciences, Zhongshan University, Guangzhou 510275, China 

作者机构：Guangzhou Institute of Geochemistry Chinese Academy of Science Guangzhou 510640 China Department of Geography Tianjin Normal University Tianjin 300071 China Department of Earth Sciences Zhongshan University Guangzhou 510275 China 

出 版 物：《Chinese Science Bulletin》 (科学通报(英文版))

年 卷 期：1999年第44卷第S2期

页      面：232-233页

学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学] 

主　　题：water/sediment interface sedimentation periodicity sedimentary geochemistry basin. 

摘      要：THIS note deals with the geochemical behavior of elements near the water/sediment interface of a fossil seafloor. The Nandan-Hechi basin, located in northwest Guangxi, Southern China, is selected for exemplified study. It is an elongated basin, and developed on a Caledonian basement. Its Devonian strata hosthydrtothermally sedimentary formations, and are typical of the intra-platformal basin facies sediments oversouthern China. A steady sedimentary sequence may be observed, commonly going from carboniferouspelite at bottom, upward through bedded chert, thickly banded argillaceous limestone, thinly bandedsiliceous limestone and small lensiod argillaceous limestone in the middle, to coarse lensoid siliceousand/or argillaceous limestone at the top. The chert and some argillaceous limestone are related to hydrothermally sedimentary origin. The present study focuses on the lensoid argillaceous limestone formation. This formation contains the following characteristic sedimentary structures: small lensoid structure,vermiform structure, wave-shaped banded structure, massive structure, white framboid structure, andcage netting structure.