Geochemical Characterization of Exposed Black Shale Sediments of Matamuhari Anticline, Bangladesh
Ashraf Ali Seddique,
Nazmul Islam,
Shree Bipulendu Basak,
Muhammad Badruzzaman,
Abdul Batin
Issue:
Volume 7, Issue 3, May 2019
Pages:
86-92
Received:
31 May 2019
Accepted:
3 July 2019
Published:
19 July 2019
Abstract: Matamuhari anticline is one of the largest anticline situated at Bandarban district of Bangladesh which is 60 km long and 20 km wide in the part of Bangladesh. Like other part of Bangladesh the whole sequence of exposed rocks of Matamuhari anticline is composed with Neogene sedimentary rocks of shale, sandstone, siltstone, silty shale, tabular and spheroidal calcareous concretions. Seven outcrop black shale samples were collected during February 2013 from the different parts of the anticline namely Boro Bari Jhiri, Ochir Jhiri and Tak Chara area were mineralogically and geochemically examined in order to better understand the depositional environment in the studied area. The major and trace elements were analyzed using XRF spectrometry. Two distinct lithofacies assemblages, mud and silty-clay are found in the collected sediments. The shales are predominated by quartz, kaolinite, chlorite, mica (muscovite and biotite), feldspar (both K-feldspar and plagioclase), and in addition to a variable ratio of vermiculite. Lithologial characteristics and geochemical data demonstrated that sediments are enriched with TOC contents ranging from 0.39 to 0.67 wt.% and shows distinctive correlation to concentration of TOC and particle size distribution. These shales are characterized by a low Mg and K as well as high Al and Fe contents. Studies also show that the values of MgO/Al2O3 and K2O/Al2O3 ratio ranges from 0.15 to 0.17 and 0.18 to 0.20 respectively. The relationship of log MgO/Al2O3 and log K2O/Al2O3 values reveals that all of the studied samples fell within the marine environment. Ni/Co ratio of the studied shale samples ranges from 2.84 to 3.88 (average 3.36). These low values of Ni/Co ratio suggest that the sediments were deposited under oxic conditions. However, the above observations suggest that the sediments of Matamuhari anticline area were deposited in a shallow marine environment under oxic conditions.
Abstract: Matamuhari anticline is one of the largest anticline situated at Bandarban district of Bangladesh which is 60 km long and 20 km wide in the part of Bangladesh. Like other part of Bangladesh the whole sequence of exposed rocks of Matamuhari anticline is composed with Neogene sedimentary rocks of shale, sandstone, siltstone, silty shale, tabular and ...
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Applications of Cluster Analysis Method in Surface Water Quality Assessment: A Case Study in Balihe Lake, China
Jiazhu Lan,
Meifang Zhong,
Yixin Xu,
Zhongyu Wang,
Hai Huang
Issue:
Volume 7, Issue 3, May 2019
Pages:
93-98
Received:
13 July 2019
Accepted:
6 August 2019
Published:
19 August 2019
Abstract: Analyses on the spatial evolution and distribution of surface water quality are important to the treatment and protection of water environment in a lake. In Balihe Lake, an inland freshwater lake in east China, 7 water environmental factors at 45 sampling sites were monitored and served as the basis of this study. Cluster analysis (CA), a multivariate statistical analysis method, was utilized to study the spatial variation and grouping of these sampling sites based on the monitored water quality data. The results of this study showed that the water quality characteristics at these 45 sampling sites, which was grouped into the clusters of upstream, midstream and downstream, highly depended on the spatial location of the lake. Some nutrients content of the upstream area was much higher, while the water quality of the downstream area was much better although some of water quality indicators at the outlet still didn’t match the standards of local government. The CA results of the study may provide some guidance to the priority areas of water environment protection or treatment for the government.
Abstract: Analyses on the spatial evolution and distribution of surface water quality are important to the treatment and protection of water environment in a lake. In Balihe Lake, an inland freshwater lake in east China, 7 water environmental factors at 45 sampling sites were monitored and served as the basis of this study. Cluster analysis (CA), a multivari...
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