Record Details

Holocene phosphorites of the western continental margin of India

DRS at CSIR-National Institute of Oceanography

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Field Value
 
Title Holocene phosphorites of the western continental margin of India
 
Creator Nair, R.R.
 
Subject Aquatic Non-Resources
radiocarbon dating
minerals
continental shelves
continental margins
phosphorite
holocene
ISW, India
 
Description Seventeen samples collected during different cruises of RV Gaveshani, were analysed by X-Ray diffractometer for apatite. These samples consists of algal and oolitic limestones and were recovered from depths ranging from 70 to 150 m on the western continental shelf from Saurashtra to Kerala. Prominent apatite peak was present only in the algal limestones off Goa. These occur as nodules and are similar in appearence to rhodoliths. Minerals present, in order of abundance, are high-magnesium calcite, francolite (carbonate flourapatite), quartz, feldspar and aragonite. P2 O5 concentration varies between 0.8% and 10.8% indicating a wide variation in chemical composition with the area. Age determined by the radiocarbon method is 11,040 years. It appears that these phosphorites were formed by diagenesis and the enrichment of phosphate in these limestones might be related to the physico-chemical activity of microorganism that built the algal mat
 
Date 1995-05-20T10:01:09Z
2017-09-29T13:48:25Z
1995-05-20T10:01:09Z
2017-09-29T13:48:25Z
1985
 
Type Journal Article
 
Identifier Mahasagar, vol.18; 1985; 273-279
0542-0938
http://drs.nio.org/drs/handle/2264/6329
 
Language en
 
Relation Mahasagar
NON-SCI
 
Publisher Indian Association for Limnology and Oceanography