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Evidences for incipient hydrothermal event(s) in the Central Indian Basin: A review

DRS at CSIR-National Institute of Oceanography

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Title Evidences for incipient hydrothermal event(s) in the Central Indian Basin: A review
 
Creator Iyer, S.D.
 
Subject hydrothermal activity
tectonics
volcanoes
seamounts
abyssal hills
fracture zone
faults
zeolites
 
Description The Central Indian Basin (CIB, 10 degrees-19 degrees S) encompasses morphotectonic features such as seamounts, abyssal hills, faults, fracture zones and lineations and basic to silicic volcanics that were derived from different sources. Instances of incipient hydrothermal event (s) occurred as evident from: (1) spilites that probably formed due to low-temperature hydrothermal action on the precursory basalts, (2) slabs and fragments of zeolitites which are the consequent products of palagonitization of the basaltic glasses, (3) chemical variations in the ferromanganese crusts, and (4) abundance of volcanogenic-hydrothermal material (vhm) that includes ochrous sediments and magnetite spherules. The vhm suggests its origin by interaction of Fe-rich hydrothermal solutions with surrounding sediments. The CIB spherules occur in sediments of approx. 10 ka and approx. 425 to 650 ka age and are orders of magnitude younger than the 50 to 60 Ma age of the basin. Incidentally, to the north of the basin at ODP Site 717-719 (1 degree S/81 degrees E) hydrothermal precipitates of inorganic calcite and eposition of sulphide minerals (approx. 7.5 to 9 Ma and 0.5 Ma) occur as a result of the on-going intraplate deformation. This paper reviews the above evidences that possibly indicate episodes of localized hydrothermal events in the CIB.
 
Date 2008-02-22T05:27:02Z
2008-02-22T05:27:02Z
2005
 
Type Journal Article
 
Identifier Acta geologica Sinica, Vol.79; 77-86p.
http://drs.nio.org/drs/handle/2264/924
 
Language en
 
Rights Copyright [2005]. It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice by copyright holder that the rights are voilated then the item would be withdrawn.
 
Publisher The Geological Society of China