Iyer, Sridhar D (2005): Evidences for incipient hydrothermal event(s) in the Central Indian Basin; a review

Leg/Site/Hole:
ODP 116
ODP 116 717
ODP 116 718
ODP 116 719
Identifier:
2008-131641
georefid

Creator:
Iyer, Sridhar D
National Institute of Oceanography, Dona Paula, India
author

Identification:
Evidences for incipient hydrothermal event(s) in the Central Indian Basin; a review
2005
Acta Geologica Sinica (English Edition)
Geological Society of China, Beijing, China
79
1
77-86
The Central Indian Basin (CIB, 10-19 S) encompasses morphotectonic features such as seamounts, abyssal hills, faults, fracture zones and lineations, as well as 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 -10 ka and 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 S/81 E) hydrothermal precipitates of inorganic calcite and deposition of sulphide minerals (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.
English
Serial
Coverage:Geographic coordinates:
North:-0.5547
West:81.2324East: 81.2404
South:-1.0116

Oceanography; alkali basalts; basalts; Cenozoic; Central Indian Basin; ferromanganese crusts; glasses; hydrothermal conditions; igneous rocks; Indian Ocean; intraplate processes; Leg 116; metasomatism; Miocene; Neogene; Ocean Drilling Program; ODP Site 717; ODP Site 718; ODP Site 719; palagonitization; Quaternary; spilite; Tertiary; volcanic glass; volcanic rocks;

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