Elevated turbidity and dissolved manganese in deep water column near 10°47’S Central Indian Ridge: studies on hydrothermal activities

2020 ◽  
Vol 40 (5) ◽  
pp. 619-628 ◽  
Author(s):  
Durbar Ray ◽  
K. A. KameshRaju ◽  
A. Srinivas Rao ◽  
L. SuryaPrakash ◽  
Abhay V. Mudholkar ◽  
...  
Keyword(s):  
Water Column ◽  
Deep Water ◽  
Central Indian Ridge ◽  
Indian Ridge ◽  
Hydrothermal Activities

Copepoda (Siphonostomatoida: Dirivultidae) from Hydrothermal Vent Fields on the Central Indian Ridge, Indian Ocean

Zootaxa ◽  
2020 ◽  
Vol 4759 (3) ◽  
pp. 301-337 ◽  
Author(s):  
JIMIN LEE ◽  
DONGSUNG KIM ◽  
IL-HOI KIM
Keyword(s):  
Indian Ocean ◽  
Deep Water ◽  
Hydrothermal Vent ◽  
First Record ◽  
The Other ◽  
Central Indian Ridge ◽  
East Pacific ◽  
The Family ◽  
The Indian Ocean ◽  
Indian Ridge

Eight species of copepods belonging to the family Dirivultidae (Siphonostomatoida) are described from deep-water hydrothermal vent fields on the Central Indian Ridge in the Indian Ocean. Aphotopontius limatulus Humes, 1987, previously known only from the East Pacific, is included. The other seven species are new, as follows: Aphotopontius kiost n. sp., A. muricatus n. sp., Benthoxynus constrictus n. sp., Stygiopontius spinifer n. sp., S. horridus n. sp., S. geminus n. sp., and S. quadripaxillifer n. sp. The copepodid I stage of S. horridus n. sp. is also described. This is the first record on copepods living on hydrothermal vent fields in the Indian Ocean. 

Segmentation of the Central Indian Ridge between 12°12′ S and the Indian Ocean Triple Junction

1993 ◽  
Vol 15 (4) ◽  
pp. 265-282 ◽  
Author(s):  
Lindsay M. Parson ◽  
Philippe Patriat ◽  
Roger C. Searle ◽  
Anne R. Briais
Keyword(s):  
Indian Ocean ◽  
Triple Junction ◽  
Central Indian Ridge ◽  
The Indian Ocean ◽  
Indian Ridge

scholarly journals The response of water column and sedimentary environments to the advent of the Messinian salinity crisis: insights from an onshore deep-water section (Govone, NW Italy)

2020 ◽  
pp. 1-17
Author(s):  
Mathia Sabino ◽  
Francesco Dela Pierre ◽  
Marcello Natalicchio ◽  
Daniel Birgel ◽  
Susanne Gier ◽  
...  
Keyword(s):  
Water Column ◽  
Deep Water ◽  
Bottom Layer ◽  
Messinian Salinity Crisis ◽  
Sedimentary Environments ◽  
Water Column Stratification ◽  
Stratigraphic Architecture ◽  
Spatial Changes ◽  
Oxygen Stable Isotope ◽  
Nw Italy

Abstract During Messinian time, the Mediterranean underwent hydrological modifications culminating 5.97 Ma ago with the Messinian salinity crisis (MSC). Evaporite deposition and alleged annihilation of most marine eukaryotes were taken as evidence of the establishment of basin-wide hypersalinity followed by desiccation. However, the palaeoenvironmental conditions during the MSC are still a matter of debate, chiefly because most of its sedimentary record is buried below the abyssal plains of the present-day Mediterranean Sea. To shed light on environmental change at the advent and during the early phase of the MSC, we investigated the Govone section from the Piedmont Basin (NW Italy) using a multidisciplinary approach (organic geochemical, petrographic, and carbon and oxygen stable isotope analyses). The Govone section archives the onset of the crisis in a succession of organic-rich shales and dolomite-rich marls. The MSC part of the succession represents the deep-water equivalent of sulphate evaporites deposited at the basin margins during the first phase of the crisis. Our study reveals that the onset of the MSC was marked by the intensification of water-column stratification, rather than the establishment of widespread hypersaline conditions. A chemocline divided the water column into an oxygen-depleted, denser and more saline bottom layer and an oxygenated, upper seawater layer influenced by freshwater inflow. Vertical oscillations of the chemocline controlled the stratigraphic architecture of the sediments pertaining to the first stage of the MSC. Accordingly, temporal and spatial changes of water masses with different redox chemistries must be considered when interpreting the MSC event.

Mercury proxy for hydrothermal and submarine volcanic activities in the sediment cores of Central Indian Ridge

2020 ◽  
Vol 159 ◽  
pp. 111513
Author(s):  
Dhongil Lim ◽  
Haryun Kim ◽  
Jihun Kim ◽  
Dohyun Jeong ◽  
Dongsung Kim
Keyword(s):  
Sediment Cores ◽  
Central Indian Ridge ◽  
Indian Ridge ◽  
Volcanic Activities
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