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

التفاصيل البيبلوغرافية
العنوان: Elevated turbidity and dissolved manganese in deep water column near 10°47’S Central Indian Ridge: studies on hydrothermal activities
المؤلفون: Kiranmai Samudrala, Durbar Ray, A. Srinivas Rao, K.A. KameshRaju, L. SuryaPrakash, Dalayya Kota, V. Yatheesh, A.V. Mudholkar
المصدر: Geo-Marine Letters. 40:619-628
بيانات النشر: Springer Science and Business Media LLC, 2020.
سنة النشر: 2020
مصطلحات موضوعية: 010504 meteorology & atmospheric sciences, Geochemistry, Environmental Science (miscellaneous), 010502 geochemistry & geophysics, Geotechnical Engineering and Engineering Geology, Oceanography, 01 natural sciences, Seafloor spreading, Hydrothermal circulation, Plume, Ultramafic rock, Earth and Planetary Sciences (miscellaneous), Ridge (meteorology), Seawater, Turbidity, Rift valley, Geology, 0105 earth and related environmental sciences
الوصف: The deep water in the ridge segment between 10°18’S and 10°57’S of northern Central Indian Ridge was surveyed with CTD and AUV for seafloor hydrothermal activities. During the survey, 25 CTD hydrocasts were made, and seawater samples were collected for analyses of chemical tracers like dissolved manganese (DMn). In the rift valley between 10°40’S and 10°57’S, consistent backscatter anomalies (up to 0.013 ΔNTU) were found in deep water, indicating excess of suspended particulate at the depth between 3050 and 3500 m. The seawater samples from this turbid layer was characterized with high concentration of dissolved manganese (maximum DMn = 39 nmol/L) and excess helium-3 (maximum δ3He = 17.1%) and thus confirmed the possible hydrothermal activities in that area. The distribution of turbidity and DMn in deep water apparently suggests that there could be active vent(s) located close to the eastern wall (10°47.5’S; 66°38.6’E) of the valley, near southern end of the ridge segment. The physiochemical characters of the plume suggest the source fluid might have originated from reactions involving both mafic and ultramafic rocks, and its nature is comparable to other plumes in the Indian Ocean.
تدمد: 1432-1157
0276-0460
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::d31d0b501bad51f0bc358b7d9b2fc04c
https://doi.org/10.1007/s00367-020-00657-5
حقوق: CLOSED
رقم الأكسشن: edsair.doi...........d31d0b501bad51f0bc358b7d9b2fc04c
قاعدة البيانات: OpenAIRE