naa a22 4500 510753949 CHVBK 20180411083115.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1007/s13131-013-0387-0 doi (NATIONALLICENCE)springer-10.1007/s13131-013-0387-0 Mantle melting beneath the Southwest Indian Ridge: signals from clinopyroxene in abyssal peridotites [Elektronische Daten] [Wei Wang, Fengyou Chu, Jihao Zhu, Yanhui Dong, Xing Yu, Ling Chen, Zhenggang Li] Abstracts: The mineral chemistry and texture of clinopyroxenes in peridotite from the Kingkong tectonic zone of the Southwest Indian Ridge segment in an effort to constrain mantle melting beneath this slow-spreading ridge are reported. There are three types of clinopyroxenes in the abyssal peridotites: coarse-grained, intergranular and exsolved. The compositional variations among these three types suggest that the coarse-grained clinopyroxene is a mantle-derived source. The Al, Na and Ti contents and the Na/Ti ratio of the coarsegrained clinopyroxene may be used to monitor the degree of partial melting, combined with the contradistinction with Spinel Cr#, which is calculated to be between 7.9% and 14.9%, and may represent low degrees of melting in the global ocean ridge system. The along-axis compositional variations in the coarse-grained clinopyroxene suggest that the degree of partial melting is primarily controlled by the transform faults on both sides of the ridge. Nonetheless, the northwestern side of the ridge may be affected by a hypothesised detachment fault as documented by the calculated P-T conditions. Simultaneously high Na and low Ti contents in the coarse-grained clinopyroxene points to mantle heterogeneities along the ridge axis. The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg, 2013 partial melting nationallicence abyssal peridotite nationallicence clinopyroxene nationallicence major elements nationallicence SWIR nationallicence Wang Wei The Second Institute of Oceanography, State Oceanic Administration, 310012, Hangzhou, China aut Chu Fengyou The Second Institute of Oceanography, State Oceanic Administration, 310012, Hangzhou, China aut Zhu Jihao The Second Institute of Oceanography, State Oceanic Administration, 310012, Hangzhou, China aut Dong Yanhui The Second Institute of Oceanography, State Oceanic Administration, 310012, Hangzhou, China aut Yu Xing The Second Institute of Oceanography, State Oceanic Administration, 310012, Hangzhou, China aut Chen Ling The Second Institute of Oceanography, State Oceanic Administration, 310012, Hangzhou, China aut Li Zhenggang The Second Institute of Oceanography, State Oceanic Administration, 310012, Hangzhou, China aut Acta Oceanologica Sinica Springer Berlin Heidelberg 32/12(2013-12-01), 50-59 0253-505X 32:12<50 2013 32 13131 https://doi.org/10.1007/s13131-013-0387-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s13131-013-0387-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wang Wei The Second Institute of Oceanography, State Oceanic Administration, 310012, Hangzhou, China aut NATIONALLICENCE 700 1- Chu Fengyou The Second Institute of Oceanography, State Oceanic Administration, 310012, Hangzhou, China aut NATIONALLICENCE 700 1- Zhu Jihao The Second Institute of Oceanography, State Oceanic Administration, 310012, Hangzhou, China aut NATIONALLICENCE 700 1- Dong Yanhui The Second Institute of Oceanography, State Oceanic Administration, 310012, Hangzhou, China aut NATIONALLICENCE 700 1- Yu Xing The Second Institute of Oceanography, State Oceanic Administration, 310012, Hangzhou, China aut NATIONALLICENCE 700 1- Chen Ling The Second Institute of Oceanography, State Oceanic Administration, 310012, Hangzhou, China aut NATIONALLICENCE 700 1- Li Zhenggang The Second Institute of Oceanography, State Oceanic Administration, 310012, Hangzhou, China aut NATIONALLICENCE 773 0- Acta Oceanologica Sinica Springer Berlin Heidelberg 32/12(2013-12-01), 50-59 0253-505X 32:12<50 2013 32 13131 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer