Characteristics of the multibeam backscatter of Carlsberg Ridge(60°-61°E) and its indication on the tectonism and magmatism

doi:10.3969/j.issn.1001-909X.2018.03.004

Abstract

Abstract: Multibeam sonar data can effectively reflect the features of seafloor topography and its substrates. The shipboard multibeam data were used to characterize the topography, geomorphology and the backscatter intensity characteristics of typical tectono-geographic units of the 60°-61°E segment in Carlsberg Ridge, Northwestern Indian Ocean, aiming to describe the strength of the magmatism and tectonism of the studied ridge segments. Basically, the 60°-61°E segment of Carlsberg Ridge showed symmetrical spreading with discontinuous zone. The Segment I was more influenced by tectonism, with more fractures occurred in the rift valley. The segment axis and nearby backscatter intensity reached -29 dB, with the rift wall height difference over 1 200 m. The segment also had deeper valley bottoms, higher rift valley walls, higher flank/width ratio (78.7-126.2) but less off-axial linear structures. In the rift flank, the normal fault plane was wider and the dip angle was smaller. Compared to the center of the segment, the volcanic activities in segment end had lower eruption frequency but larger eruption scale, and erupted volcanic edifices were larger in the aspect of number and volume. In contrast, the Segment II was dominated by magmatism with axial volcanic ridges and numerous symmetrically developed off-axial linear structures. The segment axis and nearby backscatter intensity reached -35 dB. The rift flank/width ratio was 77.6-116.8. The difference of the rift wall height was less than 500 m. The linear structures had relatively high aspect ratio, and were approximately symmetric on the flank of the rift. It is suggested that multibeam backscatter data combining with the topography analysis can provide quantitative evidence for the study of the strengths of the tectonism and magmatism of the mid-ocean ridge.

Key words: multibeam backscatter, Carlsberg Ridge, tectonism and magmatism, Northwestern Indian Ocean

CLC Number:

P736

YANG Chi, HAN Xi-qiu, WANG Ye-jian, LI Hong-lin, QIU Zhong-yan, WU Zhao-cai. Characteristics of the multibeam backscatter of Carlsberg Ridge(60°-61°E) and its indication on the tectonism and magmatism[J]. Journal of Marine Sciences, 2018, 36(3): 37-49.

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