The tectonic geomorphology and magmatic-tectonic activity in the 61°24'E-61°48'E segment of the Carlsberg Ridge in the Northwest Indian Ocean

doi:10.3969/j.issn.1001-909X.2024.04.007

Abstract

Abstract:

The topographic and geomorphologic features of mid-ocean ridges are directly controlled by tectonic movements and magmatic activities, and study of them can help us to understand the tectonic evolution history and magmatic processes of mid-ocean ridges, and is also of great significance to the exploration of deep-sea mineral resources. In this paper, the shipboard multibeam sonar data collected during the China Ocean 24 Cruise were utilize to study the topographic and geomorphologic features of the Carlsberg Ridge in the Northwest Indian Ocean by applying the quantitative analysis method with the 61°24'E-61°48'E segment as the research target, the magma intrusion ratio and the fault correlation index were calculated, and the magma-tectonic significance of the study area was discussed. The study area can be divided into four secondary mid-ocean ridge segments (A, B, C, and D). The active intervals of magma-tectonic periods for segments A, B, C, and D are 0.15, 0.50, 0.70 and 0.21 Ma, respectively. The mid-ocean ridge segments A and B are asymmetric dilatation sections with poor magma and mainly tectonic action, belonging to the period of tectonic activity; the mid-ocean ridge segment C is a symmetric dilatation section with sufficient magma and mainly magmatic action, belonging to the period of axial volcanic ridge construction; the mid-ocean ridge segment D is a symmetric dilatation section with poor magma and mainly tectonic action, belonging to the period of tectonic activity. Faults area with high kernel density on the two flanks of the mid-ocean ridge section has a possibility of forming an area of hydrothermal activity, which is a target area of further exploration.

Key words: Carlsberg Ridge, topography and geomorphology, magma cycles, quantitative analysis, magmatic-tectonic activity, magma intrusion ratio, asymmetric expansion, kernel density

CLC Number:

P736.1

YE Shengyuan, HAN Xiqiu, LI Honglin. The tectonic geomorphology and magmatic-tectonic activity in the 61°24'E-61°48'E segment of the Carlsberg Ridge in the Northwest Indian Ocean[J]. Journal of Marine Sciences, 2024, 42(4): 70-82.

Figures/Tables 16

Fig.1 Topographic map of the study area (The bathymetric data are sourced from the DY24 Cruise. The projection method is Gauss-Kruger. The grid resolution is 50 m. The small globe map in the upper right corner is the distribution map of Indian Ocean ridges, the red line in the map is the mid-ocean ridge line, the yellow line is the plate boundary, and the red five-pointed star is the location of the study area.)

Fig.2 Diagram of measurement parameters for the profile of the mid-ocean ridge

Fig.3 Schematic diagram of M value calculation

Fig.4 Location of cross-sections

Fig.5 Typical cross-sections of four mid-ocean ridge segments (The black dotted lines in the figure are the faults.)

Tab.2 Morphology and some important structural feature data of mid-ocean ridge segments A, B, C and D

名称	脊段长度 /km	轴部裂谷宽度/km	最大水深/m	轴部裂谷高度/m	AVR 高度/m	轴部裂谷高宽比/ (×10^-3)
洋中脊A段	14.0		4 075
剖面1		13.6	4 068	900	130	66.2
剖面2		10.3	3 952	801	163	77.8
剖面3		9.5	3 460	683	280	71.9
剖面4		8.9	3 901	860	112	96.6
洋中脊B段	40.0		4 175
剖面5		9.5	4 087	884	405	93.1
剖面6		9.1	4 148	1 313	685	144.3
剖面7		10.4	3 980	1 467	667	141.1
剖面8		9.5	3 556	1 012	528	106.5
剖面9		10.2	3 548	1 004	322	98.4
剖面10		9.8	3 700	1 102	500	112.4
剖面11		9.7	3 972	1 148	580	118.4
剖面12		9.8	3 957	1 617	451	165.0
剖面13		9.4	4 016	1 673	251	178.0
剖面14		8.9	3 947	1 340	220	150.6
洋中脊C段	21.0		4 370
剖面17		16.9	4 343	1 013	306	59.9
剖面18		15.5	4 125	1 092	461	70.5
剖面19		13.8	4 141	1 197	603	86.7
剖面20		14.6	4 087	957	660	65.5
剖面21		13.7	4 028	697	832	50.9
洋中脊D段	17.5		3 920
剖面22		20.9	3 845	1 429	275	68.4
剖面23		20.5	3 782	996	391	48.6
剖面24		15.4	3 648	953	202	61.9
剖面25		14.8	3712	643	258	43.4

Fig.6 Informational diagram of mid-ocean ridge axial structure

Fig.7 Fault structure map of the study area

Fig.8 Fault length, quantity (a) and average azimuth statistical map (b) in the study area

Fig.9 Fault kernel density map of the study area

Fig.10 Volcanic kernel density map of the study area

Fig.11 The magma cycle of the mid-ocean ridge segment A

Fig.12 The magma cycle of the mid-ocean ridge segment B

Fig.13 The magma cycle of the mid-ocean ridge segment C

Fig.14 The magma cycle of the mid-ocean ridge segment D

Fig.15 The magmatic tectonic stage of the axial rift of the four mid-ocean ridge segments in the study area

References 29

[1]	MURTON B J, BAKER E T, SANDS C M, et al. Detection of an unusually large hydrothermal event plume above the slow-spreading Carlsberg Ridge: NW Indian Ocean[J]. Geophysical Research Letters, 2006, 33(10): L10608.
[2]	HARRIS P T, MACMILLAN-LAWLER M, RUPP J, et al. Geomorphology of the oceans[J]. Marine Geology, 2014, 352: 4-24.
[3]	MENDEL V, SAUTER D, ROMMEVAUX-JESTIN C, et al. Magmato-tectonic cyclicity at the ultra-slow spreading Southwest Indian Ridge: Evidence from variations of axial volcanic ridge morphology and abyssal hills pattern[J]. Geochemistry, Geophysics, Geosystems, 2003, 4(5): 9102.
[4]	YEO I, SEARLE R C, ACHENBACH K L, et al. Eruptive hummocks: Building blocks of the upper ocean crust[J]. Geology, 2012, 40(1): 91-94.
[5]	KAMESH RAJU K A, CHAUBEY A K, AMARNATH D, et al. Morphotectonics of the Carlsberg Ridge between 62°20' and 66°20'E, northwest Indian Ocean[J]. Marine Geology, 2008, 252(3/4): 120-128.
[6]	HARRIS P T, WHITEWAY T. High seas marine protected areas: Benthic environmental conservation priorities from a GIS analysis of global ocean biophysical data[J]. Ocean & Coastal Management, 2009, 52(1): 22-38.
[7]	TUCHOLKE B E, LIN J. A geological model for the structure of ridge segments in slow spreading ocean crust[J]. Journal of Geophysical Research: Solid Earth, 1994, 99(B6): 11937-11958.
[8]	韩喜球, 吴招才, 裘碧波. 西北印度洋 Carlsberg脊的分段性及其构造地貌特征——中国大洋24航次调查成果介绍[R]// 深海研究与地球系统科学学术研讨会, 2012.
	HAN X Q, WU Z C, QIU B B. The segmentation of the Carlsberg Ridge in the Northwest Indian Ocean and its tectonic and geomorphologic characteristics—Introduction to China Oceans 24 Cruise Survey results[R]// Deep sea research and earth system science conference, 2012.
[9]	杨驰, 韩喜球, 王叶剑, 等. 卡尔斯伯格脊60°—61°E洋脊段多波束后向散射特征及其对构造与岩浆作用强度的指示[J]. 海洋学研究, 2018, 36(3):37-49. DOI
	YANG C, HAN X Q, WANG Y J, et al. 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. DOI
[10]	余星, 韩喜球, 邱中炎, 等. 西北印度洋脊的厘定及其地质构造特征[J]. 地球科学, 2019, 44(2):626-639.
	YU X, HAN X Q, QIU Z Y, et al. Definition of northwest Indian ridge and its geologic and tectonic signatures[J]. Earth Science, 2019, 44(2): 626-639.
[11]	WANG Y J, HAN X Q, ZHOU Y D, et al. The Daxi Vent Field: An active mafic-hosted hydrothermal system at a non-transform offset on the slow-spreading Carlsberg Ridge, 6°48’N[J]. Ore Geology Reviews, 2021, 129: 103888.
[12]	李洪林, 李江海, 王洪浩, 等. 海洋核杂岩形成机制及其热液硫化物成矿意义[J]. 海洋地质与第四纪地质, 2014, 34(2):53-59.
	LI H L, LI J H, WANG H H, et al. Formation mechanism of oceanic core complex and its significance to the mineralization of hydrothermal sulfide[J]. Marine Geology & Quaternary Geology, 2014, 34(2): 53-59.
[13]	余星, 初凤友, 董彦辉, 等. 拆离断层与大洋核杂岩:一种新的海底扩张模式[J]. 地球科学, 2013, 38(5):995-1004.
	YU X, CHU F Y, DONG Y H, et al. Detachment fault and oceanic core complex: A new mode of seafloor spreading[J]. Earth Science, 2013, 38(5): 995-1004.
[14]	杨驰. 卡尔斯伯格脊 60°E-61°E洋脊段地形地貌特征——基于多波束资料的分析[D]. 杭州: 自然资源部第二海洋研究所, 2018.
	YANG C. Topographic and geomorphologic characteristics of the 60°E-61°E ridge section of the Carlsberg Ridge—an analysis based on multibeam data[D]. Hangzhou: Second Institute of Oceanography, MNR, 2018.
[15]	KRIGE D G. A statistical approach to some basic mine valuation problems on the Witwatersrand[J]. Journal of the Chemical Metallurgical & Mining Society of South Africa, 1951, 52(6): 119-139.
[16]	MATHERON G. Principles of geostatistics[J]. Economic Geology, 1963, 58(8): 1246-1266.
[17]	WESSEL P, SMITH W H F, SCHARROO R, et al. Generic mapping tools: Improved version released[J]. Eos, Tran-sactions American Geophysical Union, 2013, 94(45): 409-410.
[18]	HOWELL S M, ITO G, BEHN M D, et al. Magmatic and tectonic extension at the Chile Ridge: Evidence for mantle controls on ridge segmentation[J]. Geochemistry, Geophysics, Geosystems, 2016, 17(6): 2354-2373.
[19]	ANDERSON M O, CHADWICK JR W W, HANNINGTON M D, et al. Geological interpretation of volcanism and seg-mentation of the Mariana back-arc spreading center between 12.7°N and 18.3°N[J]. Geochemistry, Geophysics, Geosystems, 2017, 18: 2240-2274.
[20]	O’CALLAGHAN J F, MARK D M. The extraction of drainage networks from digital elevation data[J]. Computer Vision, Graphics, and Image Processing, 1984, 28(3): 323-344.
[21]	XU Y C, CHEN N H, TAO C H, et al. Magmato-tectonic mechanism of Southwest Indian Ridge (49°-50°E) inferred from quantitative morphotectonic analysis based on high-resolution multibeam bathymetry[J]. Marine Geology, 2021, 434: 106421.
[22]	党牛, 余星, 韩喜球, 等. 基于海底DEM的洋中脊火山锥自动识别方法研究[J]. 海洋学研究, 2021, 39(3):12-20.
	DANG N, YU X, HAN X Q, et al. Automatic recognition of volcanic cones at mid-ocean ridges based on the seabed DEM data[J]. Journal of Marine Sciences, 2021, 39(3): 12-20. DOI
[23]	陈强. 高级计量经济学及Stata应用[M]. 北京: 高等教育出版社, 2010.
	CHEN Q. Advanced econometrics and Stata application[M]. Beijing: Higher Education Press, 2010.
[24]	SILVERMAN B W. Density estimation for statistics and data analysis[M]. London: Chapman and Hall, 1986.
[25]	刘守金, 林间, 罗怡鸣. 东南印度洋中脊(108°—134°E区域)断层构造与岩浆活动关系[J]. 热带海洋学报, 2019, 38(4):70-80. DOI
	LIU S J, LIN J, LUO Y M. Variations in tectonic faulting and magmatism at the southeast Indian ridge at 108°-134°E[J]. Journal of Tropical Oceanography, 2019, 38(4): 70-80. DOI
[26]	DEMETS C, GORDON R G, ARGUS D F. Geologically current plate motions[J]. Geophysical Journal International, 2010, 181(1): 1-80.
[27]	ARGUS D F, GORDON R G, DEMETS C. Geologically current motion of 56 plates relative to the no-net-rotation reference frame[J]. Geochemistry, Geophysics, Geosystems, 2011, 12(11): Q11001.
[28]	KLISCHIES M, PETERSEN S, DEVEY C W. Geological mapping of the Menez Gwen segment at 37°50’N on the Mid-Atlantic Ridge: Implications for accretion mechanisms and associated hydrothermal activity at slow-spreading mid-ocean ridges[J]. Marine Geology, 2019, 412: 107-122.
[29]	范庆凯. 超慢速洋中脊构造特征及热液驱动机制:以西南印度洋中脊49°—52°E为例[D]. 北京: 北京大学, 2020.
	FAN Q K. Characteristics of ultra-slow spreading ridge and hydrothermal driving mechanism: Taking the Southwest Indian Ridge 49°-52°E as an example[D]. Beijing: Peking University, 2020.