scholarly journals Bathymetric roughness of the Southeast Indian Ridge: Implications for crustal accretion at intermediate spreading rate mid-ocean ridges

1997 ◽  
Vol 102 (B8) ◽  
pp. 17697-17711 ◽  
Author(s):  
L. Ying Ma ◽  
James R. Cochran
Keyword(s):  
Spreading Rate ◽  
Crustal Accretion ◽  
Ocean Ridges ◽  
Southeast Indian Ridge ◽  
Indian Ridge

scholarly journals The Southeast Indian Ridge between 88°E and 118°E: Variations in crustal accretion at constant spreading rate

1997 ◽  
Vol 102 (B7) ◽  
pp. 15489-15505 ◽  
Author(s):  
Jean-Christophe Sempéré ◽  
James R. Cochran
Keyword(s):  
Spreading Rate ◽  
Crustal Accretion ◽  
Southeast Indian Ridge ◽  
Indian Ridge

scholarly journals The Southeast Indian Ridge between 88°E and 118°E: Gravity anomalies and crustal accretion at intermediate spreading rates

1997 ◽  
Vol 102 (B7) ◽  
pp. 15463-15487 ◽  
Author(s):  
James R. Cochran ◽  
Jean-Christophe Sempéré
Keyword(s):  
Gravity Anomalies ◽  
Crustal Accretion ◽  
Southeast Indian Ridge ◽  
Indian Ridge ◽  
Spreading Rates

scholarly journals Time‐Dependent Crustal Accretion on the Southeast Indian Ridge Revealed by Malaysia Airlines Flight MH370 Search

2020 ◽  
Vol 47 (12) ◽  
Author(s):  
Ross Parnell‐Turner ◽  
Shi J. Sim ◽  
Jean‐Arthur Olive
Keyword(s):  
Time Dependent ◽  
Crustal Accretion ◽  
Southeast Indian Ridge ◽  
Indian Ridge

scholarly journals Supplemental Material: Large-scale asymmetry in thickness of crustal accretion at the Southeast Indian Ridge due to deep mantle anomalies

2020 ◽  
Author(s):  
Yanhui Suo ◽  
Sanzhong Li ◽  
Xianzhi Cao
Keyword(s):  
Large Scale ◽  
Crustal Thickness ◽  
Crustal Accretion ◽  
Deep Mantle ◽  
Southeast Indian Ridge ◽  
Indian Ridge

Figures S1 and S2, including the previous Euler Poles of Australia relative to Antarctica and the results of the asymmetric anomaly contributed by different factors; Table S1: The parameters of the Euler Poles we used in this study. Dataset (grid format) of our resulted crustal thickness.

Magma transport beneath mid-ocean ridges

2021 ◽  
Author(s):  
Shi Sim ◽  
Marc Spiegelman ◽  
Dave Stegman ◽  
Cian Wilson
Keyword(s):  
Temporal Variations ◽  
Spreading Rate ◽  
Two Phase ◽  
Long Period ◽  
Ocean Ridges ◽  
Magma Transport ◽  
Southeast Indian Ridge ◽  
Melt Transport ◽  
Phase Models ◽  
Numerical Explorations

<p>Melt transport beneath the lithosphere is elusive. With a distinct viscosity and density from the surrounding mantle, magmatic melt moves on a different time scale as the surrounding mantle. To resolve the temporal scale necessary to accurately capture melt transport in the mantle, the model simulations become numerically expensive quickly. Recent computational advances make possible two-phase numerical explorations to understand magma transport in the mantle. We review results from a suite of two-phase models applied to the mid-ocean ridges, where we varied half-spreading rate and intrinsic mantle permeability using new openly available models, with the goal of understanding melt focusing beneath mid-ocean ridges and its relevance to the lithosphere-asthenosphere boundary (LAB). Here, we highlight the importance of viscosities for the melt focusing mechanisms. In addition, magmatic porosity waves that are a natural consequence of these two-phase flow formulations. We show that these waves could explain long-period temporal variations in the seafloor bathymetry at the Southeast Indian Ridge.</p>

The Xigaze ophiolite: fossil ultraslow-spreading ocean lithosphere in the Tibetan Plateau

2020 ◽  
pp. jgs2020-208
Author(s):  
Tong Liu ◽  
Chuan-Zhou Liu ◽  
Fu-Yuan Wu ◽  
Henry J.B. Dick ◽  
Wen-Bin Ji ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Spreading Rate ◽  
Southwest Indian Ridge ◽  
The Tibetan Plateau ◽  
Crustal Accretion ◽  
Ocean Ridges ◽  
Magma Supply ◽  
Spreading Ridges ◽  
Ocean Lithosphere ◽  
Lower Crustal

The crust and mantle in both ophiolites (fossil ocean lithosphere) and in modern oceans are enormously diverse. Along-axis morphology and lower crustal accretion at ultraslow-spreading ocean ridges are fundamentally different from those at faster-spreading ridges, and are key to understanding how crustal accretion varies with spreading rate and magma supply. Ultraslow-spreading ridges provide analogs for ophiolites, to identify those that may have formed under similar conditions. Parallel studies of modern ocean lithosphere and ophiolites therefore can uniquely inform the origin and genesis of both. Here we report the results of structural and petrological studies on the Xigaze ophiolite in the Tibetan Plateau, and compare it to the morphology and deep drilling results at the ultraslow-spreading Southwest Indian Ridge. The Xigaze ophiolite has a complete but laterally discontinuous crust, with discrete diabase dikes/sills cutting both mantle and lower crust. The gabbro units are thin (∼350 m) and show upward cyclic chemical variations, supporting for an episodic and intermittent magma supply. These features are comparable to the highly focused magmatism and low magma budget at modern ultraslow-spreading ridges. Thus we suggest that the Xigaze ophiolite represents an on-land analog of ultraslow-spreading ocean lithosphere.

The Southeast Indian Ridge between 127° and 132°40′E: contrasts in segmentation characteristics and implications for crustal accretion

1996 ◽  
Vol 118 (1) ◽  
pp. 1-15 ◽  
Author(s):  
Jean-Christophe Sempéré ◽  
Brian P. West ◽  
Louis Géli
Keyword(s):  
Crustal Accretion ◽  
Southeast Indian Ridge ◽  
Indian Ridge

scholarly journals Supplemental Material: Large-scale asymmetry in thickness of crustal accretion at the Southeast Indian Ridge due to deep mantle anomalies

2020 ◽  
Author(s):  
Yanhui Suo ◽  
Sanzhong Li ◽  
Xianzhi Cao
Keyword(s):  
Large Scale ◽  
Crustal Thickness ◽  
Crustal Accretion ◽  
Deep Mantle ◽  
Southeast Indian Ridge ◽  
Indian Ridge

Figures S1 and S2, including the previous Euler Poles of Australia relative to Antarctica and the results of the asymmetric anomaly contributed by different factors; Table S1: The parameters of the Euler Poles we used in this study. Dataset (grid format) of our resulted crustal thickness.

Large-scale asymmetry in thickness of crustal accretion at the Southeast Indian Ridge due to deep mantle anomalies

2020 ◽  
Author(s):  
Yanhui Suo ◽  
Sanzhong Li ◽  
Xianzhi Cao
Keyword(s):  
Large Scale ◽  
Shear Velocity ◽  
Oceanic Lithosphere ◽  
Small Scale ◽  
Mantle Plumes ◽  
Crustal Accretion ◽  
Southeast Indian Ridge ◽  
Indian Ridge ◽  
Tethys Ocean ◽  
Mantle Temperature

Hot mantle plumes and ancient cold slabs have been observed beneath modern mid-ocean ridges, but their specific and detailed effects on mid-ocean ridge crustal accretion are poorly understood. The oceanic lithosphere beneath the Southeast Indian Ocean displays unique morphological, geophysical, and geochemical characteristics, which may reflect the influence of both mantle anomalies and upwelling plumes on seafloor spreading. In this study, we combined gravity-derived oceanic crustal thickness with plate tectonic reconstructions to investigate patterns of asymmetry in thickness of crust accreted at the Southeast Indian Ridge over the last 50 m.y. Our results reveal several distinct features: (1) small-scale, short-lived asymmetries in the thickness of crustal accretion of up to 0.75 km are alternatively distributed on the southern and northern flanks of the 90°−120°E Southeast Indian Ridge segment. These can be explained by variations in mantle depletion or mantle temperature. (2) Two large-scale, long-lived (duration of ∼50 m.y.) asymmetries in crustal accretion of >2.5 km are observed around the Kerguelen Plateau and Balleny Islands, which we attribute to excess crust from the off-axis Kerguelen and Balleny mantle plumes. (3) Two large-scale, long-lived (duration of ∼50 m.y.) asymmetries in crustal accretion of 0.75−2.5 km are observed on the northern flank of the westernmost (70°−80°E) Southeast Indian Ridge and the southern flank of the eastern (120°−140°E) Southeast Indian Ridge segment, respectively. We attribute these to asymmetry in mantle temperature of up to 20−53 °C. We suggest these asymmetric temperatures across the Southeast Indian Ridge are associated with the foundered lithospheric fragments of the Indian Craton triggered by the African Large Low-Shear-Velocity Province during the breakup of Gondwanaland and an intraplate subducted slab of the Paleo-Tethys Ocean, respectively. The remnant craton fragments and subducted oceanic slab may have moved north in concert with the northward-migrating Southeast Indian Ridge beginning at 50 m.y. ago.

Evidence for spreading-rate dependence in the displacement-length ratios of abyssal hill faults at mid-ocean ridges

Geology ◽  
2000 ◽  
Vol 28 (5) ◽  
pp. 395-398 ◽  
Author(s):  
DelWayne R. Bohnenstiehl ◽  
Martin C. Kleinrock
Keyword(s):  
Spreading Rate ◽  
Rate Dependence ◽  
Ocean Ridges
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