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Готові списки джерел за темами / Mid-lithospheric discontinuity

Добірка наукової літератури з теми "Mid-lithospheric discontinuity"

Автор: Grafiati

Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Mid-lithospheric discontinuity"

1

Tharimena, Saikiran, Catherine A. Rychert, and Nicholas Harmon. "Seismic imaging of a mid-lithospheric discontinuity beneath Ontong Java Plateau." Earth and Planetary Science Letters 450 (September 2016): 62–70. http://dx.doi.org/10.1016/j.epsl.2016.06.026.

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2

Goev, A. G. "Deep velocity structure of the eastern margin of the Sarmatian protocraton based on the «Aleksandrovka» seismic station data from the receiver function technique." Moscow University Bulletin. Series 4. Geology, no. 6 (February 6, 2023): 88–94. http://dx.doi.org/10.33623/0579-9406-2022-6-88-94.

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Анотація:

A velocity section was obtained to a depth of about 250 km on the eastern margin of the Sarmatia protocraton (East-European Craton) based on P receiver functions (PRF). Seismograms of the new broadband station «Aleksandrovka» were used as initial data. The section reveals the main seismic boundaries, and also shows the presence of mid-lithospheric discontinuity in the upper mantle (MLD).

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3

Kind, R., X. Yuan, J. Mechie, and F. Sodoudi. "Structure of the upper mantle in the north-western and central United States from USArray S-receiver functions." Solid Earth Discussions 7, no. 1 (March 6, 2015): 1025–57. http://dx.doi.org/10.5194/sed-7-1025-2015.

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Abstract. We used more than 40 000 S-receiver functions recorded by the USArray project to study the structure of the upper mantle between the Moho and the 410 km discontinuity from the Phanerozoic western United States to the cratonic central US. We obtained clear observations of downward velocity reductions in the uppermost mantle which are commonly interpreted as the lithosphere-asthenosphere boundary (LAB) in the western US and as the mid-lithospheric discontinuity (MLD) in the cratonic US. We observe the western LAB reaching partly to the mid-continental rift system underneath the cratonic crust. The MLD is surprisingly plunging steeply towards the west from the Rocky Mountains Front to about 200 km depth near the Sevier Thrust Belt. There is a significant break in the lithosphere at the Sevier Thrust Belt. We also observe a velocity reduction about 30 km above the 410 km discontinuity in the same region where in the western US the LAB is observed, but not in the cratonic US.

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4

Kind, R., X. Yuan, J. Mechie, and F. Sodoudi. "Structure of the upper mantle in the north-western and central United States from USArray S-receiver functions." Solid Earth 6, no. 3 (July 31, 2015): 957–70. http://dx.doi.org/10.5194/se-6-957-2015.

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Анотація:

Abstract. We used more than 40 000 S-receiver functions recorded by the USArray project to study the structure of the upper mantle between the Moho and the 410 km discontinuity from the Phanerozoic western United States to the cratonic central US. In the western United States we observed the lithosphere–asthenosphere boundary (LAB), and in the cratonic United States we observed both the mid-lithospheric discontinuity (MLD) and the LAB of the craton. In the northern and southern United States the western LAB almost reaches the mid-continental rift system. In between these two regions the cratonic MLD is surprisingly plunging towards the west from the Rocky Mountain Front to about 200 km depth near the Sevier thrust belt. We interpret these complex structures of the seismic discontinuities in the mantle lithosphere as an indication of interfingering of the colliding Farallon and Laurentia plates. Unfiltered S-receiver function data reveal that the LAB and MLD are not single discontinuities but consist of many small-scale laminated discontinuities, which only appear as single discontinuities after longer period filtering. We also observe the Lehmann discontinuity below the LAB and a velocity reduction about 30 km above the 410 km discontinuity.

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5

Zhang, Yaoyang, Ling Chen, Yinshuang Ai, and Mingming Jiang. "Lithospheric structure beneath the central and western North China Craton and adjacent regions from S-receiver function imaging." Geophysical Journal International 219, no. 1 (July 25, 2019): 619–32. http://dx.doi.org/10.1093/gji/ggz322.

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Анотація:

Summary To elucidate the nature and extent of the lithospheric modification in the central and western North China Craton (NCC) and adjacent regions, we used the wave equation–based migration technique of S-receiver function on teleseismic data collected from 314 broadband stations in this region to image the lithospheric structure. Incorporating data from previous lithospheric structure studies, we obtained unprecedented high-resolution depth maps of the lithosphere–asthenosphere boundary (LAB) and mid-lithospheric discontinuity (MLD) in the NCC. Our results show more detailed variations of the lithospheric thickness in the central and western NCC and adjacent regions, which ranges from 100 to >170 km, in marked contrast to the thinned lithosphere (60–100 km) in the eastern NCC. Despite its generally thick lithosphere (>130 km), the Ordos Block shows a concordant N–S difference from the surface to deep lithosphere with a boundary at the latitude of 37–38°N. The central NCC is laterally heterogeneous in the lithospheric structure, and the thick lithosphere (∼160 km) in the south is interpreted as a remnant cratonic mantle root. The central Qinling Orogenic Belt preserves a thick lithosphere (∼150 km), which may block the asthenospheric flow driven by extrusion of the Tibetan Plateau to the west of the NCC. Moreover, a negative MLD is widely identified at the depth of 80–110 km within the thick lithosphere, which corroborates the global existence of the MLD in continental regions. The consistence in the depth of the MLD and the shallow LAB in the eastern NCC supports the conjecture that the MLD may have played an important role in the lithospheric modification of the eastern NCC.

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6

Smart, Katie A., Sebastian Tappe, Alan B. Woodland, Chris Harris, Loretta Corcoran, and Antonio Simonetti. "Metasomatized eclogite xenoliths from the central Kaapvaal craton as probes of a seismic mid-lithospheric discontinuity." Chemical Geology 578 (September 2021): 120286. http://dx.doi.org/10.1016/j.chemgeo.2021.120286.

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7

Shi, Ya-Nan, Fenglin Niu, Zhong-Hai Li, and Pengpeng Huangfu. "Craton destruction links to the interaction between subduction and mid-lithospheric discontinuity: Implications for the eastern North China Craton." Gondwana Research 83 (July 2020): 49–62. http://dx.doi.org/10.1016/j.gr.2020.01.016.

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8

Liu, Lin, Simon L. Klemperer, and Alexander R. Blanchette. "Western Gondwana imaged by S receiver-functions (SRF): New results on Moho, MLD (mid-lithospheric discontinuity) and LAB (lithosphere-asthenosphere boundary)." Gondwana Research 96 (August 2021): 206–18. http://dx.doi.org/10.1016/j.gr.2021.04.009.

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9

Saha, Sriparna, Rajdeep Dasgupta, and Kyusei Tsuno. "High Pressure Phase Relations of a Depleted Peridotite Fluxed by CO2 -H2 O-Bearing Siliceous Melts and the Origin of Mid-Lithospheric Discontinuity." Geochemistry, Geophysics, Geosystems 19, no. 3 (March 2018): 595–620. http://dx.doi.org/10.1002/2017gc007233.

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10

Peng, Ye, and Mainak Mookherjee. "Thermoelasticity of tremolite amphibole: Geophysical implications." American Mineralogist 105, no. 6 (June 1, 2020): 904–16. http://dx.doi.org/10.2138/am-2020-7189.

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Анотація:

Abstract We investigated the structure, equation of state, thermodynamics, and elastic properties of tremolite amphibole [Ca2Mg5Si8O22(OH)2] up to 10 GPa and 2000 K, using first principles simulations based on density functional perturbation theory. We found that at 300 K, the pressure-volume results can be adequately described by a third-order Birch-Murnaghan equation of state with bulk moduli K0 of 78.5 and 66.3 GPa based on local density approximation (LDA) and generalized gradient approximation (GGA), respectively. We also derived its coefficients of the elastic tensor based on LDA and GGA and found that the LDA result is in good agreement with the experimental results. At 300 K, the shear modulus G0 is 58.0 GPa based on LDA. The pressure derivative of the bulk modulus K′ is 5.9, while that of the shear modulus G′ is 1.3. The second Grüneisen parameter, or δT = [–1/(αKT)](∂KT/∂T)P, is 3.3 based on LDA. We found that at ambient conditions, tremolite is elastically anisotropic with the compressional wave velocity anisotropy AVP being 34.6% and the shear wave velocity anisotropy AVS being 27.5%. At higher pressure corresponding to the thermodynamic stability of tremolite, i.e., ~3 GPa, the AVP reduces to 29.5%, whereas AVS increases to 30.8%. To evaluate whether the presence of hydrous phases such as amphibole and phlogopite could account for the observed shear wave velocity (VS) anomaly at the mid-lithospheric discontinuity (MLD), we used the thermoelasticities of tremolite (as a proxy for other amphiboles), phlogopite, and major mantle minerals to construct synthetic velocity profiles. We noted that at depths corresponding to the mid-lithosphere, the presence of 25 vol% amphibole and 1 vol% phlogopite could account for a VS reduction of 2.3%. Thus based on our thermoelasticity results on tremolite amphibole, it seems that mantle metasomatism could partly explain the MLD.

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Більше джерел

Тези доповідей конференцій з теми "Mid-lithospheric discontinuity"

1

Qionghua, Guo, Huilin Wang, and Huilin Wang. "THE EFFECT OF MID-LITHOSPHERIC DISCONTINUITY ON THE STABILITY OF CRATON." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-356967.

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