Geology, magmatism, metallogeny, and geodynamics of the South Kuril islands

Хомич, В. Г.; Kasatkin, S. A.

doi:10.1016/j.oregeorev.2018.12.015

Cited by 21 publications

(11 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Southern part of the KKT differ, as proved by recent findings (Khomich et al, 2019) where it is demonstrated on the example of South Kuril that intense fluid thermal fluxes in the continental lithosphere cause of the formation of magmatic chambers and the development of volcanism and multi-metal ores. Over 700 earthquakes with hypo-centers >50 km are recorded in the KKT focal zone (Beck & Ruff, 1987).…”

Section: Discussionmentioning

confidence: 85%

GMT-based geological mapping and assessment of the bathymetric variations of the Kuril-Kamchatka Trench, Pacific Ocean

Lemenkova

2020

Natural and Engineering Sciences

View full text Add to dashboard Cite

This manuscript summarizes the results of the geospatial analysis undertaken by means of Generic Mapping Tools (GMT). The comparative assessment of the bathymetry of the Kuril-Kamchatka hadal trench was performed for southern and northern segments separated by the Bussol Strait. The formation of the hadal trench is affected by the impacts of local geological and geophysical settings varying along the trench. The methodological approach is as follows. The profiling was undertaken using GMT modules 'grdimage', 'grdtrack' and 'psxy'. The modelling consists of the collected data of 10706 observation samples from 52 profiles in southern part and 12726 from 62 profiles in the northern segment. The GMT modules 'psrose' and 'pshistograms' were used to plot histograms and rose diagrams visualizing bathymetric variables of depths. The geology was mapped using GMT modules 'pscoast', 'grdcut', 'grdcontour' and 'psxy' to plot lineaments and geological objects (ophiolites, faults, earthquakes, trench, magnetic anomalies, tectonic slabs, fracture zones and volcanoes). The base map is based on the ETOPO Global Relief Model. The comparison of the bathymetry shown variations in the northern and southern segments: southern part reaches-8,200 m maximal depths while northern has-7,800 m. This is influenced by the geological settings: earthquakes magnitude and seismisity are higher in the southwest. The submarine terraces and floodplains were observed at-4000 m depth forming landforms located southwards off the Bussol Strait. This geospatial analysis contributes to the development of the geological mapping with an example of the Kamchatka area, a region with high seismisity and repeated earthquakes.

show abstract

Section: Discussionmentioning

confidence: 85%

GMT-based geological mapping and assessment of the bathymetric variations of the Kuril-Kamchatka Trench, Pacific Ocean

Lemenkova

2020

Natural and Engineering Sciences

View full text Add to dashboard Cite

show abstract

“…Современная их активность в южной части Охотского моря доказывается глубинными (до 680 км и более) землетрясениями, сопровождавшимися резким повышением интенсивности истечения подводных газовых струй. Привлекают внимание не только факты размещения в земной коре над РЗТТ мест сосредоточения вулканических сооружений, флюидно-газовых проявлений, сольфатар, рудных узлов на островах южного Охотоморья [83], но и особенности строения геофизических полей на о. Сахалин, подчеркивающие влияние глубинной геодинамики на ориентацию положительных магнитных аномалий и градиентных зон поля силы тяжести (рис. 2).…”

Section: Discussionunclassified

Ore, Oil-and-Gas Regions of the South Okhotsk Sea Province and Deep Geodynamics

Хомич¹,

Борискина²

2020

View full text Add to dashboard Cite

In the South Okhotsk Sea province – on the islands of Sakhalin, Kunashir, Iturup, Urup and surrounding sea areas – many occurrences of rare, noble metal and other mineralizations as well as of oil-and-gas fields, gas hydrate accumulations, and isolated areas of active emission of water-hydrocarbon gases are known. Occurrences and deposits of solid, liquid and gaseous mineral resources are controlled by hidden deep fault transform zones: Nosappu (Tuscarora), Iturup, and Urup. These long-lived extended (more than 1000 km) zones are distinguished at the N-W Pacific megaplate margin near the S-E flank of the Kuril-Kamchatka trogue. Using the seismotomographic methods we have established their extension to the west from the seismic focal zone in the oceanic slab that subducted into the transition zone of the mantle. In the areas of strike-slip extension the faults accounted for the active formation of the drainage channels for the penetration of the sea water in the lithosphere with the following serpentinization of its ultramafites, and for decompressional generation of ascending mantle-derived abiogenic fluid flows. The latter penetrated from the underslab asthenosphere in the oversubduction mantle wedge and beneath the lithospheric mantle, where they accounted for the development of the processes of metasomatism. The subsequent migration of flows initiated the creation of primary magma reservoirs in the lower parts of the continental lithosphere, and intermediate and peripheral chambers in the Earth’s crust. The injection of melts from the chambers in the consolidated Earth's crust led to the formation of abyssal, hypabyssal intrusive massifs, arch-dome uplifts and magmatogenic-ore (ore-magmatic) systems predominantly among the rocks of the pre-Pliocene basement. The concentration of oil and gas accumulations mainly from the mantle-derived abiogenic hydrocarbons containing mercury, gold, rhenium, and PGE in the Cenozoic sedimentary basins amidst the reservoirs under the impermeable beds also resulted from deep under- and overslab fluid flows.

show abstract

“…The southern part of the Greater Kuril Chain includes the large Kunashir, Iturup, and Urup islands constituting the islands-arc-trench system. This part is confined to the northwestern Pacific subduction zone [16]. The topographic and geomorphic features of the trench in its northern part are different from those located further southwards near the group of the seamounts.…”

Section: Geographic Settingsmentioning

confidence: 92%

Awk and Gnu Octave Programming Languagesintegrated With Generic Mapping Tools for Geomorphological Analysis

Lemenkova

2019

GSE

View full text Add to dashboard Cite

The paper presents a sequential use of the AWK and GNU Octave programming languages integrated with Generic Mapping Tools (GMT) for geospatial data analysis. The geographic scope of the research is focused on the Kuril-Kamchatka Trench, north Pacific Ocean. Practical research aim is to analyse and compare bathymetry in the southern and northern part of the trench using digitized crosssection profiles. The initial mapping and geospatial analysis was performed in GMT scripting toolset. The GMT was used for cartographic mapping based on the raster ETOPO1 grid and automatic digitizing of the profiles crossing the trench perpendicularly. Besides visualized map, the processed geodata were received in a numerical form as a complex multi-field table for each segment. These tables were generated by the GMT in its native format and could not be directly processed by the MATLAB/Octave. Therefore, the tables were exported to AWK, a data-driven programming language and a powerful tool for data extraction. The table was then restructured, sorted and reshaped by the AWK script. Because the total amount of profiles overstepped 100 (62 and 52 for the northern and southern trench segments), only selected profiles were visualized. For this purpose, at the next step the modified tables were converted to GNU Octave language for visualizing and plotting selected profiles. Finally, the geomorphology was analysed and two segments compared. The results show that the southern part has deeper bathymetric values, vary in geomorphic structure and has steeper gradient slopes comparing to the north, which is caused by the seismicity, volcanism, geologic and tectonic settings. Three full scripts of GMT, AWK and GNU Octave programming languages are presented for replicability in the Appendix.

show abstract

Geology, magmatism, metallogeny, and geodynamics of the South Kuril islands

Cited by 21 publications

References 24 publications

GMT-based geological mapping and assessment of the bathymetric variations of the Kuril-Kamchatka Trench, Pacific Ocean

GMT-based geological mapping and assessment of the bathymetric variations of the Kuril-Kamchatka Trench, Pacific Ocean

Ore, Oil-and-Gas Regions of the South Okhotsk Sea Province and Deep Geodynamics

Awk and Gnu Octave Programming Languagesintegrated With Generic Mapping Tools for Geomorphological Analysis

Contact Info

Product

Resources

About