A geoelectrical model of the Barguzin basin in the Baikal Rift Zone

Эпов, М.И.; Неведрова, Н Н; Санчаа, А М

doi:10.1016/j.rgg.2007.06.001

Cited by 10 publications

(9 citation statements)

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“…The Barguzin basin (Figure 2) belongs to the BRS and is limited to the northwest by a series of SW–NE directed en echelon active normal faults that separate the basin (∼500 m high) from the up to 2600 m high Barguzin range (Figure 2) [e.g., Florensov , 1960; Solonenko , 1968, 1981; Delvaux et al , 1997; Epov et al , 2007; Lunina and Gladkov , 2007]. To the east, the basin is separated from the Ikat mountains by another set of small‐offset SW–NE normal faults.…”

Section: Discussionmentioning

confidence: 99%

“…To the east, the basin is separated from the Ikat mountains by another set of small‐offset SW–NE normal faults. The basin infill is asymmetric with a greater sediment thickness (up to 2.5 km) on its western side near the Barguzin range [e.g., Solonenko , 1981; Nevedrova and Epov , 2003; Epov et al , 2007]. A borehole within the central Barguzin basin crossed the entire Quaternary and Cenozoic series and reached the basement at 1400 m [ Florensov , 1982].…”

Section: Discussionmentioning

confidence: 99%

“…Finally, the Quaternary series are made of unconsolidated conglomerates, gravels, sandstones and siltstones. Several blocks of uplifted basement have been identified within the basin [ Florensov , 1960; Nevedrova and Epov , 2003; Epov et al , 2007]. From sedimentary data, the evolution of the Barguzin basin started during middle Pliocene times when the “fast rifting” stage initiated in the Baikal rift.…”

Section: Discussionmentioning

confidence: 99%

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How old is the Baikal Rift Zone? Insight from apatite fission track thermochronology

et al. 2009

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[1] Apatite fission track analysis (AFTA) data are used to bring new light on the long-term and recent history of the Baikal rift region (Siberia). We describe the evolution of the topography along a NW-SE profile from the Siberian platform to the Barguzin range across the Baikal-southern Patom range and the northern termination of Lake Baikal. Our results show that the Baikal-Patom range started to form in the Early Carboniferous and was reactivated in Middle Jurassic-Lower Cretaceous times during the orogenic collapse of the Mongol-Okhotsk belt. Samples located in the Siberian platform recorded a continuous sedimentation up to the early Carboniferous but remain unaffected by later tectonic episodes. The Barguzin basin probably started to form as early as Late Cretaceous, suggesting a continuum of deformation between the postorogenic collapse and the opening of the Baikal Rift System (BRS). The initial driving mechanism for the opening of the BRS is thus independent from the India-Asia collision. AFTA show a late Miocene-early Pliocene increase in tectonic extension in the BRS that confirms previous thoughts and might reflect the first significant effect of the stress field generated by the India-Asia collision.Citation: Jolivet, M., T.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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How old is the Baikal Rift Zone? Insight from apatite fission track thermochronology

et al. 2009

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“…Поскольку ни происхождение, ни тем более сохранение мерзлоты на таких глубинах не находило объяснения с позиций теории ее образования и повышенных геотермических условий впадины, установленное явление, несмотря на то, что подобное строение геотермических разрезов известно в Западной Сибири [Porkhaev, 1964], было подвергнуто острой критике, вплоть до выражения недоверия фактическим данным бурения и геофизических исследований [Efimov, Dukhin, 1966;Nekrasov, Lee, 1967], и забыто. Однако результаты современной интерпретации материалов электроразведочных работ, выполненных в середине прошлого века, с использованием программ математического моделирования и инверсии, а также географических информационных систем, показали их высокую эффективность в уточнении блокового строения тектонических структур Байкальской рифтовой зоны, осложненных присутствием многолетней мерзлоты [Epov et al, 2007].…”

Section: Discussionunclassified

Geological Factors and Physicochemical Processes of Groundwater Formation in the Tunka Depression

Pavlov¹,

Чудненко²,

Голубев³

et al. 2018

Geodin. tektonofiz.

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The article describes the complex hydrogeological conditions of the Baikal rift zone viewed as a large structural element and pioneers in distinguishing two independent hydraulic systems in the study area. Groundwater resources and compositions of groundwater in these two systems are generated in fundamentally different ways. In the deep sediment layers, groundwater generated due to sedimentation is at the stage of elision (exfiltration) water exchange. Active phase transition of clay minerals to hydromica causes an additional water release, and sedimentary water and regenerated groundwater infiltrate from the condensed clay strata to sandy horizons. This process is accompanied by decompaction, heaving sand, and high (extra-high) reservoir pressures. Nitrogen-rich water and carbonic thermal water associated with faults and fault nodes are widespread in the basement of the Tunka depression. The thermal water result from infiltration and, together with fresh water, represents a uniform hydraulic system. Its development is determined by the dynamics of infiltration water in the water-feeding area in the Tunka loaches. At different hypsometric levels of the hydrogeological section, nitrogen-rich water descends, while carbonic thermal water ascends, and these processes occur simultaneously. Our study is focused on the physicochemical processes of the interaction between groundwater and sedimentary and crystalline rocks. It shows that the ion-salt and gas compositions of not only nitrogen-rich thermal water, but also those of methane water and carbonic thermal water occur in the 'water-rock' system without involving any additional substance from external sources. Compared to other thermal water, the composition of carbonic water is formed in a more complex way: first, it goes through the stage of the nitrogen-rich thermal water while passing through the aluminosilicate rocks and only then interacts with the carbonate rocks and become carbonic. The formation of carbonic water is accompanied by intensive karst processes at depths, which are ceasing closer to the surface. As a result of degassing, an opposite process is activated: authigenic minerals and travertines are formed on the surface. Groundwater and its gas phase are involved in the formation of rocks with a negative temperature, which are abundant in the Tunka depression, as well as large positive forms of the relief. It is shown that the activity of groundwater is not limited to the role of a filler in the host rocks and an intermediary medium between different geospheres. Groundwater is an active agent that initiates, controls and implements many geological processes.

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“…The electrical resistivity method provides wide applications in structural (Caglari & Duvarci, 2001;Epov et al, 2007), sedimentary (Bersezio et al, 2007), hydrogeological (Zouhri et al, 2004;Asfahani, 2006;Guellala et al, 2009) and geothermal (Majumdar et al, 2000) studies.…”

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confidence: 99%

New Elements on the Hairech Metamorphic Massif Structure (Northwest Tunisia). Geoelectrical Prospecting Contribution

Guellala¹,

Inoubli²,

Amri³

2011

JGG

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A geoelectrical survey was carried out in order to better understand the subsurface geology of the metamorphic massif of Hairech (Tunisia). Over 50 Schlumberger electrical soundings were performed using a maximum electrode spacing of 3000 m. The carried out qualitative interpretation of resistivity distributions for various depths is based on apparent resistivity maps that were constructed for different AB spacings.Quantitatively, the measured resistivity values were one-dimensionally interpreted. The already drilled boreholes and the position of some electrical soundings on geological outcrops have been helpful for electrical data calibration.The results of the vertical electrical soundings reveal that the metamorphic Hairech massif, correspond to a folded structure which is affected by deep trending east-west to northeast-southwest faults.

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A geoelectrical model of the Barguzin basin in the Baikal Rift Zone

Cited by 10 publications

References 0 publications

How old is the Baikal Rift Zone? Insight from apatite fission track thermochronology

How old is the Baikal Rift Zone? Insight from apatite fission track thermochronology

Geological Factors and Physicochemical Processes of Groundwater Formation in the Tunka Depression

New Elements on the Hairech Metamorphic Massif Structure (Northwest Tunisia). Geoelectrical Prospecting Contribution

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