Present-day tectonic regime and stress patterns from the formal inversion of focal mechanism data, in the North of Central–East Iran Blocks

Naimi‐Ghassabian, Nasser; Khatib, M. M.; Nazari, Hamid; Heyhat, Mahmoudreza

doi:10.1016/j.jafrearsci.2015.07.018

Cited by 19 publications

(11 citation statements)

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“…In this paper, the conjugate shear joint occurrence is corrected by the stereo projection analysis software Stereonet 10.0, and the a shear joint inversion tectonic stress field is insufficient, and the reliability of conjugate shear joint inversion is greatly improved. Therefore, conjugate shear joints are commonly used in geological research to invert paleo-tectonic stress fields (Negrete-Aranda et al, 2010;Federico, Crispini, & Capponi, 2010;Veloso et al, 2015;Mazzoli, Santini, Macchiavelli, & Ascione, 2015;Naimi-Ghassabian, Khatib, Nazari, & Heyhat, 2015). The distribution of joints produced by the same tectonic stress field has a certain regularity, usually a large area is developed in the rock mass to form a specific structural pattern.…”

Section: Principle Of Inversion Of Paleotectonic Stress Field By Conjmentioning

confidence: 99%

Paleo-tectonic Stress Field and Tectonic Evolution since the Mesozoic in the Eastern Mining Area of Pingdingshan

Gong

2019

Earth sci. res. j.

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By observing a large number of conjugate shear joint data in the field and underground of the study area, the conjugate shear joint data is analyzed by the stereographic projection method, and the paleo-tectonic stress field experienced in the mining area since the Mesozoic is inferred. Based on the above research, the tectonic evolution process of the eastern mining area of Pingdingshan is discussed from the aspect of dynamic mechanism. The results show that: (1) The eastern mining area of Pingdingshan experienced the Indosinian, Yanshan early-middle, Yanshanian, and Xishanian tectonic stress fields, with the directions of NS, NW, NE, and NNE, respectively. (2) The tectonic evolution of the mining area can be divided into four stages: (a) The Indosinian tectonic stress field has the weakest effect on the study area, the coal-bearing strata are gradually uplifted by the stress field in this period, and some small structures are formed in the coal-bearing strata; (b) The early-middle Yanshanian tectonic stress field has a certain transformation effect on the coal-bearing strata in the eastern part of Pingdingshan. It mainly forms the secondary structure of the mining area such as Huoyan normal fault and small fault-fracture structure; (c) The late Yanshanian tectonic stress field has the strongest effect, and the control complex fold structure with the axis near NW direction is formed under the tectonic stress field of this period, such as Likou syncline, Baishishan anticline, Lingwushan syncline, Guozhuang anticline, Niuzhuang syncline, etc. The near-NW direction of the control fault structure is also formed under the action of the late Yanshanian tectonic stress field, such as the Niuzhuang reverse fault, the original No.11 mine reverse fault, etc.; (d) The Himalayan tectonic stress field mainly forms some secondary and small structures in the mining area and has a certain transformation effect on the structure formed by the early tectonic stress field. The tectonic pattern of the eastern mining area of Pingdingshan is the result of the above-mentioned tectonic stress field acting in sequence with the coal-bearing strata, causing structural deformation of the coal seam.

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Section: Principle Of Inversion Of Paleotectonic Stress Field By Conjmentioning

confidence: 99%

Paleo-tectonic Stress Field and Tectonic Evolution since the Mesozoic in the Eastern Mining Area of Pingdingshan

Gong

2019

Earth sci. res. j.

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“…The determination of present-day tectonic stress and stress regime based on the inversion of earthquake focal mechanisms has been studied by several authors (e.g., Angelier 1984Angelier , 1989Gephart and Forsyth 1984;Delvaux et al 1995). The inversion is mainly based on the assumption that (a) the stress field is uniform and invariant in space and time, and (b) slip on a plane occurs in the direction of the maximum resolved shear stress (Bott 1959;Etchecopar et al 1981;Delvaux and Barth 2010;Baruah et al 2013;Naimi-Ghassabian et al 2015).…”

Section: Tectonic Stress Inversionmentioning

confidence: 99%

“…Initially, both the nodal planes for each focal mechanism are inverted to a stress tensor, then the plane that is best explained by the stress tensor (namely smaller value of function F5 in the program) is selected and viewed as the actual focal plane. After the separation, the following inversion then includes only the focal planes that are best fitted by a uniform stress field (Gephart and Forsyth 1984;Delvaux and Barth 2010;Naimi-Ghassabian et al 2015).…”

Section: Tectonic Stress Inversionmentioning

confidence: 99%

“…Tectonic stress is one of the fundamental datasets in Earth Sciences comparable with topography, gravity, heat flow and others (Sperner et al 2003). Thus, an investigation into the crustal tectonic stresses is a key point in earth geotectonic studies (Hou et al 2006;Lunina and Gladkov 2007;Ju et al 2013aBaruah et al 2013Baruah et al , 2016Naimi-Ghassabian et al 2015). Furthermore, knowledge of the tectonic stress field can be used in the hydrocarbon industry to foresee stability problems and tectonic fractures (Ju et al 2013b(Ju et al , 2014(Ju et al , 2015, and to optimize reservoir management through tectonic modelling (Sperner et al 2003).…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, knowledge of the tectonic stress field can be used in the hydrocarbon industry to foresee stability problems and tectonic fractures (Ju et al 2013b(Ju et al , 2014(Ju et al , 2015, and to optimize reservoir management through tectonic modelling (Sperner et al 2003). In general, the focal mechanism data and their analysis allow and facilitate a revisiting of tectonic interpretations of the present-day stress field (Delvaux and Barth 2010;Naimi-Ghassabian et al 2015). The stress patterns obtained from formal stress inversion of focal mechanism solutions can reveal many things in the stress field that were not captured by large-scale numerical models of previous studies.…”

Section: Introductionmentioning

confidence: 99%

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Tectonic stress pattern in the Chinese Mainland from the inversion of focal mechanism data

Sun

2017

J Earth Syst Sci

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The tectonic stress pattern in the Chinese Mainland and kinematic models have been subjected to much debate. In the past several decades, several tectonic stress maps have been figured out; however, they generally suffer a poor time control. In the present study, 421 focal mechanism data up to January 2010 were compiled from the Global/Harvard CMT catalogue, and 396 of them were grouped into 23 distinct regions in function of geographic proximity. Reduced stress tensors were obtained from formal stress inversion for each region. The results indicated that, in the Chinese Mainland, the directions of maximum principal stress were ∼NE-SW-trending in the northeastern region, ∼NEE-SWW-trending in the North China region, ∼N-S-trending in western Xinjiang, southern Tibet and the southern Yunnan region, ∼NNE-SSW-trending in the northern Tibet and Qinghai region, ∼NW-SE-trending in Gansu region, and ∼E-W-trending in the western Sichuan region. The average tectonic stress regime was strikeslip faulting (SS) in the eastern Chinese Mainland and northern Tibet region, normal faulting (NF) in the southern Tibet, western Xinjiang and Yunnan region, and thrust faulting (TF) in most regions of Xinjiang, Qinghai and Gansu. The results of the present study combined with GPS velocities in the Chinese Mainland supported and could provide new insights into previous tectonic models (e.g., the extrusion model). From the perspective of tectonics, the mutual actions among the Eurasian plate, Pacific plate and Indian plate caused the present-day tectonic stress field in the Chinese Mainland.

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Characteristics and formation mechanism of the fractures in Archaean buried hill: A case study in the BZ19‐6 Block, Bohai Bay Basin, China

Dai

Tang

Li³

et al. 2020

Geological Journal

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While Archean buried hill fractured reservoirs have been found for the first time in the BZ19‐6 Block of the Bozhong Sag in the Bohai Bay Basin, the mechanisms driving their creation and evolution are not well known for low degree of exploration. Using core data, image logs, and our knowledge of the regional geology, we characterized the features and explored the formation mechanisms of these fractures. Our core samples captured two types of fractures: high‐angle shear fractures and low‐ to moderate‐angle tensile fractures. Based on the cross‐cutting relationships, four distinct sets of fractures formed at different stages and related to different tectonic events. The first fracture set (Set I) is high‐angle shear fractures having an E‐W orientation, partially filled by calcite, and was formed by transpressive processes in the Early Yanshanian. The second fracture set (Set II) is characterized by moderate angles, partially filled by asphalt and calcite with variable orientations and a more mesh‐like appearance, formed in an extensional environment in the middle Yanshanian. During transpressive activities in the Late Yanshanian, the high‐angle shear fractures of the third fracture set (Set III) formed with NW‐SE orientations and partially filled by asphalt. The fourth fracture set (Set IV), which occurred in the Early Himalayan, involves high‐angle shear fractures that is oriented in the NE‐SW direction and only part of them are filled by clay minerals. Macroscopic fracture features, orientations, and distribution patterns can significantly alter the nature of a reservoir; the fractures in Set I (E‐W‐oriented) and III (NW‐SE‐oriented) are typically the widest (excluded fills), and they tend to have the greatest impact on the overall reservoir permeability.

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Present-day tectonic regime and stress patterns from the formal inversion of focal mechanism data, in the North of Central–East Iran Blocks

Cited by 19 publications

References 47 publications

Paleo-tectonic Stress Field and Tectonic Evolution since the Mesozoic in the Eastern Mining Area of Pingdingshan

Paleo-tectonic Stress Field and Tectonic Evolution since the Mesozoic in the Eastern Mining Area of Pingdingshan

Tectonic stress pattern in the Chinese Mainland from the inversion of focal mechanism data

Characteristics and formation mechanism of the fractures in Archaean buried hill: A case study in the BZ19‐6 Block, Bohai Bay Basin, China

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