Opposite sense of strike‐slip faulting and crustal rotation accommodating left‐lateral shear between the Tianshan Mountains and Kazakh Platform

2021 ◽  
Author(s):  
Chuanyong Wu ◽  
Weitao Wang ◽  
Wenjun Zheng ◽  
Peizhen Zhang ◽  
Zhongyuan Yu
Keyword(s):  
Strike Slip ◽  
Tianshan Mountains ◽  
Lateral Shear

scholarly journals Structures and Kinematics of the Huanghua Depression in Bohai Bay Basin, East China: Implications for the Formation Mechanism of a Transtensional Basin

Lithosphere ◽  
2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Liguang Mao ◽  
Xianzheng Zhao ◽  
Shixun Zhang ◽  
Yumeng Su ◽  
Fengming Jin ◽  
...  
Keyword(s):  
Middle Eocene ◽  
Strike Slip ◽  
Bohai Bay ◽  
Rift Basin ◽  
Strain Partitioning ◽  
Lateral Shear ◽  
Bohai Bay Basin ◽  
Drilling Data ◽  
Huanghua Depression ◽  
Fault Structures

Abstract The Bohai Bay Basin in East Asia is a rift basin created by Cenozoic subduction of the oceanic Pacific plate beneath the Asia continent. Many prior studies suggest that the basin was initially formed in the Paleocene with the development of several NNE-trending extensional grabens, but subsequently impacted by right-lateral shear along these existing NNE-trending structures in the middle Eocene, transforming the Bohai Bay Basin into a transtensional basin and producing EW-trending grabens in the Bozhong and the northeastern Huanghua depressions. However, how this transformation occurred remains to be fully understood. Based on seismic and drilling data, we herein investigated the fault structures, basin architecture, and evolutionary stages of the Huanghua Depression in the central-west Bohai Bay Basin to examine the strain partitioning and evolution mechanism during the Paleogene syn-rifting stage. The results reveal that the Huanghua Depression is composed of three structurally distinctive zones, namely, a dextral transtensional, a NW-SE extensional, and a N-S extensional zones from southwest to northeast, which are separated from each other by two transfer zones. The NW-SE extensional zone is interpreted as a horsetail structure on the northern termination of the dextral transtensional zone. This dextral transtensional zone and the Tan-Lu Fault zone to the east served as strike-slip boundaries within which EW-trending depressions such as the northeastern Huanghua and Bozhong depressions formed in the middle Eocene.

scholarly journals LATE-AND POST-ALPINE TECTONIC EVOLUTION OF THE SOUTHERN PART OF THE ATHOS PENINSULA, NORTHERN GREECE

2018 ◽  
Vol 40 (1) ◽  
pp. 309 ◽  
Author(s):  
G. Α. Georgiadis ◽  
M. D. Tranos ◽  
D. M. Mountrakis
Keyword(s):  
Late Miocene ◽  
Middle Miocene ◽  
Strike Slip ◽  
Early Pleistocene ◽  
Stress Axis ◽  
Normal Faults ◽  
Lateral Shear ◽  
Northern Greece ◽  
Lateral Strike Slip ◽  
Tectonic Features

The boundary between Internal Hellenides and the Hellenic hinterland is exposed in the southern part of the Athos peninsula as a NE-SW trending contact between the Serbomacedonian massif and the Circum-Rhodope Belt. The main tectonic features and deformation of the area during late- and post-alpine times have been investigated in order to understand better the late orogenic processes that led to the present arrangement of this boundary. The field study showed that the prevailing structures in the southern Athos peninsula are an asymmetric, SW-plunging, NWverging mega-scale antiform and a NE-SW striking left-lateral shear zone. These structures are the result of a transpressional deformation that initiated at least since the Eocene under ductile, syn-metamorphic (low-greenschist fades) conditions and progressively changed during the Oligocene-Early Miocene to brittle conditions with E-W striking reverse faults-thrusts and NNW-SSE striking right-lateral and NESW striking left-lateral strike-slip faults. This deformation waned in Middle Miocene changing to transtension with E- W striking, left-lateral strike-slip and NW-SE rightlateral oblique to normal faults. Since the Late Miocene an extensional regime dominates the area with the least principal stress axis (σ3) orientated NE-SW during Late Miocene - Pliocene andN-Sfrom Early Pleistocene -present

Aftershocks of the Truckee, California, earthquake of September 12, 1966

1968 ◽  
Vol 58 (5) ◽  
pp. 1607-1620
Author(s):  
Roger Greensfelder
Keyword(s):  
Strike Slip ◽  
Normal Faulting ◽  
Frequency Curve ◽  
Lateral Shear ◽  
Nodal Plane ◽  
Release Pattern ◽  
Strain Release

Abstract On September 12, 1966, at 16h 41m, an earthquake of magnitude 6.0 to 6.5 occurred about 10 km northeast of Truckee, California. Hypocenters of 158 after-shocks that occurred between September 14 and 25 were found to be within a volume 3 km wide by 10 km long by 12 km deep. The magnitude-frequency curve appears anomalous, as there seem to be too many shocks greater than magnitude 2 compared to the number of small ones under magnitude 0.5. Nodal-plane determinations indicate two modes of faulting for the aftershocks. Strike-slip faulting with nodal planes striking N. 40°W. and N. 50°E. is dominant; secondary normal faulting occurs on nodal planes striking nearly north. An attempt is made to relate the strain release pattern of these aftershocks to major regional right-lateral shear and extension.

Right-lateral shear and rotation as the explanation for strike-slip faulting in eastern Tibet

Nature ◽  
1990 ◽  
Vol 344 (6262) ◽  
pp. 140-142 ◽  
Author(s):  
Philip England ◽  
Peter Molnar
Keyword(s):  
Strike Slip ◽  
Lateral Shear ◽  
Eastern Tibet

Pre-, co-, and postseismic strain changes associated with the 1952 ML = 7.2 Kern County, California, earthquake

1980 ◽  
Vol 70 (5) ◽  
pp. 1893-1905
Author(s):  
W. Scott Dunbar ◽  
David M. Boore ◽  
Wayne Thatcher
Keyword(s):  
Strain Rate ◽  
Fault Plane ◽  
Strike Slip ◽  
Dislocation Model ◽  
Time Interval ◽  
Shear Strain Rate ◽  
Lateral Shear ◽  
Lateral Strike Slip ◽  
Average Shear ◽  
Postseismic Slip

abstract Triangulation surveys carried out in the vicinity of the White Wolf Fault in 1932, 1952, 1953, and 1963 are used to delineate the strain changes preceding, accompanying, and following the 1952 earthquake. The strain rate (engineering shear) during the preseismic interval (1932 to 1952) was 0.36 ± 0.10 μstrain/yr and was nearly uniform across the 70-km-long triangulation arc, with the plane of maximum left-lateral shear oriented N44° ± 7°E, nearly parallel to the White Wolf Fault. The coseismic observations (1952 to 1953), supplemented by leveling data, are matched using a dislocation model with the following characteristics Dip = 60°SE Strike = N50°E Length = 70 km Left-Lateral Strike-Slip = 2.4 ± 0.1 meter (m) Reverse Dip-Slip = 1.9 to 0.6 m (decreasing to the NE) Seismic moment ≧ 0.9 × 1027 dyne-cm. The data also require most of the slip to have occurred below ∼5 km (5 to 20 km in our model), on roughly the southwest half of the fault, with the slip occurring at shallow depths to the northeast. The postseismic triangulation data (1953 to 1963) indicate that the average shear strain rate in the 10 yr following the earthquake (0.80 ± 0.20 μstrain/yr) was about twice that during the 20 yr preceding it. The postseismic strain changes were concentrated closer to the fault than those determined for the preseismic time interval, and the 1953 to 1963 data are explained well by episodic postseismic slip of about 2 m (left-lateral strike-slip) occurring on the down-dip extension of the coseismic fault plane.

scholarly journals Geometry, kinematics and regional significance of faulting and related lamprophyric intrusion in the mineralised zone at the Pu Sam Cap complex, Northwest Vietnam

2018 ◽  
Vol 40 (4) ◽  
pp. 320-340 ◽  
Author(s):  
Findlay R. H.
Keyword(s):  
Shear Zone ◽  
South China ◽  
Shear Zones ◽  
Planetary Science ◽  
Strike Slip ◽  
Red River ◽  
Fault System ◽  
Lateral Shear ◽  
Geological Society ◽  
Se Asia

The alkali volcanics and intrusive rocks, dated at around 35-33Ma, are cut by mineralised northeast and east trending faults showing predominant evidence for strike-slip. Mineralisation includes haematite-Au-Cu and is accompanied by iron-rich alteration of the volcanic rocks. Detailed assessment of the geometry of the fault system at Pu Sam Cap suggests that the faults formed as a Riedel shear system during left-lateral slip within the Song Hong-Song Chay shear zone and the numerous contemporaneous northwest trending faults to the south; the northeast trending faults are interpreted as dextral “book-end’’ faults between major northwest trending faults enclosing the Pu Sam Cap massif. As mineralisation is hosted within these faults and is also associated with lamprohyric dykes it confirms a thermal event younger than the alkaline volcanics and syenitic intrusives at Pu Sam Cap, suggesting a hidden, young porphyry system. The age of faulting, and thus the maximum age for this young intrusive event, is attributed to the 23-21Ma period of late-stage left-lateral strike-slip motion across northwest Vietnam.ReferencesAnczkiewicz R., Viola G., Muntener O., Thrirlwall M., Quong N.Q., 2007. Structure and shearing conditions in the Day Nui Con Voi massif: implications for the evolution of the Red River Fault. Tectonics 26: TC2002.Cao Shunyun, Liu Junlai, Leis B., Zhao Chunquiang 2010. New zircon U/Pb geochronology of the post-kinematic granitic plutons in Diancang Shan Massif along the Ailao-Shan-Red River Shear Zone and its geological implications. Acta Geologica Sinica (English Edition), 84, 1474-1487.Chung S.-L., Lee T., Lo C.,  et al., 1997. Intraplate extension prior to continental extrusion along the Ailao Shan-Red River shear zone.Geology, 25, 311-314.Cloos H., 1928. Experimentezurinnern Tektonik.  Zentralblatt fur Mineralogie und Palaeontologie, 1928, 609-621.Findlay R.H., Phan Trong Trinh 1997. The structural setting of the Song Ma region, Vietnam, and the Indochina-South China plate boundary problem. Gondwana Research, 1, 11-33.Jolivet L., Beysasac O., Goffe B., Avigad D., Leprevrier C., Maluski H., Ta Trong Thang, 2001. Oligo-Miocene midcrustal subhorizontal shear in Indochina. Tectonics, 20, 46-57.Khuong The Hung 2010. The complex tectonic events and their influence on formation of mineral deposits in northwest Vietnam. Unpublished PhD Thesis, University of Science and Technology, Cracow, 167p.Leloup P.H., N. Arnau,  R. Lacassin, J.R. Kienast, T.M. Harrison, P.T. Trinh, A. Replumaz and P. Tapponnier, 2001. New constraints on the structure, thermochronology and timing of the Ailao Shan - Red river shear zone, SE Asia, J. G. R., 106, 6657-6671.Leloup  PH.., R. Lacassin, P. Tapponnier, U. Scharer, Zhong Dalai, Liu Xaohan, Zhangshan, Ji Shaocheng and PT.Trinh, 1995. The Ailao Shan - Red river shear zone (Yunnan, China), Tertiary transform boundary of Indochina, Tectonophysics, 251, 3-84. Leprevier C., Maluski H., Nguyen Van Vuong, Roques D., Axente V., Rangin C., 1996. Indosinian NW-trending shear zones within the Truong Son belt, Vietnam: 40Ar-39Ar Triassic ages and Cretaceous to Cenozoic overprints. Tectonophysics, 283, 105-107.Lien-Sheng Zhang, Scharer U. 1999. Age and origin of magmatism along the Cenozoic Red River shear belt, China. Contributions to Mineralogy and Petrology, 134, 67-85.Nagy E.A., Scharer U., Minh N.T., 2000. Oligo-Miocene granitic magmatismin central Vietnam and implications for continental deformation in Indochina. Terra Nova, 12, 67-76.Nguyen Thi Bich Thuy, 2016. Isotop dating U-Pb Zircon of Syenit Formation, Pu Sam Cap. Journal of Geology, A Serie, 356, 30-36. (In Vietnamese).Pei-Long Wang, Ching-Hua Lo, Tung-Yi Lee, Sun-ling Chun, Ching-Yan Lan, Nguyen Trong Yem 1998. Thermochronological evidence for the movement of the Ailo Shan-Red River shear zone, a perspective from Vietnam. Geology, 26, 887-890.Phan Trong Trinh, Nguyen Trong Yem, Herve L.P., Tapponnier P., 1994. Late Cenozoic stress fields in North Vietnam from microtectonic measurements. Proceedings of the International Workshop on Seismotectonics and Seismic Hazard in Southeast Asia. Geological Survey of SR Vietnam, Hanoi, 182-186.Riedel W., 1929. Zur Mechanikgreologischer Brucherscheinungen. Zentralblatt fur Mineralogie und Palaeontologie, Abhandlung B, 354-368.Scharer U., Tapponnier P., Lacassin R., Leloup P.H., Dalai Z., Shaosheng J., 1990. Intraplate tectonics in Asia: a precise age for large-scale Miocene movement along the Ailao Shan-Red River shear zone, China. Earth  and Planetary Science Letters, 97, 65-77.Scharer U., Zhang L.S., Tapponnier P., 1994. Duration of strike-slip movements in large shear zones: the Red River belt, China. Earth and Planetary Science Letters, 126, 379-397.Searle M.P., 2006. Role of the Red River Shear zone, Yunnan and Vietnam, in the continental extrusion of SE Asia. Journal of the Geological Society, London, 163, 1025-1036.Searle M.P., Meng-Wan Yeh, Te-Hsien Lin, Sun-Lin Chung, 2010. Structural constraints on the timing of left-lateral shear along the Red River shear zone in the Ailao Shan and Diancang Shan Ranges, Yunnan, SW China. Geosphere, 6, 316-338.Tapponnier P., Lacassin R., Leloup H., Scharer U., Zhong Dalai, Wu Hawei, Liu Ziaohan, Ji Shaocheng, Zhang Lianshang, Zong Jiayou, 1990. The Ailao Shan/ Red River metamorphic belt: Tertiary left-lateral shear between Indochina and south China. Nature, 342, 431-437.Tchalenko J.S., 1970.  Similarities between shear zones of different magnitudes. Bulletin of the Geological Society of America, 81, 1625-1640.Viola G., Anczkiewicz R. 2009. Exhumation history of the Red River shear zone in northern Vietnam:  new insights from zircon and apatite fission-track analysis. Journal of Asian Earth Sciences, 33, 78-90.Yang Yiseng, Hong Qun, Hu Huan-ting, Hieu Pham Trung, Nguyen Thi Bich Thuy, Chen Fu-kun, 2013. Geochemical characteristics and genesis of the Cenozoic porphyry in the Laizhou area, northwestern Vietnam. Acta Petrologica Sinica, 29(3), 899-911. (In Chinese with English abstract, full English version through Google Translate).

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