West-directed thrusting south of the eastern Himalayan syntaxis indicates clockwise crustal flow at the indenter corner during the India-Asia collision

Haproff, Peter J.; Zuza, Andrew V.; Yin, An

doi:10.1016/j.tecto.2017.11.001

Cited by 37 publications

(55 citation statements)

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“…We interpret the absence of these major Himalayan-Tibetan units in the northern Indo-Burma Ranges to result from a greater magnitude of (1) Cenozoic shortening and erosion compared to the Himalayan orogen to the west and/or (2) continental underthrusting. Haproff et al (2018) showed that the south-to west-directed northern Indo-Burma thrust belt accommodated clockwise rotation of Himalayan-Tibetan rocks around the eastern Himalayan syntaxis. Progressive clockwise rotation of the thrust belt from an originally east-trending configuration implies a spatial gradient in shortening strain, such that the magnitude of crustal shortening increases with distance from the pole of rotation at the eastern Himalayan syntaxis.…”

Section: ■ Discussionmentioning

confidence: 99%

“…Previous geological studies have established the first-order lithologic framework of the northern Indo-Burma Ranges (e.g., Wadia, 1931;Nandy, 1973;Thakur and Jain, 1975;Acharyya, 1980Acharyya, , 1987Sharma et al, 1991;Singh, 1993;Misra and Singh, 2002;Gururajan and Choudhuri, 2003;Goswami, 2008Goswami, , 2011Misra, 2009;Sarma et al, 2009;Sarma et al, 2012;Goswami, 2013aGoswami, , 2013bSharma and Sarma, 2013;Ningthoujam et al, 2015). Most recently, Haproff et al (2018) divided the exposed rocks into six lithologic units , which from northeast to southwest consist of: (1) igneous rocks of the Lohit Plutonic Complex (Fig. 6); (2) the Tidding mélange complex (Fig.…”

Section: Northern Indo-burma Rangesmentioning

confidence: 99%

“…This study builds upon the work of Haproff et al (2018), which described the structural framework of the northern Indo-Burma Ranges with a focus on the kinematics of major faults. Here we focus on the lithologies, geochemical compositions, and geochronologic ages of the thrust-bounded lithologic units and investigate how they correlate with those of the Himalayan orogen and the Lhasa terrane to the west (Fig.…”

Section: Northern Indo-burma Rangesmentioning

confidence: 99%

“…Although the geology and tectonic evolution of the Himalayan orogen are well documented (Le Fort, 1975;Le Fort, 1996;DeCelles et al, 2000DeCelles et al, , 2001Hodges, 2000;Yin and Harrison, 2000;Yin, 2006Yin, , 2010Webb et al, 2013Webb et al, , 2017, relatively few geologic studies have focused on the flanking belts (cf. Tapponnier et al, 1981;Ni et al, 1989;Mitchell, 1993;Haq and Davis, 1997;Haproff et al, 2018). Establishing the geologic history of the two flanking belts is crucial for understanding the holistic development of the Himalayan collisional system and differentiating the end-member models of continental deformation during the India-Asia collision (e.g., Tapponnier et al, 1982Tapponnier et al, , 2001England and Houseman, 1986;Cobbold and Davy, 1988;Dewey et al, 1988;England and Molnar, 1990;Royden et al, 1997;Zuza et al, 2019).…”

Section: ■ Introductionmentioning

confidence: 99%

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Geologic framework of the northern Indo-Burma Ranges and lateral correlation of Himalayan-Tibetan lithologic units across the eastern Himalayan syntaxis

et al. 2019

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The Cenozoic India-Asia collision generated both the east-trending Himalayan orogen and the north-trending Eastern and Western Flanking Belts located along the margins of the Indian subcontinent. Although the tectonic development of both flanking belts is key to understanding mechanisms of continental deformation during indenter-induced collision, few field-based studies coupled with geochronological and geochemical methods have been applied to these tectonic domains. In this study, we investigate the lateral correlation of lithologic units between the northern Indo-Burma Ranges, the northernmost segment of the Eastern Flanking Belt, and the eastern Himalayan-Tibetan orogen by integrating field observations, U-Pb zircon geochronology, and whole-rock geochemistry. Our findings provide new quantitative constraints to interpretations that the northern Indo-Burma Ranges expose the eastward continuation of several lithologic units of the Himalayan orogen and Lhasa terrane. Our field work documents a stack of thrust-bounded lithologic units present in the study area. The northernmost and structurally highest Lohit Plutonic Complex consists of Mesoproterozoic basement rocks (ca. 1286 Ma) and Late Jurassic-Cretaceous granitoids (ca. 156-69 Ma) with positive ε Nd values and initial 87 Sr/ 86 Sr ratios of ~0.705, which are correlative to the Bomi-Chayu complex and the northern Gangdese batholith, respectively. The structurally lower Tidding-Mayodia mélange complex, composed of basalt, gabbro, ultramafic rocks, and mafic schist of a dismembered ophiolite sequence, is interpreted in this study as the eastward extension of the Indus-Yarlung suture zone. Structurally below the suture zone are the Mayodia gneiss and Lalpani schist, which are interpreted to correlate with the Lesser Himalayan Sequence based on comparable metamorphic lithologies, negative ε Nd values, and similar Mesoproterozoic-Cambrian detrital zircon age spectra. In contrast to the above metamorphic units, the structurally lowest Tezu unit consists of siliciclastic strata that may be correlated with the Miocene-Pliocene Siwalik Group of the Himalayan orogen. Despite the above correlations, notable Himalayan-Tibetan lithologic units are absent in the northern Indo-Burma Ranges, including the Mesozoic-Cenozoic southern Gangdese batholith belt and its cover sequence of the Linzizong volcanic rocks, Xigaze forearc basin, Tethyan Himalayan Sequence, and Greater Himalayan Crystalline Complex of south-central Tibet and the central Himalaya. We interpret the absence of these lithologic units to be a result of a greater magnitude of crustal shortening and/or underthrusting of the Indian cratonal rocks than that across the Himalayan orogen to the west. This interpretation is supported by a southward decrease in the map-view distance between the active range-bounding thrust and the Indus-Yarlung suture zone in the northern Indo-Burma Ranges, from ~200 km in the north near the eastern Himalayan syntaxis to ~5 km in the south across a distance of ~200-300 km.

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Section: ■ Discussionmentioning

confidence: 99%

Section: Northern Indo-burma Rangesmentioning

confidence: 99%

Section: Northern Indo-burma Rangesmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Geologic framework of the northern Indo-Burma Ranges and lateral correlation of Himalayan-Tibetan lithologic units across the eastern Himalayan syntaxis

et al. 2019

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“…Любое отклонение от прямоли нейности приводит к изменению , а значит отра жается на величине продольных напряжений. Та ким образом, непосредственное измерение радиуса упругого или упруго пластического изгиба , на пример, в процессе проведения ВТД, позволяет вы явить ПОУ и получить первичную оценку их НДС по формуле (2). Такой метод, реализованный пу тем анализа деформации конструкции (в нашем случае трубопровода), можно считать прямым спо собом измерения НДС [18].…”

Section: методика выявления потенциально опасных участков магистральнunclassified

О Технологии Выявления Участков Трубопроводов С Изгибными Напряжениями При Пересечении Ими Геодинамических Зон

Аскаров¹,

Kitaev²,

Islamov³

2019

IZVESTIYA

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Актуальность. Внутри Земли происходят термоядерные реакции, вызывающие перемещение земной поверхности. В областях сдвига тектонических плит – геодинамических зонах – происходит изменение положения подземных магистральных трубопроводов. В свою очередь изменение положения магистрального трубопровода приводит к изменению его напряженно-деформированного состояния. После активации разломов начинается движение блоков. Вначале они движутся медленно, затем темп движения возрастает, при этом в зону риска попадают трубопроводы, находящиеся в условиях длительной эксплуатации, поэтому вопрос контроля напряженно-деформированного состояния трубопроводов на пересечениях с геодинамическими зонами является актуальным. Цель: разработать и внедрить технологию выявления участков трубопроводов при их пересечении с геодинамическими зонами, предусматривающую определение потенциально опасных участков, оценку напряженно-деформированного состояния трубы. Объекты: области прохождения магистральных трубопроводов по территории Республики Башкортостан на пересечениях с геодинамическими зонами. Методы: анализ результатов внутритрубной дефектоскопии с измерением радиусов изгиба трубопроводов, выявление потенциально-опасных участков, аналитический расчет напряженно-деформированного состояния трубопроводов. Результаты. Изложена технология выявления участков трубопроводов с изгибными напряжениями при их пересечении с геодинамическими зонами. Технология предусматривает определение фактического положения магистрального трубопровода, непосредственное измерение радиуса изгиба. Располагая данными по участкам трубопроводов с ненормативными радиусами изгиба 500D и менее из отчетов по внутритрубной дефектоскопии, предлагается выявлять потенциально опасные участки, а повторный пропуск внутритрубных дефектоскопов каждые 2–3 года позволит оценивать динамику изменения радиусов изгиба, а также выявлять активные геодинамические зоны.

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Recent felt earthquakes (Mw 5.0–5.9) in Mizoram of north‐east India region: Seismotectonics and precursor appraisal

Hazarika

Kayal

2021

Geological Journal

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Eight medium magnitude (Mw 5.0-5.9) severely felt earthquakes, mostly at a shallower depth (<35 km), occurred in a short period of 7 months only, April-October, 2020, in Mizoram State, north-east region (NER) of India, and it created much panic in the state. The increasing population growth as well as rapid urbanization in Aizawl, the capital city of Mizoram, may be under severe threat for an impending large earthquake in the region. The NER, India, is jawed between two arcs, the Himalayan Arc collision zone to the north and the Indo-Burma (Myanmar) Arc subduction zone to the east, and witnessed two great earthquakes (Mw ≥ 8.0, 1897 and 1950) and a total of 25 large earthquakes (Mw ≥ 7.0) in the past since 1869. The 2020 sudden burst of seismic activity in Mizoram, along with a strong (Mw 6.7) earthquake in Manipur in 2016 and a medium magnitude (Mw 5.7) earthquake in 2017 in Tripura, adjacent to the Mizoram State, are critically examined to understand the ongoing seismotectonics and the precursor implications, if any. The 2016 Manipur earthquake is interpreted to be an intra-plate earthquake triggered by the transverse Kopili Fault by strike-slip motion. The 2017 Tripura earthquake is also interpreted to be typically an intra-plate strike-slip event in the eastern margin of the Bengal Basin. The seismic activity in Mizoram, on the other hand, is found to have occurred in the accretionary Indo-Burma Wedge, between the Churachandpur Mao Fault and Eastern Boundary Thrust. The centroid moment tensor solutions of the events suggest the dextral-slip motion of the wedge along the Indo-Burma Arc.A preliminary analysis of the Mizoram seismicity recognizes a precursor anomaly, a temporal variation of much higher seismic activity, for an impending large earthquake in the study area.

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West-directed thrusting south of the eastern Himalayan syntaxis indicates clockwise crustal flow at the indenter corner during the India-Asia collision

Cited by 37 publications

References 40 publications

Geologic framework of the northern Indo-Burma Ranges and lateral correlation of Himalayan-Tibetan lithologic units across the eastern Himalayan syntaxis

Geologic framework of the northern Indo-Burma Ranges and lateral correlation of Himalayan-Tibetan lithologic units across the eastern Himalayan syntaxis

О Технологии Выявления Участков Трубопроводов С Изгибными Напряжениями При Пересечении Ими Геодинамических Зон

Recent felt earthquakes (Mw 5.0–5.9) in Mizoram of north‐east India region: Seismotectonics and precursor appraisal

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