scholarly journals Reconstructing the Greater Indian margin: A balanced cross section in central Nepal focusing on the Lesser Himalayan duplex

Tectonics ◽  
2014 ◽  
Vol 33 (11) ◽  
pp. 2143-2168 ◽  
Author(s):  
Delores M. Robinson ◽  
Aaron J. Martin
Keyword(s):  
Cross Section ◽  
Central Nepal ◽  
Balanced Cross Section

scholarly journals Controls on timing of exhumation and deformation in the northern Peruvian eastern Andean wedge as inferred from low-temperature thermochronology and balanced cross section

Tectonics ◽  
2015 ◽  
Vol 34 (4) ◽  
pp. 715-730 ◽  
Author(s):  
Adrien Eude ◽  
Martin Roddaz ◽  
Stéphanie Brichau ◽  
Stéphane Brusset ◽  
Ysabel Calderon ◽  
...  
Keyword(s):  
Low Temperature ◽  
Cross Section ◽  
Balanced Cross Section

scholarly journals Examining the tectono-stratigraphic architecture, structural geometry, and kinematic evolution of the Himalayan fold-thrust belt, Kumaun, northwest India

Lithosphere ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 414-435 ◽  
Author(s):  
Subhadip Mandal ◽  
Delores M. Robinson ◽  
Matthew J. Kohn ◽  
Subodha Khanal ◽  
Oindrila Das
Keyword(s):  
Cross Section ◽  
Structural Model ◽  
Kinematic Model ◽  
Thrust Belt ◽  
Main Central Thrust ◽  
Thrust Sheet ◽  
Balanced Cross Section ◽  
Kinematic Evolution ◽  
Thrust Sheets ◽  
Northwest India

Abstract Existing structural models of the Himalayan fold-thrust belt in Kumaun, northwest India, are based on a tectono-stratigraphy that assigns different stratigraphy to the Ramgarh, Berinag, Askot, and Munsiari thrusts and treats the thrusts as separate structures. We reassess the tectono-stratigraphy of Kumaun, based on new and existing U-Pb zircon ages and whole-rock Nd isotopic values, and present a new structural model and deformation history through kinematic analysis using a balanced cross section. This study reveals that the rocks that currently crop out as the Ramgarh, Berinag, Askot, and Munsiari thrust sheets were part of the same, once laterally continuous stratigraphic unit, consisting of Lesser Himalayan Paleoproterozoic granitoids (ca. 1850 Ma) and metasedimentary rocks. These Paleoproterozoic rocks were shortened and duplexed into the Ramgarh-Munsiari thrust sheet and other Paleoproterozoic thrust sheets during Himalayan orogenesis. Our structural model contains a hinterland-dipping duplex that accommodates ∼541–575 km or 79%–80% of minimum shortening between the Main Frontal thrust and South Tibetan Detachment system. By adding in minimum shortening from the Tethyan Himalaya, we estimate a total minimum shortening of ∼674–751 km in the Himalayan fold-thrust belt. The Ramgarh-Munsiari thrust sheet and the Lesser Himalayan duplex are breached by erosion, separating the Paleoproterozoic Lesser Himalayan rocks of the Ramgarh-Munsiari thrust into the isolated, synclinal Almora, Askot, and Chiplakot klippen, where folding of the Ramgarh-Munsiari thrust sheet by the Lesser Himalayan duplex controls preservation of these klippen. The Ramgarh-Munsiari thrust carries the Paleoproterozoic Lesser Himalayan rocks ∼120 km southward from the footwall of the Main Central thrust and exposed them in the hanging wall of the Main Boundary thrust. Our kinematic model demonstrates that propagation of the thrust belt occurred from north to south with minor out-of-sequence thrusting and is consistent with a critical taper model for growth of the Himalayan thrust belt, following emplacement of midcrustal Greater Himalayan rocks. Our revised stratigraphy-based balanced cross section contains ∼120–200 km greater shortening than previously estimated through the Greater, Lesser, and Subhimalayan rocks.

scholarly journals The geological framework for Hvideklint, south-east Denmark, using glaciodynamic sequence stratigraphy

2021 ◽  
Vol 47 ◽  
Author(s):  
Stig A. Schack Pedersen ◽  
Peter Gravesen
Keyword(s):  
Sea Level ◽  
Sequence Stratigraphy ◽  
Cross Section ◽  
Cross Sections ◽  
Drill Hole ◽  
Balanced Cross Section ◽  
Geological Cross Section ◽  
Thrust Sheets ◽  
Practical Model ◽  
Complex Architecture

Glaciodynamic sequence stratigraphy provides a practical model for grouping and classifying complex geological data to aid interpretation of past climatic and environmental development in Quaternary successions. The principles of glaciodynamic sequence stratigraphy are applied here to summarise the complex glacial geological framework of Hvideklint on the island of Møn, south-east Denmark. The framework of the superimposed deformed Hvideklint is presented in a reconstructed geological cross-section of Hvideklint. For the construction of the architecture of the glaciotectonic complex, the interpretation of structures below sea level was based on a detailed new survey of the cliff section combined with construction of successive approximation balanced cross-sections. The new description is supported by drill hole data from the Jupiter database. Where chalk is not glaciotectonically deformed, the constructed depth to the top-chalk-surface is generally located about 30 m below sea level. In Hvideklint, thrust sheets with chalk are exposed 20 m above sea level, and the balanced cross-section constructions indicate that the décollement surface for a Hvideklint glaciotectonic complex is located about 80 m below sea level. Between the décollement level and the top of the complex, two or more thrust-fault flat-levels and connecting ramps add to the complex architecture of Hvideklint.

Balanced cross-section across the Siwaliks of the Trijuga Valley, eastern Nepal

2020 ◽  
Vol 60 ◽  
pp. 51-58
Author(s):  
Ravi Acharya ◽  
Saurav Khanal ◽  
Surya Prasad Kandel ◽  
Rabin Dhakal ◽  
Rafel Almeida ◽  
...  
Keyword(s):  
Cross Section ◽  
Total Thickness ◽  
Balanced Cross Section ◽  
Main Boundary Thrust ◽  
Fault Bend ◽  
Siwalik Group

The strata of the Siwalik Group in the Trijuga valley is dissected by two thrusts, repeating the succession three times and forming a longitudinal Dun Valley. The total thickness of the Siwalik strata exceeds 5000 m in the area. A balanced cross-section has been constructed across the Siwalik Range in the Trijuga valley showing that the Main Himalayan Thrust (MHT) lies at the depth of about 5.2 km from the surface. The Main Frontal Thrust (MFT), Kamala Tawa Thrust (KTT), Marine ­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­Khola Thrust (MKT) and Main Boundary Thrust (MBT) ramp-up from the MHT. Along with these faults, fault-bend anticlines associated with these thrusts have shortened the Siwalik of the area. The shortening across the area has been calculated to be approximately 33.7 km.

Application of Balanced Cross Section on the Basin Analysis for Cenozoic of Huanghua Depression

2012 ◽  
Vol 518-523 ◽  
pp. 5636-5639
Author(s):  
Min Dong ◽  
Jia Fu Qi ◽  
Hui Dong ◽  
Hong Li ◽  
Xiao Long Chen
Keyword(s):  
Cross Section ◽  
Tectonic Evolution ◽  
Vertical Structure ◽  
Central Area ◽  
Tectonic Deformation ◽  
Seismic Profiles ◽  
Two Phase ◽  
The Third ◽  
Balanced Cross Section ◽  
Huanghua Depression

In this paper, the seismic profiles of the central area of Huanghua depression were balanced and restored by 2DMove software. We calculated the extension parameters of the balanced corss-section in the different period, analyzed the tectonic deformation of Huanghua depression. According to the total extension parameters of balanced cross-section, the Cenozoic evolution of the Huanghua depression may be divided into two phase of tectonic evolution which are rifting stage and post-rift stage. The rifting stage included three episodic rifting: The third members of Shehejie with the rapidest subsidence,Ⅰepisodic rifting; The first and second members of Shahejie with the fault-depression,Ⅱepisodic rifting; The Dongying with terminal fault-depressed ,Ⅲepisodic rifting . The Huanghua depression shows a double-layer vertical structure with faulting structures in the lower and depressing structure in the upper sector.

Sign in / Sign up

Export Citation Format

Share Document