Magnetic Susceptibility as a Tool of Lithological Mapping: A Case Study from Malekhu-Damauli Area of Central Nepal, Lesser Himalaya

Magnetic susceptibility (MS) along different roads, foot-trails and river sections has been measured in rock outcrops. The measured major sections are Malekhu-Dhading road, Mugling-Jugedi road, Ghumaune-Damauli road, Mugling-Anbu Khaireni-Badinpur road, Shivapur- Gwaslung road, Malekhu Khola section, Trishuli and Seti river sections and other small tributaries near road sections. A pocket susceptibility meter (ZH Instruments SM30) was used to measure MS values of rocks which belong to the Nawakot Group, Bhimphedi Group and the Tanahun Group. For the values of MS in the study area, site mean MS (average of 10 to 15 readings at each outcrop) data gave the following variations: (i) a large range of average MS between (-0.0097 - 387) x 10-3 SI; (ii) lowest MS magnitudes (<0.1 x 10-3 SI ) for quartzite, limestone, dolomite, which are predominantly composed of diamagnetic minerals (e.g. quartz, calcite and dolomite); (iii) intermediate range of (0.1-1.0 x 10-3 SI) was found in most shales, slates, phyllites, sandstones and schists; and (iv) high values (>1.0 x 10-3 SI) for amphibolites, green-schists, metasandstones, and iron rich beds. The range of unique values of MS could be used for lithological mapping and hence the stratigraphic as well as structural interpretations.Nepal Journal of Science and Technology Vol. 16, No.1 (2015) pp.49-58

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Characteristics and field relation of Ulleri Augen Gneiss to country rocks in the Lesser Himalaya: A case study from Syaprubesi-Chhyamthali area, central Nepal

Journal of Nepal Geological Society ◽

10.3126/jngs.v58i0.24577 ◽

2019 ◽

Vol 58 ◽

pp. 89-96

Author(s):

Jharendra K.C. ◽

Kabi Raj Paudyal

Keyword(s):

Geological Mapping ◽

Lesser Himalaya ◽

Main Central Thrust ◽

Nepal Himalaya ◽

Field Relation ◽

Central Nepal ◽

Thrust Zone ◽

Augen Gneiss ◽

Host Rocks

The distribution of Ulleri Augen Gneiss and its origin in the Lesser Nepal Himalaya adjacent to the Main Central Thrust zone is stilla debate among the geo-scientists. Geological mapping was carried out along the Syaprubesi-Chhyamthali area of central Nepal with the aim to study the field relation, distribution, deformation and metamorphism of the Ulleri Augen Gneiss. During mapping, close traverses were set to observe the field relation and a number of systematic samples were collected for analysis of composition and texture. Some preliminary findings were obtained related to its geological position and distribution. This gneiss is hosted within the Kuncha Formation, the oldest unit of the Nawakot Group in the Lesser Himalaya. It has been evolved within this unit as a tabular form in some places and lenses in other places. It shows both concordant (i.e., sill type) and discordant (i.e., dike type) relationship with the host rock. It is characterized by augen-shaped porphyroblasts of K-feldspar and S-C mylonitic texture showing top to the SW sense of shear. The S-C structures and lineated textures shown by the minerals are associated with the shearing caused by the movement along the MCT during the syn-MCT metamorphic deformation. It is characterized in different types of lithologies such as augen gneiss, banded gneiss and two-mica gneiss. An attempt is made to explain the petrological characteristics and field relation of the Ulleri Augen Gneiss with the host rocks along with structural aspects. Based on the field relation and texture analysis, the evolution of the protolith of this Ulleri Augun Gneiss can be interpreted as a multi-story emplacement within the host rocks during and immediately after the sedimentation.

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K-Ar Dating of White Mica from the Lesser Himalaya, Tansen-Pokhara Section, Central Nepal: Implications for the Timing of Metamorphism

Nepal Journal of Science and Technology ◽

10.3126/njst.v12i0.6509 ◽

2012 ◽

Vol 12 ◽

pp. 242-251 ◽

Cited By ~ 1

Author(s):

Lalu P Paudel

Keyword(s):

Late Miocene ◽

Science And Technology ◽

White Mica ◽

Early Paleozoic ◽

Lesser Himalaya ◽

Metasedimentary Rocks ◽

The North ◽

Central Nepal ◽

Exact Timing

The Lesser Himalaya in central Nepal comprises low- to medium-grade metasedimentary rocks. Metamorphic studies show that they have experienced at least two metamorphic events (M1 and M2). However, exact timing of metamorphism is still controversial. In the present study K-Ar dating of white micas in shales, slates, phyllites, schists and gneisses from the Tansen-Pokhara section was carried out to understand the timing of metamorphism. The muscovite in gneiss from the MCT zone shows an age of about 1255 Ma representing the age of crystallization of parent granite. Detrital mica from the Bhainskati Formation gives an age of about 2441 Ma. Probably this is the age of crystallization of muscovite in its provenance. The recrystallized white micas from slate and phyllite show older ages (Early Paleozoic) in the southern part (279 to 458 Ma). Most probably this represents the timing of M1. Age become gradually younger towards the north due to the mixing of older (M1 related) and younger (M2 related) white micas. Youngest age (10 Ma) was measured from the sample just below the Upper MCT. This age may be related to the M2 which was due to the Late Miocene-Pleistocene reactivation of the Upper MCT.DOI: http://dx.doi.org/10.3126/njst.v12i0.6509 Nepal Journal of Science and Technology 12 (2011) 242-251

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Anisotropy of Magnetic Susceptibility in the Almora Crystalline Zone Lesser Himalaya, India: A Case Study

Asian Journal of Earth Sciences ◽

10.3923/ajes.2010.1.10 ◽

2009 ◽

Vol 3 (1) ◽

pp. 1-10 ◽

Cited By ~ 2

Author(s):

K.K. Agarwal ◽

R. Bali ◽

S.K. Patil ◽

S. Nawaz Ali

Keyword(s):

Magnetic Susceptibility ◽

Anisotropy Of Magnetic Susceptibility ◽

Lesser Himalaya

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Evaluating The Effectiveness Of Problem-Based Learning (Pbl) Implemented In The Textile Engineering Course - A Case Study On Ahsanullah University Of Science And Technology, Bangladesh

Balkan Region Conference on Engineering and Business Education ◽

10.2478/cplbu-2014-0024 ◽

2014 ◽

Vol 1 (1) ◽

pp. 111-114

Author(s):

Lal Mohan Baral ◽

Ramzan Muhammad ◽

Claudiu Vasile Kifor ◽

Ioan Bondrea

Keyword(s):

Engineering Students ◽

Science And Technology ◽

Problem Based Learning ◽

Professional Life ◽

System Level ◽

Teaching Tool ◽

Technical Problems ◽

Empirical Survey ◽

Undergraduate Programs

AbstractProblem-based learning as a teaching tool is now used globally in many areas of higher education. It provides an opportunity for students to explore technical problems from a system-level perspective and to be self-directed life-long learner which is mandatory for equipping engineering students with the skill and knowledge. This paper presents a case study illustrating the effectiveness of implemented Problem-based learning (PBL) during five semesters in the undergraduate programs of Textile Engineering in Ahsanullah University of Science and Technology (AUST). An assessment has been done on the basis of feedback from the students as well as their employers by conducting an empirical survey for the evaluation of PBL impact to enhance the student's competencies. The Evaluations indicate that students have achieved remarkable competencies through PBL practices which helped them to be competent in their professional life.

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