I= BELA OPHIOLITES AND ASSOCIATED MINERALIZATION IN SOUTHERN PART OF AXAL BELT OF PAKISTAN
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Title of Thesis
BELA OPHIOLITES AND ASSOCIATED MINERALIZATION IN SOUTHERN PART OF AXAL BELT OF PAKISTAN

Author(s)
Mayyer Alam Zaigham
Institute/University/Department Details
University of Karachi/ Department of Geology
Session
1991
Subject
Geology
Number of Pages
370
Keywords (Extracted from title, table of contents and abstract of thesis)
bela ophiolites, baloachistan, bela-makran, gravity field data, tectonics, crustal features, geophysical investigations

Abstract
An integrated geophysical and the geological investigations for the Bela Ophiolites of Southern Axial-belt of Baloachistan, have been carried out to evaluate the tectonic phases and the mineral potentials associated with the ophiolites. The subsurface extension of the Bela Ophiolites was detected in the west upto the half of the eastern Bela Plain. Likewise, the southern continuation of the Bela Ophiolites was also observed to continue towards submarine Murray Ridge of the Arabian sea. The gravity models supplemented with magnetic and seismicity data, have been proposed to illustrate the subduction of Bela-Makran micro-oceanic plate under the irregularly rifted western margin of the Indo-Pakistan continental plate. The on-going nature of the deformation tectonics in the region, has also been discussed. The presence of fossil Failed-Rift crustal feature exhibiting prominent subsurface ‘horst and graben’ structures, the origin of southern Indus Basin and the reactivation of transcurrent faults, the think-skin deformation along with western part of Indus Basin and the Southern Axial-belt, have analyzed and evaluated. The inferred NE-SW trending Nal-Jabbri Tanscurrent Zone appears to play an important role in segmenting the Neo-Tethyan makran oceanic plate and in diverting the movement of one of the segments towards east.

The models, generated after the analyses of integrated geophysical investigations and geological studies, illustrate the possible mode of origin of mineral deposits associated with Bela Ophiolites. Good prospects for metallic and non-metallic mineral deposits are expected in Bela Ophiolite Zone and the associated rocks of Jurassic age. The possibilities of new larger discoveries of oil and gas occurrences, particularly in Indus and Hingol Basins, are also expected to be quite high. Table of Contents

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4040.45 KB
S. No. Chapter Title of the Chapters Page Size (KB)
1 0 Contents
134.44 KB
2 1 Introduction 1
134.03 KB
  1.1 General Statement 1
  1.2 Purpose of Study 5
  1.3 Previous Work 8
  1.4 Methods of Present Study 10
3 2 Geological Setting of the Area 17
264.69 KB
  2.1 Stratigraphy 17
  2.2 Tectonic Setting 40
4 3 Gravity Anomalies Associated With Bela Ophiolite Complex 44
975.01 KB
  3.1 Collection of Gravity Field Data 45
  3.2 Reduction of Gravity Field Data 48
  3.3 Analysis of Gravity Field Data 51
  3.4 Comparison of Gravity Anomalies of Bela Ophiolites with Other Important Ophiolites of the World 102
  3.5 Gravity Modeling for Subduction Tectonics of Bela Region 107
  3.6 Analysis of Isostatic Balance of the Earth Crust in Bela Region 115
5 4 Magnetic Anomalies of the Bela Ophiolites and Associated Structures 118
707.19 KB
  4.1 Analyses of Aeromagnetic Data of High Density Measurements 119
  4.2 Preparation of Interpreted Geologic Map 135
  4.3 Regional Aeromagnetic 151
6 5 Seismicity of Bela Ophiolite Zone and Its Surroundings 165
144.98 KB
  5.1 Distribution of Lithological Units and the Epicenters 167
  5.2 Surface Structural Features and the Epicenters 169
  5.3 Inferred Crustal Features and the Epicenters 172
7 6 Tectonic Models of Bela Ophiolites and the Associated Crustal Features 175
1042.35 KB
  6.1 Summery of Views on Tectonic Processes in Pakistan 177
  6.2 Proposed Geophysical Models for Bela Ophiolites and Associated Structures 189
  6.3 Bela Ophiolites in Relation to Exotic Features of the Region 228
8 7 Tectonic Events and Mineralizations Associated with Bela Ophiolite Complex 255
397.06 KB
  7.1 History of Geologic Events 259
  7.2 Mineralizations Associated with the Bela Ophiolites and their Tectonic Significance 268
9 8 Discussion 287
87.08 KB
10 9 Conclusions 298
58.22 KB
11 10 Recommendations for Future Research Problems 306
24.63 KB
12 11 Bibliogrphy 309
222.38 KB
13 12 Appendices 331
397.08 KB