I= CRUSTAL EVOLUTION OF CHAGAI – RASKOH ARC TERRANE, BALOCHISTAN, PAKISTAN.
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Title of Thesis
CRUSTAL EVOLUTION OF CHAGAI – RASKOH ARC TERRANE, BALOCHISTAN, PAKISTAN.

Author(s)
Muhammad Rehan Ul-Haq Siddiqui.
Institute/University/Department Details
University Of Peshawar/ National Centre Of Excellence In Geology
Session
2004
Subject
Geology.
Number of Pages
353
Keywords (Extracted from title, table of contents and abstract of thesis)
chagai-raskoh, petrochemical studies, karakoram block, arabian plate, volcanics, paleocene volcanics, eocene volcanics, oligocene volcanics, miocene volcanics, plio-pleistocene volcanics

Abstract
The Chagai-Raskoh arc terrane occurs in the western part of Pakistan. In the regional geotectonic scenario this arc terrance belongs to an ancient Tethan convergence zone. Which was initiated probably during Early Jurassic, due to an intra-oceanic convergence in the Ceno Tethys. The are terrane exhibits spectacular field exposures of interstraified volcanic and sedimentary rocks, intruded by large plutons. The sedimentary rock formations from the late Early Jurassic to Recent arc well preserved, which represent excellent manifestations of sedimentary evolution from late Early Jurassic pelagic sedimens, through diversified varieties of Cretaceous to Oligocene shallow marine limestone, shale and sandstone deposits and Miocene onwards terrestrial sediments. The sedimentation in the arc terrane is interrupted by several episodes of magmatism that occurred during Cretaceous to quaternary. The Cretaceous and Paleocene volcanism is dominated by vbasaltic-andesites with minor basalts and andesites with their volcaniclastic counterparts, whereas Eocene onwards volcanism is generally dominated by andesites with minor dacites and their volcaniclastic equivalents. The mafic mineralogy (augite-biotite), anorthite contents (An68-15) and phenocrysts to groundmass ratios (20:80-45:55) in the volcanics rocks generally show progressive evolution towards younger volcanics.

Download Full Thesis
30698.3 KB
S. No. Chapter Title of the Chapters Page Size (KB)
1 0 Contents
16503.75 KB
2 1 Introduction
1138.16 KB
  1.1 Statement of the Problem 1
  1.2 Previous Work 3
  1.3 Geology 3
  1.4 Objectives 4
  1.5 Methodology 5
  1.6 Laboratory Techniques 5
3 2 Regional Tectonics
287.21 KB
  2.1 Introduction 8
  2.2 The Chagai-Raskoh Arc Terrane 11
  2.3 Kohistan-Ladakh Arc Terrane 16
  2.4 Zagros Orogen and Zagros Arc 16
  2.5 Kandhar Arc 17
  2.6 Arabian Plate 18
  2.7 Central Iran Block 19
  2.8 Central Afghan Block 20
  2.9 Karakoram Block 21
  2.10 Brief Comparison of Rock Units in Each Block 22
4 3 Stratigraphy, Sedimentary Environments and Paleogeography
4210.45 KB
  3.1 Stratigraphy and paleosedimentary Environments in the Raskoh Arc 25
  3.2 Stratigraphy and Paleosedimentary Environments in the Chagai Arc 59
  3.3 Paleogeography of Chagai-Raskoh Arc Terrane 85
5 4 Magmatism in The Chagai-Raskoh Arc Terrane
2665.49 KB
  4.1 Volcanism in the Chagai Arc 88
  4.2 Plutonism and Major Plutonic Phases in the Chagai Arc 88
  4.3 Volcanism in the Raskoh Arc 96
  4.4 Plutonism and Major Plutonic Phases in the Raskoh Arc 105
6 5 Late Cretaceous Volcanics of The Raskoh Arc
844.9 KB
  5.1 Introduction 133
  5.2 Field Aspects 133
  5.3 Petrography 135
  5.4 Geochemistry 141
  5.5 Petrogenesis 151
  5.6 Conclusion 158
7 6 Late Cretaceous Volcanics of the Chagai Arc
973.14 KB
  6.1 ntroduction 159
  6.2 Field Aspects 159
  6.3 Petrography 161
  6.4 Geochemistry 167
  6.5 Petrogenesis 179
  6.6 Comparison of Chagai and Raskoh Arcs 188
  6.7 Conclusion 193
8 7 Paleocene Volcanics of The Chagai Arc
842.16 KB
  7.1 Introduction 195
  7.2 Field Aspects 195
  7.3 Petrography 197
  7.4 Geochemistry 202
  7.5 Petrogenesis 212
  7.6 Conclusion 219
9 8 Eocene Volcanics of The Chagai Arc
665.44 KB
  8.1 Introduction 220
  8.2 Field Aspects 220
  8.3 Petrography 222
  8.4 Geochemistry 227
  8.5 Petrogenesis 236
  8.6 Conclusion 243
10 9 Oligocene Volcanics of The Chagai Arc
355.74 KB
  9.1 Introduction 244
  9.2 Field Aspects 244
  9.3 Petrography 247
  9.4 Geochemistry 247
  9.5 Petrogenesis 256
  9.6 Conclusion 261
11 10 Miocene Volcanics of The Ghagai Arc
879.95 KB
  10.1 Introduction 262
  10.2 Field Aspects 262
  10.3 Petrography 264
  10.4 Geochemistry 270
  10.5 Petrogenesis 282
  10.6 Conclusion 287
12 11 Plio-Pleistocene Volcanics of The Chagai Arc
1329.49 KB
  11.1 Introduction 289
  11.2 Field Aspects 289
  11.3 Petrography 291
  11.4 Geochemistry 305
  11.5 Petrogenesis 316
  11.6 Conclusion 320
13 12 Summary and Conclusion
452.23 KB
  12.1 General Discussion 322
  12.2 Sedimentary 322
  12.3 Volcanic Evolution 326
  12.4 Crustal Evolution 332
  12.5 Conclusion 340
  12.6 References 344