Paleozoic Geodynamics and Gold Deposits in the Kyrgyz Tien Shan
Excursion Guidebook

IGCP-373 Field Conference in Bishkek and the Kyrgyz Tien Shan: 16-25 August 2001

Ed.: Reimar Seltmann; R. Jenchuraeva

2001. 179 pages, 81 figures, 44 tables, 21x30cm, 590 g
Language: English

ISBN 978-3-510-65403-1, paperback, price: 40.00 €

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Synopsis top ↑

The IGCP-Project #373 on “Correlation, Anatomy and Magmatic-Hydrothermal Evolution of Ore-Bearing Felsic Igneous Systems in Eurasia”, supported through IUGS-UNESCO and IGCP for the period 1997-2001, was invited for its 5th annual field conference 2001 to Bishkek, Kyrgyzstan. Previous IGCP-373 field campaigns have studied the relationship of geodynamic evolution, magmatism and mineralization in the adjacent parts of the Altaids orogenic collage, i.e. Central and Southern Kazakhstan (Bekzhanov et al., 1997), the South and Central Tien Shan of Uzbekistan (Shayakubov et al., 1999), the Southern Urals of Russia (Seltmann et al., 2000). As a consequence, studies of the Kyrgyz Tien Shan are important in understanding the Central Asian gold belt as forming the southern part of the Altaids.
During the period 16-25 August 2001 about 50 project participants of IGCP-373 from 18 countries met in the Kyrgyz Tien Shan to carry out joint field work and to examine a number of world-class gold deposits in their geological framework. The topic of the meeting “Paleozoic geodynamics and gold deposits in the Kyrgyz Tien Shan ” included a conference with an introduction into the geology and metallogeny of Kyrgyzstan and provided a forum to discuss in the field academic as well as prospecting and exploration aspects of the geodynamic, magmatic and metallo-genic evolution of the Tien Shan.

Table of Contents top ↑

Paleozoic Geodynamics and Gold Deposits in the Altaids Sector of
Kyrgyzstan — Introduction,
by R. Seltmann, V. V. Shatov, A. Cole, S. Yakubchuk, and R. J. Jenchuraeva 1
Geological setting of orogenic gold mineralization 2
Granitoids and orogenic gold mineralization 4
Some terminology. Igneous link or missing link? 5
1. Geology and Evolution of the Tien Shan Lithosphere,
by A. B. Bakirov and R. A. Maksumova 7
1.1. Principal tectonic framework of the Tien Shan 7
1.2. Evolution of the Tien Shan lithosphere 7
2. Major Tectonic Units and Evolution of the Tien Shan Orogen,
by R. A. Maksumova, A. V. Jenchuraeva, and A. V Berezansky 17
3. Geology of the Northern and Middle Tien Shan: Principal Outlines, by K K Kiselev and R. A. Maksumova 21
3.1. Stratigraphy 21
3.2. Igneous rocks 27
4. Paleozoic Geodynamics, Magmatism, and Metallogeny
of the Tien Shan, by R. J. Jenchuraeva 29
4.1. Island paleoarcs of the Northern Tien Shan (Cambrian-Middle Ordovician) 29
4.2. Collision (Late Ordovician and Silurian) 35
4.3. Active continental margin of Andean type (Early Devonian-Middle Carboniferous) 39
4.4. Syncollision rifting (Late Carboniferous-Early Permian) 41
4.5. Intraplate stage (Late Permian-Early Triassic) 43
4.6. Concluding remarks on geodynamic and métallogénie evolution 48
4.7. Chemical composition of Variscan plutonic rocks in the Kyrgyz sector
of Tien Shan 49
5. Gold Mineralization in the Southern Tien Shan, Central Asia: Tectonic Setting Characteristics, Exploration Criteria,
by A. Cole 71
5.1. Geological setting 72
5.2. Geology of the Southern Tien Shan 74
5.3. Gold mineralization in the southern Tien Shan 76
5.4. Other gold-bearing systems 78
5.5. Exploration criteria 78
6. The Makmal Gold Deposit,
by R. J. Jenchuraeva, N. T. Pak, and I. A. Usmanov 82
6.1. Geology of the Makmal ore field 82
6.2. Geology of the Makmal deposit 85
6.3. Metasomatic alteration: typification, zoning, and mineral composition 85
6.4. Ore mineralization 90
6.5. Formation conditions of altered rocks 93
6.6. Geochemical haloes 94
6.7. A genetic model of the Makmal deposit 96
7. The Taldybulak Levoberezhny Gold Deposit,
by N. N. Malyukova 97
7.1. Geology of the ore field 97
7.2. Orebody morphology and ore types 99
7.3. Metasomatic alteration 103
7.4. Typomorphic features of pyrite 105
7.5. Typomorphic features of gold 107
7.6. Formation conditions109
8. The Boordu Zinc-Lead Deposit,
by I. A. Usmanov Ill
9. The Aktyuz Rare-Metal Ore Field,
by V. F. Kim, N. N. Malyukova, and L. Raimbault 115
9.1. Geology of the Aktyuz ore field 116
9.2. Ore mineralization 120
9.3. Outline of a model of the Aktyuz REE deposit 124
10. The Mironovskoe Copper-Bismuth-Gold Deposit,
by V. V. Shatov, R. Seltmann, and M. Rafailovich 129
10.1. Geology of the Mironovskoe ore field129
10.2. Hydrothermal alteration129
10.3. The Mironovskoe deposit132
11. The Kumtor Gold Deposit,
by R. J. Jenchuraeva, V. V. Nikonorov, and P. Litvinov 139
11.1. Geology of the Kumtor ore field 140
11.2. Geological setting of the Kumtor deposit 142
11.3. Fault tectonics 142
11.4. Ore zones 145
11.5. Hydrothermal alteration and ore mineralization 145
11.6. Ore mineralization 146
11.7. Formation conditions of the Kumtor deposit 150
12. The Jerooy Gold Deposit,
by R. J. Jenchuraeva and B. Oakes 153
12.1. Regional geological setting 153
12.2. Geology of the ore district 153
12.3. Geology of the Jerooy deposit 155
12.4. Ore zones 158
12.5. Mineral composition of ore 160
13. Selected Outcrops Representing the Geological Framework of the Au Mineralization in the Northern Tien Shan,
by R. J. Jenchuraeva 162
Stop 1: Akkulen syenite 162
Stop 2: Fragments of Devonian volcanogenic sequence in the western Transili Range 162
Stop 3: Early Paleozoic island-arc allochthone 163
Stop 4: Archean or Paleoproterozoic migmatites at the Semenov Bridge 163
Stop 5: Permian volcanics at the Red Bridge 164
Literature 165
Appendix 1: Gold Deposits of Kyrgyzstan 175
Appendix 2: Major Tectonic Units of the Tien Shan —
A Basic Scheme 180
Appendix 3: Geodynamic History of the Tien Shan 182