Rustam Mirkamalov - Academia.edu (original) (raw)

Papers by Rustam Mirkamalov

International Journal of Earth Sciences

The giant gold deposit Muruntau in most works belongs to the “orogenic type”. However, in the des... more The giant gold deposit Muruntau in most works belongs to the “orogenic type”. However, in the description of the geology of the deposit, there is usually no information about the stages (deformation, metamorphism) and the role of regional processes in the formation of host and mineralized rocks of the deposit. Our fieldwork provides unique geological evidence and previously unpublished data that are not reported in any other publications to date. This article presents the results of a detailed structural study of the terrane hosting the Muruntau gold deposit on the example of four sites and the results of deep drilling of two wells. The conducted studies confirm that the lowest Muruntau megaterrane consists of multi-stage metamorphosed Neoproterozoic–Early Paleozoic sedimentary-volcanic rocks and Late Paleozoic carbonate sediments overlain by Late Carboniferous flysch and olistostrome in the top. Two main stages (D1 and D2) of rock deformation in the lower part of the megaterrane as...

Precambrian Research, 2019

Paleogeographic reconstruction of the Cathaysia Block of South China and its link with orogeny as... more Paleogeographic reconstruction of the Cathaysia Block of South China and its link with orogeny associated with Rodinia and Gondwana remain enigmatic, leading to controversial models proposed for supercontinental configuration. This study presents detailed provenance analysis of late Neoproterozoic to early Paleozoic sedimentary successions from the Cathaysia Block, to trace the sedimentary provenance, that was essentially linked to previously adjacent continents/blocks. Zircon U-Pb dating combined with published paleontological evidence suggests an Ediacaran depositional age range (633-542 Ma) for the Lechangxia Group, while deposition of the Bacun Group most likely commenced during early Cambrian. The older strata were sourced mainly from recycling of quartz rich sedimentary rocks while the younger one received sediments dominantly from felsic igneous rocks. High SiO 2 contents (54.6-79.3 wt%) and K 2 O/Na 2 O ratios (0.69-35.7), detrital zircon age distribution and abundant monocrystalline quartz indicate a passive setting for Ediacaran and early Cambrian successions. In great contrast, the middle Cambrian strata was likely deposited in collisional setting, considering relatively lower SiO 2 contents (67.9-74.5 wt%) and K 2 O/Na 2 O ratios (0.97-1.63) plus absence of old zircons. This tectonic transition is consistent with the change from quartz arenite to arkose that could be related to a disconformity between early and middle Cambrian strata. Dominant late Mesoproterozoic detritus (1250-1050 Ma) in the Lechangxia Group was possibly sourced from older Grenville orogens (1300-1050 Ma) in western Australia and East Antarctica because rocks of these ages are rare in the Cathaysia Block. Similarly, abundant early Neoproterozoic clastic (1000-950 Ma) in the late Ediacaran and early Cambrian successions imply an increasing input from younger Grenville orogens (990-950 Ma) in East Antarctica and eastern India. Thus the Cathaysia Block was a part of the East Gondwana assembly and was linked to eastern India, East Antarctica and western Australia during Ediacaran and Cambrian. The source change was coeval with the Pinjarra Orogeny (550-520 Ma) and the early stage of the Kuunga Orogeny (570-550 Ma). In middle Cambrian strata, the middle Neoproterozoic sediments (850-700 Ma) were mainly derived from intrinsic sources, likely to be the Wuyishan terrane. This provenance variation can be linked to the middle Cambrian uplift of the Cathaysia Block in synchronous with the later phase of the Kuunga Orogeny (530-480 Ma).

Gondwana Research, 2018

The Uzbek western Tian Shan underwent three discrete periods of exhumation in the Mesozoic-Cenozo... more The Uzbek western Tian Shan underwent three discrete periods of exhumation in the Mesozoic-Cenozoic. In the Cretaceous, rapid exhumation is focused only in the core of relict suture zones or major faults. The Cretaceous Uzbek Tian Shan landscape developed as a series of parallel linear mountain belts.

Tectonics, 2018

The Chatkal-Kurama terrane represents a key region in understanding the tectonic evolution of the... more The Chatkal-Kurama terrane represents a key region in understanding the tectonic evolution of the western Tian Shan. In this contribution, we present new thermochronological data (apatite fission track and (U-Th-Sm)/He) and the associated thermal history models for 30 igneous samples from the Chatkal-Kurama terrane within Uzbekistan and Tajikistan (west of the Talas-Fergana fault), and integrate our data with published data from the western Tian Shan (east of the Talas Fergana fault). The Chatkal-Kurama terrane experienced a phase of rapid cooling during the Triassic-Jurassic at 225-190 Ma, which we interpret as a far-field response to the closure of the Palaeo-Asian Ocean or

International Journal of Earth Sciences

The giant gold deposit Muruntau in most works belongs to the “orogenic type”. However, in the des... more The giant gold deposit Muruntau in most works belongs to the “orogenic type”. However, in the description of the geology of the deposit, there is usually no information about the stages (deformation, metamorphism) and the role of regional processes in the formation of host and mineralized rocks of the deposit. Our fieldwork provides unique geological evidence and previously unpublished data that are not reported in any other publications to date. This article presents the results of a detailed structural study of the terrane hosting the Muruntau gold deposit on the example of four sites and the results of deep drilling of two wells. The conducted studies confirm that the lowest Muruntau megaterrane consists of multi-stage metamorphosed Neoproterozoic–Early Paleozoic sedimentary-volcanic rocks and Late Paleozoic carbonate sediments overlain by Late Carboniferous flysch and olistostrome in the top. Two main stages (D1 and D2) of rock deformation in the lower part of the megaterrane as...

Precambrian Research, 2019

Paleogeographic reconstruction of the Cathaysia Block of South China and its link with orogeny as... more Paleogeographic reconstruction of the Cathaysia Block of South China and its link with orogeny associated with Rodinia and Gondwana remain enigmatic, leading to controversial models proposed for supercontinental configuration. This study presents detailed provenance analysis of late Neoproterozoic to early Paleozoic sedimentary successions from the Cathaysia Block, to trace the sedimentary provenance, that was essentially linked to previously adjacent continents/blocks. Zircon U-Pb dating combined with published paleontological evidence suggests an Ediacaran depositional age range (633-542 Ma) for the Lechangxia Group, while deposition of the Bacun Group most likely commenced during early Cambrian. The older strata were sourced mainly from recycling of quartz rich sedimentary rocks while the younger one received sediments dominantly from felsic igneous rocks. High SiO 2 contents (54.6-79.3 wt%) and K 2 O/Na 2 O ratios (0.69-35.7), detrital zircon age distribution and abundant monocrystalline quartz indicate a passive setting for Ediacaran and early Cambrian successions. In great contrast, the middle Cambrian strata was likely deposited in collisional setting, considering relatively lower SiO 2 contents (67.9-74.5 wt%) and K 2 O/Na 2 O ratios (0.97-1.63) plus absence of old zircons. This tectonic transition is consistent with the change from quartz arenite to arkose that could be related to a disconformity between early and middle Cambrian strata. Dominant late Mesoproterozoic detritus (1250-1050 Ma) in the Lechangxia Group was possibly sourced from older Grenville orogens (1300-1050 Ma) in western Australia and East Antarctica because rocks of these ages are rare in the Cathaysia Block. Similarly, abundant early Neoproterozoic clastic (1000-950 Ma) in the late Ediacaran and early Cambrian successions imply an increasing input from younger Grenville orogens (990-950 Ma) in East Antarctica and eastern India. Thus the Cathaysia Block was a part of the East Gondwana assembly and was linked to eastern India, East Antarctica and western Australia during Ediacaran and Cambrian. The source change was coeval with the Pinjarra Orogeny (550-520 Ma) and the early stage of the Kuunga Orogeny (570-550 Ma). In middle Cambrian strata, the middle Neoproterozoic sediments (850-700 Ma) were mainly derived from intrinsic sources, likely to be the Wuyishan terrane. This provenance variation can be linked to the middle Cambrian uplift of the Cathaysia Block in synchronous with the later phase of the Kuunga Orogeny (530-480 Ma).

Gondwana Research, 2018

The Uzbek western Tian Shan underwent three discrete periods of exhumation in the Mesozoic-Cenozo... more The Uzbek western Tian Shan underwent three discrete periods of exhumation in the Mesozoic-Cenozoic. In the Cretaceous, rapid exhumation is focused only in the core of relict suture zones or major faults. The Cretaceous Uzbek Tian Shan landscape developed as a series of parallel linear mountain belts.

Tectonics, 2018

The Chatkal-Kurama terrane represents a key region in understanding the tectonic evolution of the... more The Chatkal-Kurama terrane represents a key region in understanding the tectonic evolution of the western Tian Shan. In this contribution, we present new thermochronological data (apatite fission track and (U-Th-Sm)/He) and the associated thermal history models for 30 igneous samples from the Chatkal-Kurama terrane within Uzbekistan and Tajikistan (west of the Talas-Fergana fault), and integrate our data with published data from the western Tian Shan (east of the Talas Fergana fault). The Chatkal-Kurama terrane experienced a phase of rapid cooling during the Triassic-Jurassic at 225-190 Ma, which we interpret as a far-field response to the closure of the Palaeo-Asian Ocean or